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Re: Asterisk deadlocks since Kernel 4.1

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject Re: Asterisk deadlocks since Kernel 4.1
Date 2015-11-17 20:20 +0100
Message-ID <qvTXk-J9-13@gated-at.bofh.it> (permalink)
References <qvPK2-6hQ-11@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue, 17 Nov 2015, Stefan Priebe - Profihost AG wrote:
> since Upgrading our Asterisk System from Kernel 3.18.17 to 4.1.13 it
> deadlocks every few hours (kill -9 is the only thing working). Booting
> with 3.18 again let it run smooth again.
> 
> An strace shows asterisk is looping like this:
> 
> [pid  6068] timerfd_gettime(8, , {it_interval={0, 20000000},
> it_value={0, 140592906050976}}) = 0
> [pid  6068] read(8, "\1\0\0\0\0\0\0\0", 8) = 8
> [pid  6068] poll([{fd=9, events=POLLIN}, {fd=8, events=POLLIN|POLLPRI}],
> 2, 1000) = 1 ([{fd=8, revents=POLLIN}])
> [pid  6068] timerfd_gettime(8, , {it_interval={0, 20000000},
> it_value={0, 140592906050976}}) = 0
> [pid  6068] read(8, "\1\0\0\0\0\0\0\0", 8) = 8
> 
> fd 8 is:
> 
> lrwx------ 1 root root 64 Nov 17 15:27 /proc/6025/fd/8 ->
> anon_inode:[timerfd]
> 
> 
> # cat /proc/6025/stack
> [<ffffffff941d60e9>] poll_schedule_timeout+0x49/0x70
> [<ffffffff941d76c7>] do_sys_poll+0x3d7/0x590
> [<ffffffff941d78bc>] do_restart_poll+0x3c/0x70
> [<ffffffff9408e7ff>] sys_restart_syscall+0x1f/0x30
> [<ffffffff9463f1ee>] system_call_fastpath+0x12/0x71
> [<ffffffffffffffff>] 0xffffffffffffffff
> 
> Any ideas how to debug this?

fd 8 is probably not really interesting. That looks like a interval
timer firing periodically. So it probably waits for fd 9 ...

Thanks,

	tglx
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Thread

Asterisk deadlocks since Kernel 4.1 Stefan Priebe - Profihost AG <s.priebe@profihost.ag> - 2015-11-17 15:50 +0100
  Re: Asterisk deadlocks since Kernel 4.1 Thomas Gleixner <tglx@linutronix.de> - 2015-11-17 20:20 +0100
    Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe <s.priebe@profihost.ag> - 2015-11-17 20:30 +0100
      Re: Asterisk deadlocks since Kernel 4.1 Thomas Gleixner <tglx@linutronix.de> - 2015-11-17 20:50 +0100
        Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe <s.priebe@profihost.ag> - 2015-11-18 21:30 +0100
          Re: Asterisk deadlocks since Kernel 4.1 Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-18 22:10 +0100
            Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe <s.priebe@profihost.ag> - 2015-11-18 22:30 +0100
              Re: Asterisk deadlocks since Kernel 4.1 Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-18 22:30 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe - Profihost AG <s.priebe@profihost.ag> - 2015-11-19 10:40 +0100
          Re: Asterisk deadlocks since Kernel 4.1 Florian Weimer <fweimer@redhat.com> - 2015-11-18 22:20 +0100
            Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe <s.priebe@profihost.ag> - 2015-11-18 22:30 +0100
              Re: Asterisk deadlocks since Kernel 4.1 Florian Weimer <fweimer@redhat.com> - 2015-11-19 10:40 +0100
            Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe <s.priebe@profihost.ag> - 2015-11-18 22:40 +0100
              Re: Asterisk deadlocks since Kernel 4.1 Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-18 22:50 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe <s.priebe@profihost.ag> - 2015-11-18 22:50 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-18 23:00 +0100
              Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe - Profihost AG <s.priebe@profihost.ag> - 2015-11-19 10:50 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe - Profihost AG <s.priebe@profihost.ag> - 2015-11-19 11:00 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-19 12:50 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe - Profihost AG <s.priebe@profihost.ag> - 2015-11-19 12:50 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-19 13:50 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe - Profihost AG <s.priebe@profihost.ag> - 2015-11-19 13:50 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Florian Weimer <fweimer@redhat.com> - 2015-11-19 14:20 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe <s.priebe@profihost.ag> - 2015-11-19 21:00 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe - Profihost AG <s.priebe@profihost.ag> - 2015-11-23 13:50 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-11-23 14:00 +0100
                Re: Asterisk deadlocks since Kernel 4.1 Stefan Priebe - Profihost AG <s.priebe@profihost.ag> - 2015-11-24 14:40 +0100
              Re: Asterisk deadlocks since Kernel 4.1 Florian Weimer <fweimer@redhat.com> - 2015-11-19 10:50 +0100

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