WARNING: CPU: 0 PID: 8437 at fs/btrfs/volumes.c:1168 close_fs_devices+0x763/0x880 fs/btrfs/volumes.c:1168
Modules linked in:
CPU: 0 PID: 8437 Comm: syz-executor.3 Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:close_fs_devices+0x763/0x880 fs/btrfs/volumes.c:1168
Code: c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 c5 b7 18 fe 0f 0b e9 29 f9 ff ff e8 b9 b7 18 fe 0f 0b e9 3c ff ff ff e8 ad b7 18 fe <0f> 0b e9 69 ff ff ff 48 c7 c1 94 5c 38 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000170fb70 EFLAGS: 00010293
RAX: ffffffff83666163 RBX: 0000000000000001 RCX: ffff888020cc54c0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88801c75b508 R08: ffffffff836660c5 R09: ffffed1003c70e28
R10: ffffed1003c70e28 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88801e387068 R14: 1ffff11003c70e0d R15: 1ffff11003c70e0a
FS:  000000000210a400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3e0add6fe8 CR3: 0000000079add000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 btrfs_close_devices+0xc9/0x450 fs/btrfs/volumes.c:1180
 close_ctree+0x693/0x7fd fs/btrfs/disk-io.c:4449
 generic_shutdown_super+0x12e/0x2b0 fs/super.c:465
 kill_anon_super+0x36/0x60 fs/super.c:1057
 btrfs_kill_super+0x3d/0x50 fs/btrfs/super.c:2379
 deactivate_locked_super+0xa7/0xf0 fs/super.c:335
 cleanup_mnt+0x462/0x510 fs/namespace.c:1136
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x201/0x220 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:302
 do_syscall_64+0x4b/0xb0 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x467a37
Code: ff d0 48 89 c7 b8 3c 00 00 00 0f 05 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeabe15088 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000467a37
RDX: 00007ffeabe1515b RSI: 0000000000000002 RDI: 00007ffeabe15150
RBP: 00007ffeabe15150 R08: 00000000ffffffff R09: 00007ffeabe14f20
R10: 000000000210b8e3 R11: 0000000000000246 R12: 00000000004bee70
R13: 00007ffeabe16220 R14: 000000000210b810 R15: 00007ffeabe16260