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native not float safe #495

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LudwigKnuepfer opened this issue Jan 13, 2014 · 12 comments
Open

native not float safe #495

LudwigKnuepfer opened this issue Jan 13, 2014 · 12 comments
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Area: cpu Area: CPU/MCU ports Platform: native Platform: This PR/issue effects the native platform Type: bug The issue reports a bug / The PR fixes a bug (including spelling errors)

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@LudwigKnuepfer
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When the FPU is used when an asynchronous context switch occurs, something goes wrong. Something (as far as quick testing could reveal): either the stack gets corrupted or a floating point exception occurs.

Test case: test_irq with a float instead of an int for the thread local variable (may need a few runs).

@mehlis
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mehlis commented Jan 17, 2014

just to collect all traces:

Core was generated by `../RIOT/examples/ccn-lite-client/bin/native/ccn-lite-client.elf grid5x5_c1 -t 4'.
Program terminated with signal 8, Arithmetic exception.
#0  0x4a127baf in vfprintf () from /lib/libc.so.6
Missing separate debuginfos, use: debuginfo-install glibc-2.17-20.fc19.i686
(gdb) bt
#0  0x4a127baf in vfprintf () from /lib/libc.so.6
#1  0x4a14e193 in vsnprintf () from /lib/libc.so.6
#2  0x0804a8fc in printf ()
#3  0x0805017f in thread_print_all ()
#4  0x0804f61c in handle_input_line ()
#5  0x0804f51f in shell_run ()
#6  0x0804ef4d in riot_ccn_runner ()
#7  0x0804ef83 in main ()

@LudwigKnuepfer LudwigKnuepfer removed this from the Release 2014.05 milestone Apr 28, 2014
@OlegHahm OlegHahm added this to the FIX ME FIRST milestone Jun 3, 2014
@kYc0o
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kYc0o commented Aug 4, 2016

Oups... little FIX ME FIRST which wasn't fixed... I'll try to look at it asap.

miri64 added a commit that referenced this issue Nov 11, 2016
RIOT-2016.10 - Release Notes
============================
RIOT is a real-time multi-threading operating system that supports a range of
devices that are typically found in the Internet of Things: 8-bit
microcontrollers, 16-bit microcontrollers and light-weight 32-bit processors.

RIOT is based on the following design principles: energy-efficiency, real-time
capabilities, small memory footprint, modularity, and uniform API access,
independent of the underlying hardware (this API offers partial POSIX
compliance).

RIOT is developed by an international open source community which is
independent of specific vendors (e.g. similarly to the Linux community) and is
licensed with a non-viral copyleft license (LGPLv2.1), which allows indirect
business models around the free open-source software platform provided by
RIOT.

About this release:
===================
This release provides a lot of new features as well as it  fixes several major
bugs. Among these new features are the new simplified network socket API
called sock, the GNRC specific CoAP implementation gcoap and several new
packages: TinyDTLS, the Aversive++ microcontroller library for robotics, the
u8g2 graphic library, and nanocoap.
Using the new sock API an implementation of the Simple Time Network Protocol
(SNTP) was also introduced, allowing for time synchronization between nodes.
New platforms include the Arduino Uno, the Arduino Duemilanove, the Arduino
Zero, SODAQ Autonomo, and the Zolertia remote (rev. B).
The most significant bug fix was done in native which led to a significantly
more robust handling of ISRs and now allows for at least 1,000 native
instances running stably on one machine.

About 263 pull requests with about 398 commits have been merged since the last
release and about 42 issues have been solved. 37 people contributed with code
in 100 days. 1006 files have been touched with 166500 insertions and 26926
deletions.

Notations used below:
=====================
+ means new feature/item
* means modified feature/item
- means removed feature/item

New features and changes
========================
General
-------
* Verbose behavior for assert() macro

Core
----
+ MPU support for Cortex-M

API changes
-----------
+ Socket-like sock API (replacing conn)
* netdev2: Add Testmodes and CCA modes
* IEEE 802.15.4: clean-up Intra-PAN behavior
* IEEE 802.15.4: centralize default values
* gnrc_pktbuf: allow for 0-sized snips
+ gnrc_netapi: mbox and arbitrary callback support

System libraries
----------------
No new features or changes

Networking
----------
+ Provide sock-port for GNRC
+ gcoap: a GNRC-based CoAP implementation
+ Simple Network Time Protocol (RFC 5905, section 14)
+ Priority Queue for packet snips
+ IPv4 header definitions

Packages
--------
+ nanocoap: CoAP header parser/builder
+ TinyDTLS: DTLS library
+ tiny-asn1: asn.1/der decoder
+ Aversive++ microcontroller programming library
+ u8g2 graphic library

Platforms
---------
+ Support for stm32f2xx MCU family
+ Low power modes for samd21 CPUs
+ More Arduino-based platforms:
    + Arduino Uno
    + Arduino Duemilanove
    + Arduino Zero
+ More boards of ST's Nucleo platforms:
    + ST Nucleo F030 board support
    + ST Nucleo F070 board support
    + ST Nucleo F446 board support
+ SODAQ Automono
+ Zolertia remote rev. B

Drivers
-------
+ W5100 Ethernet device
+ Atmel IO1 Xplained extension
+ LPD8808 LED strips
* at86rf2xx: provide capability to access the RND_VALUE random value register

Build System
------------
+ static-tests build target for easy local execution of CI's static tests

Other
-----
+ Provide Arduino API to Nucleo boards
+ Packer configuration file to build vagrant boxes
+ CC2650STK Debugger Support
+ ethos: add Ethos over TCP support

Fixed Issues from the last release
==================================
 #534:  native debugging on osx fails
 #2071: native: *long* overdue fixes
 #3341: netdev2_tap crashes when hammered
 #5007: gnrc icmpv6: Ping reply goes out the wrong interface
 #5432: native: valgrind fails

