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Date: Wed, 3 Aug 2011 15:12:17 -0400
From: Dave Jones <davej@...hat.com>
To: Linux Kernel <linux-kernel@...r.kernel.org>
Cc: dwmw2@...radead.org
Subject: iommu lockdep trace on 3.0.0
(it says 2.6.40, but it's 3.0.0 in all but name)
Hit this while booting.
Dave
[ 706.848926] =======================================================
[ 706.857477] [ INFO: possible circular locking dependency detected ]
[ 706.863738] 2.6.40-4.fc15.x86_64.debug #1
[ 706.867746] -------------------------------------------------------
[ 706.874058] modprobe/1702 is trying to acquire lock:
[ 706.879047] (&(&iommu->lock)->rlock){......}, at: [<ffffffff8128d308>] domain_remove_one_dev_info+0x1c1/0x20b
[ 706.889143]
[ 706.889144] but task is already holding lock:
[ 706.895029] (device_domain_lock){..-...}, at: [<ffffffff8128d279>] domain_remove_one_dev_info+0x132/0x20b
[ 706.904795]
[ 706.904796] which lock already depends on the new lock.
[ 706.904798]
[ 706.913062]
[ 706.913063] the existing dependency chain (in reverse order) is:
[ 706.920608]
[ 706.920609] -> #1 (device_domain_lock){..-...}:
[ 706.926744] [<ffffffff8108ab96>] lock_acquire+0xbf/0x103
[ 706.932684] [<ffffffff814f6c77>] _raw_spin_lock_irqsave+0x45/0x7f
[ 706.939408] [<ffffffff8128c16b>] domain_context_mapping_one+0x2b7/0x49a
[ 706.946695] [<ffffffff8128d6c8>] domain_context_mapping+0x3d/0xe5
[ 706.953437] [<ffffffff814f2097>] iommu_prepare_identity_map+0x18f/0x1ae
[ 706.960718] [<ffffffff81d74d18>] intel_iommu_init+0x7f0/0xa9d
[ 706.967132] [<ffffffff81d4c0d0>] pci_iommu_init+0x29/0x54
[ 706.973166] [<ffffffff81002099>] do_one_initcall+0x7f/0x13a
[ 706.979372] [<ffffffff81d44c98>] kernel_init+0xdf/0x159
[ 706.985266] [<ffffffff814ff0a4>] kernel_thread_helper+0x4/0x10
[ 707.054277]
[ 707.054278] -> #0 (&(&iommu->lock)->rlock){......}:
[ 707.061381] [<ffffffff8108a42c>] __lock_acquire+0xa1a/0xcf7
[ 707.067580] [<ffffffff8108ab96>] lock_acquire+0xbf/0x103
[ 707.074883] [<ffffffff814f6c77>] _raw_spin_lock_irqsave+0x45/0x7f
[ 707.081583] [<ffffffff8128d308>] domain_remove_one_dev_info+0x1c1/0x20b
[ 707.090185] [<ffffffff8128d9aa>] device_notifier+0x54/0x7e
[ 707.097489] [<ffffffff814fa9a4>] notifier_call_chain+0x84/0xbb
[ 707.103938] [<ffffffff8107b16c>] __blocking_notifier_call_chain+0x67/0x84
[ 707.111380] [<ffffffff8107b19d>] blocking_notifier_call_chain+0x14/0x16
[ 707.119981] [<ffffffff81326492>] __device_release_driver+0xcd/0xd2
[ 707.127814] [<ffffffff81326b4f>] driver_detach+0x99/0xc2
[ 707.133769] [<ffffffff8132630f>] bus_remove_driver+0xba/0xdf
[ 707.140200] [<ffffffff813271f5>] driver_unregister+0x6a/0x75
[ 707.146468] [<ffffffff81279592>] pci_unregister_driver+0x44/0x8d
[ 707.163869] [<ffffffff81094039>] sys_delete_module+0x1dd/0x251
