linux-kernel - MPTSAS problems in 2.6.26-rc2-mm1

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Date:	Wed, 28 May 2008 15:11:25 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	linux-scsi@...r.kernel.org
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: MPTSAS problems in 2.6.26-rc2-mm1

I have 2.6.26-rc2-mm1 with Rik's splitvm patches. While booting the kernel, I
ran into the following. I searched my email quickly to see that no one else has
reported this problem. Lockdep seems to be complaining about the same lock being
held at the same location (the message is a bit confusing to me).


=============================================
[ INFO: possible recursive locking detected ]
2.6.26-rc2-mm1 #2
---------------------------------------------
insmod/1072 is trying to acquire lock:
 (&cls->mutex){--..}, at: [<ffffffff803eb2cc>] device_add+0x46e/0x5d7

but task is already holding lock:
 (&cls->mutex){--..}, at: [<ffffffff803eb2cc>] device_add+0x46e/0x5d7

other info that might help us debug this:
3 locks held by insmod/1072:
 #0:  (&ioc->sas_discovery_mutex){--..}, at: [<ffffffffa003e7e9>]
mptsas_probe+0x3a1/0x442 [mptsas]
 #1:  (&shost->scan_mutex){--..}, at: [<ffffffff80466cbd>]
scsi_scan_target+0x71/0xb0
 #2:  (&cls->mutex){--..}, at: [<ffffffff803eb2cc>] device_add+0x46e/0x5d7

stack backtrace:
Pid: 1072, comm: insmod Not tainted 2.6.26-rc2-mm1 #2

Call Trace:
 [<ffffffff80254545>] __lock_acquire+0x911/0xc4c
 [<ffffffff80254835>] ? __lock_acquire+0xc01/0xc4c
 [<ffffffff803eb2cc>] ? device_add+0x46e/0x5d7
 [<ffffffff8025490e>] lock_acquire+0x8e/0xb2
 [<ffffffff803eb2cc>] ? device_add+0x46e/0x5d7
 [<ffffffff8059e067>] mutex_lock_nested+0xf2/0x27f
 [<ffffffff803eb2cc>] ? device_add+0x46e/0x5d7
 [<ffffffff8059f80b>] ? _spin_unlock+0x26/0x2a
 [<ffffffff803eb2cc>] device_add+0x46e/0x5d7
 [<ffffffff803eb44e>] device_register+0x19/0x1d
 [<ffffffff803eb531>] device_create+0xdf/0x110
 [<ffffffff80253794>] ? trace_hardirqs_on_caller+0xf9/0x124
 [<ffffffff802537cc>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff8059df73>] ? mutex_unlock+0x9/0xb
 [<ffffffff803eed13>] ? kobj_map+0x119/0x12e
 [<ffffffff802a4488>] ? exact_lock+0x0/0x14
 [<ffffffff802a4364>] ? exact_match+0x0/0x9
 [<ffffffff80488bb4>] sg_add+0x262/0x394
 [<ffffffff8059f80b>] ? _spin_unlock+0x26/0x2a
 [<ffffffff803eb31b>] device_add+0x4bd/0x5d7
 [<ffffffff80467d9b>] scsi_sysfs_add_sdev+0xde/0x200
 [<ffffffff80465feb>] scsi_probe_and_add_lun+0x847/0x977
 [<ffffffff8046639d>] __scsi_scan_target+0xbf/0x522
 [<ffffffff80253794>] ? trace_hardirqs_on_caller+0xf9/0x124
 [<ffffffff80250b9d>] ? debug_mutex_free_waiter+0x46/0x4a
 [<ffffffff8059e1e5>] ? mutex_lock_nested+0x270/0x27f
 [<ffffffff80466cbd>] ? scsi_scan_target+0x71/0xb0
 [<ffffffff80466ce8>] scsi_scan_target+0x9c/0xb0
 [<ffffffffa001ad60>] :scsi_transport_sas:sas_rphy_add+0x14c/0x15b
 [<ffffffffa003cc17>] :mptsas:mptsas_probe_one_phy+0x364/0x3a9
 [<ffffffffa003d651>] :mptsas:mptsas_probe_hba_phys+0x5bb/0x614
 [<ffffffffa0028aeb>] ? :mptbase:mpt_timer_expired+0x0/0x2e
 [<ffffffffa0028aeb>] ? :mptbase:mpt_timer_expired+0x0/0x2e
 [<ffffffffa0028aeb>] ? :mptbase:mpt_timer_expired+0x0/0x2e
 [<ffffffffa003e7f1>] :mptsas:mptsas_probe+0x3a9/0x442
 [<ffffffff8039126a>] pci_device_probe+0xbd/0x116
 [<ffffffff803ed1f0>] driver_probe_device+0xdb/0x162
 [<ffffffff803ed2c6>] __driver_attach+0x4f/0x79
 [<ffffffff803ed277>] ? __driver_attach+0x0/0x79
 [<ffffffff803ec832>] bus_for_each_dev+0x4d/0x7e
 [<ffffffff803ed01c>] driver_attach+0x1c/0x1e
 [<ffffffff803eccc0>] bus_add_driver+0xba/0x212
 [<ffffffff803ed4a6>] driver_register+0x93/0x10a
 [<ffffffff80391526>] __pci_register_driver+0x73/0xad
 [<ffffffffa00450e2>] :mptsas:mptsas_init+0xe2/0xfa
 [<ffffffff8025c25e>] sys_init_module+0x9e/0x1b2
 [<ffffffff8020b20b>] system_call_after_swapgs+0x7b/0x80



-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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