Hi, I am running bpf selftests on a Loonarch PC and observed intermittent kernel lockup by timer_lockup, then I can repeat the lockup just by running the timer_lockup in while loop every 5 seconds, I could not find a good x86 machine to test, and I think this might be architecture independent. I don't have a good way to capture any kernel log messages for the PC after the kernel hangs, and I had to power reset the PC. [root@fedora ~]# uname -a Linux fedora 6.17.0-rc2+ #20 SMP PREEMPT_DYNAMIC Thu Aug 21 13:08:01 PDT 2025 loongarch64 GNU/Linux [root@fedora bpf]# while true ; do ./test_progs -t timer_lockup --watchdog-timeout=120; sleep 5; done #458 timer_lockup:OK Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED #458 timer_lockup:OK Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED WATCHDOG: test case timer_lockup executes for 10 seconds... WATCHDOG: test case timer_lockup executes for 120 seconds, terminating with SIGSEGV test_timer_lockup:PASS:timer_lockup__open_and_load 0 nsec test_timer_lockup:PASS:pthread_create thread1 0 nsec test_timer_lockup:PASS:pthread_create thread2 0 nsec timer_lockup_thread:PASS:cpu affinity 0 nsec timer_lockup_thread:PASS:cpu affinity 0 nsec #458 timer_lockup:FAIL Caught signal #11! Stack trace: ./test_progs(crash_handler+0x28)[0x120555b04] linux-vdso.so.1(__vdso_rt_sigreturn+0x0)[0x7ffffee55084] /lib64/libc.so.6(+0x7d900)[0x7fffef9b1900] /lib64/libc.so.6(+0x82cc0)[0x7fffef9b6cc0] ./test_progs(test_timer_lockup+0x3fc)[0x1204bce28] ./test_progs[0x120556244] ./test_progs(main+0x684)[0x120558234] /lib64/libc.so.6(+0x2882c)[0x7fffef95c82c] /lib64/libc.so.6(__libc_start_main+0xa8)[0x7fffef95c918] ./test_progs(_start+0x48)[0x12010f2d0] Thanks, Vincent
