syzbot


BUG: unable to handle kernel paging request in do_xmote

Status: upstream: reported C repro on 2024/11/11 09:16
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+9a789d2aba8a28f2b5f9@syzkaller.appspotmail.com
First crash: 188d, last: 28d
Fix bisection: failed (error log, bisect log)
  
Bug presence (2)
Date Name Commit Repro Result
2024/11/12 linux-5.15.y (ToT) 3c17fc483905 C [report] BUG: unable to handle kernel paging request in do_xmote
2024/11/12 upstream (ToT) 3022e9d00ebe C Didn't crash
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 BUG: unable to handle kernel paging request in do_xmote origin:lts-only C inconclusive 5 29d 393d 0/3 upstream: reported C repro on 2024/04/19 23:45
upstream general protection fault in do_xmote gfs2 C error unreliable 16 838d 960d 0/28 auto-obsoleted due to no activity on 2023/05/31 20:52
upstream KASAN: slab-use-after-free Read in do_xmote gfs2 1 346d 342d 0/28 auto-obsoleted due to no activity on 2024/09/04 18:24
Last patch testing requests (2)
Created Duration User Patch Repo Result
2025/04/20 18:27 12m retest repro linux-5.15.y report log
2025/03/09 04:06 12m retest repro linux-5.15.y report log

Sample crash report:
Unable to handle kernel paging request at virtual address dfff800000000097
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: 227 Comm: kworker/1:1H Not tainted 5.15.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: glock_workqueue glock_work_func
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : is_system_glock fs/gfs2/glock.c:693 [inline]
pc : do_xmote+0xba0/0x1054 fs/gfs2/glock.c:801
lr : do_xmote+0xb6c/0x1054 fs/gfs2/glock.c:798
sp : ffff80001f227a20
x29: ffff80001f227a60 x28: dfff800000000000 x27: ffff0000d36b4000
x26: ffff0000e35a45a8 x25: dfff800000000000 x24: 00000000000004b8
x23: ffff0000e35a45b0
 x22: ffff0000e35a4568
 x21: 0000000000000000

x20: dfff800000000000
 x19: ffff0000e35a4548
 x18: 0000000000000000

x17: 0000000000000000
 x16: ffff80000824f3a0
 x15: 0000000000000406

x14: 1ffff0000296e06c
 x13: dfff800000000000
 x12: 0000000000000001

x11: 0000000000000000
 x10: 0000000000000000
 x9 : ffff0000c67c0000

x8 : 0000000000000097
 x7 : ffff80000a9f233c
 x6 : 0000000000000000

x5 : 0000000000000000
 x4 : 0000000000000001
 x3 : ffff800008306180

x2 : 0000000000000001
 x1 : 0000000000004000
 x0 : 0000000000000000

Call trace:
 is_system_glock fs/gfs2/glock.c:693 [inline]
 do_xmote+0xba0/0x1054 fs/gfs2/glock.c:801
 run_queue+0x3f8/0x6bc fs/gfs2/glock.c:872
 glock_work_func+0x27c/0x470 fs/gfs2/glock.c:1039
 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310
 worker_thread+0x910/0x1034 kernel/workqueue.c:2457
 kthread+0x37c/0x45c kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
Code: d2d00014 f2fbfff4 9112e118 d343ff08 (38796908) 
---[ end trace 825386583b63214f ]---
----------------
Code disassembly (best guess):
   0:	d2d00014 	mov	x20, #0x800000000000        	// #140737488355328
   4:	f2fbfff4 	movk	x20, #0xdfff, lsl #48
   8:	9112e118 	add	x24, x8, #0x4b8
   c:	d343ff08 	lsr	x8, x24, #3
* 10:	38796908 	ldrb	w8, [x8, x25] <-- trapping instruction

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/06 14:53 linux-5.15.y 0c935c049b5c 1c65791e .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2024/11/11 22:14 linux-5.15.y 3c17fc483905 0c4b1325 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
2024/11/11 09:15 linux-5.15.y 3c17fc483905 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 BUG: unable to handle kernel paging request in do_xmote
* Struck through repros no longer work on HEAD.