Greetings, I got the below dmesg and the first bad commit is git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git commit 84604340d034a074036e86e85c4055a1c7ea5529 Author: Peter Zijlstra AuthorDate: Tue Feb 11 12:00:36 2014 +0100 Commit: Tejun Heo CommitDate: Tue Feb 11 10:25:17 2014 -0500 workqueue: Fix workqueue lockdep name Tommi noticed a 'funny' lock class name: "%s#5" from a lock acquired in process_one_work(). It turns out that commit b196be89cdc14 forgot to change the lockdep_init_map() when it changed the @lock_name argument from a string to a format. Fixes: b196be89cdc14 ("workqueue: make alloc_workqueue() take printf fmt and args for name") Reported-by: Tommi Rantala Signed-off-by: Peter Zijlstra Signed-off-by: Tejun Heo Cc: stable@vger.kernel.org [ 7.150365] Loading Adaptec I2O RAID: Version 2.4 Build 5go [ 7.151212] Detecting Adaptec I2O RAID controllers... [ 7.153240] ------------[ cut here ]------------ [ 7.153979] WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:710 __lock_acquire+0x1d5/0x8c6() [ 7.154489] CPU: 0 PID: 1 Comm: swapper Not tainted 3.14.0-rc2-next-20140212-02309-g4602175 #3 [ 7.154489] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 7.154489] 00000001 00000000 bf445cec b29f23f5 bf445d04 b10a95f9 b10fa388 b4544b80 [ 7.154489] b02b60b0 bf42e000 bf445d14 b10a96a1 00000009 00000000 bf445d48 b10fa388 [ 7.154489] 00000006 bf42e000 00000000 bf445e14 bf445d3c b10f92d0 00000000 bf42e4e0 [ 7.154489] Call Trace: [ 7.154489] [] dump_stack+0x16/0x18 [ 7.154489] [] warn_slowpath_common+0x72/0x89 [ 7.154489] [] ? __lock_acquire+0x1d5/0x8c6 [ 7.154489] [] warn_slowpath_null+0x14/0x18 [ 7.154489] [] __lock_acquire+0x1d5/0x8c6 [ 7.154489] [] ? trace_hardirqs_on_caller+0x155/0x16f [ 7.154489] [] lock_acquire+0x9e/0x157 [ 7.154489] [] ? flush_workqueue+0x6b/0x98b [ 7.154489] [] flush_workqueue+0x8b/0x98b [ 7.154489] [] ? flush_workqueue+0x6b/0x98b [ 7.154489] [] drain_workqueue+0x73/0x333 [ 7.154489] [] ? trace_hardirqs_on+0xb/0xd [ 7.154489] [] destroy_workqueue+0x15/0x4c8 [ 7.154489] [] scsi_host_dev_release+0x73/0x15b [ 7.154489] [] device_release+0x6f/0xf0 [ 7.154489] [] kobject_cleanup+0xa9/0xd1 [ 7.154489] [] kobject_put+0xb2/0xb7 [ 7.154489] [] put_device+0x2a/0x2c [ 7.154489] [] scsi_unregister+0x37/0x39 [ 7.154489] [] aha1542_detect+0xc2a/0xc42 [ 7.154489] [] ? pnp_find_dev+0xb4/0x185 [ 7.154489] [] ? aha1542_in+0xaf/0xaf [ 7.154489] [] init_this_scsi_driver+0x6b/0x107 [ 7.154489] [] ? aha1542_in+0xaf/0xaf [ 7.154489] [] do_one_initcall+0x81/0x176 [ 7.154489] [] ? repair_env_string+0x3/0x9d [ 7.154489] [] ? parse_args+0x2e8/0x3a1 [ 7.154489] [] kernel_init_freeable+0x1a7/0x26d [ 7.154489] [] kernel_init+0xe/0x13e [ 7.154489] [] ret_from_kernel_thread+0x1b/0x30 [ 7.154489] [] ? rest_init+0x131/0x131 [ 7.154489] ---[ end trace 77d6546bd913b153 ]--- [ 7.181862] NCR53c406a: no available ports found git bisect start d80813ed6679ea0be2d054f2e2085699d1493978 v3.13 -- git bisect good aa2e7100e38880db7907cb2b7ec6267b2b243771 # 12:53 21+ 61 Merge branch 'akpm' (patches from Andrew Morton) git bisect good dd178a56e226296988cd5a6f3499f07f259b4631 # 14:30 21+ 61 Merge remote-tracking branch 'char-misc.current/char-misc-linus' git bisect good b19abf9906eda1d49591a117d2315b02a8a58fa8 # 15:25 21+ 61 Merge remote-tracking branch 'slave-dma/next' git bisect good 9341660bd894be14c9dd67cbd36588aa25dd377e # 18:23 21+ 61 Merge remote-tracking branch 'devicetree/devicetree/next' git bisect bad 522e2050f3a977119a1865b18052351c224bf171 # 18:23 0- 39 Merge remote-tracking branch 'leds/for-next' git bisect good e2cc5d720204e37334aeb329cb7a739d0f235498 # 19:03 31+ 71 Merge remote-tracking branch 'rcu/rcu/next' git bisect good d66402d9b6333251a1f5f7f7fff3319ba99b6038 # 19:31 31+ 70 Merge remote-tracking branch 'percpu/for-next' git bisect bad aa6ce92d60439f2d2af8879350e4cae414b7f23b # 19:31 0- 38 Merge remote-tracking branch 'workqueues/for-next' git bisect bad 84604340d034a074036e86e85c4055a1c7ea5529 # 19:32 0- 39 workqueue: Fix workqueue lockdep name # first bad commit: [84604340d034a074036e86e85c4055a1c7ea5529] workqueue: Fix workqueue lockdep name git bisect good 38dbfb59d1175ef458d006556061adeaa8751b72 # 20:35 93+ 243 Linus 3.14-rc1 git bisect bad 460217583c934110865a2f5dce5e1b5c98835a46 # 20:35 0- 29 Add linux-next specific files for 20140212 git bisect good 5af25fcc4384df9e5558f46bb93fca3e0d760a97 # 21:03 93+ 93 Revert "workqueue: Fix workqueue lockdep name" git bisect bad ca033390a537dacdc2127c66d62e7862ad15ffdb # 22:00 92- 93 Merge tag 'usb-3.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb git bisect good da8d308fbdb8360078786b3e125238122c4fc611 # 03:19 940+ 940 Add linux-next specific files for 20140214 Thanks, Fengguang