Known Issues
============
Networking related issues
-------------------------
 #3075: nhdp: unnecessary microsecond precision: NHDP works with timer values
       of microsecond precision which is not required. Changing to lower
       precision would save some memory.
 #4048: potential racey memory leak: According to the packet buffer stats,
       flood-pinging a multicast destination may lead to a memory leak due to
       a race condition. However, it seems to be a rare case and a completely
       filled up packet buffer was not observed.
 #4388: POSIX sockets: open socket is bound to a specific thread: This was an
       inherit problem of the conn API under GNRC. Since the POSIX sockets are
       still based on conn for this release, this issue persists
 #4527: gnrc_ipv6: Multicast is not forwarded if routing node listens to the
       address (might still be fixable for release, see #5729, #5230: gnrc
       ipv6: multicast packets are not dispatched to the upper layers)
 #5016: gnrc_rpl: Rejoining RPL instance as root after reboot messes up routing
 #5055: cpuid: multiple radios will get same EUI-64 Nodes with multiple
       interfaces might get the same EUI-64 for them since they are generated
       from the same CPU ID.
 #5656: Possible Weakness with locking in the GNRC network stack: For some
       operations mutexes to the network interfaces need to get unlocked in
       the current implementation to not get deadlocked. Recursive mutexes as
       provided in #5731 might help to solve this problem.
 #5748: gnrc: nodes crashing with too small packet buffer: A packet buffer of
       size ~512 B might lead to crashes. The issue describes this for several
       hundret nodes, but agressive flooding with just two nodes was also
       shown to lead to this problem.
 #5858: gnrc: 6lo: potential problem with reassembly of fragments: If one frame
       gets lost the reassembly state machine might get out of sync

 ### NDP is not working properly
 #4499: handle of l2src_len in gnrc_ndp_rtr_sol_handle: Reception of a router
       solicitation might lead to invalid zero-length link-layer addresses in
       neighbor cache.
 #5005: ndp: router advertisement sent with global address: Under some
       circumstances a router might send RAs with GUAs. While they are ignored
       on receive (as RFC 4861 specifies), RAs should have link-local
       addresses and not even be send out this way.
 #5122: NDP: global unicast address on non-6LBR nodes disappears after a while:
       Several issues (also see #5760) lead to a global unicast address
       effectively being banned from the network (disappears from neighbor
       cache, is not added again)
 #5467: ipv6 address vanishes when ARO (wrongly) indicates DUP caused by
       outdated ncache at router
 #5539: Border Router: packet not forwarded from ethos to interface 6
 #5790: ND: Lost of Global IPV6 on node after sending lot of UDP frame from BR

Timer related issues
--------------------
 #4841: xtimer: timer already in the list: Under some conditions an xtimer can
       end up twice in the internal list of the xtimer module
 #4902: xtimer: xtimer_set: xtimer_set does not handle integer overflows well
 #5338: xtimer: xtimer_now() not ISR safe for non-32-bit platforms.
 #5928: xtimer: usage in board_init() crashes: some boards use the xtimer in
       there board_init() function. The xtimer is however first initialized in
       the auto_init module which is executed after board_init()
 #6052: tests: xtimer_drift gets stuck: xtimer_drift application freezes after
       ~30-200 seconds

native related issues
---------------------
 #495:  native not float safe: When the FPU is used when an asynchronous context
       switch occurs, either the stack gets corrupted or a floating point
       exception occurs.
 #2175: ubjson: valgind registers "Invalid write of size 4" in unittests
 #4590: pkg: building relic with clang fails.
 #5796: native: tlsf: early malloc will lead to a crash: TLSF needs pools to be
       initialized (which is currently expected to be done in an application).
       If a malloc is needed before an application's main started (e.g. driver
       initialization) the node can crash, since no pool is allocated yet.

other platform related issues
-----------------------------
 #1891: newlib-nano: Printf formatting does not work properly for some numberic
       types: PRI[uxdi]64, PRI[uxdi]8 and float are not parsed in newlib-nano
 #2006: cpu/nrf51822: timer callback may be fired too early
 #2143: unittests: tests-core doesn't compile for all platforms: GCC build-ins
       were used in the unittests which are not available with msp430-gcc
 #2300: qemu unittest fails because of a page fault
 #4512: pkg: tests: RELIC unittests fail on iotlab-m3
 #4522: avsextrem: linker sometimes doesn't find `bl_init_clks()`
 #4560: make: clang is more pedantic than gcc oonf_api is not building with
       clang. (Partly solved by #4593)
 #4694: drivers/lm75a: does not build
 #4737: cortex-m: Hard fault after a thread exits (under some circumstances)
 #4822: kw2xrf: packet loss when packets get fragmented
 #4876: at86rf2xx: Simultaneous use of different transceiver types is not
       supported
 #4954: chronos: compiling with -O0 breaks
 #4866: not all GPIO driver implementations are thread safe: Due to non-atomic
       operations in the drivers some pin configurations might get lost.
 #5009: RIOT is saw-toothing in energy consumption (even when idling)
 #5103: xtimer: weird behavior of tests/xtimer_drift: xtimer_drift randomly
       jumps a few seconds on nrf52
 #5361: cpu/cc26x0: timer broken
 #5405: Eratic timings on iotlab-m3 with compression context activated
 #5460: cpu/samd21: i2c timing with compiler optimization
 #5486: at86rf2xx: lost interrupts
 #5489: cpu/lpc11u34: ADC broken
 #5603: atmega boards second UART issue
 #5678: at86rf2xx: failed assertion in _isr
 #5719: cc2538: rf driver doesn't handle large packets
 #5799: kw2x: 15.4 duplicate transmits
 #5944: msp430: ipv6_hdr unittests fail
 #5848: arduino: Race condition in sys/arduino/Makefile.include
 #5954: nRF52 uart_write get stuck
 #6018: nRF52 gnrc 6lowpan ble memory leak

other issues
------------
 #1263: TLSF implementation contains (a) read-before-write error(s).
 #3256: make: Setting constants on compile time doesn't really set them
       everywhere
 #3366: periph/i2c: handle NACK
 #4488: Making the newlib thread-safe: When calling puts/printf after
       thread_create(), the CPU hangs for DMA enabled uart drivers.
 #4866: periph: GPIO drivers are not thread safe
 #5128: make: buildtest breaks when exporting FEATURES_PROVIDED var
 #5207: make: buildest fails with board dependent application Makefiles
 #5390: pkg: OpenWSN does not compile: This package still uses deprecated
       modules and was not tested for a long time.
 #5520: tests/periph_uart not working
 #5561: C++11 extensions in header files
 #5776: make: Predefining CFLAGS are parsed weirdly
 #5863: OSX +  SAMR21-xpro: shell cannot handle command inputs larger than 64
       chars
 #5962: Makefile: UNDEF variable is not working as documented
 #6022: pkg: build order issue