[ 707.170319] [<ffffffff814fdf02>] system_call_fastpath+0x16/0x1b
[ 707.177535]
[ 707.177536] other info that might help us debug this:
[ 707.177537]
[ 707.185549] Possible unsafe locking scenario:
[ 707.185550]
[ 707.191498] CPU0 CPU1
[ 707.196043] ---- ----
[ 707.200574] lock(device_domain_lock);
[ 707.204505] lock(&(&iommu->lock)->rlock);
[ 707.211266] lock(device_domain_lock);
[ 707.217679] lock(&(&iommu->lock)->rlock);
[ 707.221933]
[ 707.221934] *** DEADLOCK ***
[ 707.221935]
[ 707.227943] 4 locks held by modprobe/1702:
[ 707.232066] #0: (&__lockdep_no_validate__){+.+.+.}, at: [<ffffffff81326b30>] driver_detach+0x7a/0xc2
[ 707.241488] #1: (&__lockdep_no_validate__){+.+.+.}, at: [<ffffffff81326b3e>] driver_detach+0x88/0xc2
[ 707.250961] #2: (&(&priv->bus_notifier)->rwsem){.+.+.+}, at: [<ffffffff8107b154>] __blocking_notifier_call_chain+0x4f/0x84
[ 707.262303] #3: (device_domain_lock){..-...}, at: [<ffffffff8128d279>] domain_remove_one_dev_info+0x132/0x20b
[ 707.272494]
[ 707.272495] stack backtrace:
[ 707.276915] Pid: 1702, comm: modprobe Not tainted 2.6.40-4.fc15.x86_64.debug #1
[ 707.284208] Call Trace:
[ 707.286697] [<ffffffff814ed313>] print_circular_bug+0x1f8/0x209
[ 707.292692] [<ffffffff8108a42c>] __lock_acquire+0xa1a/0xcf7
[ 707.298363] [<ffffffff8128d308>] ? domain_remove_one_dev_info+0x1c1/0x20b
[ 707.305226] [<ffffffff8108ab96>] lock_acquire+0xbf/0x103
[ 707.310619] [<ffffffff8128d308>] ? domain_remove_one_dev_info+0x1c1/0x20b
[ 707.324019] [<ffffffff814f6c77>] _raw_spin_lock_irqsave+0x45/0x7f
[ 707.330219] [<ffffffff8128d308>] ? domain_remove_one_dev_info+0x1c1/0x20b
[ 707.337082] [<ffffffff810874ea>] ? trace_hardirqs_off+0xd/0xf
[ 707.342933] [<ffffffff8128d308>] domain_remove_one_dev_info+0x1c1/0x20b
[ 707.349624] [<ffffffff8128d9aa>] device_notifier+0x54/0x7e
[ 707.355216] [<ffffffff814fa9a4>] notifier_call_chain+0x84/0xbb
[ 707.361129] [<ffffffff8107b16c>] __blocking_notifier_call_chain+0x67/0x84
[ 707.368021] [<ffffffff8107b19d>] blocking_notifier_call_chain+0x14/0x16
[ 707.374710] [<ffffffff81326492>] __device_release_driver+0xcd/0xd2
[ 707.380995] [<ffffffff81326b4f>] driver_detach+0x99/0xc2
[ 707.386390] [<ffffffff8132630f>] bus_remove_driver+0xba/0xdf
[ 707.392163] [<ffffffff813271f5>] driver_unregister+0x6a/0x75
[ 707.397904] [<ffffffff81279592>] pci_unregister_driver+0x44/0x8d
[ 707.410102] [<ffffffff81094039>] sys_delete_module+0x1dd/0x251
[ 707.416014] [<ffffffff814f7739>] ? retint_swapgs+0x13/0x1b
[ 707.421582] [<ffffffff810aff1d>] ? audit_syscall_entry+0x11c/0x148
[ 707.427840] [<ffffffff8126089e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 707.434297] [<ffffffff814fdf02>] system_call_fastpath+0x16/0x1b
--
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