FreeBSD 13.0-RC4 and Nginx process "stuck" during restart

[Christos Chatzaras]

> On 30 Mar 2021, at 16:45, Mark Johnston <markj at freebsd.org> wrote:
> 
> On Mon, Mar 29, 2021 at 10:57:09PM +0300, Christos Chatzaras wrote:
>> Hello,
>> 
>> 
>> I upgrade from 12.2 to 13.0-RC4 and I notice a strange issue with Nginx.
>> 
>> When I run "service nginx restart" in some (random) servers it doesn't complete the restart and it "stucks" at "Waiting for PIDS: 20536." .
>> 
>> I can kill the 20536 process and then restart completes.
>> 
>> 
>> procstat -kk 20536:
>> 
>>  PID    TID COMM                TDNAME              KSTACK
>> 63094 100505 nginx               -                   mi_switch+0xc1 sleepq_catch_signals+0x2e6 sleepq_wait_sig+0x9 _sleep+0x1be kern_sigsuspend+0x164 sys_sigsuspend+0x31 amd64_syscall+0x10c fast_syscall_common+0xf8 
>> 
>> 
>> I found this commit:
>> 
>> https://cgit.freebsd.org/src/commit/?id=dbec10e08808e375365fb2a2462f306e0cdfda32 <https://cgit.freebsd.org/src/commit/?id=dbec10e08808e375365fb2a2462f306e0cdfda32>
>> 
>> Could this be related? If yes can we have the patch in releng/13.0 ?
> 
> I think it is hard to say without some testing.  Are you able to verify
> that backporting the patch fixes the hangs?


I will use the patch today night, so I can verify it tomorrow morning.

If it works do we still have time to land the patch in 13.0?