Re: [Qemu-discuss] qemu-img convert stuck

[Benny Zlotnik]

$ gdb -p 13024 -batch -ex "thread apply all bt"
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007f98275cfaff in ppoll () from /lib64/libc.so.6

Thread 1 (Thread 0x7f983e30ab00 (LWP 13024)):
#0  0x00007f98275cfaff in ppoll () from /lib64/libc.so.6
#1  0x000055b55cf59d69 in qemu_poll_ns ()
#2  0x000055b55cf5ba45 in aio_poll ()
#3  0x000055b55ceedc0f in bdrv_get_block_status_above ()
#4  0x000055b55cea3611 in convert_iteration_sectors ()
#5  0x000055b55cea4352 in img_convert ()
#6  0x000055b55ce9d819 in main ()


On Sun, Apr 8, 2018 at 10:28 PM, Nir Soffer <address@hidden> wrote:

> On Sun, Apr 8, 2018 at 9:27 PM Benny Zlotnik <address@hidden> wrote:
>
>> Hi,
>>
>> As part of copy operation initiated by rhev got stuck for more than a day
>> and consumes plenty of CPU
>> vdsm     13024  3117 99 Apr07 ?        1-06:58:43 /usr/bin/qemu-img
>> convert
>> -p -t none -T none -f qcow2
>> /rhev/data-center/bb422fac-81c5-4fea-8782-3498bb5c8a59/
>> 26989331-2c39-4b34-a7ed-d7dd7703646c/images/597e12b6-
>> 19f5-45bd-868f-767600c7115e/62a5492e-e120-4c25-898e-9f5f5629853e
>> -O raw /rhev/data-center/mnt/mantis-nfs-lif1.lab.eng.tlv2.redhat.com:
>> _vol__service/26989331-2c39-4b34-a7ed-d7dd7703646c/images/
>> 9ece9408-9ca6-48cd-992a-6f590c710672/06d6d3c0-beb8-4b6b-ab00-56523df185da
>>
>> The target image appears to have no data yet:
>> qemu-img info 06d6d3c0-beb8-4b6b-ab00-56523df185da"
>> image: 06d6d3c0-beb8-4b6b-ab00-56523df185da
>> file format: raw
>> virtual size: 120G (128849018880 bytes)
>> disk size: 0
>>
>> strace -p 13024 -tt -T -f shows only:
>> ...
>> 21:13:01.309382 ppoll([{fd=12, events=POLLIN|POLLERR|POLLHUP}], 1, {0,
>> 0},
>> NULL, 8) = 0 (Timeout) <0.000010>
>> 21:13:01.309411 ppoll([{fd=12, events=POLLIN|POLLERR|POLLHUP}], 1, {0,
>> 0},
>> NULL, 8) = 0 (Timeout) <0.000009>
>> 21:13:01.309440 ppoll([{fd=12, events=POLLIN|POLLERR|POLLHUP}], 1, {0,
>> 0},
>> NULL, 8) = 0 (Timeout) <0.000009>
>> 21:13:01.309468 ppoll([{fd=12, events=POLLIN|POLLERR|POLLHUP}], 1, {0,
>> 0},
>> NULL, 8) = 0 (Timeout) <0.000010>
>>
>> version: qemu-img-rhev-2.9.0-16.el7_4.13.x86_64
>>
>> What could cause this? I'll provide any additional information needed
>>
>
> A backtrace may help, try:
>
> gdb -p 13024 -batch -ex "thread apply all bt"
>
> Also adding Kevin and qemu-block.
>
> Nir
>