btrfs "possible irq lock inversion dependency detected"
From: Tommi Rantala
Date: Mon Feb 17 2014 - 15:11:08 EST
Hello,
Saw this while fuzzing the kernel with Trinity.
Tommi
[ 396.136048] =========================================================
[ 396.136048] [ INFO: possible irq lock inversion dependency detected ]
[ 396.136048] 3.14.0-rc3 #1 Not tainted
[ 396.136048] ---------------------------------------------------------
[ 396.136048] kswapd0/1482 just changed the state of lock:
[ 396.136048] (&delayed_node->mutex){+.+.-.}, at: [<ffffffff8147b83b>] __btrfs_release_delayed_node+0x4b/0x1e0
[ 396.136048] but this lock took another, RECLAIM_FS-unsafe lock in the past:
[ 396.136048] (&found->groups_sem){+++++.}
and interrupts could create inverse lock ordering between them.
[ 396.136048]
[ 396.136048] other info that might help us debug this:
[ 396.136048] Possible interrupt unsafe locking scenario:
[ 396.136048]
[ 396.136048] CPU0 CPU1
[ 396.136048] ---- ----
[ 396.136048] lock(&found->groups_sem);
[ 396.136048] local_irq_disable();
[ 396.136048] lock(&delayed_node->mutex);
[ 396.136048] lock(&found->groups_sem);
[ 396.136048] <Interrupt>
[ 396.136048] lock(&delayed_node->mutex);
[ 396.136048]
[ 396.136048] *** DEADLOCK ***
[ 396.136048]
[ 396.136048] 2 locks held by kswapd0/1482:
[ 396.136048] #0: (shrinker_rwsem){++++..}, at: [<ffffffff8122642a>] shrink_slab+0x3a/0x170
[ 396.136048] #1: (&type->s_umount_key#25){++++.+}, at: [<ffffffff8127736f>] grab_super_passive+0x4f/0x80
[ 396.136048]
[ 396.136048] the shortest dependencies between 2nd lock and 1st lock:
[ 396.136048] -> (&found->groups_sem){+++++.} ops: 38935 {
[ 396.136048] HARDIRQ-ON-W at:
[ 396.136048] [<ffffffff811939de>] __lock_acquire+0x88e/0x1d90
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff8237c62c>] down_write+0x5c/0xc0
[ 396.136048] [<ffffffff81413f9d>] __link_block_group+0x3d/0xf0
[ 396.136048] [<ffffffff81418232>] btrfs_read_block_groups+0x392/0x690
[ 396.136048] [<ffffffff81426ba7>] open_ctree+0x1ad7/0x2140
[ 396.136048] [<ffffffff813fadbe>] btrfs_mount+0x44e/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff813fb1a1>] btrfs_mount+0x831/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff8129a7f4>] do_mount+0x954/0xb90
[ 396.136048] [<ffffffff8129ad04>] SyS_mount+0x94/0xe0
[ 396.136048] [<ffffffff82ff539a>] do_mount_root+0x1a/0x93
[ 396.136048] [<ffffffff82ff54f8>] mount_block_root+0xe5/0x203
[ 396.136048] [<ffffffff82ff56f7>] mount_root+0xe1/0xea
[ 396.136048] [<ffffffff82ff583c>] prepare_namespace+0x13c/0x174
[ 396.136048] [<ffffffff82ff52a7>] kernel_init_freeable+0x242/0x251
[ 396.136048] [<ffffffff82355509>] kernel_init+0x9/0xf0
[ 396.136048] [<ffffffff8237f14c>] ret_from_fork+0x7c/0xb0
[ 396.136048] HARDIRQ-ON-R at:
[ 396.136048] [<ffffffff81193997>] __lock_acquire+0x847/0x1d90
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff8237c57c>] down_read+0x4c/0xa0
