------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 8381 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8381 Comm: io_wqe_worker-1 Not tainted 5.9.0-rc4-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:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28
Code: c7 fa 97 15 89 31 c0 e8 63 28 a6 fd 0f 0b eb 85 e8 ca 89 d4 fd c6 05 76 82 ea 05 01 48 c7 c7 26 98 15 89 31 c0 e8 45 28 a6 fd <0f> 0b e9 64 ff ff ff e8 a9 89 d4 fd c6 05 56 82 ea 05 01 48 c7 c7
RSP: 0018:ffffc90019967db8 EFLAGS: 00010246
RAX: f3fd97a443314e00 RBX: 0000000000000003 RCX: ffff88800cfc6400
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffff815e27d0 R09: ffffed1015d062c0
R10: ffffed1015d062c0 R11: 0000000000000000 R12: ffff8880918998b8
R13: dffffc0000000000 R14: ffff8880a8360500 R15: ffff88809e3b9530
 refcount_sub_and_test include/linux/refcount.h:274 [inline]
 refcount_dec_and_test include/linux/refcount.h:294 [inline]
 io_worker_exit+0x63f/0x750 fs/io-wq.c:236
 io_wqe_worker+0x799/0x810 fs/io-wq.c:596
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Kernel Offset: disabled
Rebooting in 86400 seconds..