V run / REPL fails with "signal 11: segmentation fault" for basic examples/hello_world.v program

[rmgas1]

Describe the bug

Basic program fails with "signal 11: segmentation fault" when executed via 'v run' or via 'REPL'.

Quickest way to reproduce it is to call print* functions, e.g.: examples/hello_world.v

It looks like it is attempting to write to memory that has not been allocated to the process for writing (for example, when array bounds are exceeded).

1. Update V et al:

$> v up
Updating V...
V is already updated.
Current V version: V 0.4.3 0b12d64, timestamp: 2023-12-13 22:32:52 +0200
$> v outdated
Modules are up to date.
$> v install
Detected v.mod file inside the project directory. Using it...
Nothing to install.
$> 

2. Segmentation fault on 'v run examples/hello_world.v':

$>  ls examples/hello_world*
examples/hello_world.v
$>  cat examples/hello_world.v
println('Hello, World!')
$>  v run examples/hello_world.v
signal 11: segmentation fault
0   libsystem_platform.dylib            0x00007ff8081085ed _sigtramp + 29
1   ???                                 0x0000000000000000 0x0 + 0
2   v                                   0x000000010c25251b os__Process__spawn + 155
3   v                                   0x000000010c252443 os__Process_wait + 35
4   v                                   0x000000010c580d85 v__builder__Builder_run_compiled_executable_and_exit + 3701
5   v                                   0x000000010c57e55c v__builder__compile + 124
6   v                                   0x000000010c589ff9 main__rebuild + 121
7   v                                   0x000000010c589205 main__main + 2181
8   v                                   0x000000010c58eb10 main + 64
9   dyld                                0x00007ff807d8141f start + 1903
$>

3. Compiled version works:

$> ls examples/hello_world*
examples/hello_world*   examples/hello_world.v
$>  ./examples/hello_world
Hello, World!
$>

4. Segmentation fault on REPL equivalent:

$> v
 ____    ____
 \   \  /   /  |  Welcome to the V REPL (for help with V itself, type  exit , then run  v help ).
  \   \/   /   |  Note: the REPL is highly experimental. For best V experience, use a text editor,
   \      /    |  save your code in a  main.v  file and execute:  v run main.v
    \    /     |  V 0.4.3 0b12d64 . Use  list  to see the accumulated program so far.
     \__/      |  Use Ctrl-C or  exit  to exit, or  help  to see other available commands.

>>> print('test')
signal 11: segmentation fault
0   libsystem_platform.dylib            0x00007ff8081085ed _sigtramp + 29
1   ???                                 0x0000000000000000 0x0 + 0
2   v                                   0x000000010ab1151b os__Process__spawn + 155
3   v                                   0x000000010ab11443 os__Process_wait + 35
4   v                                   0x000000010ae3fd85 v__builder__Builder_run_compiled_executable_and_exit + 3701
5   v                                   0x000000010ae3d55c v__builder__compile + 124
6   v                                   0x000000010ae48ff9 main__rebuild + 121
7   v                                   0x000000010ae48205 main__main + 2181
8   v                                   0x000000010ae4db10 main + 64
9   dyld                                0x00007ff807d8141f start + 1903
>>> println('test')
signal 11: segmentation fault
0   libsystem_platform.dylib            0x00007ff8081085ed _sigtramp + 29
1   ???                                 0x0000000000000000 0x0 + 0
2   v                                   0x00000001016bd51b os__Process__spawn + 155
3   v                                   0x00000001016bd443 os__Process_wait + 35
4   v                                   0x00000001019ebd85 v__builder__Builder_run_compiled_executable_and_exit + 3701
5   v                                   0x00000001019e955c v__builder__compile + 124
6   v                                   0x00000001019f4ff9 main__rebuild + 121
7   v                                   0x00000001019f4205 main__main + 2181
8   v                                   0x00000001019f9b10 main + 64
9   dyld                                0x00007ff807d8141f start + 1903
>>> exit
$> 

Reproduction Steps

Run the following In V directory:

v up
v outdated
v install
ls examples/hello_world*
cat examples/hello_world.v
v run examples/hello_world.v
ls examples/hello_world*
./examples/hello_world

In v REPL:

print('test')
println('test')

Expected Behavior

Expected v run to execute code without an error.
Expected v REPL to execute code without an error.

Current Behavior

Segmentation fault in both cases.

Possible Solution

No response

Additional Information/Context

No response

V version

Current V version: V 0.4.3 0b12d64, timestamp: 2023-12-13 22:32:52 +0200

Environment details (OS name and version, etc.)

$> v doctor
V full version: V 0.4.3 0b12d64
OS: macos, macOS, 13.5.2, 22G91
Processor: 16 cpus, 64bit, little endian, Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz

getwd: /Users/USER/PATH/v/v
vexe: /Users/USER/PATH/v/v/v
vexe mtime: 2023-12-14 00:57:32

vroot: OK, value: /Users/USER/PATH/v/v
VMODULES: OK, value: /Users/USER/.vmodules
VTMP: OK, value: /tmp/v_502

Git version: git version 2.43.0
Git vroot status: weekly.2023.50-22-g0b12d647-dirty
.git/config present: true

CC version: Apple clang version 15.0.0 (clang-1500.1.0.2.5)
thirdparty/tcc status: thirdparty-macos-amd64 46662e20
$>

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[JalonSolov]

Try export VFLAGS='-use-os-system-to-run' then try the v run command again.

[rmgas1]

Try export VFLAGS='-use-os-system-to-run' then try the v run command again.

Yes. This setting does address this issue, and both 'v run' and REPL work ok.

Is there a way make this the default setting for v on MacOS (outside of setting it in the user's profile)?

[shove70]

Try export VFLAGS='-use-os-system-to-run' then try the v run command again.

Yes. This setting does address this issue, and both 'v run' and REPL work ok.

Is there a way make this the default setting for v on MacOS (outside of setting it in the user's profile)?

Refer to:
#19384

[rmgas1]

Refer to: #19384

Thanks for your help. No permanent solution yet, but as it is being managed under that issue, I'll close this one.