[ 396.136048] [<ffffffff8142327a>] btrfs_calc_num_tolerated_disk_barrier_failures+0x24a/0x310
[ 396.136048] [<ffffffff81426bdf>] open_ctree+0x1b0f/0x2140
[ 396.136048] [<ffffffff813fadbe>] btrfs_mount+0x44e/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff813fb1a1>] btrfs_mount+0x831/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff8129a7f4>] do_mount+0x954/0xb90
[ 396.136048] [<ffffffff8129ad04>] SyS_mount+0x94/0xe0
[ 396.136048] [<ffffffff82ff539a>] do_mount_root+0x1a/0x93
[ 396.136048] [<ffffffff82ff54f8>] mount_block_root+0xe5/0x203
[ 396.136048] [<ffffffff82ff56f7>] mount_root+0xe1/0xea
[ 396.136048] [<ffffffff82ff583c>] prepare_namespace+0x13c/0x174
[ 396.136048] [<ffffffff82ff52a7>] kernel_init_freeable+0x242/0x251
[ 396.136048] [<ffffffff82355509>] kernel_init+0x9/0xf0
[ 396.136048] [<ffffffff8237f14c>] ret_from_fork+0x7c/0xb0
[ 396.136048] SOFTIRQ-ON-W at:
[ 396.136048] [<ffffffff81193a13>] __lock_acquire+0x8c3/0x1d90
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff8237c62c>] down_write+0x5c/0xc0
[ 396.136048] [<ffffffff81413f9d>] __link_block_group+0x3d/0xf0
[ 396.136048] [<ffffffff81418232>] btrfs_read_block_groups+0x392/0x690
[ 396.136048] [<ffffffff81426ba7>] open_ctree+0x1ad7/0x2140
[ 396.136048] [<ffffffff813fadbe>] btrfs_mount+0x44e/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff813fb1a1>] btrfs_mount+0x831/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff8129a7f4>] do_mount+0x954/0xb90
[ 396.136048] [<ffffffff8129ad04>] SyS_mount+0x94/0xe0
[ 396.136048] [<ffffffff82ff539a>] do_mount_root+0x1a/0x93
[ 396.136048] [<ffffffff82ff54f8>] mount_block_root+0xe5/0x203
[ 396.136048] [<ffffffff82ff56f7>] mount_root+0xe1/0xea
[ 396.136048] [<ffffffff82ff583c>] prepare_namespace+0x13c/0x174
[ 396.136048] [<ffffffff82ff52a7>] kernel_init_freeable+0x242/0x251
[ 396.136048] [<ffffffff82355509>] kernel_init+0x9/0xf0
[ 396.136048] [<ffffffff8237f14c>] ret_from_fork+0x7c/0xb0
[ 396.136048] SOFTIRQ-ON-R at:
[ 396.136048] [<ffffffff81193a13>] __lock_acquire+0x8c3/0x1d90
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff8237c57c>] down_read+0x4c/0xa0
[ 396.136048] [<ffffffff8142327a>] btrfs_calc_num_tolerated_disk_barrier_failures+0x24a/0x310
[ 396.136048] [<ffffffff81426bdf>] open_ctree+0x1b0f/0x2140
[ 396.136048] [<ffffffff813fadbe>] btrfs_mount+0x44e/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff813fb1a1>] btrfs_mount+0x831/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff8129a7f4>] do_mount+0x954/0xb90
[ 396.136048] [<ffffffff8129ad04>] SyS_mount+0x94/0xe0
[ 396.136048] [<ffffffff82ff539a>] do_mount_root+0x1a/0x93
[ 396.136048] [<ffffffff82ff54f8>] mount_block_root+0xe5/0x203
[ 396.136048] [<ffffffff82ff56f7>] mount_root+0xe1/0xea
[ 396.136048] [<ffffffff82ff583c>] prepare_namespace+0x13c/0x174
[ 396.136048] [<ffffffff82ff52a7>] kernel_init_freeable+0x242/0x251
[ 396.136048] [<ffffffff82355509>] kernel_init+0x9/0xf0
