------------[ cut here ]------------
WARNING: CPU: 1 PID: 23980 at fs/btrfs/volumes.c:1168 close_fs_devices+0x772/0x9a0 fs/btrfs/volumes.c:1168
Modules linked in:
CPU: 1 PID: 23980 Comm: syz-executor.0 Not tainted 5.13.0-rc5-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 23 2f 34 fe 85 db 0f 85 07 f9 ff ff e8 66 27 34 fe 0f 0b e9 fb f8 ff ff e8 5a 27 34 fe 0f 0b e9 e2 fd ff ff e8 4e 27 34 fe <0f> 0b e9 19 fe ff ff 48 c7 c7 2c 9c c9 8d e8 2b 31 79 fe e9 bb f8
RSP: 0018:ffffc90016de7748 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc90001881000
RDX: 0000000000040000 RSI: ffffffff8340b532 RDI: 0000000000000003
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffff888032a8c13b
R10: ffffffff8340b349 R11: 0000000000000000 R12: ffff888032a8c138
R13: 0000000000000000 R14: ffff8880361c0108 R15: ffff888032a8c050
FS:  00007f4554fbb700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4604c28000 CR3: 000000002a929000 CR4: 0000000000350ee0
Call Trace:
 btrfs_close_devices+0x8e/0x4b0 fs/btrfs/volumes.c:1180
 open_ctree+0x407a/0x411f fs/btrfs/disk-io.c:3693
 btrfs_fill_super fs/btrfs/super.c:1382 [inline]
 btrfs_mount_root.cold+0x14/0x165 fs/btrfs/super.c:1749
 legacy_get_tree+0x105/0x220 fs/fs_context.c:592
 vfs_get_tree+0x89/0x2f0 fs/super.c:1498
 fc_mount fs/namespace.c:993 [inline]
 vfs_kern_mount.part.0+0xd3/0x170 fs/namespace.c:1023
 vfs_kern_mount+0x3c/0x60 fs/namespace.c:1010
 btrfs_mount+0x234/0xa20 fs/btrfs/super.c:1809
 legacy_get_tree+0x105/0x220 fs/fs_context.c:592
 vfs_get_tree+0x89/0x2f0 fs/super.c:1498
 do_new_mount fs/namespace.c:2905 [inline]
 path_mount+0x132a/0x1fa0 fs/namespace.c:3235
 do_mount fs/namespace.c:3248 [inline]
 __do_sys_mount fs/namespace.c:3456 [inline]
 __se_sys_mount fs/namespace.c:3433 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x467afa
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 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:00007f4554fbafa8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000467afa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f4554fbb000
RBP: 00007f4554fbb040 R08: 00007f4554fbb040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f4554fbb000 R15: 000000002001ee00