FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
------------[ cut here ]------------
FAT-fs (loop5): error, corrupted directory (invalid entries)
WARNING: CPU: 0 PID: 26307 at fs/fs-writeback.c:2394 __writeback_inodes_sb_nr.cold+0x11/0x18 fs/fs-writeback.c:2394
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 26307 Comm: btrfs-transacti Not tainted 4.19.167-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+0x1fc/0x2fe lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x61 kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:__writeback_inodes_sb_nr.cold+0x11/0x18 fs/fs-writeback.c:2394
Code: bb e8 1a 79 b3 ff 48 c7 c7 20 f3 74 88 e8 fd 72 9e ff 0f 0b e9 be 46 ff ff e8 02 79 b3 ff 48 c7 c7 20 f3 74 88 e8 e5 72 9e ff <0f> 0b e9 7d 6a ff ff e8 ea 78 b3 ff 48 c7 c7 20 f3 74 88 e8 cd 72
RSP: 0018:ffff8880b31efc48 EFLAGS: 00010286
RAX: 0000000000000024 RBX: 1ffff1101663df8b RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814fde01 RDI: ffffed101663df7b
RBP: ffff88809cf72c40 R08: 0000000000000024 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000006400
R13: ffff8880a9b77200 R14: ffff88809cf72d70 R15: ffff8880b31efc88
FAT-fs (loop5): Filesystem has been set read-only
 btrfs_start_delalloc_flush fs/btrfs/transaction.c:1924 [inline]
 btrfs_commit_transaction+0x1bb1/0x2480 fs/btrfs/transaction.c:2075
 transaction_kthread+0x385/0x483 fs/btrfs/disk-io.c:1794
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Kernel Offset: disabled
Rebooting in 86400 seconds..