[ 396.136048] [<ffffffff8237f14c>] ret_from_fork+0x7c/0xb0
[ 396.136048] RECLAIM_FS-ON-W at:
[ 396.136048] [<ffffffff811917ee>] mark_held_locks+0x12e/0x150
[ 396.136048] [<ffffffff8119207d>] lockdep_trace_alloc+0xdd/0xf0
[ 396.136048] [<ffffffff81268dda>] __kmalloc_track_caller+0x6a/0x2c0
[ 396.136048] [<ffffffff8154886b>] kvasprintf+0x5b/0x90
[ 396.136048] [<ffffffff8153b861>] kobject_set_name_vargs+0x21/0x70
[ 396.136048] [<ffffffff8153c588>] kobject_add+0x88/0xe0
[ 396.136048] [<ffffffff81413ff4>] __link_block_group+0x94/0xf0
[ 396.136048] [<ffffffff81418232>] btrfs_read_block_groups+0x392/0x690
[ 396.136048] [<ffffffff81426ba7>] open_ctree+0x1ad7/0x2140
[ 396.136048] [<ffffffff813fadbe>] btrfs_mount+0x44e/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff813fb1a1>] btrfs_mount+0x831/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff8129a7f4>] do_mount+0x954/0xb90
[ 396.136048] [<ffffffff8129ad04>] SyS_mount+0x94/0xe0
[ 396.136048] [<ffffffff82ff539a>] do_mount_root+0x1a/0x93
[ 396.136048] [<ffffffff82ff54f8>] mount_block_root+0xe5/0x203
[ 396.136048] [<ffffffff82ff56f7>] mount_root+0xe1/0xea
[ 396.136048] [<ffffffff82ff583c>] prepare_namespace+0x13c/0x174
[ 396.136048] [<ffffffff82ff52a7>] kernel_init_freeable+0x242/0x251
[ 396.136048] [<ffffffff82355509>] kernel_init+0x9/0xf0
[ 396.136048] [<ffffffff8237f14c>] ret_from_fork+0x7c/0xb0
[ 396.136048] INITIAL USE at:
[ 396.136048] [<ffffffff81193a97>] __lock_acquire+0x947/0x1d90
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff8237c62c>] down_write+0x5c/0xc0
[ 396.136048] [<ffffffff81413f9d>] __link_block_group+0x3d/0xf0
[ 396.136048] [<ffffffff81418232>] btrfs_read_block_groups+0x392/0x690
[ 396.136048] [<ffffffff81426ba7>] open_ctree+0x1ad7/0x2140
[ 396.136048] [<ffffffff813fadbe>] btrfs_mount+0x44e/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff813fb1a1>] btrfs_mount+0x831/0x8e0
[ 396.136048] [<ffffffff81278a6a>] mount_fs+0x7a/0x1a0
[ 396.136048] [<ffffffff81298221>] vfs_kern_mount+0x71/0x150
[ 396.136048] [<ffffffff8129a7f4>] do_mount+0x954/0xb90
[ 396.136048] [<ffffffff8129ad04>] SyS_mount+0x94/0xe0
[ 396.136048] [<ffffffff82ff539a>] do_mount_root+0x1a/0x93
[ 396.136048] [<ffffffff82ff54f8>] mount_block_root+0xe5/0x203
[ 396.136048] [<ffffffff82ff56f7>] mount_root+0xe1/0xea
[ 396.136048] [<ffffffff82ff583c>] prepare_namespace+0x13c/0x174
[ 396.136048] [<ffffffff82ff52a7>] kernel_init_freeable+0x242/0x251
[ 396.136048] [<ffffffff82355509>] kernel_init+0x9/0xf0
[ 396.136048] [<ffffffff8237f14c>] ret_from_fork+0x7c/0xb0
[ 396.136048] }
[ 396.136048] ... key at: [<ffffffff83c6f738>] __key.42521+0x0/0x8
[ 396.136048] ... acquired at:
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff8237c57c>] down_read+0x4c/0xa0
[ 396.136048] [<ffffffff814143f2>] find_free_extent+0x3a2/0xf40
[ 396.136048] [<ffffffff8141500a>] btrfs_reserve_extent+0x7a/0x140