Special Thanks
==============
We like to give our special thanks to all the companies that provided us with
their hardware for porting and testing, namely the people from (in
alphabeticalorder): Atmel, Freescale, Imagination Technologies, Limifrog,
Nordic, OpenMote, Phytec, SiLabs, UDOO,and Zolertia; and also companies that
directly sponsored development time: Cisco Systems, Eistec, Ell-i, Enigeering
Spirit, Nordic, FreshTemp LLC, OTAkeys and Phytec.

More information
================
http://www.riot-os.org

Mailing lists
-------------
* RIOT OS kernel developers list
  devel@riot-os.org (http://lists.riot-os.org/mailman/listinfo/devel)
* RIOT OS users list
  users@riot-os.org (http://lists.riot-os.org/mailman/listinfo/users)
* RIOT commits
  commits@riot-os.org (http://lists.riot-os.org/mailman/listinfo/commits)
* Github notifications
  notifications@riot-os.org (http://lists.riot-os.org/mailman/listinfo/notifications)

IRC
---
* Join the RIOT IRC channel at: irc.freenode.net, #riot-os

License
=======
* Most of the code developed by the RIOT community is licensed under the GNU
  Lesser General Public License (LGPL) version 2.1 as published by the Free
  Software Foundation.
* Some external sources are published under a separate, LGPL compatible
  license (e.g. some files developed by SICS).

All code files contain licensing information.
miri64 added a commit that referenced this issue Nov 11, 2016
RIOT-2016.10 - Release Notes
============================
RIOT is a real-time multi-threading operating system that supports a range of
devices that are typically found in the Internet of Things: 8-bit
microcontrollers, 16-bit microcontrollers and light-weight 32-bit processors.

RIOT is based on the following design principles: energy-efficiency, real-time
capabilities, small memory footprint, modularity, and uniform API access,
independent of the underlying hardware (this API offers partial POSIX
compliance).

RIOT is developed by an international open source community which is
independent of specific vendors (e.g. similarly to the Linux community) and is
licensed with a non-viral copyleft license (LGPLv2.1), which allows indirect
business models around the free open-source software platform provided by
RIOT.

About this release:
===================
This release provides a lot of new features as well as it  fixes several major
bugs. Among these new features are the new simplified network socket API
called sock, the GNRC specific CoAP implementation gcoap and several new
packages: TinyDTLS, the Aversive++ microcontroller library for robotics, the
u8g2 graphic library, and nanocoap.
Using the new sock API an implementation of the Simple Time Network Protocol
(SNTP) was also introduced, allowing for time synchronization between nodes.
New platforms include the Arduino Uno, the Arduino Duemilanove, the Arduino
Zero, SODAQ Autonomo, and the Zolertia remote (rev. B).
The most significant bug fix was done in native which led to a significantly
more robust handling of ISRs and now allows for at least 1,000 native
instances running stably on one machine.

About 263 pull requests with about 398 commits have been merged since the last
release and about 42 issues have been solved. 37 people contributed with code
in 100 days. 1006 files have been touched with 166500 insertions and 26926
deletions.

Notations used below:
=====================
+ means new feature/item
* means modified feature/item
- means removed feature/item

New features and changes
========================
General
-------
* Verbose behavior for assert() macro

Core
----
+ MPU support for Cortex-M

API changes
-----------
+ Socket-like sock API (replacing conn)
* netdev2: Add Testmodes and CCA modes
* IEEE 802.15.4: clean-up Intra-PAN behavior
* IEEE 802.15.4: centralize default values
* gnrc_pktbuf: allow for 0-sized snips
+ gnrc_netapi: mbox and arbitrary callback support

System libraries
----------------
No new features or changes

Networking
----------
+ Provide sock-port for GNRC
+ gcoap: a GNRC-based CoAP implementation
+ Simple Network Time Protocol (RFC 5905, section 14)
+ Priority Queue for packet snips
+ IPv4 header definitions

Packages
--------
+ nanocoap: CoAP header parser/builder
+ TinyDTLS: DTLS library
+ tiny-asn1: asn.1/der decoder
+ Aversive++ microcontroller programming library
+ u8g2 graphic library

Platforms
---------
+ Support for stm32f2xx MCU family
+ Low power modes for samd21 CPUs
+ More Arduino-based platforms:
    + Arduino Uno
    + Arduino Duemilanove
    + Arduino Zero
+ More boards of ST's Nucleo platforms:
    + ST Nucleo F030 board support
    + ST Nucleo F070 board support
    + ST Nucleo F446 board support
+ SODAQ Automono
+ Zolertia remote rev. B

Drivers
-------
+ W5100 Ethernet device
+ Atmel IO1 Xplained extension
+ LPD8808 LED strips
* at86rf2xx: provide capability to access the RND_VALUE random value register

Build System
------------
+ static-tests build target for easy local execution of CI's static tests

Other
-----
+ Provide Arduino API to Nucleo boards
+ Packer configuration file to build vagrant boxes
+ CC2650STK Debugger Support
+ ethos: add Ethos over TCP support

