[v5.15] BUG: unable to handle kernel paging request in do_sync

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: f7347f400572 Linux 5.15.180
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16b8c470580000
kernel config: https://syzkaller.appspot.com/x/.config?x=8514568d0dc3fae1
dashboard link: https://syzkaller.appspot.com/bug?extid=978a174400508a094b8c
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bfa4c842c4d0/disk-f7347f40.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fbfde6903046/vmlinux-f7347f40.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5621c3ff7dd3/Image-f7347f40.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+978a17...@syzkaller.appspotmail.com

gfs2_glock_nq+0xa60/0x144c fs/gfs2/glock.c:1534
gfs2_glock_nq_init fs/gfs2/glock.h:246 [inline]
do_sync+0x404/0xaf8 fs/gfs2/quota.c:927
gfs2_quota_sync+0x2e8/0x548 fs/gfs2/quota.c:1329
quotad_check_timeo fs/gfs2/quota.c:1519 [inline]
gfs2_quotad+0x380/0x788 fs/gfs2/quota.c:1586
kthread+0x37c/0x45c kernel/kthread.c:334
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
Unable to handle kernel paging request at virtual address dfff800000000002
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: 1 PID: 4156 Comm: gfs2_quotad Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : do_sync+0x8c4/0xaf8 fs/gfs2/quota.c:986
lr : do_sync+0x8a0/0xaf8 fs/gfs2/quota.c:985
sp : ffff8000200c7a60
x29: ffff8000200c7ba0 x28: 0000000000000001 x27: ffff700004018f58
x26: dfff800000000000 x25: 00000000fffffffb x24: ffff0000c77e1700
x23: 0000000000000001 x22: ffff0000e8e23640 x21: ffff8000200c7b20
x20: 0000000000000000 x19: 0000000000000000 x18: ffff8000200c75a0
x17: ffff80000a372870 x16: ffff8000082ed198 x15: ffff8000088cd1c4
x14: ffff8000088d17ec x13: ffff80000802b56c x12: 0000000000000003
x11: 0000000000000000 x10: 0000000000000000 x9 : 90490030abe61800
x8 : 0000000000000002 x7 : 0000000000000000 x6 : ffff8000088d5cb8
x5 : ffff0000e9c59140 x4 : 0000000000000000 x3 : ffff800008046154
x2 : 0000000000000006 x1 : ffff800011cbabe0 x0 : 0000000000000010
Call trace:
do_sync+0x8c4/0xaf8 fs/gfs2/quota.c:986
gfs2_quota_sync+0x2e8/0x548 fs/gfs2/quota.c:1329
quotad_check_timeo fs/gfs2/quota.c:1519 [inline]
gfs2_quotad+0x380/0x788 fs/gfs2/quota.c:1586
kthread+0x37c/0x45c kernel/kthread.c:334
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
Code: 9795a169 f9400294 91004280 d343fc08 (387a6908)
---[ end trace e299648a53590e22 ]---
----------------
Code disassembly (best guess):
0: 9795a169 bl 0xfffffffffe5685a4
4: f9400294 ldr x20, [x20]
8: 91004280 add x0, x20, #0x10
c: d343fc08 lsr x8, x0, #3
* 10: 387a6908 ldrb w8, [x8, x26] <-- trapping instruction


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.