[Qemu-devel] [Block-io] qemu virtual machine get stuck during startup

[Wahaha Huang]

Hi there,
I'm a newbie of qemu(2.10.0), when i start a vm from qemu, it sometimes get
stuck,
through gdb debugging, i found aio_worker thread(list below) missing when
vm get stuck,
but i don't know why, does anybody has further idea about this?

(gdb) info threads
>
>   Id   Target Id         Frame
>
>   1    LWP 25451 "qemu-system-x86" 0x00007fc62081dc8b in ppoll () from
>> /lib/libc.so.6
>
>   2    LWP 25452 "qemu-system-x86" 0x00007fc620823ee9 in syscall () from
>> /lib/libc.so.6
>
> * 3    LWP 25495 "qemu-system-x86" 0x00007fc620af8e80 in ?? () from
>> /lib/libpthread.so.0
>
>   4    LWP 25496 "qemu-system-x86" 0x00007fc62081f697 in ioctl () from
>> /lib/libc.so.6
>
>   5    LWP 25497 "qemu-system-x86" 0x00007fc62081f697 in ioctl () from
>> /lib/libc.so.6
>
>   6    LWP 25498 "qemu-system-x86" 0x00007fc62081db9d in poll () from
>> /lib/libc.so.6
>
>   7    LWP 25500 "threaded-ml" 0x00007fc62081db9d in poll () from
>> /lib/libc.so.6
>
>   8    LWP 25501 "qemu-system-x86" 0x00007fc620af5e1d in pthread_cond_wait
>> () from /lib/libpthread.so.0
>
>   9    LWP 25502 "qemu-system-x86" 0x00007fc620af5e1d in pthread_cond_wait
>> () from /lib/libpthread.so.0
>
> (gdb) bt
>
> #0  0x00007fc620af8e80 in  () at /lib/libpthread.so.0
>
> #1  0x00007fc620af8f5f in  () at /lib/libpthread.so.0
>
> #2  0x00007fc620af906f in sem_timedwait () at /lib/libpthread.so.0
>
> #3  0x000055b66332e585 in qemu_sem_timedwait (sem=0x55b664e6c868,
>> ms=10000) at util/qemu-thread-posix.c:289
>
> #4  0x000055b6633279b6 in worker_thread (opaque=0x55b664e6c7f0) at
>> util/thread-pool.c:102
>
> #5  0x00007fc620aef767 in  () at /lib/libpthread.so.0
>
> #6  0x00007fc62082985f in clone () at /lib/libc.so.6
>
>