On 2024/05/15 7:41, Hillf Danton wrote: > On Tue, 14 May 2024 20:07:34 +0800 Sam Sun <samsun1006219@xxxxxxxxx> >> >> I tried to run >> >> # echo 0 > /proc/sys/kernel/hung_task_all_cpu_backtrace >> >> before running the reproducer, the kernel stops panic. But still, even >> if I terminate the execution of the reproducer, kernel continues >> dumping task hung logs. After setting bung_task_all_cpu_backtrace back >> to 1, it panic immediately during next dump. So I guess it is still a >> task hung instead of general protection fault. > > Given kworker/u10:2:53 blocked for more than 143 seconds, or the subject > line, how could it trigger gpf? Since CONFIG_CMDLINE in the attached config file includes sysctl.kernel.hung_task_all_cpu_backtrace=1 , khungtaskd calls trigger_all_cpu_backtrace() when a hung task is detected. trigger_all_cpu_backtrace() is expected to be safe, but there seems a bug which is triggering a general protection fault.
