WARNING: CPU: 0 PID: 25238 at fs/btrfs/volumes.c:1071 close_fs_devices+0xbc7/0xfa0 fs/btrfs/volumes.c:1071
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 25238 Comm: syz-executor2 Not tainted 4.17.0+ #84
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+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:close_fs_devices+0xbc7/0xfa0 fs/btrfs/volumes.c:1071
Code: a0 b4 fe 0f 0b e8 89 a0 b4 fe 0f 0b 48 89 f7 e8 8f 10 f1 fe e9 f6 f5 ff ff e8 75 a0 b4 fe 0f 0b e9 fd fd ff ff e8 69 a0 b4 fe <0f> 0b e9 a8 fd ff ff 48 8b bd 58 fd ff ff e8 26 11 f1 fe e9 35 fd 
RSP: 0018:ffff8801af9e7050 EFLAGS: 00010216
RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc900052e2000
RDX: 0000000000004301 RSI: ffffffff82c4b097 RDI: 0000000000000007
RBP: ffff8801af9e7350 R08: ffff8801a920c380 R09: 0000000000000006
R10: ffff8801a920c380 R11: 0000000000000000 R12: ffffed0035f3ce25
R13: 1ffff10035f3ce5d R14: ffff8801af9e72e8 R15: ffff8801c7f74948
 btrfs_close_devices+0x29/0x150 fs/btrfs/volumes.c:1085
 btrfs_mount_root+0x1419/0x1e70 fs/btrfs/super.c:1610
 mount_fs+0xae/0x328 fs/super.c:1277
 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037
 vfs_kern_mount+0x40/0x60 fs/namespace.c:1027
 btrfs_mount+0x4a1/0x213e fs/btrfs/super.c:1661
 mount_fs+0xae/0x328 fs/super.c:1277
 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037
 vfs_kern_mount fs/namespace.c:1027 [inline]
 do_new_mount fs/namespace.c:2518 [inline]
 do_mount+0x564/0x30b0 fs/namespace.c:2848
 ksys_mount+0x12d/0x140 fs/namespace.c:3064
 __do_sys_mount fs/namespace.c:3078 [inline]
 __se_sys_mount fs/namespace.c:3075 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45843a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ba 8f fb ff c3 66 0f 1f 84 00 00 00 00 00 
RSP: 002b:00007efe324f9ba8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 000000000045843a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007efe324f9bf0
RBP: 0000000000000001 R08: 00000000200006c0 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000013
R13: 0000000000000001 R14: 0000000000700008 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..