BUG: unable to handle kernel paging request in call_usermodehelper_exec_async

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: bbed346d5a96 Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1497060e880000
kernel config: https://syzkaller.appspot.com/x/.config?x=3a4a45d2d827c1e
dashboard link: https://syzkaller.appspot.com/bug?extid=10d19d528d9755d9af22
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
CC: [linux-...@vger.kernel.org mcg...@kernel.org]

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e8e91bc79312/disk-bbed346d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c1cb3fb3b77e/vmlinux-bbed346d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+10d19d...@syzkaller.appspotmail.com

Unable to handle kernel paging request at virtual address 000000009cb03193
Mem abort info:
ESR = 0x0000000096000004
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x04: level 0 translation fault
Data abort info:
ISV = 0, ISS = 0x00000004
CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=0000000158178000
[000000009cb03193] pgd=0000000000000000, p4d=0000000000000000
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 8602 Comm: modprobe Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923
lr : lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
sp : ffff8000211a3c40
x29: ffff8000211a3d20 x28: 0000000000000000 x27: 00000000000000c0
x26: 000000009cb03193 x25: ffff8000081873d0 x24: 0000000000000080
x23: 0000000000000000 x22: 000000009cb03193 x21: 0000000000000000
x20: 0000000000000000 x19: 0000000000000000 x18: 000000006bcf960d
x17: 00000000398fa029 x16: ffff80000db49158 x15: ffff0001183eb500
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0001183eb500
x11: ff808000095d19c0 x10: 0000000000000000 x9 : 0000000000000001
x8 : 0000000000000001 x7 : ffff8000081873d0 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 000000009cb03193
Call trace:
__lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923
lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x6c/0xb4 kernel/locking/spinlock.c:162
complete+0x24/0x90 kernel/sched/completion.c:32
umh_complete kernel/umh.c:58 [inline]
call_usermodehelper_exec_async+0x15c/0x214 kernel/umh.c:122
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
Code: 2a0303f4 2a0203f7 aa0003fa 34000148 (f9400348)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 2a0303f4 mov w20, w3
4: 2a0203f7 mov w23, w2
8: aa0003fa mov x26, x0
c: 34000148 cbz w8, 0x34
* 10: f9400348 ldr 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.