Re: block: hung task writing to device

From: Levin, Alexander (Sasha Levin)
Date: Mon Jul 10 2017 - 20:03:15 EST

On Sat, Jul 08, 2017 at 07:29:20PM -0600, Jens Axboe wrote:
>On 07/08/2017 01:06 PM, Levin, Alexander (Sasha Levin) wrote:
>> Hi all,
>> syzkaller seems to be hitting a lockup with the reproducer below:
>Thanks for the reproducer, but this is missing a lot of detail that we
>need to debug this issue. Is this a regression since 4.12? What storage
>device is this? Is the device using an IO scheduler?

I've started seeing this while testing on -next, so this regression started after v4.12.

The fuzzer runs in qemu, the block device is the result of the "-hda" parameter to qemu. As far as I can tell this results the creation of an ATA device.

>dmesg after boot and .config would be helpful, too.

Attached boot dmesg and config.



Attachment: bootlog.txt.gz
Description: bootlog.txt.gz

Attachment: config-sasha.gz
Description: config-sasha.gz