syzbot
BUG: unable to handle kernel paging request in blk_mq_complete_request_remote
Status:
upstream: reported on 2026/08/27 10:07
Subsystems:
block
Labels:
prio:high
[Documentation on labels]
Reported-by: syzbot+2e3bf0bd49acd9b21d4b@syzkaller.appspotmail.com
First crash: 14d, last: 17h08m
Sample crash report:
nvme nvme0: Disabling device after reset failure: -19
Unable to handle kernel paging request at virtual address dfff800000000031
KASAN: null-ptr-deref in range [0x0000000000000188-0x000000000000018f]
Mem abort info:
ESR = 0x0000000096000005
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x05: level 1 translation fault
Data abort info:
ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0
[dfff800000000031] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1] SMP
Modules linked in:
CPU: 1 UID: 0 PID: 8131 Comm: kworker/u8:49 Not tainted syzkaller #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Workqueue: nvme-reset-wq nvme_reset_work
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : blk_mq_complete_request_remote+0xc4/0x858 block/blk-mq.c:1297
lr : blk_mq_complete_request_remote+0x88/0x858 block/blk-mq.c:1289
sp : ffff800095c87920
x29: ffff800095c879a0 x28: ffff800095c87920 x27: 1fffe0001901e04c
x26: 0000000000000503 x25: ffff0000c80f026e x24: dfff800000000000
x23: ffff700012b90f24 x22: 1fffe00019114ba4 x21: ffff0000c88a5d24
x20: 000000000000018e x19: ffff0000c88a5c00 x18: 00000000ffffffff
x17: 0000000000000003 x16: ffff800088bf7000 x15: ffff80008285f1f0
x14: 00000000ffff8000 x13: 0000000000000001 x12: 0000000000000003
x11: ffff80008a6a6e28 x10: ffff8000885721a6 x9 : 1fffe00019114b82
x8 : 0000000000000031 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff80008285f010
x2 : 0000000000000000 x1 : ffff0000c8cdd880 x0 : 0000000000000000
Call trace:
blk_mq_complete_request_remote+0xc4/0x858 block/blk-mq.c:1297 (P)
nvme_try_complete_req drivers/nvme/host/nvme.h:836 [inline]
nvme_handle_cqe drivers/nvme/host/pci.c:1601 [inline]
nvme_poll_cq+0x544/0x1128 drivers/nvme/host/pci.c:1632
nvme_reap_pending_cqes drivers/nvme/host/pci.c:2090 [inline]
nvme_dev_disable+0x384/0x540 drivers/nvme/host/pci.c:3344
nvme_reset_work+0x510/0x69c drivers/nvme/host/pci.c:3506
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: 97cf5d15 f9400288 91063914 d343fe88 (38f86908)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 97cf5d15 bl 0xffffffffff3d7454
4: f9400288 ldr x8, [x20]
8: 91063914 add x20, x8, #0x18e
c: d343fe88 lsr x8, x20, #3
* 10: 38f86908 ldrsb w8, [x8, x24] <-- trapping instruction
* Struck through repros no longer work on HEAD.