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    SubjectRe: Asterisk deadlocks since Kernel 4.1
    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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