[ 396.136048] [<ffffffff814168b1>] btrfs_alloc_free_block+0x191/0x410
[ 396.136048] [<ffffffff81400551>] __btrfs_cow_block+0x121/0x510
[ 396.136048] [<ffffffff81400b29>] btrfs_cow_block+0x149/0x2b0
[ 396.136048] [<ffffffff81404a5b>] btrfs_search_slot+0x38b/0x9a0
[ 396.136048] [<ffffffff8141e5ea>] btrfs_lookup_inode+0x2a/0xa0
[ 396.136048] [<ffffffff8147c7a0>] __btrfs_update_delayed_inode+0x60/0x220
[ 396.136048] [<ffffffff8147cfc9>] btrfs_commit_inode_delayed_inode+0xe9/0x140
[ 396.136048] [<ffffffff81434780>] btrfs_evict_inode+0x380/0x5d0
[ 396.136048] [<ffffffff81291c11>] evict+0xa1/0x170
[ 396.136048] [<ffffffff81292bb7>] iput+0x167/0x180
[ 396.136048] [<ffffffff812856ec>] do_unlinkat+0x14c/0x2c0
[ 396.136048] [<ffffffff812858c1>] SyS_unlink+0x11/0x20
[ 396.136048] [<ffffffff8237f1f9>] system_call_fastpath+0x16/0x1b
[ 396.136048]
[ 396.136048] -> (&delayed_node->mutex){+.+.-.} ops: 81340 {
[ 396.136048] HARDIRQ-ON-W at:
[ 396.136048] [<ffffffff811939de>] __lock_acquire+0x88e/0x1d90
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff82379b0a>] mutex_lock_nested+0x6a/0x4a0
[ 396.136048] [<ffffffff8147db46>] btrfs_delayed_update_inode+0x56/0x7c0
[ 396.136048] [<ffffffff8142f4b9>] btrfs_update_inode+0x89/0xf0
[ 396.136048] [<ffffffff8142f8ae>] btrfs_dirty_inode+0x5e/0xd0
[ 396.136048] [<ffffffff8142f9bb>] btrfs_update_time+0x9b/0xc0
[ 396.136048] [<ffffffff81290e30>] update_time+0x20/0xc0
[ 396.136048] [<ffffffff812931f6>] touch_atime+0x106/0x150
[ 396.136048] [<ffffffff81214697>] generic_file_aio_read+0x5b7/0x700
[ 396.136048] [<ffffffff81274435>] do_sync_read+0x55/0x80
[ 396.136048] [<ffffffff81275274>] vfs_read+0xb4/0x190
[ 396.136048] [<ffffffff81275730>] SyS_read+0x50/0xb0
[ 396.136048] [<ffffffff8237f1f9>] system_call_fastpath+0x16/0x1b
[ 396.136048] SOFTIRQ-ON-W at:
[ 396.136048] [<ffffffff81193a13>] __lock_acquire+0x8c3/0x1d90
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff82379b0a>] mutex_lock_nested+0x6a/0x4a0
[ 396.136048] [<ffffffff8147db46>] btrfs_delayed_update_inode+0x56/0x7c0
[ 396.136048] [<ffffffff8142f4b9>] btrfs_update_inode+0x89/0xf0
[ 396.136048] [<ffffffff8142f8ae>] btrfs_dirty_inode+0x5e/0xd0
[ 396.136048] [<ffffffff8142f9bb>] btrfs_update_time+0x9b/0xc0
[ 396.136048] [<ffffffff81290e30>] update_time+0x20/0xc0
[ 396.136048] [<ffffffff812931f6>] touch_atime+0x106/0x150
[ 396.136048] [<ffffffff81214697>] generic_file_aio_read+0x5b7/0x700
[ 396.136048] [<ffffffff81274435>] do_sync_read+0x55/0x80
[ 396.136048] [<ffffffff81275274>] vfs_read+0xb4/0x190
[ 396.136048] [<ffffffff81275730>] SyS_read+0x50/0xb0
[ 396.136048] [<ffffffff8237f1f9>] system_call_fastpath+0x16/0x1b
[ 396.136048] IN-RECLAIM_FS-W at:
[ 396.136048] [<ffffffff81193a63>] __lock_acquire+0x913/0x1d90
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff82379b0a>] mutex_lock_nested+0x6a/0x4a0
[ 396.136048] [<ffffffff8147b83b>] __btrfs_release_delayed_node+0x4b/0x1e0
