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SubjectRe: Asterisk deadlocks since Kernel 4.1

Am 17.11.2015 um 20:43 schrieb Thomas Gleixner:
> On Tue, 17 Nov 2015, Stefan Priebe wrote:
>> I've now also two gdb backtraces from two crashes:
> They don't tell me anything as I have no idea of the inner workings of
> asterisk. You might be better of to talk to the asterisk folks to help
> you track down what that thing is waiting for, so we can actually look
> at a well defined area.

The asterisk guys told me it's a livelock asterisk is waiting for
getaddrinfo / recvmsg.

Thread 2 (Thread 0x7fbe989c6700 (LWP 12890)):
#0 0x00007fbeb9eb487d in recvmsg () from /lib/x86_64-linux-gnu/
#1 0x00007fbeb9ed4fcc in ?? () from /lib/x86_64-linux-gnu/
#2 0x00007fbeb9ed544a in ?? () from /lib/x86_64-linux-gnu/
#3 0x00007fbeb9e92007 in getaddrinfo () from
#4 0x00000000004f2e81 in ast_sockaddr_resolve
(addrs=addrs@entry=0x7fbe989c48d8, str=<optimized out>,
str@entry=0x7fbe989c4a80 "", flags=flags@entry=0,
family=2) at netsock2.c:268
#5 0x00007fbeb095fb8b in ast_sockaddr_resolve_first_af
(family=<optimized out>, flag=0, name=0x7fbe989c4a80 "",
addr=0x7fbeb4114948) at chan_sip.c:30797
#6 ast_sockaddr_resolve_first_transport (transport=<optimized out>,
flag=0, name=0x7fbe989c4a80 "",
addr=0x7fbeb4114948) at chan_sip.c:30828
#7 set_destination (uri=<optimized out>, p=0x7fbeb4114438) at
#8 reqprep (req=req@entry=0x7fbe989c4fc0, p=p@entry=0x7fbeb4114438,
sipmethod=sipmethod@entry=8, seqno=<optimized out>,
seqno@entry=0, newbranch=newbranch@entry=1) at chan_sip.c:10925
---Type <return> to continue, or q <return> to quit---
#9 0x00007fbeb0969968 in transmit_request_with_auth
(p=p@entry=0x7fbeb4114438, newbranch=1, reliable=XMIT_RELIABLE, seqno=0,
sipmethod=8) at chan_sip.c:14296
#10 0x00007fbeb098b704 in sip_hangup (ast=<optimized out>) at
#11 0x0000000000477b55 in ast_hangup (chan=chan@entry=0x7fbeb40ef018) at
#12 0x000000000050ce1b in __ast_pbx_run (c=c@entry=0x7fbeb40ef018,
args=args@entry=0x0) at pbx.c:5729
#13 0x000000000050e426 in pbx_thread (data=data@entry=0x7fbeb40ef018) at
#14 0x0000000000548aaa in dummy_start (data=<optimized out>) at utils.c:1151
#15 0x00007fbeb965eb50 in start_thread () from
#16 0x00007fbeb9eb395d in clone () from /lib/x86_64-linux-gnu/
#17 0x0000000000000000 in ?? ()

In both cases, the thread is waiting in recvmsg.


> Thanks,
> tglx

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