------------[ cut here ]------------ WARNING: CPU: 1 PID: 8663 at fs/btrfs/volumes.c:1168 close_fs_devices+0x772/0x9a0 fs/btrfs/volumes.c:1168 Modules linked in: CPU: 0 PID: 8663 Comm: syz-executor.5 Not tainted 5.13.0-rc2-next-20210518-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:close_fs_devices+0x772/0x9a0 fs/btrfs/volumes.c:1168 Code: e8 53 af 32 fe 85 db 0f 85 07 f9 ff ff e8 06 a8 32 fe 0f 0b e9 fb f8 ff ff e8 fa a7 32 fe 0f 0b e9 e2 fd ff ff e8 ee a7 32 fe <0f> 0b e9 19 fe ff ff 48 c7 c7 6c f7 e9 8d e8 fb 09 78 fe e9 bb f8 RSP: 0018:ffffc900018cfbd0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff888018cfd580 RSI: ffffffff83432be2 RDI: 0000000000000003 RBP: dffffc0000000000 R08: 0000000000000000 R09: ffff888029c1c93b R10: ffffffff834329f9 R11: 0000000000000000 R12: ffff888029c1c938 R13: 0000000000000000 R14: ffff88802a330d08 R15: ffff888029c1c850 FS: 0000000002c24400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005580c4875d38 CR3: 000000007c3d5000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: btrfs_close_devices+0x8e/0x4b0 fs/btrfs/volumes.c:1180 close_ctree+0x752/0x795 fs/btrfs/disk-io.c:4438 generic_shutdown_super+0x14c/0x370 fs/super.c:465 kill_anon_super+0x36/0x60 fs/super.c:1057 btrfs_kill_super+0x38/0x50 fs/btrfs/super.c:2379 deactivate_locked_super+0x94/0x160 fs/super.c:335 deactivate_super+0xad/0xd0 fs/super.c:366 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1136 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x26f/0x280 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 do_syscall_64+0x3e/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:00007ffd2f8e1098 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000467a37 RDX: 00007ffd2f8e116b RSI: 0000000000000002 RDI: 00007ffd2f8e1160 RBP: 00007ffd2f8e1160 R08: 00000000ffffffff R09: 00007ffd2f8e0f30 R10: 0000000002c258e3 R11: 0000000000000246 R12: 00000000004bee70 R13: 00007ffd2f8e2230 R14: 0000000002c25810 R15: 00007ffd2f8e2270