Fixed Issues from the last release
==================================
 #534:  native debugging on osx fails
 #2071: native: *long* overdue fixes
 #3341: netdev2_tap crashes when hammered
 #5007: gnrc icmpv6: Ping reply goes out the wrong interface
 #5432: native: valgrind fails

Known Issues
============
Networking related issues
-------------------------
 #3075: nhdp: unnecessary microsecond precision: NHDP works with timer values
       of microsecond precision which is not required. Changing to lower
       precision would save some memory.
 #4048: potential racey memory leak: According to the packet buffer stats,
       flood-pinging a multicast destination may lead to a memory leak due to
       a race condition. However, it seems to be a rare case and a completely
       filled up packet buffer was not observed.
 #4388: POSIX sockets: open socket is bound to a specific thread: This was an
       inherit problem of the conn API under GNRC. Since the POSIX sockets are
       still based on conn for this release, this issue persists
 #4527: gnrc_ipv6: Multicast is not forwarded if routing node listens to the
       address (might still be fixable for release, see #5729, #5230: gnrc
       ipv6: multicast packets are not dispatched to the upper layers)
 #5016: gnrc_rpl: Rejoining RPL instance as root after reboot messes up routing
 #5055: cpuid: multiple radios will get same EUI-64 Nodes with multiple
       interfaces might get the same EUI-64 for them since they are generated
       from the same CPU ID.
 #5656: Possible Weakness with locking in the GNRC network stack: For some
       operations mutexes to the network interfaces need to get unlocked in
       the current implementation to not get deadlocked. Recursive mutexes as
       provided in #5731 might help to solve this problem.
 #5748: gnrc: nodes crashing with too small packet buffer: A packet buffer of
       size ~512 B might lead to crashes. The issue describes this for several
       hundret nodes, but agressive flooding with just two nodes was also
       shown to lead to this problem.
 #5858: gnrc: 6lo: potential problem with reassembly of fragments: If one frame
       gets lost the reassembly state machine might get out of sync

 ### NDP is not working properly
 #4499: handle of l2src_len in gnrc_ndp_rtr_sol_handle: Reception of a router
       solicitation might lead to invalid zero-length link-layer addresses in
       neighbor cache.
 #5005: ndp: router advertisement sent with global address: Under some
       circumstances a router might send RAs with GUAs. While they are ignored
       on receive (as RFC 4861 specifies), RAs should have link-local
       addresses and not even be send out this way.
 #5122: NDP: global unicast address on non-6LBR nodes disappears after a while:
       Several issues (also see #5760) lead to a global unicast address
       effectively being banned from the network (disappears from neighbor
       cache, is not added again)
 #5467: ipv6 address vanishes when ARO (wrongly) indicates DUP caused by
       outdated ncache at router
 #5539: Border Router: packet not forwarded from ethos to interface 6
 #5790: ND: Lost of Global IPV6 on node after sending lot of UDP frame from BR

Timer related issues
--------------------
 #4841: xtimer: timer already in the list: Under some conditions an xtimer can
       end up twice in the internal list of the xtimer module
 #4902: xtimer: xtimer_set: xtimer_set does not handle integer overflows well
 #5338: xtimer: xtimer_now() not ISR safe for non-32-bit platforms.
 #5928: xtimer: usage in board_init() crashes: some boards use the xtimer in
       there board_init() function. The xtimer is however first initialized in
       the auto_init module which is executed after board_init()
 #6052: tests: xtimer_drift gets stuck: xtimer_drift application freezes after
       ~30-200 seconds

native related issues
---------------------
 #495:  native not float safe: When the FPU is used when an asynchronous context
       switch occurs, either the stack gets corrupted or a floating point
       exception occurs.
 #2175: ubjson: valgind registers "Invalid write of size 4" in unittests
 #4590: pkg: building relic with clang fails.
 #5796: native: tlsf: early malloc will lead to a crash: TLSF needs pools to be
       initialized (which is currently expected to be done in an application).
       If a malloc is needed before an application's main started (e.g. driver
       initialization) the node can crash, since no pool is allocated yet.

other platform related issues
-----------------------------
 #1891: newlib-nano: Printf formatting does not work properly for some numberic
       types: PRI[uxdi]64, PRI[uxdi]8 and float are not parsed in newlib-nano
 #2006: cpu/nrf51822: timer callback may be fired too early
 #2143: unittests: tests-core doesn't compile for all platforms: GCC build-ins
       were used in the unittests which are not available with msp430-gcc
 #2300: qemu unittest fails because of a page fault
 #4512: pkg: tests: RELIC unittests fail on iotlab-m3
 #4522: avsextrem: linker sometimes doesn't find `bl_init_clks()`
 #4560: make: clang is more pedantic than gcc oonf_api is not building with
       clang. (Partly solved by #4593)
 #4694: drivers/lm75a: does not build
 #4737: cortex-m: Hard fault after a thread exits (under some circumstances)
 #4822: kw2xrf: packet loss when packets get fragmented
 #4876: at86rf2xx: Simultaneous use of different transceiver types is not
       supported
 #4954: chronos: compiling with -O0 breaks
 #4866: not all GPIO driver implementations are thread safe: Due to non-atomic
       operations in the drivers some pin configurations might get lost.
 #5009: RIOT is saw-toothing in energy consumption (even when idling)
 #5103: xtimer: weird behavior of tests/xtimer_drift: xtimer_drift randomly
       jumps a few seconds on nrf52
 #5361: cpu/cc26x0: timer broken
 #5405: Eratic timings on iotlab-m3 with compression context activated
 #5460: cpu/samd21: i2c timing with compiler optimization
 #5486: at86rf2xx: lost interrupts
 #5489: cpu/lpc11u34: ADC broken
 #5603: atmega boards second UART issue
 #5678: at86rf2xx: failed assertion in _isr
 #5719: cc2538: rf driver doesn't handle large packets
 #5799: kw2x: 15.4 duplicate transmits
 #5944: msp430: ipv6_hdr unittests fail
 #5848: arduino: Race condition in sys/arduino/Makefile.include
 #5954: nRF52 uart_write get stuck
 #6018: nRF52 gnrc 6lowpan ble memory leak

