syzbot
BUG: unable to handle kernel paging request in xlog_cil_pcp_dead
Status:
upstream: reported on 2026/07/26 04:27
Reported-by: syzbot+c581bb42ab36d9a493dc@syzkaller.appspotmail.com
First crash: 20d, last: 9h14m
Sample crash report:
psci: CPU1 killed (polled 0 ms)
Unable to handle kernel paging request at virtual address dfff800000000002
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
Mem abort info:
ESR = 0x0000000096000006
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
Data abort info:
ISV = 0, ISS = 0x00000006
CM = 0, WnR = 0
[dfff800000000002] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4375 Comm: kworker/0:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Workqueue: events work_for_cpu_fn
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : xlog_cil_pcp_dead+0x3c/0x468 fs/xfs/xfs_log_cil.c:1806
lr : xlog_cil_pcp_dead+0x34/0x468 fs/xfs/xfs_log_cil.c:1805
sp : ffff800020cb7970
x29: ffff800020cb7970 x28: ffff8000153f7810 x27: 0000000000000000
x26: 1ffff00002a7ef04 x25: ffff8000159a7d00 x24: dfff800000000000
x23: dfff800000000000 x22: ffff0000ff12a000 x21: ffff0000ff12a140
x20: 0000000000000010 x19: 0000000000000001 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff800011b90080 x15: 000000000004ffff
x14: 0000000000000001 x13: 1fffff7ffdff5e1b x12: 0000000000000000
x11: ff00800009b5e070 x10: 0000000000000000 x9 : ffff800009b5e070
x8 : 0000000000000002 x7 : ffff80000820d17c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000081fcabc
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
xlog_cil_pcp_dead+0x3c/0x468 fs/xfs/xfs_log_cil.c:1806
xfs_cpu_dead+0xa4/0xf8 fs/xfs/xfs_super.c:2260
cpuhp_invoke_callback+0x390/0x6dc kernel/cpu.c:192
__cpuhp_invoke_callback_range kernel/cpu.c:700 [inline]
cpuhp_invoke_callback_range kernel/cpu.c:724 [inline]
cpuhp_down_callbacks kernel/cpu.c:1157 [inline]
_cpu_down+0x44c/0xb10 kernel/cpu.c:1218
__cpu_down_maps_locked+0x48/0x9c kernel/cpu.c:1249
work_for_cpu_fn+0x60/0x94 kernel/workqueue.c:5184
process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
kthread+0x254/0x2e0 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: f2fbfff7 97a552d6 91004294 d343fe88 (38776908)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: f2fbfff7 movk x23, #0xdfff, lsl #48
4: 97a552d6 bl 0xfffffffffe954b5c
8: 91004294 add x20, x20, #0x10
c: d343fe88 lsr x8, x20, #3
* 10: 38776908 ldrb w8, [x8, x23] <-- trapping instruction
* Struck through repros no longer work on HEAD.