On 06/07, Wei Fu wrote: > > Yes. I applied your patch on v5.15.160 and run reproducer for 5 hours. > I didn't see this issue. Currently, it looks good!. I will continue that test > on this weekend. Great, thanks! > In last reply, you mentioned TIF_NOTIFY_SIGNAL related to busy-wait loop. > Would you please explain why flag-clear works here? Sure, I'll write the changelog with the explanation and send the patch on weekend. If it passes your testing. But in short this is very simple. zap_pid_ns_processes() clears TIF_SIGPENDING exactly because we want to avoid the busy-wait loop. But today this is not enough to make signal_pending() return F, see include/linux/sched/signal.h:signal_pending(). Thanks, Oleg.
