[mainline] selftests/bpf: struct_ops_assoc test hangs indefinitely on PowerPC

[Venkat Rao Bagalkote]

Greetings!!!

The struct_ops_assoc/st_ops_assoc_in_timer selftest hangs indefinitely on
PowerPC, spinning in sched_yield() until watchdog timeout.

**Test Failure:**

./test_progs -t struct_ops_assoc
WATCHDOG: test case struct_ops_assoc/st_ops_assoc_in_timer executes for 
10 seconds...
WATCHDOG: test case struct_ops_assoc/st_ops_assoc_in_timer executes for 
120 seconds, terminating with SIGSEGV
#445     struct_ops_assoc:FAIL


**Architecture:** PowerPC 64-bit (ppc64le)
**Kernel:** 7.1.0-rc5-00149-g8fde5d1d47f6

**Symptoms:**

Test hangs indefinitely in infinite loop, repeatedly calling sched_yield():


Stack trace:
./test_progs(crash_handler+0x34)
linux-vdso64.so.1(__kernel_sigtramp_rt64+0x0)
/lib64/libc.so.6(__sched_yield+0x2c)  ← stuck here
./test_progs() [0x105ae220]
./test_progs(test_struct_ops_assoc+0x88)
./test_progs(main+0x7ac)



If you happen to fix this, please add below tag.


Reported-by: Venkat Rao Bagalkote <venkat88@xxxxxxxxxxxxx>


Regards,

Venkat.