linux-kernel - blk-mq v3.18: Oops during virtio

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Date:	Fri, 09 Jan 2015 15:32:04 +0100
From:	Sebastian Parschauer <sebastian.riemer@...fitbricks.com>
To:	Jens Axboe <axboe@...nel.dk>
CC:	Eduardo Otubo <eduardo.otubo@...fitbricks.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	virtualization@...ts.linux-foundation.org
Subject: blk-mq v3.18: Oops during virtio_blk hot-unplug

Hi Jens,

my colleague Eduardo is sporadically seeing an Oops in blk-mq while
running continuous virtio_blk hot-plug/hot-unplug tests with I/O to the
device within an x86_64 QEMU/KVM 2.0 Debian Wheezy VM.

Please find the call trace attached and the full log here:
http://paste.ubuntu.com/9691873/

The kernel image has been taken from here and is the mainline kernel
from tag v3.18:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-vivid/

Is there still an issue with block queue freezing?

We are seeing a similar issue with v3.16 but more often as some block
queue freezing fixes have been added in v3.17.

All kernels without blk-mq used by virtio_blk (< v3.13) work fine.

Cheers,
Sebastian

View attachment "blk-mq_3.18_virtio_blk_hot-unplug_oops.txt" of type "text/plain" (3324 bytes)