Still happens in rc6.
[ 588.463987] =============================================
[ 588.463988] [ INFO: possible recursive locking detected ]
[ 588.463998] 4.8.0-0.rc6.git0.1.fc25.x86_64+debug #1 Tainted: G W
[ 588.463998] ---------------------------------------------
[ 588.464000] URL Classifier/2203 is trying to acquire lock:
[ 588.464001] (&ei->log_mutex){+.+...}, at: [<ffffffffc08ba032>]
btrfs_log_inode+0x162/0x1190 [btrfs]
[ 588.464024]
but task is already holding lock:
[ 588.464025] (&ei->log_mutex){+.+...}, at: [<ffffffffc08ba032>]
btrfs_log_inode+0x162/0x1190 [btrfs]
[ 588.464040]
other info that might help us debug this:
[ 588.464041] Possible unsafe locking scenario:
[ 588.464042] CPU0
[ 588.464042] ----
[ 588.464043] lock(&ei->log_mutex);
[ 588.464045] lock(&ei->log_mutex);
[ 588.464046]
*** DEADLOCK ***
[ 588.464048] May be due to missing lock nesting notation
[ 588.464049] 3 locks held by URL Classifier/2203:
[ 588.464050] #0: (&sb->s_type->i_mutex_key#14){+.+.+.}, at:
[<ffffffffc0888a73>] btrfs_sync_file+0x163/0x4c0 [btrfs]
[ 588.464064] #1: (sb_internal){.+.+.+}, at: [<ffffffff892a4e24>]
__sb_start_write+0xb4/0xf0
[ 588.464069] #2: (&ei->log_mutex){+.+...}, at:
[<ffffffffc08ba032>] btrfs_log_inode+0x162/0x1190 [btrfs]
[ 588.464082]
stack backtrace:
[ 588.464085] CPU: 2 PID: 2203 Comm: URL Classifier Tainted: G
W 4.8.0-0.rc6.git0.1.fc25.x86_64+debug #1
[ 588.464086] Hardware name: Apple Inc.
MacBookPro8,2/Mac-94245A3940C91C80, BIOS
MBP81.88Z.0047.B2C.1510261540 10/26/15
[ 588.464087] 0000000000000086 00000000b11b9806 ffff8bbba123f840
ffffffff89465753
[ 588.464090] ffffffff8ab07530 ffff8bbba1238000 ffff8bbba123f908
ffffffff8910eeae
[ 588.464093] 0000000000000282 ffffffff00000003 00000000a123f870
ffffffff8a428200
[ 588.464095] Call Trace:
[ 588.464099] [<ffffffff89465753>] dump_stack+0x86/0xc3
[ 588.464102] [<ffffffff8910eeae>] __lock_acquire+0x78e/0x1290
[ 588.464105] [<ffffffff89487754>] ? debug_check_no_obj_freed+0x154/0x260
[ 588.464107] [<ffffffff8910e1e6>] ? mark_held_locks+0x76/0xa0
[ 588.464116] [<ffffffffc083e986>] ? btrfs_free_path+0x26/0x30 [btrfs]
[ 588.464118] [<ffffffff8910fe16>] lock_acquire+0xf6/0x1f0
[ 588.464129] [<ffffffffc08ba032>] ? btrfs_log_inode+0x162/0x1190 [btrfs]
[ 588.464132] [<ffffffff898f1516>] mutex_lock_nested+0x86/0x3f0
[ 588.464143] [<ffffffffc08ba032>] ? btrfs_log_inode+0x162/0x1190 [btrfs]
[ 588.464153] [<ffffffffc08ba032>] ? btrfs_log_inode+0x162/0x1190 [btrfs]
[ 588.464155] [<ffffffff8926f2ca>] ? kmem_cache_alloc+0x27a/0x2d0
[ 588.464163] [<ffffffffc083e79a>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 588.464174] [<ffffffffc08ba032>] btrfs_log_inode+0x162/0x1190 [btrfs]
[ 588.464176] [<ffffffff890dea59>] ? __might_sleep+0x49/0x80
[ 588.464187] [<ffffffffc08babeb>] btrfs_log_inode+0xd1b/0x1190 [btrfs]
[ 588.464189] [<ffffffff89037e79>] ? sched_clock+0x9/0x10
[ 588.464199] [<ffffffffc08bb4ff>] btrfs_log_inode_parent+0x40f/0x940 [btrfs]
[ 588.464202] [<ffffffff892be589>] ? dget_parent+0x99/0x2a0
[ 588.464212] [<ffffffffc08bca12>] btrfs_log_dentry_safe+0x62/0x80 [btrfs]
[ 588.464223] [<ffffffffc0888c21>] btrfs_sync_file+0x311/0x4c0 [btrfs]
[ 588.464226] [<ffffffff892df57b>] vfs_fsync_range+0x4b/0xb0
[ 588.464228] [<ffffffff892df63d>] do_fsync+0x3d/0x70
[ 588.464229] [<ffffffff892df900>] SyS_fsync+0x10/0x20
[ 588.464231] [<ffffffff898f57bc>] entry_SYSCALL_64_fastpath+0x1f/0xbd
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