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From: Michael Tokarev <mjt@tls.msk.ru>
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Date: Sat, 19 Dec 2015 11:15:11 +0300
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Subject: Re: [Qemu-devel] 9pfs is broken in 2.5 (SIGSEGV) (bisected)
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To: qemu-devel <qemu-devel@nongnu.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Greg Kurz <gkurz@linux.vnet.ibm.com>

19.12.2015 11:05, Michael Tokarev wrote:

> commit ebac1202c95a4f1b76b6ef3f0f63926fa76e753e
> Author: Paolo Bonzini <pbonzini@redhat.com>
> Date:   Fri Nov 27 12:43:06 2015 +0100
>     virtio-9p: use QEMU thread pool

Program received signal SIGSEGV, Segmentation fault.
thread_pool_submit_aio (pool=0x0, func=0x55555580f6a0 <coroutine_enter_func>, arg=0x555557698870, cb=<optimized out>,
    opaque=<optimized out>) at /build/kvm/git/thread-pool.c:246
246	    QLIST_INSERT_HEAD(&pool->head, req, all);
(gdb) bt
#0  thread_pool_submit_aio (pool=0x0, func=0x55555580f6a0 <coroutine_enter_func>, arg=0x555557698870, cb=<optimized out>,
    opaque=<optimized out>) at /build/kvm/git/thread-pool.c:246
#1  0x000055555592c9ed in aio_bh_call (bh=<optimized out>) at /build/kvm/git/async.c:64
#2  aio_bh_poll (ctx=ctx@entry=0x5555563c9360) at /build/kvm/git/async.c:92
#3  0x0000555555939390 in aio_dispatch (ctx=0x5555563c9360) at /build/kvm/git/aio-posix.c:305
#4  0x000055555592c7de in aio_ctx_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>)
    at /build/kvm/git/async.c:231
#5  0x00007ffff49d1c5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x0000555555937cf8 in glib_pollfds_poll () at /build/kvm/git/main-loop.c:211
#7  os_host_main_loop_wait (timeout=<optimized out>) at /build/kvm/git/main-loop.c:256
#8  main_loop_wait (nonblocking=<optimized out>) at /build/kvm/git/main-loop.c:504
#9  0x00005555556dbe3e in main_loop () at /build/kvm/git/vl.c:1923
#10 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at /build/kvm/git/vl.c:4684
(gdb) p pool
$2 = (ThreadPool *) 0x0

Woops.

/mjt