RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fe8cb1f7fe0
RBP: 00007fe8cb1f8020 R08: 00007fe8cb1f8020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007fe8cb1f7fe0 R15: 0000000020000040
------------[ cut here ]------------
kernel BUG at fs/btrfs/volumes.c:891!
befs: (loop5): No write support. Marking filesystem read-only
befs: (loop5): invalid magic header
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 17222 Comm: syz-executor.0 Not tainted 4.14.277-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880934ce600 task.stack: ffff8880567e0000
RIP: 0010:btrfs_prepare_close_one_device fs/btrfs/volumes.c:891 [inline]
RIP: 0010:__btrfs_close_devices+0x86d/0xb20 fs/btrfs/volumes.c:916
RSP: 0018:ffff8880567e7820 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff8880a8eedb00 RCX: ffffc90005cc2000
RDX: 0000000000040000 RSI: ffffffff82a72aed RDI: 0000000000000286
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809302e7c0
R13: ffff8880a8eedbc8 R14: fffffffffffffff4 R15: ffff8880b610f680
FS:  00007fe8cb1f8700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fac30972018 CR3: 000000009936c000 CR4: 00000000003426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 btrfs_close_devices+0x24/0x140 fs/btrfs/volumes.c:949
 btrfs_mount+0x1686/0x1fe0 fs/btrfs/super.c:1648
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount+0x3c/0x60 fs/namespace.c:1036
 mount_subvol fs/btrfs/super.c:1398 [inline]
 btrfs_mount+0x42a/0x1fe0 fs/btrfs/super.c:1569
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2572 [inline]
 do_mount+0xe65/0x2a10 fs/namespace.c:2902
 SYSC_mount fs/namespace.c:3118 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3095
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7fe8cc88461a
RSP: 002b:00007fe8cb1f7f88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fe8cc88461a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fe8cb1f7fe0
RBP: 00007fe8cb1f8020 R08: 00007fe8cb1f8020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007fe8cb1f7fe0 R15: 0000000020000040
Code: ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e f0 01 00 00 48 8b 44 24 08 c7 80 10 01 00 00 00 00 00 00 e9 4f f8 ff ff e8 b3 1b ae fe <0f> 0b e8 ac 1b ae fe 0f 0b 48 89 cf e8 52 d3 d7 fe e9 19 f8 ff 
RIP: btrfs_prepare_close_one_device fs/btrfs/volumes.c:891 [inline] RSP: ffff8880567e7820
RIP: __btrfs_close_devices+0x86d/0xb20 fs/btrfs/volumes.c:916 RSP: ffff8880567e7820
---[ end trace 804c35aa8178bf31 ]---