syzbot
BUG: corrupted list in blk_mq_request_bypass_insert
Status:
upstream: reported on 2026/08/29 05:31
Subsystems:
block
Labels:
prio:high
[Documentation on labels]
Reported-by: syzbot+f4353e96f7004ae5a09e@syzkaller.appspotmail.com
First crash: 15d, last: 2d03h
Sample crash report:
non-slab/vmalloc memory
list_add corruption. prev->next should be next (ffff0000c82f0040), but was ffff800094247ac0. (prev=ffff0000c84f7648).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:34!
Internal error: Oops - BUG: 00000000f2000800 [#1] SMP
Modules linked in:
CPU: 1 UID: 0 PID: 4352 Comm: kworker/1:1H Tainted: G L syzkaller #0 PREEMPT
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Workqueue: kblockd blk_mq_requeue_work
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __list_add_valid_or_report+0x144/0x148 lib/list_debug.c:32
lr : __list_add_valid_or_report+0x144/0x148 lib/list_debug.c:32
sp : ffff800094247a10
x29: ffff800094247a10 x28: ffff0000c84f4a50 x27: ffff0000c84f4a48
x26: 1fffe0001905e009 x25: ffff0000c82f0040 x24: ffff0000c82f0048
x23: 1fffe0001909eec9 x22: dfff800000000000 x21: ffff0000c84f4848
x20: ffff0000c84f7648 x19: ffff0000c82f0040 x18: 1fffe00035ba3828
x17: 3034303066323863 x16: 3030303066666666 x15: 28207478656e2065
x14: 6220646c756f6873 x13: 0000000000000001 x12: 0000000000000003
x11: 0000000000000000 x10: 0000000000000002 x9 : 0f71f26900eba100
x8 : 0f71f26900eba100 x7 : ffff80008048e314 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080498f8c
x2 : 0000000100000001 x1 : ffff0000c39bd880 x0 : 0000000000000075
Call trace:
__list_add_valid_or_report+0x144/0x148 lib/list_debug.c:32 (P)
__list_add_valid include/linux/list.h:104 [inline]
__list_add include/linux/list.h:169 [inline]
list_add_tail include/linux/list.h:206 [inline]
blk_mq_request_bypass_insert+0x130/0x1cc block/blk-mq.c:2551
blk_mq_requeue_work+0x3a4/0x52c block/blk-mq.c:1560
process_one_work kernel/workqueue.c:3387 [inline]
process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3470
worker_thread+0x798/0xbd0 kernel/workqueue.c:3551
kthread+0x304/0x3d4 kernel/kthread.c:436
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838
Code: 91170000 aa1303e1 aa1403e3 979ab1d1 (d4210000)
---[ end trace 0000000000000000 ]---
* Struck through repros no longer work on HEAD.