BUG: corrupted list in process_scheduled_works

Status: moderation: reported on 2026/09/05 07:36
Subsystems: block
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+965ff2a20de4a9ea44fa@syzkaller.appspotmail.com
First crash: 4d00h, last: 4d00h
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
14f067bb assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ✅ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ BUG: corrupted list in process_scheduled_works 2026/09/03 01:18 2026/09/03 01:18 2026/09/03 01:46 9941e97d
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-use-after-free Read in process_scheduled_works kernel 19 8 392d 648d 0/29 auto-obsoleted due to no activity on 2025/11/16 09:13
linux-6.6 general protection fault in process_scheduled_works origin:upstream 2 syz, C error 43 172d 430d 0/2 upstream: reported C repro on 2025/07/02 00:12

Sample crash report:
 non-slab/vmalloc memory
list_del corruption. next->prev should be ffff0000c9271c48, but was ffff800093417aa0. (next=ffff0000c9271c48)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:67!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 4388 Comm: kworker/0:1H 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_del_entry_valid_or_report+0x1b4/0x1b8 lib/list_debug.c:65
lr : __list_del_entry_valid_or_report+0x1b4/0x1b8 lib/list_debug.c:65
sp : ffff800093417a40
x29: ffff800093417a40 x28: ffff800093417aa0 x27: 1fffe00019049d65
x26: ffff0000c824eb28 x25: ffff800093417aa0 x24: dfff800000000000
x23: ffff0000c9271c50 x22: dfff800000000000 x21: 1fffe0001924e38a
x20: ffff0000c9271c48 x19: ffff0000c9271c48 x18: 1fffe00034bb7428
x17: 20747562202c3834 x16: 6331373239633030 x15: 3030666666662065
x14: 6220646c756f6873 x13: 0000000000000001 x12: ffff0000c81d9d40
x11: 0000000000000000 x10: 0000000000000001 x9 : 8202ecd0ec991c00
x8 : 8202ecd0ec991c00 x7 : ffff80008048c60c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008049731c
x2 : 0000000100000000 x1 : ffff0000c81d9d40 x0 : 000000000000006d
Call trace:
 __list_del_entry_valid_or_report+0x1b4/0x1b8 lib/list_debug.c:65 (P)
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:246 [inline]
 list_del_init include/linux/list.h:318 [inline]
 blk_mq_requeue_work+0x2b4/0x52c block/blk-mq.c:1552
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0x788/0x10b8 kernel/workqueue.c:3405
 worker_thread+0x798/0xbd0 kernel/workqueue.c:3486
 kthread+0x304/0x3d4 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838
Code: 91328000 aa1303e1 aa1403e3 979c2c05 (d4210000) 
---[ end trace 0000000000000000 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/01 07:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f1b8fa82cab7 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: corrupted list in process_scheduled_works
* Struck through repros no longer work on HEAD.