other issues
------------
 #1263: TLSF implementation contains (a) read-before-write error(s).
 #3256: make: Setting constants on compile time doesn't really set them
       everywhere
 #3366: periph/i2c: handle NACK
 #4488: Making the newlib thread-safe: When calling puts/printf after
       thread_create(), the CPU hangs for DMA enabled uart drivers.
 #4866: periph: GPIO drivers are not thread safe
 #5128: make: buildtest breaks when exporting FEATURES_PROVIDED var
 #5207: make: buildest fails with board dependent application Makefiles
 #5390: pkg: OpenWSN does not compile: This package still uses deprecated
       modules and was not tested for a long time.
 #5520: tests/periph_uart not working
 #5561: C++11 extensions in header files
 #5776: make: Predefining CFLAGS are parsed weirdly
 #5863: OSX +  SAMR21-xpro: shell cannot handle command inputs larger than 64
       chars
 #5962: Makefile: UNDEF variable is not working as documented
 #6022: pkg: build order issue

Special Thanks
==============
We like to give our special thanks to all the companies that provided us with
their hardware for porting and testing, namely the people from (in
alphabeticalorder): Atmel, Freescale, Imagination Technologies, Limifrog,
Nordic, OpenMote, Phytec, SiLabs, UDOO,and Zolertia; and also companies that
directly sponsored development time: Cisco Systems, Eistec, Ell-i, Enigeering
Spirit, Nordic, FreshTemp LLC, OTAkeys and Phytec.

More information
================
http://www.riot-os.org

Mailing lists
-------------
* RIOT OS kernel developers list
  devel@riot-os.org (http://lists.riot-os.org/mailman/listinfo/devel)
* RIOT OS users list
  users@riot-os.org (http://lists.riot-os.org/mailman/listinfo/users)
* RIOT commits
  commits@riot-os.org (http://lists.riot-os.org/mailman/listinfo/commits)
* Github notifications
  notifications@riot-os.org (http://lists.riot-os.org/mailman/listinfo/notifications)

IRC
---
* Join the RIOT IRC channel at: irc.freenode.net, #riot-os

License
=======
* Most of the code developed by the RIOT community is licensed under the GNU
  Lesser General Public License (LGPL) version 2.1 as published by the Free
  Software Foundation.
* Some external sources are published under a separate, LGPL compatible
  license (e.g. some files developed by SICS).

All code files contain licensing information.
neiljay pushed a commit to neiljay/RIOT that referenced this issue Jan 16, 2017
RIOT-2016.10 - Release Notes
============================
RIOT is a real-time multi-threading operating system that supports a range of
devices that are typically found in the Internet of Things: 8-bit
microcontrollers, 16-bit microcontrollers and light-weight 32-bit processors.

RIOT is based on the following design principles: energy-efficiency, real-time
capabilities, small memory footprint, modularity, and uniform API access,
independent of the underlying hardware (this API offers partial POSIX
compliance).

RIOT is developed by an international open source community which is
independent of specific vendors (e.g. similarly to the Linux community) and is
licensed with a non-viral copyleft license (LGPLv2.1), which allows indirect
business models around the free open-source software platform provided by
RIOT.

About this release:
===================
This release provides a lot of new features as well as it  fixes several major
bugs. Among these new features are the new simplified network socket API
called sock, the GNRC specific CoAP implementation gcoap and several new
packages: TinyDTLS, the Aversive++ microcontroller library for robotics, the
u8g2 graphic library, and nanocoap.
Using the new sock API an implementation of the Simple Time Network Protocol
(SNTP) was also introduced, allowing for time synchronization between nodes.
New platforms include the Arduino Uno, the Arduino Duemilanove, the Arduino
Zero, SODAQ Autonomo, and the Zolertia remote (rev. B).
The most significant bug fix was done in native which led to a significantly
more robust handling of ISRs and now allows for at least 1,000 native
instances running stably on one machine.

About 263 pull requests with about 398 commits have been merged since the last
release and about 42 issues have been solved. 37 people contributed with code
in 100 days. 1006 files have been touched with 166500 insertions and 26926
deletions.

Notations used below:
=====================
+ means new feature/item
* means modified feature/item
- means removed feature/item

New features and changes
========================
General
-------
* Verbose behavior for assert() macro

Core
----
+ MPU support for Cortex-M

API changes
-----------
+ Socket-like sock API (replacing conn)
* netdev2: Add Testmodes and CCA modes
* IEEE 802.15.4: clean-up Intra-PAN behavior
* IEEE 802.15.4: centralize default values
* gnrc_pktbuf: allow for 0-sized snips
+ gnrc_netapi: mbox and arbitrary callback support

System libraries
----------------
No new features or changes

Networking
----------
+ Provide sock-port for GNRC
+ gcoap: a GNRC-based CoAP implementation
+ Simple Network Time Protocol (RFC 5905, section 14)
+ Priority Queue for packet snips
+ IPv4 header definitions

Packages
--------
+ nanocoap: CoAP header parser/builder
+ TinyDTLS: DTLS library
+ tiny-asn1: asn.1/der decoder
+ Aversive++ microcontroller programming library
+ u8g2 graphic library

Platforms
---------
+ Support for stm32f2xx MCU family
+ Low power modes for samd21 CPUs
+ More Arduino-based platforms:
    + Arduino Uno
    + Arduino Duemilanove
    + Arduino Zero
+ More boards of ST's Nucleo platforms:
    + ST Nucleo F030 board support
    + ST Nucleo F070 board support
    + ST Nucleo F446 board support
+ SODAQ Automono
+ Zolertia remote rev. B

Drivers
-------
+ W5100 Ethernet device
+ Atmel IO1 Xplained extension
+ LPD8808 LED strips
* at86rf2xx: provide capability to access the RND_VALUE random value register

Build System
------------
+ static-tests build target for easy local execution of CI's static tests

