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Date: Fri, 02 Sep 2011 16:26:14 +0530
From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
CC: linux-pm@...ts.linux-foundation.org
Subject: [BUG] CPU hotplug, suspend: Possible circular locking dependency
detected
Hi,
While running CPU hotplug stress test + kernel compilation + pm_test (at the core level),
unsafe locking scenarios are detected.
Kernel version : 3.1.0-rc2
A bug has been opened in the kernel bugzilla regarding this:
https://bugzilla.kernel.org/show_bug.cgi?id=42242
The entire log has been attached with this mail.
[ 807.775666] =======================================================
[ 807.775994] [ INFO: possible circular locking dependency detected ]
[ 807.776253] 3.1.0-rc2 #1
[ 807.776364] -------------------------------------------------------
[ 807.776621] kworker/u:6/29543 is trying to acquire lock:
[ 807.776915] (alc_key){..-...}, at: [<ffffffff81168fa9>] kmem_cache_free+0x1a9/0x240
[ 807.777415]
[ 807.777417] but task is already holding lock:
[ 807.777816] (&(&parent->list_lock)->rlock){-.-...}, at: [<ffffffff81169294>] __drain_alien_cache+0x64/0xa0
[ 807.778398]
[ 807.778399] which lock already depends on the new lock.
[ 807.778401]
[ 807.778975]
[ 807.778976] the existing dependency chain (in reverse order) is:
[ 807.779425]
[ 807.779426] -> #1 (&(&parent->list_lock)->rlock){-.-...}:
[ 807.779891] [<ffffffff810ab50c>] validate_chain+0x6cc/0x7d0
[ 807.780227] [<ffffffff810ab914>] __lock_acquire+0x304/0x500
[ 807.780557] [<ffffffff810ac1d2>] lock_acquire+0xa2/0x130
[ 807.780877] [<ffffffff815349b6>] _raw_spin_lock+0x36/0x70
[ 807.781208] [<ffffffff81169294>] __drain_alien_cache+0x64/0xa0
[ 807.781548] [<ffffffff811698cb>] kfree+0x1db/0x2a0
[ 807.781847] [<ffffffff81169a21>] free_alien_cache+0x91/0xa0
[ 807.782178] [<ffffffff8152e9b9>] cpuup_prepare+0x168/0x1a9
[ 807.782507] [<ffffffff8152ea2f>] cpuup_callback+0x35/0xc5
[ 807.782829] [<ffffffff815393a4>] notifier_call_chain+0x94/0xd0
[ 807.783173] [<ffffffff8109770e>] __raw_notifier_call_chain+0xe/0x10
[ 807.783535] [<ffffffff8106d000>] __cpu_notify+0x20/0x40
[ 807.783858] [<ffffffff8152cf02>] _cpu_up+0x6e/0x10e
[ 807.784172] [<ffffffff8152d07b>] cpu_up+0xd9/0xec
[ 807.784468] [<ffffffff81e21bd6>] smp_init+0x41/0x96
[ 807.784771] [<ffffffff81e03791>] kernel_init+0x1ef/0x2a6
[ 807.785092] [<ffffffff81540184>] kernel_thread_helper+0x4/0x10
[ 807.785433]
[ 807.785434] -> #0 (alc_key){..-...}:
[ 807.785824] [<ffffffff810aae18>] check_prev_add+0x528/0x550
[ 807.786156] [<ffffffff810ab50c>] validate_chain+0x6cc/0x7d0
[ 807.786488] [<ffffffff810ab914>] __lock_acquire+0x304/0x500
[ 807.786823] [<ffffffff810ac1d2>] lock_acquire+0xa2/0x130
[ 807.787143] [<ffffffff815349b6>] _raw_spin_lock+0x36/0x70
[ 807.787467] [<ffffffff81168fa9>] kmem_cache_free+0x1a9/0x240
[ 807.787802] [<ffffffff81169094>] slab_destroy+0x54/0x80
[ 807.788123] [<ffffffff8116911d>] free_block+0x5d/0x170
[ 807.788439] [<ffffffff811692bc>] __drain_alien_cache+0x8c/0xa0
[ 807.788778] [<ffffffff811698cb>] kfree+0x1db/0x2a0
[ 807.789087] [<ffffffff8144aeb0>] skb_release_data+0xd0/0x100
[ 807.789426] [<ffffffff8144aefe>] __kfree_skb+0x1e/0xa0
[ 807.789741] [<ffffffff8144afb1>] consume_skb+0x31/0x80
[ 807.790058] [<ffffffffa01d4e74>] bnx2_free_skbs+0x234/0x390 [bnx2]
[ 807.790416] [<ffffffffa01d5096>] bnx2_suspend+0xc6/0xe0 [bnx2]
[ 807.790758] [<ffffffff812978a6>] pci_legacy_suspend+0x46/0xe0
[ 807.791101] [<ffffffff8129854d>] pci_pm_freeze+0xad/0xd0
[ 807.791422] [<ffffffff8135e7f6>] pm_op+0x136/0x1a0
[ 807.791724] [<ffffffff8135f18b>] __device_suspend+0x26b/0x2d0
[ 807.792063] [<ffffffff8136016f>] async_suspend+0x1f/0xa0
[ 807.792384] [<ffffffff81099634>] async_run_entry_fn+0x84/0x160
[ 807.792726] [<ffffffff8108938a>] process_one_work+0x1aa/0x520
