------------[ cut here ]------------
kernel BUG at fs/btrfs/volumes.c:1276!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 13726 Comm: syz-executor.3 Not tainted 5.1.0-rc2+ #38
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:btrfs_close_one_device fs/btrfs/volumes.c:1276 [inline]
RIP: 0010:close_fs_devices.part.0+0x5bf/0x790 fs/btrfs/volumes.c:1300
Code: 3c 03 0f 8e 44 01 00 00 48 8b 45 c0 c7 80 30 01 00 00 00 00 00 00 48 83 c4 48 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a1 e7 c6 fe <0f> 0b e8 9a e7 c6 fe 0f 0b e8 93 e7 c6 fe 0f 0b e9 16 ff ff ff e8
RSP: 0018:ffff8880599af770 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88809a5e1000 RCX: ffffc90014041000
RDX: 0000000000040000 RSI: ffffffff82a989df RDI: 0000000000000007
RBP: ffff8880599af7e0 R08: ffff888094c38100 R09: ffff888094c389c8
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880a7d66000 R15: fffffffffffffff4
FS:  00007f27911d0700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffda95bdfb8 CR3: 000000004f30b000 CR4: 00000000001406f0
DR0: 000000000000b8c4 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 close_fs_devices fs/btrfs/volumes.c:1332 [inline]
 btrfs_close_devices+0xa0/0x200 fs/btrfs/volumes.c:1318
 btrfs_mount_root+0xf0c/0x1220 fs/btrfs/super.c:1569
 legacy_get_tree+0xf2/0x200 fs/fs_context.c:584
 vfs_get_tree+0x123/0x450 fs/super.c:1481
 fc_mount+0x17/0xc0 fs/namespace.c:982
 vfs_kern_mount.part.0+0xd8/0xf0 fs/namespace.c:1012
 vfs_kern_mount+0x40/0x60 fs/namespace.c:999
 btrfs_mount+0x2b4/0x15e2 fs/btrfs/super.c:1620
 legacy_get_tree+0xf2/0x200 fs/fs_context.c:584
 vfs_get_tree+0x123/0x450 fs/super.c:1481
 do_new_mount fs/namespace.c:2622 [inline]
 do_mount+0x1436/0x2c40 fs/namespace.c:2942
 ksys_mount+0xdb/0x150 fs/namespace.c:3151
 __do_sys_mount fs/namespace.c:3165 [inline]
 __se_sys_mount fs/namespace.c:3162 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3162
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45ac7a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 2d 8e 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 0a 8e fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f27911cfa88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f27911cfb40 RCX: 000000000045ac7a
RDX: 00007f27911cfae0 RSI: 0000000020000100 RDI: 00007f27911cfb00
RBP: 0000000000000001 R08: 00007f27911cfb40 R09: 00007f27911cfae0
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000005
R13: 00000000004c69e5 R14: 00000000004dbfc8 R15: 0000000000000004
Modules linked in:
---[ end trace 0c380aed859e158a ]---
RIP: 0010:btrfs_close_one_device fs/btrfs/volumes.c:1276 [inline]
RIP: 0010:close_fs_devices.part.0+0x5bf/0x790 fs/btrfs/volumes.c:1300
Code: 3c 03 0f 8e 44 01 00 00 48 8b 45 c0 c7 80 30 01 00 00 00 00 00 00 48 83 c4 48 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a1 e7 c6 fe <0f> 0b e8 9a e7 c6 fe 0f 0b e8 93 e7 c6 fe 0f 0b e9 16 ff ff ff e8
RSP: 0018:ffff8880599af770 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88809a5e1000 RCX: ffffc90014041000
RDX: 0000000000040000 RSI: ffffffff82a989df RDI: 0000000000000007
RBP: ffff8880599af7e0 R08: ffff888094c38100 R09: ffff888094c389c8
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880a7d66000 R15: fffffffffffffff4
FS:  00007f27911d0700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000070b158 CR3: 000000004f30b000 CR4: 00000000001406f0
DR0: 000000000000b8c4 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400