linux-kernel - [scsi-mq] WARNING: CPU: 0 PID: 99 at block/elevator.c:193 elevator

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Date:	Mon, 23 Dec 2013 11:16:24 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	LKP <fnstml-lkp@...fujitsu.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [scsi-mq] WARNING: CPU: 0 PID: 99 at block/elevator.c:193
 elevator_init()

Greetings,

I got the below dmesg and the first bad commit is

commit 29ff818720ce09b044652b83e9c70ef474800d54
Author:     Nicholas Bellinger <nab@...ux-iscsi.org>
AuthorDate: Thu May 23 22:11:38 2013 -0700
Commit:     Nicholas Bellinger <nab@...ux-iscsi.org>
CommitDate: Sun Dec 22 13:00:48 2013 +0000

    scsi-debug: Enable scsi-mq operation
    
    v4 changes:
      - Bump can_queue to 64 for performance testing
      - Enable scsi-mq DIF support
      - Add nop_fs_io module parameter for performance testing
    
    Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>

+-----------------------------------------------------+----+
|                                                     |    |
+-----------------------------------------------------+----+
| boot_successes                                      | 0  |
| boot_failures                                       | 19 |
| WARNING:CPU:PID:at_block/elevator.c:elevator_init() | 19 |
+-----------------------------------------------------+----+

[    4.763205]   CPU 1 -> Queue 0
[    4.764566] ------------[ cut here ]------------
[    4.764566] ------------[ cut here ]------------
[    4.765951] WARNING: CPU: 0 PID: 99 at block/elevator.c:193 elevator_init+0xf0/0xfb()

Attached are the full dmesg and kconfig.

Thanks,
Fengguang

View attachment "dmesg-quantal-athens-16:20131222211843:i386-randconfig-r3-1222:3.13.0-rc3-00015-g3d712c2:1" of type "text/plain" (293744 bytes)

View attachment "config-3.13.0-rc3-00015-g3d712c2" of type "text/plain" (81095 bytes)