19.12.2015 11:15, Michael Tokarev wrote:
>> commit ebac1202c95a4f1b76b6ef3f0f63926fa76e753e
>> Author: Paolo Bonzini <pbonz...@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
In 9pfs/virtio-9p-coth.c:co_run_in_worker_bh(), in this context:
void co_run_in_worker_bh(void *opaque)
{
Coroutine *co = opaque;
thread_pool_submit_aio(qemu_get_aio_context()->thread_pool,
coroutine_enter_func, co, coroutine_enter_cb, co);
}
qemu_get_aio_context()->thread_pool is NULL.
Thanks,
/mjt
