------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(sem->owner != get_current())
WARNING: CPU: 0 PID: 14881 at kernel/locking/rwsem.c:133 up_write+0x1c6/0x210 kernel/locking/rwsem.c:133
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 14881 Comm: syz-executor5 Not tainted 4.16.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b9/0x29f lib/dump_stack.c:53
 panic+0x22f/0x4de kernel/panic.c:183
 __warn.cold.8+0x163/0x1a3 kernel/panic.c:547
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1bc/0x470 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:991
RIP: 0010:up_write+0x1c6/0x210 kernel/locking/rwsem.c:133
RSP: 0018:ffff8801c1147798 EFLAGS: 00010286
RAX: 0000000000000030 RBX: ffff8801cd7c4e00 RCX: ffffc900078bd000
RDX: 000000000001952d RSI: ffffffff815f6911 RDI: 0000000000000001
RBP: ffff8801c1147820 R08: ffff8801c4bde6c0 R09: fffffbfff1170f00
R10: fffffbfff1170f00 R11: ffffffff88b87803 R12: 1ffff10038228ef3
R13: dffffc0000000000 R14: ffff8801c11477f8 R15: ffff8801cd7c4e58
 percpu_up_write+0xcd/0x110 kernel/locking/percpu-rwsem.c:183
 sb_freeze_unlock fs/super.c:1390 [inline]
 thaw_super+0x205/0x270 fs/super.c:1524
 thaw_bdev+0x162/0x1a0 fs/block_dev.c:555
 ext4_shutdown fs/ext4/ioctl.c:489 [inline]
 ext4_ioctl+0x17b0/0x3ee0 fs/ext4/ioctl.c:1048
 ext4_compat_ioctl+0xdb/0x4f0 fs/ext4/ioctl.c:1115
 C_SYSC_ioctl fs/compat_ioctl.c:1461 [inline]
 compat_SyS_ioctl+0xa37/0x33b0 fs/compat_ioctl.c:1407
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x455319
RSP: 002b:00007fb96217ac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000202
RAX: ffffffffffffffda RBX: 00007fb96217b6d4 RCX: 0000000000455319
RDX: 0000000000705000 RSI: 000000008004587d RDI: 0000000000000016
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000240 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000641 R14: 00000000006fc6b8 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..