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SubjectRe: Asterisk deadlocks since Kernel 4.1
Am 18.11.2015 um 22:18 schrieb Florian Weimer:
> On 11/18/2015 09:23 PM, Stefan Priebe wrote:
>> 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
>> /lib/x86_64-linux-gnu/
> Stefan,
> please try to get a backtrace with debugging information. It is likely
> that this is the make_request/__check_pf functionality in glibc, but it
> would be nice to get some certainty.

sorry here it is. What I'm wondering is why is there ipv6 stuff? I don't
have ipv6 except for link local. Could it be this one?

Thread 31 (Thread 0x7f295c011700 (LWP 26654)):
#0 0x00007f295de3287d in recvmsg () at
#1 0x00007f295de52fcc in make_request (fd=35, pid=26631,
seen_ipv4=<optimized out>, seen_ipv6=<optimized out>,
in6ai=<optimized out>, in6ailen=<optimized out>) at
#2 0x00007f295de5344a in __check_pf (seen_ipv4=0x7f295c00e85f,
seen_ipv6=0x7f295c00e85e, in6ai=0x7f295c00e840,
in6ailen=0x7f295c00e838) at ../sysdeps/unix/sysv/linux/check_pf.c:271
#3 0x00007f295de10007 in *__GI_getaddrinfo (name=0x7f295c00e8b0
"", service=0x7f295c00e8bc "2135",
hints=0x7f295c00e910, pai=0x7f295c00e908) at
#4 0x000000000050287e in ast_sockaddr_resolve (addrs=0x7f295c00e9d0,
str=0x7f295c00ea30 "", flags=0, family=2)
at netsock2.c:268
#5 0x00007f2958963ba2 in ast_sockaddr_resolve_first_af
(addr=0x7f29300591d8, name=0x7f295c00ea30 "", flag=0,
family=2) at chan_sip.c:30689
#6 0x00007f2958963cb5 in ast_sockaddr_resolve_first_transport
(addr=0x7f29300591d8, name=0x7f295c00ea30 "",
flag=0, transport=1) at chan_sip.c:30720
#7 0x00007f29588fd3cc in set_destination (p=0x7f2930058cc8,
uri=0x7f29300576e8 "sip:9052@;line=to7a729l")
at chan_sip.c:10455
#8 0x00007f29588fe6e0 in reqprep (req=0x7f295c00fee0, p=0x7f2930058cc8,
sipmethod=4, seqno=287, newbranch=1) at chan_sip.c:10778
#9 0x00007f295890a201 in transmit_state_notify (p=0x7f2930058cc8,
state=1, full=1, timeout=0) at chan_sip.c:13259
#10 0x00007f29589141bb in cb_extensionstate (context=0x7f295c010cd0
"hints", exten=0x7f295c010c80 "9052QS", state=1,
data=0x7f2930058cc8) at chan_sip.c:15117
#11 0x000000000050ebf6 in handle_statechange (datap=0x7f293acef830) at
#12 0x0000000000555f8e in tps_processing_function (data=0x1f24f28) at
#13 0x0000000000569280 in dummy_start (data=0x1ed76f0) at utils.c:1173
#14 0x00007f295d5dcb50 in start_thread (arg=<optimized out>) at
#15 0x00007f295de3195d in clone () at
#16 0x0000000000000000 in ?? ()

> Which glibc version do you use? Has it got a fix for CVE-2013-7423?
> So far, the only known cause for a hang in this place (that is, lack of
> return from recvmsg) is incorrect file descriptor use. (CVE-2013-7423
> is such an issue in glibc itself.) The kernel upgrade could change
> scheduling behavior, and the actual bug might have been latent before.
> Theoretically, recvmsg could also hang if the Netlink query was dropped
> by the kernel, or the final packet in the response was dropped. We
> never saw that happen, even under extreme load, but I didn't test with
> recent kernels.
> The glibc change Hannes mentioned won't detect the hang, but if there is
> incorrect file descriptor reuse going on, it is possible that the new
> assert catches it.
> Florian

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