[ 807.793065] [<ffffffff8108ba7b>] worker_thread+0x17b/0x3b0
[ 807.793394] [<ffffffff81090af6>] kthread+0xb6/0xc0
[ 807.793698] [<ffffffff81540184>] kernel_thread_helper+0x4/0x10
[ 807.794041]
[ 807.794042] other info that might help us debug this:
[ 807.794043]
[ 807.794602] Possible unsafe locking scenario:
[ 807.794603]
[ 807.794995] CPU0 CPU1
[ 807.795250] ---- ----
[ 807.795505] lock(&(&parent->list_lock)->rlock);
[ 807.795789] lock(alc_key);
[ 807.796101] lock(&(&parent->list_lock)->rlock);
[ 807.796557] lock(alc_key);
[ 807.796771]
[ 807.796772] *** DEADLOCK ***
[ 807.796773]
[ 807.797252] 5 locks held by kworker/u:6/29543:
[ 807.797503] #0: (events_unbound){.+.+.+}, at: [<ffffffff8108931d>] process_one_work+0x13d/0x520
[ 807.798058] #1: ((&entry->work)){+.+.+.}, at: [<ffffffff8108931d>] process_one_work+0x13d/0x520
[ 807.798591] #2: (&__lockdep_no_validate__){......}, at: [<ffffffff8135efc3>] __device_suspend+0xa3/0x2d0
[ 807.799160] #3: (&(&nc->lock)->rlock){-.-...}, at: [<ffffffff811698b4>] kfree+0x1c4/0x2a0
[ 807.799672] #4: (&(&parent->list_lock)->rlock){-.-...}, at: [<ffffffff81169294>] __drain_alien_cache+0x64/0xa0
[ 807.800270]
[ 807.800271] stack backtrace:
[ 807.800608] Pid: 29543, comm: kworker/u:6 Not tainted 3.1.0-rc2 #1
[ 807.800929] Call Trace:
[ 807.801115] [<ffffffff810a8e39>] print_circular_bug+0x109/0x110
[ 807.801428] [<ffffffff810aae18>] check_prev_add+0x528/0x550
[ 807.801728] [<ffffffff810ab50c>] validate_chain+0x6cc/0x7d0
[ 807.802040] [<ffffffff8101a3f9>] ? sched_clock+0x9/0x10
[ 807.802327] [<ffffffff8109839d>] ? sched_clock_cpu+0xcd/0x110
[ 807.802635] [<ffffffff810ab914>] __lock_acquire+0x304/0x500
[ 807.802938] [<ffffffff810ac1d2>] lock_acquire+0xa2/0x130
[ 807.803230] [<ffffffff81168fa9>] ? kmem_cache_free+0x1a9/0x240
[ 807.803541] [<ffffffff815349b6>] _raw_spin_lock+0x36/0x70
[ 807.803835] [<ffffffff81168fa9>] ? kmem_cache_free+0x1a9/0x240
[ 807.804147] [<ffffffff81168fa9>] kmem_cache_free+0x1a9/0x240
[ 807.804453] [<ffffffff81169094>] slab_destroy+0x54/0x80
[ 807.804740] [<ffffffff8116911d>] free_block+0x5d/0x170
[ 807.805027] [<ffffffff811692bc>] __drain_alien_cache+0x8c/0xa0
[ 807.805337] [<ffffffff811698cb>] kfree+0x1db/0x2a0
[ 807.805610] [<ffffffff8144aeb0>] skb_release_data+0xd0/0x100
[ 807.805916] [<ffffffff8144aefe>] __kfree_skb+0x1e/0xa0
[ 807.806201] [<ffffffff8144afb1>] consume_skb+0x31/0x80
[ 807.806487] [<ffffffffa01d4e74>] bnx2_free_skbs+0x234/0x390 [bnx2]
[ 807.806813] [<ffffffffa01d5096>] bnx2_suspend+0xc6/0xe0 [bnx2]
[ 807.807130] [<ffffffff812978a6>] pci_legacy_suspend+0x46/0xe0
[ 807.807445] [<ffffffff8129854d>] pci_pm_freeze+0xad/0xd0
[ 807.807736] [<ffffffff8135e7f6>] pm_op+0x136/0x1a0
[ 807.808015] [<ffffffff8135f18b>] __device_suspend+0x26b/0x2d0
[ 807.808334] [<ffffffff8136016f>] async_suspend+0x1f/0xa0
[ 807.808625] [<ffffffff81099634>] async_run_entry_fn+0x84/0x160
[ 807.808943] [<ffffffff8108938a>] process_one_work+0x1aa/0x520
[ 807.809255] [<ffffffff8108931d>] ? process_one_work+0x13d/0x520
[ 807.809568] [<ffffffff810995b0>] ? async_schedule+0x20/0x20
[ 807.809870] [<ffffffff8108ba7b>] worker_thread+0x17b/0x3b0
[ 807.810167] [<ffffffff8108b900>] ? manage_workers+0x120/0x120
[ 807.810476] [<ffffffff81090af6>] kthread+0xb6/0xc0
[ 807.810746] [<ffffffff810aa5fd>] ? trace_hardirqs_on_caller+0x10d/0x1a0
[ 807.811092] [<ffffffff81540184>] kernel_thread_helper+0x4/0x10
[ 807.811404] [<ffffffff81535774>] ? retint_restore_args+0x13/0x13
[ 807.811723] [<ffffffff81090a40>] ? __init_kthread_worker+0x70/0x70
[ 807.812053] [<ffffffff81540180>] ? gs_change+0x13/0x13
--
Regards,
Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Linux Technology Center,
IBM India Systems and Technology Lab
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