blk_update_request: I/O error, dev nbd4, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev nbd4, logical block 0, async page read
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 263 at lib/refcount.c:28 refcount_warn_saturate+0x14e/0x1a0 lib/refcount.c:28
Modules linked in:
CPU: 1 PID: 263 Comm: kworker/1:1H Not tainted 5.15.106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Workqueue: kblockd blk_mq_run_work_fn
RIP: 0010:refcount_warn_saturate+0x14e/0x1a0 lib/refcount.c:28
Code: 09 01 48 c7 c7 20 14 d8 8a e8 fe d1 45 fd 0f 0b eb 8d e8 e5 ef 79 fd c6 05 e8 0b ca 09 01 48 c7 c7 80 14 d8 8a e8 e2 d1 45 fd <0f> 0b e9 6e ff ff ff e8 c6 ef 79 fd c6 05 ca 0b ca 09 01 48 c7 c7
RSP: 0018:ffffc900021577a8 EFLAGS: 00010246
RAX: 12de715e137b8c00 RBX: 0000000000000003 RCX: ffff888018605700
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffff816612ec R09: ffffed1017364f24
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801b2de000
R13: dffffc0000000000 R14: ffffc90002157a40 R15: ffff88801b848400
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2cb22000 CR3: 0000000071546000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 blk_mq_end_request block/blk-mq.c:577 [inline]
 blk_mq_dispatch_rq_list+0xc41/0x1f30 block/blk-mq.c:1392
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:200 [inline]
 blk_mq_do_dispatch_sched+0x755/0xd50 block/blk-mq-sched.c:214
 __blk_mq_sched_dispatch_requests+0x39b/0x490
 blk_mq_sched_dispatch_requests+0xec/0x160 block/blk-mq-sched.c:366
 __blk_mq_run_hw_queue+0x11a/0x1b0 block/blk-mq.c:1495
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2306
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2453
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>