Trivially reproducible every boot, shortly after mount happens. Also
happened with rc2.
[ 13.225891] virbr0: port 1(virbr0-nic) entered blocking state
[ 13.225895] virbr0: port 1(virbr0-nic) entered listening state
[ 13.299806] virbr0: port 1(virbr0-nic) entered disabled state
[ 13.309179] =============================================
[ 13.309181] [ INFO: possible recursive locking detected ]
[ 13.309182] 4.8.0-0.rc3.git0.1.fc25.x86_64+debug #1 Not tainted
[ 13.309183] ---------------------------------------------
[ 13.309185] libvirt_leasesh/1174 is trying to acquire lock:
[ 13.309186] (&ei->log_mutex){+.+...}, at: [<ffffffffc0737e12>]
btrfs_log_inode+0x162/0x10f0 [btrfs]
[ 13.309212]
but task is already holding lock:
[ 13.309213] (&ei->log_mutex){+.+...}, at: [<ffffffffc0737e12>]
btrfs_log_inode+0x162/0x10f0 [btrfs]
[ 13.309229]
other info that might help us debug this:
[ 13.309230] Possible unsafe locking scenario:
[ 13.309231] CPU0
[ 13.309232] ----
[ 13.309233] lock(&ei->log_mutex);
[ 13.309235] lock(&ei->log_mutex);
[ 13.309237]
*** DEADLOCK ***
[ 13.309238] May be due to missing lock nesting notation
[ 13.309240] 6 locks held by libvirt_leasesh/1174:
[ 13.309241] #0: (sb_writers#8){.+.+.+}, at: [<ffffffff9f2a5944>]
__sb_start_write+0xb4/0xf0
[ 13.309247] #1: (&type->i_mutex_dir_key#3/1){+.+.+.}, at:
[<ffffffff9f2ae2ba>] lock_rename+0xda/0x100
[ 13.309252] #2: (&sb->s_type->i_mutex_key#14){+.+.+.}, at:
[<ffffffff9f2c2a2e>] lock_two_nondirectories+0x3e/0x70
[ 13.309258] #3: (&sb->s_type->i_mutex_key#14/4){+.+...}, at:
[<ffffffff9f2c2a56>] lock_two_nondirectories+0x66/0x70
[ 13.309263] #4: (sb_internal){.+.+.+}, at: [<ffffffff9f2a5908>]
__sb_start_write+0x78/0xf0
[ 13.309266] #5: (&ei->log_mutex){+.+...}, at:
[<ffffffffc0737e12>] btrfs_log_inode+0x162/0x10f0 [btrfs]
[ 13.309282]
stack backtrace:
[ 13.309284] CPU: 2 PID: 1174 Comm: libvirt_leasesh Not tainted
4.8.0-0.rc3.git0.1.fc25.x86_64+debug #1
[ 13.309285] Hardware name: Apple Inc.
MacBookPro8,2/Mac-94245A3940C91C80, BIOS
MBP81.88Z.0047.B2C.1510261540 10/26/15
[ 13.309287] 0000000000000086 0000000003b4acd5 ffff891b0a1d77a0
ffffffff9f466723
[ 13.309290] ffffffffa0b07910 ffff891adcf44000 ffff891b0a1d7868
ffffffff9f10f01e
[ 13.309294] 00000000dcf44a78 ffffffff00000006 00000000b967c054
ffffffffa0408900
[ 13.309297] Call Trace:
[ 13.309301] [<ffffffff9f466723>] dump_stack+0x86/0xc3
[ 13.309303] [<ffffffff9f10f01e>] __lock_acquire+0x78e/0x1290
[ 13.309306] [<ffffffff9f037f29>] ? sched_clock+0x9/0x10
[ 13.309309] [<ffffffff9f0ea5c7>] ? sched_clock_cpu+0xa7/0xc0
[ 13.309312] [<ffffffff9f8f561e>] ? mutex_unlock+0xe/0x10
[ 13.309314] [<ffffffff9f10ff86>] lock_acquire+0xf6/0x1f0
[ 13.309326] [<ffffffffc0737e12>] ? btrfs_log_inode+0x162/0x10f0 [btrfs]
[ 13.309328] [<ffffffff9f8f49a6>] mutex_lock_nested+0x86/0x3f0
[ 13.309340] [<ffffffffc0737e12>] ? btrfs_log_inode+0x162/0x10f0 [btrfs]
[ 13.309341] [<ffffffff9f8f561e>] ? mutex_unlock+0xe/0x10
[ 13.309353] [<ffffffffc0737e12>] ? btrfs_log_inode+0x162/0x10f0 [btrfs]
[ 13.309365] [<ffffffffc0737e12>] btrfs_log_inode+0x162/0x10f0 [btrfs]
[ 13.309368] [<ffffffff9f0deaa9>] ? __might_sleep+0x49/0x80
[ 13.309380] [<ffffffffc073893c>] btrfs_log_inode+0xc8c/0x10f0 [btrfs]
[ 13.309382] [<ffffffff9f037f29>] ? sched_clock+0x9/0x10
[ 13.309394] [<ffffffffc0739070>] btrfs_log_inode_parent+0x240/0x940 [btrfs]
[ 13.309396] [<ffffffff9f8f82e7>] ? _raw_spin_unlock+0x27/0x40
[ 13.309408] [<ffffffffc06f3dba>] ? btrfs_update_inode+0xda/0x110 [btrfs]
[ 13.309420] [<ffffffffc073acf1>] btrfs_log_new_name+0x71/0x90 [btrfs]
[ 13.309432] [<ffffffffc06fdcd0>] btrfs_rename2+0x1090/0x17a0 [btrfs]
[ 13.309434] [<ffffffff9f12dc1d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 13.309437] [<ffffffff9f2c2a56>] ? lock_two_nondirectories+0x66/0x70
[ 13.309439] [<ffffffff9f2afef2>] vfs_rename+0x5c2/0x970
[ 13.309441] [<ffffffff9f2ae100>] ? legitimize_path.isra.34+0x20/0x60
[ 13.309443] [<ffffffff9f2b6a77>] SyS_rename+0x3a7/0x3d0
[ 13.309445] [<ffffffff9f8f8c3c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[ 13.318819] device virbr0-nic left promiscuous mode
[ 13.318854] virbr0: port 1(virbr0-nic) entered disabled state
--
Chris Murphy
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