assertion in threaded tests

[ol-damirm]

I periodically see ci_assert(~lib_context->thread->sig.c.aflags & 0x4) when running sockapi-ts threaded tests:

[11052.805462] oo:ta_rpcs[502905]: Using Onload 76e6c7d6 2023-09-28 master  [0]
[11052.817875] oo:ta_rpcs[502905]: Copyright (c) 2002-2023 Advanced Micro Devices, Inc. 
[11116.701415] oo:ta_rpcs[502905]: FAIL at /tmp/onload/src/lib/transport/unix/internal.h:877
[11116.712517] oo:ta_rpcs[502905]: ci_assert(~lib_context->thread->sig.c.aflags & 0x4)
[11116.712517] from /tmp/onload/src/lib/transport/unix/internal.h:877
[11116.730047] oo:ta_rpcs[502905]: hostname=bofur pid=502905

Here is a list of affected tests from sapi-ts:

• sockapi-ts/basic/threaded_busy_socket
• sockapi-ts/basic/threaded_nblock_conn
• sockapi-ts/basic/threaded_udp

This can be reproduced, for example, using such a command line:

./run.sh -n --cfg=<hostname> --ool=no_reuse_pco --ool=onload \
--tester-run=sockapi-ts/basic/threaded_busy_socket:threads_num=10,sock_type=SOCK_DGRAM,env=VAR.env.peer2peer_tst,process=FALSE,func=recv,connect=TRUE,bind_iut=TRUE,wildcard=FALS

I cannot say it is regression or not.

kernel/OS: 5.15.0-86-generic #96~20.04.1-Ubuntu SMP Thu Sep 21 13:23:37 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
OpenOnload: 76e6c7d
cns-sapi-ts: 04c3e6c