Re: [syzbot] [block?] BUG: corrupted list in blk_mq_request_bypass_insert

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    5445d6419962 arm64: Don't read GMID_EL1 when MTE is disabled
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=121f2115580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=56ed23170c168d4c
dashboard link: https://syzkaller.appspot.com/bug?extid=f4353e96f7004ae5a09e
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=161f2115580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=110a75f9580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e8b70e3bd109/disk-5445d641.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e5227e56ac93/vmlinux-5445d641.xz
kernel image: https://storage.googleapis.com/syzbot-assets/54905f78be59/Image-5445d641.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f4353e96f7004ae5a09e@xxxxxxxxxxxxxxxxxxxxxxxxx

 non-slab/vmalloc memory
list_add corruption. prev->next should be next (ffff0000c7fc2840), but was ffff0000c83b0048. (prev=ffff0000c83b0048).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:34!
Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 4354 Comm: kworker/0:1H Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
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 : ffff800094547a10
x29: ffff800094547a10 x28: ffff800094547ac8 x27: ffff800094547ac0
x26: 1fffe00018ff8509 x25: ffff0000c7fc2840 x24: ffff0000c7fc2848
x23: 1fffe00019076009 x22: dfff800000000000 x21: ffff0000c83b0048
x20: ffff0000c83b0048 x19: ffff0000c7fc2840 x18: 1fffe00035b9ec28
x17: 3034383263663763 x16: 3030303066666666 x15: 28207478656e2065
x14: 6220646c756f6873 x13: 0000000000000001 x12: 0000000000000003
x11: 0000000000000000 x10: 0000000000000002 x9 : 1fe110670cc49300
x8 : 1fe110670cc49300 x7 : ffff80008048e314 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080498f8c
x2 : 0000000100000001 x1 : ffff0000d6353b00 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 ]---


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