[ 396.136048] [<ffffffff8147d03f>] btrfs_remove_delayed_node+0x1f/0x30
[ 396.136048] [<ffffffff81434968>] btrfs_evict_inode+0x568/0x5d0
[ 396.136048] [<ffffffff81291c11>] evict+0xa1/0x170
[ 396.136048] [<ffffffff81291d16>] dispose_list+0x36/0x50
[ 396.136048] [<ffffffff81291fc7>] prune_icache_sb+0x47/0x60
[ 396.136048] [<ffffffff81277b11>] super_cache_scan+0xf1/0x160
[ 396.136048] [<ffffffff812252dd>] shrink_slab_node+0x23d/0x460
[ 396.136048] [<ffffffff81226472>] shrink_slab+0x82/0x170
[ 396.136048] [<ffffffff81229c94>] balance_pgdat+0x374/0x5c0
[ 396.136048] [<ffffffff8122a3d3>] kswapd+0x4f3/0x5d0
[ 396.136048] [<ffffffff811642f0>] kthread+0xf0/0x100
[ 396.136048] [<ffffffff8237f14c>] ret_from_fork+0x7c/0xb0
[ 396.136048] INITIAL USE at:
[ 396.136048] [<ffffffff81193a97>] __lock_acquire+0x947/0x1d90
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff82379b0a>] mutex_lock_nested+0x6a/0x4a0
[ 396.136048] [<ffffffff8147db46>] btrfs_delayed_update_inode+0x56/0x7c0
[ 396.136048] [<ffffffff8142f4b9>] btrfs_update_inode+0x89/0xf0
[ 396.136048] [<ffffffff8142f8ae>] btrfs_dirty_inode+0x5e/0xd0
[ 396.136048] [<ffffffff8142f9bb>] btrfs_update_time+0x9b/0xc0
[ 396.136048] [<ffffffff81290e30>] update_time+0x20/0xc0
[ 396.136048] [<ffffffff812931f6>] touch_atime+0x106/0x150
[ 396.136048] [<ffffffff81214697>] generic_file_aio_read+0x5b7/0x700
[ 396.136048] [<ffffffff81274435>] do_sync_read+0x55/0x80
[ 396.136048] [<ffffffff81275274>] vfs_read+0xb4/0x190
[ 396.136048] [<ffffffff81275730>] SyS_read+0x50/0xb0
[ 396.136048] [<ffffffff8237f1f9>] system_call_fastpath+0x16/0x1b
[ 396.136048] }
[ 396.136048] ... key at: [<ffffffff83c73688>] __key.37841+0x0/0x8
[ 396.136048] ... acquired at:
[ 396.136048] [<ffffffff81190bf1>] check_usage_forwards+0xf1/0x110
[ 396.136048] [<ffffffff81191588>] mark_lock+0x178/0x2b0
[ 396.136048] [<ffffffff81193a63>] __lock_acquire+0x913/0x1d90
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff82379b0a>] mutex_lock_nested+0x6a/0x4a0
[ 396.136048] [<ffffffff8147b83b>] __btrfs_release_delayed_node+0x4b/0x1e0
[ 396.136048] [<ffffffff8147d03f>] btrfs_remove_delayed_node+0x1f/0x30
[ 396.136048] [<ffffffff81434968>] btrfs_evict_inode+0x568/0x5d0
[ 396.136048] [<ffffffff81291c11>] evict+0xa1/0x170
[ 396.136048] [<ffffffff81291d16>] dispose_list+0x36/0x50
[ 396.136048] [<ffffffff81291fc7>] prune_icache_sb+0x47/0x60
[ 396.136048] [<ffffffff81277b11>] super_cache_scan+0xf1/0x160
[ 396.136048] [<ffffffff812252dd>] shrink_slab_node+0x23d/0x460
[ 396.136048] [<ffffffff81226472>] shrink_slab+0x82/0x170
[ 396.136048] [<ffffffff81229c94>] balance_pgdat+0x374/0x5c0
[ 396.136048] [<ffffffff8122a3d3>] kswapd+0x4f3/0x5d0
[ 396.136048] [<ffffffff811642f0>] kthread+0xf0/0x100
[ 396.136048] [<ffffffff8237f14c>] ret_from_fork+0x7c/0xb0
[ 396.136048]
[ 396.136048]
[ 396.136048] stack backtrace:
[ 396.136048] CPU: 0 PID: 1482 Comm: kswapd0 Not tainted 3.14.0-rc3 #1
