test/msg_send_receive: fails on samr21-xpro

[BytesGalore]

Found during release 2016.07 testing RIOT-OS/Release-Specs#24 (comment)
The test fails on samr21-xpro board because of a wrong value present in msg_resp.content.ptr in the last iteration.
Printing the values of counter and msg_resp.content.ptr (resp val) for each iteration revealed:

# main(): This is RIOT! (Version: 2013.08-10643-gb5cb6-user01-LLED-E6410)
# Incremented counters to 1 and 1
# resp val: 1, counter: 1

... all ok until the last one:

# Incremented counters to 10 and 10
# resp val: 841, counter: 10
# Test failed.

[kYc0o]

any hint @kaspar030 ?

[OlegHahm]

Try to revert #5444

[BytesGalore]

@OlegHahm reverting #5444 didn't help

[OlegHahm]

Have you tested on other platforms?

[BytesGalore]

on native -> works, i.e. success

[kaspar030]

Looks to me like the threads are sending around pointers to their stacks, and in the last iteration, one of the threads already exited.

Could you try to add thread_sleep() before the return in thread2()?

[BytesGalore]

@kaspar030 that did it

[BytesGalore]

(I mean the test succeeds now)

[kaspar030]

I'll prepare a PR.

[BytesGalore]

nice

[kaspar030]

#5701