------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 8769 at lib/refcount.c:28 refcount_warn_saturate+0x103/0x1f0 lib/refcount.c:28
Modules linked in:
CPU: 1 PID: 8769 Comm: syz-executor.6 Not tainted 5.10.52 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:refcount_warn_saturate+0x103/0x1f0 lib/refcount.c:28
Code: 1d d2 63 54 03 31 ff 89 de e8 c9 22 51 ff 84 db 75 a3 e8 90 29 51 ff 48 c7 c7 20 38 3b 84 c6 05 b2 63 54 03 01 e8 cc 0c c9 01 <0f> 0b eb 87 e8 74 29 51 ff 0f b6 1d 9b 63 54 03 31 ff 89 de e8 94
RSP: 0018:ffff88804ec5f9f8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff81293053 RDI: ffffed1009d8bf31
RBP: ffff888048ceb41c R08: 0000000000000001 R09: ffff88806cf1ff9b
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888048ceb41c
R13: 0000000000000000 R14: ffff888048ceb558 R15: ffff88800c857180
FS:  00007f0e798e9700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558bbbc7d898 CR3: 0000000048fb6000 CR4: 0000000000350ee0
Call Trace:
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 io_put_req+0xc6/0x100 fs/io_uring.c:2220
 __io_queue_sqe+0x2b1/0xd00 fs/io_uring.c:6358
 io_queue_sqe+0x5bc/0x1020 fs/io_uring.c:6403
 io_queue_link_head fs/io_uring.c:6414 [inline]
 io_submit_sqe fs/io_uring.c:6455 [inline]
 io_submit_sqes+0x17b5/0x2310 fs/io_uring.c:6700
 __do_sys_io_uring_enter+0x1092/0x1910 fs/io_uring.c:9092
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0e798e9188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000000000000 RSI: 00000000000058ab RDI: 0000000000000004
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffdbe4f1c5f R14: 00007f0e798e9300 R15: 0000000000022000
irq event stamp: 1473
hardirqs last  enabled at (1483): [<ffffffff8128f5d9>] console_unlock+0x929/0xb30 kernel/printk/printk.c:2552
hardirqs last disabled at (1494): [<ffffffff83c43a7b>] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095
softirqs last  enabled at (1072): [<ffffffff83e00f92>] asm_call_irq_on_stack+0x12/0x20
softirqs last disabled at (1067): [<ffffffff83e00f92>] asm_call_irq_on_stack+0x12/0x20
---[ end trace 066547b839c41a45 ]---
EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue
ext4 filesystem being mounted at /syzkaller-testdir101633600/syzkaller.jlzrVm/97/file0 supports timestamps until 2038 (0x7fffffff)
FAT-fs (loop7): Unrecognized mount option "" or missing value
EXT4-fs error (device loop2): ext4_validate_block_bitmap:398: comm syz-executor.2: bg 0: block 2: invalid block bitmap
EXT4-fs error (device loop2): ext4_empty_dir:2876: inode #12: comm syz-executor.2: Directory hole found for htree leaf block
EXT4-fs error (device loop2): ext4_free_inode:353: comm syz-executor.2: bit already cleared for inode 12