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: 31d, last: 29d
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 3 234d 236d 0/3 upstream: reported C repro on 2024/04/19 23:45
upstream general protection fault in do_xmote gfs2 C error unreliable 16 681d 803d 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 189d 185d 0/28 auto-obsoleted due to no activity on 2024/09/04 18:24

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: 0 PID: 226 Comm: kworker/0:1H Not tainted 5.15.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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 : ffff80001dea7a20
x29: ffff80001dea7a60 x28: dfff800000000000 x27: ffff0000cc684000
x26: ffff0000d72285a8 x25: dfff800000000000 x24: 00000000000004b8
x23: ffff0000d72285b0 x22: ffff0000d7228568 x21: 0000000000000000
x20: dfff800000000000 x19: ffff0000d7228548 x18: ffff80001dea76a0
x17: 0000000000000000 x16: ffff80000824ebd0 x15: 000000000000bd12
x14: 1ffff0000295a06a x13: dfff800000000000 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : ffff0000c67451c0
x8 : 0000000000000097 x7 : ffff80000a9630bc x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80000830598c
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 3ebfca443ce8270d ]---
----------------
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 (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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.