BUG: unable to handle kernel paging request in do_xmote

Status: upstream: reported C repro on 2024/04/19 23:45
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+84d8457bab87b374f232@syzkaller.appspotmail.com
First crash: 827d, last: 46d
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2024/04/20 linux-6.1.y (ToT) 6741e066ec76 C [report] BUG: unable to handle kernel paging request in do_xmote
2024/04/20 upstream (ToT) 13a2e429f644 C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 BUG: unable to handle kernel paging request in do_xmote origin:lts-only 8 C error 5 28d 621d 0/3 upstream: reported C repro on 2024/11/11 09:16
upstream general protection fault in do_xmote gfs2 10 C error unreliable 16 1271d 1393d 0/29 auto-obsoleted due to no activity on 2023/05/31 20:52
upstream KASAN: slab-use-after-free Read in do_xmote gfs2 19 1 779d 775d 0/29 auto-obsoleted due to no activity on 2024/09/04 18:24
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2024/05/18 00:01 2h24m fix candidate upstream OK (0) job log

Sample crash report:
Unable to handle kernel paging request at virtual address dfff800000000097
KASAN: null-ptr-deref in range [0x00000000000004b8-0x00000000000004bf]
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
[dfff800000000097] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 51 Comm: kworker/1:1H Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: glock_workqueue glock_work_func
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : is_system_glock fs/gfs2/glock.c:724 [inline]
pc : do_xmote+0xb20/0x1174 fs/gfs2/glock.c:833
lr : do_xmote+0xafc/0x1174 fs/gfs2/glock.c:830
sp : ffff80001cfd7a40
x29: ffff80001cfd7a60 x28: dfff800000000000 x27: 1fffe0001bccc8b5
x26: ffff0000d4ca0000 x25: ffff0000de6645a8 x24: 0000000000000012
x23: 00000000000004b8 x22: 0000000000000000 x21: 0000000000000000
x20: ffff0000d4ca0000 x19: ffff0000de664548 x18: 0000000000000000
x17: ffff800018381000 x16: ffff8000082efb0c x15: ffff800017e62000
x14: 0000000000000001 x13: 1fffe0001bccc8ad x12: 0000000000ff0100
x11: ff0080000a1df55c x10: 0000000000000000 x9 : ffff80000a1df55c
x8 : 0000000000000097 x7 : ffff80000a873aa8 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000082efc20
x2 : 0000000000000001 x1 : 0000000000004000 x0 : 0000000000000000
Call trace:
 is_system_glock fs/gfs2/glock.c:724 [inline]
 do_xmote+0xb20/0x1174 fs/gfs2/glock.c:833
 run_queue+0x3b4/0x67c fs/gfs2/glock.c:905
 glock_work_func+0x1fc/0x41c fs/gfs2/glock.c:1089
 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292
 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: 979c2306 f94002e8 9112e117 d343fee8 (387c6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	979c2306 	bl	0xfffffffffe708c18
   4:	f94002e8 	ldr	x8, [x23]
   8:	9112e117 	add	x23, x8, #0x4b8
   c:	d343fee8 	lsr	x8, x23, #3
* 10:	387c6908 	ldrb	w8, [x8, x28] <-- trapping instruction

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/10 08:23 linux-6.1.y 228da13e907e 34dab4be .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2026/01/06 03:53 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2025/04/19 12:15 linux-6.1.y 420102835862 2a20f901 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2024/04/20 02:52 linux-6.1.y 6741e066ec76 af24b050 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2026/06/10 06:51 linux-6.1.y 228da13e907e 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2026/06/10 06:50 linux-6.1.y 228da13e907e 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2026/01/06 01:30 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2025/12/02 05:33 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2025/12/02 05:33 linux-6.1.y f6e38ae624cf d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2025/09/17 20:53 linux-6.1.y 3db754f56897 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2025/08/26 13:33 linux-6.1.y 0bc96de781b4 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2025/04/19 10:22 linux-6.1.y 420102835862 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2024/04/21 23:52 linux-6.1.y 6741e066ec76 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2024/04/19 23:45 linux-6.1.y 6741e066ec76 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2026/02/03 18:17 linux-6.1.y cd9b81672742 6df4c87a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in do_xmote
* Struck through repros no longer work on HEAD.