[libvirt] [PATCH 0/9] Resolve libvirtd hang on termination with connected long running client

[Marc Hartmayer]

On Tue, Jul 03, 2018 at 09:21 PM +0200, John Ferlan <jferlan at redhat.com> wrote:
>>
>> Is there any update so far? I’m asking because I’m still getting
>> segmentation faults and hang-ups on termination of libvirtd (using the
>> newest version of libvirt).
>>
>> Example for a hang-up:
>> ➤  bt
>> #0  0x000003fffca8df84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
>> #1  0x000003fffdac29ca in virCondWait (c=<optimized out>, m=<optimized out>) at ../../src/util/virthread.c:154
>> #2  0x000003fffdac381c in virThreadPoolFree (pool=<optimized out>) at ../../src/util/virthreadpool.c:290
>> #3  0x000003fffdbb21ae in virNetServerDispose (obj=0x1000cc640) at ../../src/rpc/virnetserver.c:803
>> #4  0x000003fffda97286 in virObjectUnref (anyobj=<optimized out>) at ../../src/util/virobject.c:350
>> #5  0x000003fffda97a5a in virObjectFreeHashData (opaque=<optimized out>, name=<optimized out>) at ../../src/util/virobject.c:591
>> #6  0x000003fffda66576 in virHashFree (table=<optimized out>) at ../../src/util/virhash.c:305
>> #7  0x000003fffdbaff82 in virNetDaemonDispose (obj=0x1000cc3c0) at ../../src/rpc/virnetdaemon.c:105
>> #8  0x000003fffda97286 in virObjectUnref (anyobj=<optimized out>) at ../../src/util/virobject.c:350
>> #9  0x0000000100026cd6 in main (argc=<optimized out>, argv=<optimized out>) at ../../src/remote/remote_daemon.c:1487
>>
>> And segmentation faults happen for RPC jobs that are still running.
>>
>
> There has been zero of my cycles spent thinking about this. Partially
> because I'm busy in other areas, partially because I know Daniel is
> planning changes in libvirtd
> (https://www.redhat.com/archives/libvir-list/2018-May/msg01307.html),
> and partially because I'm not sure I have a {reliable|simple} reproducer
> (at least I don't recall).

I do a simple start/destroy loop and send a SIGTERM to libvirtd. This
leads in almost every case to a segmentation fault.

>
> I do still have various branches in various states of disarray that are
> way behind current head (easy to happen it seems lately).
>
> John
>
--
Beste Grüße / Kind regards
   Marc Hartmayer

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