------------[ cut here ]------------
WARNING: CPU: 0 PID: 19582 at fs/btrfs/volumes.c:1166 close_fs_devices+0x692/0x6f0 fs/btrfs/volumes.c:1166
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 19582 Comm: syz-executor.1 Not tainted 5.9.0-rc6-syzkaller #0
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+0x1d6/0x29e lib/dump_stack.c:118
 panic+0x2c0/0x800 kernel/panic.c:231
 __warn+0x227/0x250 kernel/panic.c:600
 report_bug+0x1b1/0x2e0 lib/bug.c:198
 handle_bug+0x42/0x80 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:close_fs_devices+0x692/0x6f0 fs/btrfs/volumes.c:1166
Code: 8a 04 28 84 c0 75 68 c6 03 00 48 83 c4 40 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 0a 6a 4e fe 0f 0b e9 7c ff ff ff e8 fe 69 4e fe <0f> 0b eb a8 89 d1 80 e1 07 80 c1 03 38 c1 0f 8c 9d f9 ff ff 48 89
RSP: 0018:ffffc90009427760 EFLAGS: 00010246
RAX: ffffffff8326a332 RBX: ffffffffffffffff RCX: 0000000000040000
RDX: ffffc9000a609000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffff888096b4e108 R08: ffffffff8326a2d4 R09: ffffed1012d69c10
R10: ffffed1012d69c10 R11: 0000000000000000 R12: 1ffff1101109110a
R13: dffffc0000000000 R14: 1ffff1101109110c R15: ffff888088488860
 btrfs_close_devices+0x2f/0x130 fs/btrfs/volumes.c:1179
 open_ctree+0x205b/0x423c fs/btrfs/disk-io.c:3434
 btrfs_fill_super fs/btrfs/super.c:1316 [inline]
 btrfs_mount_root+0x9d6/0xb60 fs/btrfs/super.c:1672
 legacy_get_tree+0xea/0x180 fs/fs_context.c:592
 vfs_get_tree+0x88/0x270 fs/super.c:1547
 fc_mount fs/namespace.c:978 [inline]
 vfs_kern_mount+0xc9/0x160 fs/namespace.c:1008
 btrfs_mount+0x33c/0xae0 fs/btrfs/super.c:1732
 legacy_get_tree+0xea/0x180 fs/fs_context.c:592
 vfs_get_tree+0x88/0x270 fs/super.c:1547
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x179d/0x29e0 fs/namespace.c:3192
 do_mount fs/namespace.c:3205 [inline]
 __do_sys_mount fs/namespace.c:3413 [inline]
 __se_sys_mount+0x126/0x180 fs/namespace.c:3390
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x46004a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd 89 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 da 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f2561803a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2561803b20 RCX: 000000000046004a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f2561803ae0
RBP: 00007f2561803ae0 R08: 00007f2561803b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020000040
Kernel Offset: disabled
Rebooting in 86400 seconds..