Am 17.11.2015 um 20:15 schrieb Thomas Gleixner:
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 ...
I've now also two gdb backtraces from two crashes: http://pastebin.com/raw.php?i=yih5jNt8 http://pastebin.com/raw.php?i=kGEcvH4T Stefan
Thanks, tglx
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