INFO: task restorecond:1982 blocked for more than 140 seconds.
      Not tainted 4.4.174+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
restorecond     D ffff8800b8077ac8 28288  1982      1 0x00000000
 ffff8800b8077ac8 ffff8801d64faf80 f3da8355e7d7ceee ffff8801d64faf80
 0000000000000001 ffff8801d64fb800 ffff8801db71f180 ffff8801db71f1a8
 ffff8801db71e898 ffff8801da6897c0 ffff8801d64faf80 ffffed001700e001
Call Trace:
 [<ffffffff82709b79>] schedule+0x99/0x1d0 kernel/sched/core.c:3355
 [<ffffffff8270a333>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388
 [<ffffffff8270c492>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8270c492>] mutex_lock_nested+0x3c2/0xb80 kernel/locking/mutex.c:621
 [<ffffffff8150d753>] vfs_setxattr+0x93/0xf0 fs/xattr.c:132
 [<ffffffff8150d974>] setxattr+0x1c4/0x390 fs/xattr.c:358
 [<ffffffff8150dc95>] path_setxattr+0x155/0x170 fs/xattr.c:379
 [<ffffffff8150e148>] SYSC_lsetxattr fs/xattr.c:401 [inline]
 [<ffffffff8150e148>] SyS_lsetxattr+0x38/0x50 fs/xattr.c:397
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
2 locks held by restorecond/1982:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff814fcd3f>] sb_start_write include/linux/fs.h:1517 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff814fcd3f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#9){+.+.+.}, at: [<ffffffff8150d753>] vfs_setxattr+0x93/0xf0 fs/xattr.c:132
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 2166 Comm: syz-executor906 Not tainted 4.4.174+ #4
task: ffff8800b4c6af80 task.stack: ffff8801d23b8000
RIP: 0010:[<ffffffff81206788>]  [<ffffffff81206788>] get_current arch/x86/include/asm/current.h:14 [inline]
RIP: 0010:[<ffffffff81206788>]  [<ffffffff81206788>] lock_release+0x528/0xcf0 kernel/locking/lockdep.c:3613
RSP: 0018:ffff8801d23bfb20  EFLAGS: 00000046
RAX: ffff8800b4c6af80 RBX: 0000000000000278 RCX: 0000000000000001
RDX: 1ffff1001698d708 RSI: 0000000000000001 RDI: ffff8800b4c6b838
RBP: ffff8801d23bfbd0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8800b4c6b848 R14: 0000000000000001 R15: ffff8800b4c6b892
FS:  0000000001f16880(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001c86308 CR3: 00000001d2887000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8800b4c6af80 ffff8801d6fc1e08 0000000000000000 0000000000000000
 0000000000000002 ffff8801d23bfbc8 0000000000000246 0000000000000000
 ffffffff81744b91 ffff8800b4c6b840 0000000100000000 ffff8800b4c6b848
Call Trace:
 [<ffffffff8271839b>] __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline]
 [<ffffffff8271839b>] _raw_read_unlock+0x1b/0x50 kernel/locking/spinlock.c:255
 [<ffffffff81744e45>] ext4_es_lookup_extent+0x365/0xc30 fs/ext4/extents_status.c:833
 [<ffffffff8164b026>] ext4_map_blocks+0x156/0x16f0 fs/ext4/inode.c:492
 [<ffffffff81634dcb>] ext4_seek_data fs/ext4/file.c:576 [inline]
 [<ffffffff81634dcb>] ext4_llseek+0x68b/0x970 fs/ext4/file.c:717
 [<ffffffff81497af3>] vfs_llseek fs/read_write.c:260 [inline]
 [<ffffffff81497af3>] SYSC_lseek fs/read_write.c:285 [inline]
 [<ffffffff81497af3>] SyS_lseek+0x113/0x180 fs/read_write.c:276
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: 00 00 8b 05 1b 13 e5 02 85 c0 75 1f 48 c7 c1 a0 ef 84 82 48 c7 c2 a0 bd 84 82 be 7b 0d 00 00 48 c7 c7 20 bd 84 82 e8 08 d1 ec ff <65> 48 8b 1c 25 80 67 01 00 48 8d bb c4 08 00 00 48 b8 00 00 00 
NMI backtrace for cpu 1
CPU: 1 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #4
task: ffff8801da6f4740 task.stack: ffff8800001d0000
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:62 [inline]
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] flat_send_IPI_mask+0xf7/0x1b0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800001d7c88  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8800001d7cb8 R08: 0000000000000018 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000003000000 R14: ffffffff82e5f2e0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001c863e0 CR3: 00000000b923a000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34
 000000000001b6c0 0000000000000008 ffff8800001d7cd8 ffffffff81092bee
 0000000000000008 ffffffff82924260 ffff8800001d7d30 ffffffff81ab8252
Call Trace:
 [<ffffffff81092bee>] nmi_raise_cpu_backtrace+0x5e/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81ab8252>] nmi_trigger_all_cpu_backtrace.cold+0xa1/0xae lib/nmi_backtrace.c:85
 [<ffffffff81092ca4>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff813b4762>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff813b4762>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813b4762>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813b4762>] watchdog.cold+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
 [<ffffffff82718fc5>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537
Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00 02 00 00 75 1e 4c 89 e7 57 9d 0f 1f 44 00 00 e8 f1