Other
-----
+ Provide Arduino API to Nucleo boards
+ Packer configuration file to build vagrant boxes
+ CC2650STK Debugger Support
+ ethos: add Ethos over TCP support

Fixed Issues from the last release
==================================
 RIOT-OS#534:  native debugging on osx fails
 RIOT-OS#2071: native: *long* overdue fixes
 RIOT-OS#3341: netdev2_tap crashes when hammered
 RIOT-OS#5007: gnrc icmpv6: Ping reply goes out the wrong interface
 RIOT-OS#5432: native: valgrind fails

Known Issues
============
Networking related issues
-------------------------
 RIOT-OS#3075: nhdp: unnecessary microsecond precision: NHDP works with timer values
       of microsecond precision which is not required. Changing to lower
       precision would save some memory.
 RIOT-OS#4048: potential racey memory leak: According to the packet buffer stats,
       flood-pinging a multicast destination may lead to a memory leak due to
       a race condition. However, it seems to be a rare case and a completely
       filled up packet buffer was not observed.
 RIOT-OS#4388: POSIX sockets: open socket is bound to a specific thread: This was an
       inherit problem of the conn API under GNRC. Since the POSIX sockets are
       still based on conn for this release, this issue persists
 RIOT-OS#4527: gnrc_ipv6: Multicast is not forwarded if routing node listens to the
       address (might still be fixable for release, see RIOT-OS#5729, RIOT-OS#5230: gnrc
       ipv6: multicast packets are not dispatched to the upper layers)
 RIOT-OS#5016: gnrc_rpl: Rejoining RPL instance as root after reboot messes up routing
 RIOT-OS#5055: cpuid: multiple radios will get same EUI-64 Nodes with multiple
       interfaces might get the same EUI-64 for them since they are generated
       from the same CPU ID.
 RIOT-OS#5656: Possible Weakness with locking in the GNRC network stack: For some
       operations mutexes to the network interfaces need to get unlocked in
       the current implementation to not get deadlocked. Recursive mutexes as
       provided in RIOT-OS#5731 might help to solve this problem.
 RIOT-OS#5748: gnrc: nodes crashing with too small packet buffer: A packet buffer of
       size ~512 B might lead to crashes. The issue describes this for several
       hundret nodes, but agressive flooding with just two nodes was also
       shown to lead to this problem.
 RIOT-OS#5858: gnrc: 6lo: potential problem with reassembly of fragments: If one frame
       gets lost the reassembly state machine might get out of sync

 ### NDP is not working properly
 RIOT-OS#4499: handle of l2src_len in gnrc_ndp_rtr_sol_handle: Reception of a router
       solicitation might lead to invalid zero-length link-layer addresses in
       neighbor cache.
 RIOT-OS#5005: ndp: router advertisement sent with global address: Under some
       circumstances a router might send RAs with GUAs. While they are ignored
       on receive (as RFC 4861 specifies), RAs should have link-local
       addresses and not even be send out this way.
 RIOT-OS#5122: NDP: global unicast address on non-6LBR nodes disappears after a while:
       Several issues (also see RIOT-OS#5760) lead to a global unicast address
       effectively being banned from the network (disappears from neighbor
       cache, is not added again)
 RIOT-OS#5467: ipv6 address vanishes when ARO (wrongly) indicates DUP caused by
       outdated ncache at router
 RIOT-OS#5539: Border Router: packet not forwarded from ethos to interface 6
 RIOT-OS#5790: ND: Lost of Global IPV6 on node after sending lot of UDP frame from BR

Timer related issues
--------------------
 RIOT-OS#4841: xtimer: timer already in the list: Under some conditions an xtimer can
       end up twice in the internal list of the xtimer module
 RIOT-OS#4902: xtimer: xtimer_set: xtimer_set does not handle integer overflows well
 RIOT-OS#5338: xtimer: xtimer_now() not ISR safe for non-32-bit platforms.
 RIOT-OS#5928: xtimer: usage in board_init() crashes: some boards use the xtimer in
       there board_init() function. The xtimer is however first initialized in
       the auto_init module which is executed after board_init()
 RIOT-OS#6052: tests: xtimer_drift gets stuck: xtimer_drift application freezes after
       ~30-200 seconds

native related issues
---------------------
 RIOT-OS#495:  native not float safe: When the FPU is used when an asynchronous context
       switch occurs, either the stack gets corrupted or a floating point
       exception occurs.
 RIOT-OS#2175: ubjson: valgind registers "Invalid write of size 4" in unittests
 RIOT-OS#4590: pkg: building relic with clang fails.
 RIOT-OS#5796: native: tlsf: early malloc will lead to a crash: TLSF needs pools to be
       initialized (which is currently expected to be done in an application).
       If a malloc is needed before an application's main started (e.g. driver
       initialization) the node can crash, since no pool is allocated yet.

