------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(depth <= 0)
WARNING: CPU: 1 PID: 29302 at kernel/locking/lockdep.c:3595 __lock_release kernel/locking/lockdep.c:3595 [inline]
WARNING: CPU: 1 PID: 29302 at kernel/locking/lockdep.c:3595 lock_release+0x740/0xa10 kernel/locking/lockdep.c:3863
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 29302 Comm: syz-executor3 Not tainted 4.20.0-rc1-next-20181109+ #110
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:__lock_release kernel/locking/lockdep.c:3595 [inline]
RIP: 0010:lock_release+0x740/0xa10 kernel/locking/lockdep.c:3863
Code: 03 38 d0 7c 08 84 d2 0f 85 da 02 00 00 8b 35 a7 95 b3 08 85 f6 75 15 48 c7 c6 20 66 2b 88 48 c7 c7 c0 33 2b 88 e8 10 36 e7 ff <0f> 0b 48 8b 95 e8 fe ff ff 4c 89 f7 48 8b b5 f0 fe ff ff e8 e8 58
RSP: 0018:ffff8801b3747868 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 1ffff100366e8f12 RCX: ffffc90005b16000
RDX: 0000000000005f2c RSI: ffffffff8165ba15 RDI: 0000000000000006
RBP: ffff8801b3747998 R08: ffff8801caf0c400 R09: fffffbfff12b2254
R10: fffffbfff12b2254 R11: ffffffff895912a3 R12: ffffffff8b0e27a0
R13: ffff8801b3747970 R14: ffff8801caf0c400 R15: ffff8801b37478b0
 __mutex_unlock_slowpath+0x102/0x8c0 kernel/locking/mutex.c:1197
 mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713
 loop_control_ioctl+0xf5/0x4e0 drivers/block/loop.c:2095
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f52c69c5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000007
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f52c69c66d4
R13: 00000000004c06f1 R14: 00000000004d1028 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..