[BUG] Unable to run unittests: catch_assert(configASSERT(0)) = SIGABRT

[anordal]

I used to be able to run the unittests, but now, a lot of them are dying of SIGABRT:

The following tests FAILED:
	  1 - FreeRTOS_ARP_utest (Subprocess aborted)
	  4 - FreeRTOS_DHCP_utest (Subprocess aborted)
	  5 - FreeRTOS_DHCPv6_utest (Subprocess aborted)
	  6 - FreeRTOS_TCP_WIN_utest (Subprocess aborted)
	  8 - FreeRTOS_DNS_utest (Subprocess aborted)
	 13 - FreeRTOS_DNS_Parser_utest (Subprocess aborted)
	 14 - FreeRTOS_IP_utest (Subprocess aborted)
	 21 - FreeRTOS_IP_Utils_utest (Subprocess aborted)
	 24 - FreeRTOS_IPv6_Utils_utest (Subprocess aborted)
	 30 - FreeRTOS_ND_utest (Subprocess aborted)
	 31 - FreeRTOS_Sockets_GenericAPI_utest (Subprocess aborted)
	 33 - FreeRTOS_Sockets_UDP_API_utest (Subprocess aborted)
	 34 - FreeRTOS_Sockets_privates_utest (Subprocess aborted)
	 39 - FreeRTOS_Sockets_DiffConfig1_privates_utest (Subprocess aborted)
	 41 - FreeRTOS_RA_utest (Subprocess aborted)
	 42 - FreeRTOS_UDP_IP_utest (Subprocess aborted)
	 43 - FreeRTOS_UDP_IPv4_utest (Subprocess aborted)
	 44 - FreeRTOS_UDP_IPv6_utest (Subprocess aborted)
	 46 - FreeRTOS_TCP_IP_utest (Subprocess aborted)
	 51 - FreeRTOS_TCP_Transmission_utest (Subprocess aborted)
	 52 - FreeRTOS_TCP_Transmission_IPv6_utest (Subprocess aborted)
	 57 - FreeRTOS_Sockets_IPv6_utest (Subprocess aborted)
	 58 - FreeRTOS_Routing_utest (Subprocess aborted)
	 60 - FreeRTOS_Routing_ConfigCompatibleWithSingle_utest (Subprocess aborted)

The first failure is test_xCheckRequiresARPResolution_AssertInvalidFrameType() in FreeRTOS_ARP_utest.
After reducing it to the minimal failing testcase, I have this:

void test_catch_assert()
{
    catch_assert(configASSERT(0));
}

Which leaves this backtrace in GDB:

Program received signal SIGABRT, Aborted.
0x00007ffff7c9dc9c in __pthread_kill_implementation () from /lib64/libc.so.6
Missing separate debuginfos, use: zypper install glibc-debuginfo-2.42-3.3.x86_64
(gdb) bt
#0  0x00007ffff7c9dc9c in __pthread_kill_implementation () from /lib64/libc.so.6
#1  0x00007ffff7c42786 in raise () from /lib64/libc.so.6
#2  0x00007ffff7c2934b in abort () from /lib64/libc.so.6
#3  0x00007ffff7c29295 in __assert_fail_base.cold () from /lib64/libc.so.6
#4  0x00000000004082c9 in test_catch_assert ()
#5  0x000000000040c4b5 in run_test ()
#6  0x000000000040c7f4 in main ()

Target

• Instruction Set Architecture: x86-64 (native compilation)
• Toolchain and version: gcc 15.2.1 20260202

Host

• Host OS: openSUSE Tumbleweed
• Version: 20260408

To Reproduce

• Run the script embedded in test/unit-test/README.md

Additional context

I don't suspect this to be relevant, but I had to update the submodule tools/CMock/vendor/unity to the latest origin/HEAD in order to get a fix for a Ruby 4 incompatibility before I could build the tests.