Messages in this thread | | | Date | Fri, 19 Aug 2011 17:57:54 -0400 | From | Dave Jones <> | Subject | 3.1.0-rc2 block related lockdep report. |
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Just got this while running kvm. (this is from the host)
Dave
================================= [ INFO: inconsistent lock state ] 3.1.0-rc2+ #139 --------------------------------- inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage. qemu-kvm/8194 [HC0[0]:SC0[0]:HE1:SE1] takes: (pcpu_alloc_mutex){+.+.?.}, at: [<ffffffff81110b78>] pcpu_alloc+0x6f/0x80b {RECLAIM_FS-ON-W} state was registered at: [<ffffffff8109138e>] mark_held_locks+0x6d/0x95 [<ffffffff810919a9>] lockdep_trace_alloc+0x9f/0xc2 [<ffffffff8113168c>] slab_pre_alloc_hook+0x1e/0x4f [<ffffffff81133c16>] __kmalloc+0x64/0x12f [<ffffffff81110164>] pcpu_mem_alloc+0x5e/0x67 [<ffffffff8111026b>] pcpu_extend_area_map+0x2b/0xd4 [<ffffffff81110cc8>] pcpu_alloc+0x1bf/0x80b [<ffffffff81111324>] __alloc_percpu+0x10/0x12 [<ffffffff81135651>] kmem_cache_open+0x2cc/0x2d6 [<ffffffff81135834>] kmem_cache_create+0x1d9/0x281 [<ffffffff812bcd01>] acpi_os_create_cache+0x1d/0x2d [<ffffffff812e4d26>] acpi_ut_create_caches+0x26/0xb0 [<ffffffff812e76d2>] acpi_ut_init_globals+0xe/0x244 [<ffffffff81d7881f>] acpi_initialize_subsystem+0x35/0xae [<ffffffff81d77539>] acpi_early_init+0x5c/0xf7 [<ffffffff81d48b9e>] start_kernel+0x3dd/0x3f7 [<ffffffff81d482c4>] x86_64_start_reservations+0xaf/0xb3 [<ffffffff81d483ca>] x86_64_start_kernel+0x102/0x111 irq event stamp: 140939 hardirqs last enabled at (140939): [<ffffffff814e1c55>] __slab_alloc+0x41c/0x43d hardirqs last disabled at (140938): [<ffffffff814e187e>] __slab_alloc+0x45/0x43d softirqs last enabled at (140484): [<ffffffff8106481f>] __do_softirq+0x1fd/0x257 softirqs last disabled at (140461): [<ffffffff814f19fc>] call_softirq+0x1c/0x30
other info that might help us debug this: Possible unsafe locking scenario:
CPU0 ---- lock(pcpu_alloc_mutex); <Interrupt> lock(pcpu_alloc_mutex);
*** DEADLOCK ***
1 lock held by qemu-kvm/8194: #0: (&mm->mmap_sem){++++++}, at: [<ffffffff814ec328>] do_page_fault+0x188/0x39d
stack backtrace: Pid: 8194, comm: qemu-kvm Tainted: G W 3.1.0-rc2+ #139 Call Trace: [<ffffffff81081031>] ? up+0x39/0x3e [<ffffffff814dea37>] print_usage_bug+0x1e7/0x1f8 [<ffffffff8101bb8d>] ? save_stack_trace+0x2c/0x49 [<ffffffff8108f65a>] ? print_irq_inversion_bug.part.19+0x1a0/0x1a0 [<ffffffff8108fd88>] mark_lock+0x106/0x220 [<ffffffff81090236>] __lock_acquire+0x394/0xcf7 [<ffffffff814e9318>] ? _raw_spin_unlock+0x32/0x54 [<ffffffff814e932d>] ? _raw_spin_unlock+0x47/0x54 [<ffffffff811339d2>] ? deactivate_slab+0x293/0x2b9 [<ffffffff81110b78>] ? pcpu_alloc+0x6f/0x80b [<ffffffff8109108f>] lock_acquire+0xf3/0x13e [<ffffffff81110b78>] ? pcpu_alloc+0x6f/0x80b [<ffffffff814e7c9d>] ? mutex_lock_nested+0x3b/0x40 [<ffffffff81110b78>] ? pcpu_alloc+0x6f/0x80b [<ffffffff814e77bd>] __mutex_lock_common+0x65/0x44a [<ffffffff81110b78>] ? pcpu_alloc+0x6f/0x80b [<ffffffff810914e3>] ? trace_hardirqs_on_caller+0x12d/0x164 [<ffffffff814e1c61>] ? __slab_alloc+0x428/0x43d [<ffffffff81266500>] ? kzalloc_node+0x14/0x16 [<ffffffff814e7c9d>] mutex_lock_nested+0x3b/0x40 [<ffffffff81110b78>] pcpu_alloc+0x6f/0x80b [<ffffffff81266500>] ? kzalloc_node+0x14/0x16 [<ffffffff81133b8b>] ? __kmalloc_node+0x146/0x16d [<ffffffff81266500>] ? kzalloc_node+0x14/0x16 [<ffffffff81111324>] __alloc_percpu+0x10/0x12 [<ffffffff81264fab>] blkio_alloc_blkg_stats+0x1d/0x31 [<ffffffff8126653c>] throtl_alloc_tg+0x3a/0xdf [<ffffffff81266f4e>] blk_throtl_bio+0x14b/0x38e [<ffffffff81016224>] ? __cycles_2_ns+0xe/0x3a [<ffffffff8108202e>] ? local_clock+0x14/0x4c [<ffffffff810164da>] ? native_sched_clock+0x34/0x36 [<ffffffff81259e7a>] generic_make_request+0x2e8/0x419 [<ffffffff814e937f>] ? _raw_spin_unlock_irqrestore+0x45/0x7a [<ffffffff810fd7a7>] ? test_set_page_writeback+0xcc/0xfd [<ffffffff8125a089>] submit_bio+0xde/0xfd [<ffffffff810fd441>] ? account_page_writeback+0x13/0x15 [<ffffffff810fd7c6>] ? test_set_page_writeback+0xeb/0xfd [<ffffffff81122161>] swap_writepage+0x94/0x9f [<ffffffff811082b1>] shmem_writepage+0x192/0x1d8 [<ffffffff811056b6>] shrink_page_list+0x402/0x795 [<ffffffff81105e82>] shrink_inactive_list+0x22c/0x3e6 [<ffffffff8109138e>] ? mark_held_locks+0x6d/0x95 [<ffffffff81106755>] shrink_zone+0x445/0x588 [<ffffffff81168463>] ? wakeup_flusher_threads+0xcf/0xd8 [<ffffffff811683c6>] ? wakeup_flusher_threads+0x32/0xd8 [<ffffffff81106c0d>] do_try_to_free_pages+0x107/0x318 [<ffffffff811071a1>] try_to_free_pages+0xd5/0x175 [<ffffffff810fcfff>] __alloc_pages_nodemask+0x501/0x7b7 [<ffffffff810dc435>] ? trace_preempt_on+0x15/0x28 [<ffffffff8108de9e>] ? lock_release_holdtime.part.10+0x59/0x62 [<ffffffff8112bdbc>] alloc_pages_vma+0xf5/0xfa [<ffffffff8113b4be>] do_huge_pmd_anonymous_page+0xb3/0x274 [<ffffffff8111226b>] ? pmd_offset+0x19/0x3f [<ffffffff8111547f>] handle_mm_fault+0xfd/0x1b8 [<ffffffff814ec328>] ? do_page_fault+0x188/0x39d [<ffffffff814ec4f6>] do_page_fault+0x356/0x39d [<ffffffff8108fcaf>] ? mark_lock+0x2d/0x220 [<ffffffff810dc40c>] ? time_hardirqs_off+0x1b/0x2f [<ffffffff8108d8ff>] ? trace_hardirqs_off_caller+0x3f/0x9c [<ffffffff81279dfd>] ? trace_hardirqs_off_thunk+0x3a/0x3c [<ffffffff814e9d25>] page_fault+0x25/0x30 [<ffffffff810f4d23>] ? file_read_actor+0x39/0x12a [<ffffffff810f6d60>] generic_file_aio_read+0x3fd/0x655 [<ffffffff81016224>] ? __cycles_2_ns+0xe/0x3a [<ffffffff8108202e>] ? local_clock+0x14/0x4c [<ffffffff81145359>] do_sync_read+0xbf/0xff [<ffffffff812282b9>] ? security_file_permission+0x2e/0x33 [<ffffffff811456cc>] ? rw_verify_area+0xb6/0xd3 [<ffffffff81145a59>] vfs_read+0xac/0xf3 [<ffffffff81146fe1>] ? fget_light+0x97/0xa2 [<ffffffff81145be5>] sys_pread64+0x5d/0x79 [<ffffffff814ef702>] system_call_fastpath+0x16/0x1b
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