[ 396.136048] Hardware name: Hewlett-Packard HP Compaq dc7800 Small Form Factor/0AA8h, BIOS 786F1 v01.32 07/21/2011
[ 396.136048] ffffffff836ed420 ffff8800780df778 ffffffff8236448d ffff8800780df7d8
[ 396.136048] ffff8800780df7c0 ffffffff81190aa9 ffff8800780df7d8 ffff8800794bd2a0
[ 396.136048] ffff8800794bd2a0 000000000000000a ffff8800794bca40 ffffffff828ed7b5
[ 396.136048] Call Trace:
[ 396.136048] [<ffffffff8236448d>] dump_stack+0x4d/0x66
[ 396.136048] [<ffffffff81190aa9>] print_irq_inversion_bug+0x209/0x260
[ 396.136048] [<ffffffff81190bf1>] check_usage_forwards+0xf1/0x110
[ 396.136048] [<ffffffff8107f036>] ? save_stack_trace+0x26/0x50
[ 396.136048] [<ffffffff81190b00>] ? print_irq_inversion_bug+0x260/0x260
[ 396.136048] [<ffffffff81191588>] mark_lock+0x178/0x2b0
[ 396.136048] [<ffffffff81193a63>] __lock_acquire+0x913/0x1d90
[ 396.136048] [<ffffffff81078822>] ? native_sched_clock+0x82/0xc0
[ 396.136048] [<ffffffff81179f4d>] ? sched_clock_local+0x1d/0x90
[ 396.136048] [<ffffffff8117a248>] ? sched_clock_cpu+0xb8/0xe0
[ 396.136048] [<ffffffff8237dac5>] ? _raw_spin_unlock_irqrestore+0x55/0x80
[ 396.136048] [<ffffffff811969f2>] lock_acquire+0x182/0x210
[ 396.136048] [<ffffffff8147b83b>] ? __btrfs_release_delayed_node+0x4b/0x1e0
[ 396.136048] [<ffffffff82379b0a>] mutex_lock_nested+0x6a/0x4a0
[ 396.136048] [<ffffffff8147b83b>] ? __btrfs_release_delayed_node+0x4b/0x1e0
[ 396.136048] [<ffffffff8147b83b>] ? __btrfs_release_delayed_node+0x4b/0x1e0
[ 396.136048] [<ffffffff814345c9>] ? btrfs_evict_inode+0x1c9/0x5d0
[ 396.136048] [<ffffffff8117a38a>] ? local_clock+0x1a/0x40
[ 396.136048] [<ffffffff8147b83b>] __btrfs_release_delayed_node+0x4b/0x1e0
[ 396.136048] [<ffffffff8147d03f>] btrfs_remove_delayed_node+0x1f/0x30
[ 396.136048] [<ffffffff81434968>] btrfs_evict_inode+0x568/0x5d0
[ 396.136048] [<ffffffff8237da62>] ? _raw_spin_unlock+0x22/0x30
[ 396.136048] [<ffffffff81291c11>] evict+0xa1/0x170
[ 396.136048] [<ffffffff81291d16>] dispose_list+0x36/0x50
[ 396.136048] [<ffffffff81291fc7>] prune_icache_sb+0x47/0x60
[ 396.136048] [<ffffffff81277b11>] super_cache_scan+0xf1/0x160
[ 396.136048] [<ffffffff812252dd>] shrink_slab_node+0x23d/0x460
[ 396.136048] [<ffffffff8122642a>] ? shrink_slab+0x3a/0x170
[ 396.136048] [<ffffffff81226472>] shrink_slab+0x82/0x170
[ 396.136048] [<ffffffff81229c94>] balance_pgdat+0x374/0x5c0
[ 396.136048] [<ffffffff8122a3d3>] kswapd+0x4f3/0x5d0
[ 396.136048] [<ffffffff81187140>] ? __wake_up_common+0x90/0x90
[ 396.136048] [<ffffffff81229ee0>] ? balance_pgdat+0x5c0/0x5c0
[ 396.136048] [<ffffffff811642f0>] kthread+0xf0/0x100
[ 396.136048] [<ffffffff8116dcb1>] ? finish_task_switch+0x81/0x130
[ 396.136048] [<ffffffff81164200>] ? insert_kthread_work+0x90/0x90
[ 396.136048] [<ffffffff8237f14c>] ret_from_fork+0x7c/0xb0
[ 396.136048] [<ffffffff81164200>] ? insert_kthread_work+0x90/0x90
--
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