BTRFS warning (device <unknown>): duplicate device fsid:devid for f90cac8b-044b-4fa8-8bee-4b8d3da88dc2:1 old:/dev/loop5 new:/dev/loop0
BTRFS warning (device loop5): duplicate device fsid:devid for f90cac8b-044b-4fa8-8bee-4b8d3da88dc2:1 old:/dev/loop5 new:/dev/loop0
BTRFS info (device loop5): checking UUID tree
WARNING: CPU: 1 PID: 8233 at fs/fs-writeback.c:2363 __writeback_inodes_sb_nr+0x223/0x270 fs/fs-writeback.c:2367
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8233 Comm: kworker/u4:8 Not tainted 5.0.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x165/0x21a lib/dump_stack.c:113
 panic+0x212/0x40b kernel/panic.c:214
 __warn.cold.7+0x1b/0x38 kernel/panic.c:571
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:__writeback_inodes_sb_nr+0x223/0x270 fs/fs-writeback.c:2363
Code: 00 00 c7 40 14 00 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 75 33 48 81 c4 f0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b e9 76 ff ff ff 48 89 c7 e8 8e 35 ed ff e9 07 ff ff ff 4c 89
RSP: 0018:ffff88808f717928 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff11011ee2f27 RCX: 1ffff110104289a6
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff888082144d30
RBP: ffff88808f717a40 R08: ffffed10104289a7 R09: ffffed10104289a6
R10: ffffed10104289a6 R11: ffff888082144d37 R12: ffff88808f5a6900
R13: ffff888082144df0 R14: ffff88808f717958 R15: ffff888082144cc0
 writeback_inodes_sb_nr fs/fs-writeback.c:2383 [inline]
 writeback_inodes_sb+0x22/0x30 fs/fs-writeback.c:2398
 btrfs_start_delalloc_flush fs/btrfs/transaction.c:1901 [inline]
 btrfs_commit_transaction+0x1780/0x2480 fs/btrfs/transaction.c:2027
 may_commit_transaction fs/btrfs/extent-tree.c:4889 [inline]
 flush_space+0x327/0xda0 fs/btrfs/extent-tree.c:4964
 btrfs_async_reclaim_metadata_space+0x422/0x1060 fs/btrfs/extent-tree.c:5075
 process_one_work+0x7b9/0x15e0 kernel/workqueue.c:2173
 worker_thread+0x85/0xb60 kernel/workqueue.c:2319
 kthread+0x324/0x3e0 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..