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Date:	Wed, 12 Feb 2014 10:47:28 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org
Subject: [null_blk] INFO: trying to register non-static key.

Hi Jens,

I got the below dmesg and the first bad commit is

commit f2298c0403b0dfcaef637eba0c02c4a06d7a25ab
Author:     Jens Axboe <axboe@...nel.dk>
CommitDate: Fri Oct 25 11:56:00 2013 +0100

    null_blk: multi queue aware block test driver
    
    A driver that simply completes IO it receives, it does no
    transfers. Written to fascilitate testing of the blk-mq code.
    It supports various module options to use either bio queueing,
    rq queueing, or mq mode.
    
    Signed-off-by: Jens Axboe <axboe@...nel.dk>

[   18.158432] VFS: could not find a valid V7 on nullb0.
[   18.159280] LogFS: Start mount 1
[   18.159732] LogFS: Start unmounting
[   18.160368] INFO: trying to register non-static key.
[   18.160986] the code is fine but needs lockdep annotation.
[   18.161675] turning off the locking correctness validator.
[   18.162341] CPU: 0 PID: 634 Comm: mount Not tainted 3.14.0-rc2-wl-01363-gf8a1366 #2
[   18.163266]  0000000000000000 ffff88000b839c00 ffffffff827922a5 ffff88000b839cb8
[   18.163516]  ffffffff810c0202 ffff88000bac1008 ffff88000b839c98 ffff88000b839c58
[   18.163516]  0000000000000002 ffff88000bb4f000 ffff880000000000 ffffffff00000001
[   18.163516] Call Trace:
[   18.163516]  [<ffffffff827922a5>] dump_stack+0x19/0x1b
[   18.163516]  [<ffffffff810c0202>] __lock_acquire+0x252/0x1d80
[   18.163516]  [<ffffffff8115cc10>] ? writeback_inodes_sb_nr+0xc0/0xe0
[   18.163516]  [<ffffffff81296146>] ? logfs_get_wblocks+0x76/0x90
[   18.163516]  [<ffffffff810c2590>] lock_acquire+0x70/0x90
[   18.163516]  [<ffffffff81296146>] ? logfs_get_wblocks+0x76/0x90
[   18.163516]  [<ffffffff827a26f1>] mutex_lock_nested+0x61/0x380
[   18.163516]  [<ffffffff81296146>] ? logfs_get_wblocks+0x76/0x90
[   18.163516]  [<ffffffff81296146>] logfs_get_wblocks+0x76/0x90
[   18.163516]  [<ffffffff81293024>] logfs_sync_fs+0x14/0x30
[   18.163516]  [<ffffffff81160929>] sync_filesystem+0x59/0xb0
[   18.163516]  [<ffffffff8129a327>] logfs_kill_sb+0x27/0xf0
[   18.163516]  [<ffffffff81137afd>] deactivate_locked_super+0x2d/0x50
[   18.163516]  [<ffffffff8129b1f3>] logfs_mount+0x763/0x7e0
[   18.163516]  [<ffffffff811391d0>] mount_fs+0x10/0xe0
[   18.163516]  [<ffffffff81153f49>] vfs_kern_mount+0x69/0x140
[   18.163516]  [<ffffffff827a5efc>] ? _raw_read_unlock+0x2c/0x50
[   18.163516]  [<ffffffff81156354>] do_mount+0x934/0xb90
[   18.163516]  [<ffffffff81111462>] ? might_fault+0x52/0xb0
[   18.163516]  [<ffffffff811040a5>] ? strndup_user+0x35/0x50
[   18.163516]  [<ffffffff811568fc>] SyS_mount+0x8c/0xd0
[   18.163516]  [<ffffffff827a713b>] system_call_fastpath+0x1a/0x1f

git bisect start v3.13 v3.12 --
git bisect  bad 3bad8bb5cd3048a67df43ac6b1e2f191f19d9ff0  # 21:46      1-      2  Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
git bisect  bad 049ffa8ab33a63b3bff672d1a0ee6a35ad253fe8  # 22:16      0-      1  Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
git bisect good 7e238a2ecd117e16b154e1b0ed77906596600ff5  # 22:48     40+      6  Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
git bisect  bad 0910c0bdf7c291a41bc21e40a97389c9d4c1960d  # 23:07      1-      1  Merge branch 'for-3.13/core' of git://git.kernel.dk/linux-block
git bisect good a9986464564609dd0962e6023513f7d3d313dc80  # 23:45     40+      0  Merge branch 'for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
git bisect good f0230294271f511b41797305b685365a9e569a09  # 00:20     40+      4  Merge tag 'dlm-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm
git bisect good 42a2d923cc349583ebf6fdd52a7d35e1c2f7e6bd  # 00:49     40+      2  Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
git bisect good f47671e2d861a2093179cd64dda22016664b2015  # 01:08     40+      4  Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm
git bisect good 2821fe6b00a1e902fd399bb4b7e40bc3041f4d44  # 01:25     40+     24  Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
git bisect good 8616ebb16bcef312024b9d28719f9bf5c5c3aafb  # 01:48     40+      0  block: replace IS_ERR and PTR_ERR with PTR_ERR_OR_ZERO
git bisect good 1dddc01af0d42b21058e0cb9c1ca9e8d5204d9b0  # 02:16     40+      2  percpu_ida: add an API to return free tags
git bisect  bad 3228f48be2d19b2dd90db96ec16a40187a2946f3  # 02:24     13-      3  blk-mq: fix for flush deadlock
git bisect  bad f2298c0403b0dfcaef637eba0c02c4a06d7a25ab  # 02:47      8-      7  null_blk: multi queue aware block test driver
git bisect good 320ae51feed5c2f13664aa05a76bec198967e04d  # 03:17     63+      4  blk-mq: new multi-queue block IO queueing mechanism
# first bad commit: [f2298c0403b0dfcaef637eba0c02c4a06d7a25ab] null_blk: multi queue aware block test driver
git bisect good 320ae51feed5c2f13664aa05a76bec198967e04d  # 03:34    189+     28  blk-mq: new multi-queue block IO queueing mechanism
git bisect  bad f8a13667ab9da01df61cc915bc4c56bb652f6bc4  # 03:35      0-     13  0day head guard for 'devel-hourly-2014021108'
git bisect  bad 6792dfe383dd20ed270da198aa0676bac47245b4  # 03:41      8-      3  Merge branch 'akpm' (patches from Andrew Morton)
git bisect  bad ea2ad567c12336608ae96f244f3dc3932c1fcd1b  # 03:54      7-      1  Add linux-next specific files for 20140211

Thanks,
Fengguang

View attachment "dmesg-yocto-nhm4-2:20140211130503:x86_64-randconfig-i1-02111125:3.14.0-rc2-wl-01363-gf8a1366:2" of type "text/plain" (257594 bytes)

Download attachment "x86_64-randconfig-i1-02111125-f8a13667ab9da01df61cc915bc4c56bb652f6bc4-deactivate_locked_super+-x-122541.log" of type "application/octet-stream" (47553 bytes)

View attachment "config-3.14.0-rc2-wl-01363-gf8a1366" of type "text/plain" (107075 bytes)

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