other platform related issues
-----------------------------
 RIOT-OS#1891: newlib-nano: Printf formatting does not work properly for some numberic
       types: PRI[uxdi]64, PRI[uxdi]8 and float are not parsed in newlib-nano
 RIOT-OS#2006: cpu/nrf51822: timer callback may be fired too early
 RIOT-OS#2143: unittests: tests-core doesn't compile for all platforms: GCC build-ins
       were used in the unittests which are not available with msp430-gcc
 RIOT-OS#2300: qemu unittest fails because of a page fault
 RIOT-OS#4512: pkg: tests: RELIC unittests fail on iotlab-m3
 RIOT-OS#4522: avsextrem: linker sometimes doesn't find `bl_init_clks()`
 RIOT-OS#4560: make: clang is more pedantic than gcc oonf_api is not building with
       clang. (Partly solved by RIOT-OS#4593)
 RIOT-OS#4694: drivers/lm75a: does not build
 RIOT-OS#4737: cortex-m: Hard fault after a thread exits (under some circumstances)
 RIOT-OS#4822: kw2xrf: packet loss when packets get fragmented
 RIOT-OS#4876: at86rf2xx: Simultaneous use of different transceiver types is not
       supported
 RIOT-OS#4954: chronos: compiling with -O0 breaks
 RIOT-OS#4866: not all GPIO driver implementations are thread safe: Due to non-atomic
       operations in the drivers some pin configurations might get lost.
 RIOT-OS#5009: RIOT is saw-toothing in energy consumption (even when idling)
 RIOT-OS#5103: xtimer: weird behavior of tests/xtimer_drift: xtimer_drift randomly
       jumps a few seconds on nrf52
 RIOT-OS#5361: cpu/cc26x0: timer broken
 RIOT-OS#5405: Eratic timings on iotlab-m3 with compression context activated
 RIOT-OS#5460: cpu/samd21: i2c timing with compiler optimization
 RIOT-OS#5486: at86rf2xx: lost interrupts
 RIOT-OS#5489: cpu/lpc11u34: ADC broken
 RIOT-OS#5603: atmega boards second UART issue
 RIOT-OS#5678: at86rf2xx: failed assertion in _isr
 RIOT-OS#5719: cc2538: rf driver doesn't handle large packets
 RIOT-OS#5799: kw2x: 15.4 duplicate transmits
 RIOT-OS#5944: msp430: ipv6_hdr unittests fail
 RIOT-OS#5848: arduino: Race condition in sys/arduino/Makefile.include
 RIOT-OS#5954: nRF52 uart_write get stuck
 RIOT-OS#6018: nRF52 gnrc 6lowpan ble memory leak

other issues
------------
 RIOT-OS#1263: TLSF implementation contains (a) read-before-write error(s).
 RIOT-OS#3256: make: Setting constants on compile time doesn't really set them
       everywhere
 RIOT-OS#3366: periph/i2c: handle NACK
 RIOT-OS#4488: Making the newlib thread-safe: When calling puts/printf after
       thread_create(), the CPU hangs for DMA enabled uart drivers.
 RIOT-OS#4866: periph: GPIO drivers are not thread safe
 RIOT-OS#5128: make: buildtest breaks when exporting FEATURES_PROVIDED var
 RIOT-OS#5207: make: buildest fails with board dependent application Makefiles
 RIOT-OS#5390: pkg: OpenWSN does not compile: This package still uses deprecated
       modules and was not tested for a long time.
 RIOT-OS#5520: tests/periph_uart not working
 RIOT-OS#5561: C++11 extensions in header files
 RIOT-OS#5776: make: Predefining CFLAGS are parsed weirdly
 RIOT-OS#5863: OSX +  SAMR21-xpro: shell cannot handle command inputs larger than 64
       chars
 RIOT-OS#5962: Makefile: UNDEF variable is not working as documented
 RIOT-OS#6022: pkg: build order issue

Special Thanks
==============
We like to give our special thanks to all the companies that provided us with
their hardware for porting and testing, namely the people from (in
alphabeticalorder): Atmel, Freescale, Imagination Technologies, Limifrog,
Nordic, OpenMote, Phytec, SiLabs, UDOO,and Zolertia; and also companies that
directly sponsored development time: Cisco Systems, Eistec, Ell-i, Enigeering
Spirit, Nordic, FreshTemp LLC, OTAkeys and Phytec.

More information
================
http://www.riot-os.org

Mailing lists
-------------
* RIOT OS kernel developers list
  devel@riot-os.org (http://lists.riot-os.org/mailman/listinfo/devel)
* RIOT OS users list
  users@riot-os.org (http://lists.riot-os.org/mailman/listinfo/users)
* RIOT commits
  commits@riot-os.org (http://lists.riot-os.org/mailman/listinfo/commits)
* Github notifications
  notifications@riot-os.org (http://lists.riot-os.org/mailman/listinfo/notifications)

IRC
---
* Join the RIOT IRC channel at: irc.freenode.net, #riot-os

License
=======
* Most of the code developed by the RIOT community is licensed under the GNU
  Lesser General Public License (LGPL) version 2.1 as published by the Free
  Software Foundation.
* Some external sources are published under a separate, LGPL compatible
  license (e.g. some files developed by SICS).

All code files contain licensing information.
@kaspar030 kaspar030 removed this from the FIX ME FIRST milestone Oct 24, 2017
@kYc0o
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kYc0o commented Jul 17, 2018

I'd say this is a won't fix and we close the issue. Anyone against?

@miri64
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miri64 commented Jul 17, 2018

I'm against closing this one, as this is fixable (it just takes some heavy investigating). Just closing it with wontfix is a very lazy way of dealing with actual problems ;-).

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stale bot commented Aug 10, 2019

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you want me to ignore this issue, please mark it with the "State: don't stale" label. Thank you for your contributions.

@stale stale bot added the State: stale State: The issue / PR has no activity for >185 days label Aug 10, 2019
@stale stale bot closed this as completed Sep 10, 2019
@miri64 miri64 added the State: don't stale State: Tell state-bot to ignore this issue label Sep 10, 2019
@miri64
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miri64 commented Sep 10, 2019

See #495 (comment) and also #11921 (comment) ;-)

@miri64 miri64 reopened this Sep 10, 2019
@stale stale bot removed the State: stale State: The issue / PR has no activity for >185 days label Sep 10, 2019
@aabadie aabadie removed the State: don't stale State: Tell state-bot to ignore this issue label Oct 8, 2019
@miri64 miri64 added this to the Release 2020.07 milestone Jun 30, 2020
@leandrolanzieri
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I was about to open an issue when I saw this. On current master (e768a85) tests/thread_floathttps://github.com/RIOT-OS/RIOT/tree/master/tests/thread_float raises a floating point exception. I'm thinking this is the underlying issue experienced in #15870 and #15878.

