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

[Glen Barber]

On Tue, Mar 30, 2021 at 04:48:25PM +0300, Christos Chatzaras wrote:
> 
> 
> > 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?

If it resolves the issue, yes.

Glen

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