My versions:

Operating System Environment
----------------------------
         Operating System: "Manjaro Linux" 
                   Kernel: Linux 5.10.19-1-MANJARO x86_64 unknown
             System shell: GNU bash, version 5.1.0(1)-release (x86_64-pc-linux-gnu)
             make's shell: GNU bash, version 5.1.0(1)-release (x86_64-pc-linux-gnu)

Installed compiler toolchains
-----------------------------
               native gcc: gcc (GCC) 10.2.0
        arm-none-eabi-gcc: arm-none-eabi-gcc (Arch Repository) 10.2.0
                  avr-gcc: missing
         mips-mti-elf-gcc: missing
           msp430-elf-gcc: missing
       riscv-none-elf-gcc: missing
  riscv64-unknown-elf-gcc: missing
     riscv-none-embed-gcc: missing
     xtensa-esp32-elf-gcc: missing
   xtensa-esp8266-elf-gcc: missing
                    clang: clang version 11.1.0

Installed compiler libs
-----------------------
     arm-none-eabi-newlib: "4.1.0"
      mips-mti-elf-newlib: missing
        msp430-elf-newlib: missing
    riscv-none-elf-newlib: missing
riscv64-unknown-elf-newlib: missing
  riscv-none-embed-newlib: missing
  xtensa-esp32-elf-newlib: missing
xtensa-esp8266-elf-newlib: missing
                 avr-libc: missing (missing)

Installed development tools
---------------------------
                   ccache: ccache version 4.2
                    cmake: cmake version 3.19.6
                 cppcheck: missing
                  doxygen: 1.9.1
                      git: git version 2.30.1
                     make: GNU Make 4.3
                  openocd: Open On-Chip Debugger 0.10.0
                   python: Python 3.9.2
                  python2: missing
                  python3: Python 3.9.2
                   flake8: error: /usr/bin/python3: No module named flake8
               coccinelle: missing

@jia200x
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jia200x commented Sep 22, 2022

I think I finally found what's going on with the corrupted FPU registers on native (I'm printing the ftag before every function call):

Found trace frame 29, tracepoint 2
$162 = "setcontext"
$163 = 0xffff
Found trace frame 30, tracepoint 5
$164 = "native_isr_entry"
$165 = 0xffff
Found trace frame 31, tracepoint 1
$166 = "makecontext"
$167 = 0xffff
Found trace frame 32, tracepoint 6
$168 = void
$169 = 0x1555                      <-- _native_sig_leave_tramp
Found trace frame 33, tracepoint 4
$170 = "swapcontext"
$171 = 0x1555                      <-- This `swapcontext` saves corrupted FPU state
Found trace frame 34, tracepoint 7
$172 = "native_irq_handler"
$173 = 0xffff
Found trace frame 35, tracepoint 2
$174 = "setcontext"
$175 = 0xffff
Found trace frame 36, tracepoint 1
$176 = "makecontext"
$177 = 0xffff
Found trace frame 37, tracepoint 4
$178 = "swapcontext"
$179 = 0xffff

AFAIU although the Linux Kernel avoids doing FPU operations, it might still perform some. In any case, the Kernel does not care about user space FPU states.
On a "real" native IRQ (not the "RIOT" one we artificially create with makecontext), the native process will call a trampoline function (_native_sig_leave_tramp) to invoke the "RIOT" ISR (native_handle_irq). At the begininng of _native_sig_leave_tramp, the FPU regs are already corrupted because the kernel does not restore user space context. But for whatever reason we call swapcontext there, which successfully copies the corrupted FPU state into one of the thread stacks. At some point, setcontext or swapcontext will set the FPU register in a wrong state, which will eventually raise SIGFPE.

IMO the solution is to use setcontext instead of swapcontext in the trampoline function. But this would require to keep the state of the last thread somewhere.

@kaspar030
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MO the solution is to use setcontext instead of swapcontext in the trampoline function. But this would require to keep the state of the last thread somewhere.

is there any point in the signal handling where the old context hasn't been corrupted, and can be stored?

@jia200x
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jia200x commented Sep 22, 2022

is there any point in the signal handling where the old context hasn't been corrupted, and can be stored?

The corruption takes place between the end of the signal handler (_native_isr_entry) and the beginning of the trampoline function (_native_sig_leave_tramp).

Probably calling getcontext in the signal handler and setcontext in the trampoline should do the trick.

@jia200x
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jia200x commented Sep 22, 2022

hmmmm digging deeper into the topic, it seems the context arg of the signal handler stores the last valid FPU register state. In this patch they set the FP regs manually from uc_mcontext. Maybe that's the way to go.

@benpicco
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benpicco commented Dec 6, 2022

In this patch they set the FP regs manually from uc_mcontext.

I think I need more context - how will the LoongArch UAPI help us here?
Or do you suggest that this is indeed a bug in the Linux x86 UAPI and the kernel needs to be fixed here?

gdoffe added a commit to cogip/mcu-firmware that referenced this issue Mar 29, 2023
From cqfd README:
  cqfd provides a quick and convenient way to run commands in the
  current directory, but within a Docker container defined in a per-
  project config file.

Since Ubuntu 21.04, a bug[1] appeared leading to a lot of SIGFPE signals
killing the application when running on native architecture.
This bug is hard to solve and even to investigate. To solve this, use
cqfd to build and run the native app_test application in an Ubuntu 20.04
docker container based image.

Follow README for instructions.

[1]: RIOT-OS/RIOT#495 (comment)

Signed-off-by: Gilles DOFFE <g.doffe@gmail.com>
gdoffe added a commit to cogip/mcu-firmware that referenced this issue Mar 29, 2023
From cqfd README:
  cqfd provides a quick and convenient way to run commands in the
  current directory, but within a Docker container defined in a per-
  project config file.

Since Ubuntu 21.04, a bug[1] appeared leading to a lot of SIGFPE signals
killing the application when running on native architecture.
This bug is hard to solve and even to investigate. To solve this, use
cqfd to build and run the native app_test application in an Ubuntu 20.04
docker container based image.

Follow README for instructions.

[1]: RIOT-OS/RIOT#495 (comment)

Signed-off-by: Gilles DOFFE <g.doffe@gmail.com>
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