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Message-ID: <000000000000b4f0d505f5732704@google.com>
Date: Fri, 24 Feb 2023 06:43:39 -0800
From: syzbot <syzbot+ed63f5009044b5dc16ba@...kaller.appspotmail.com>
To: boqun.feng@...il.com, linux-kernel@...r.kernel.org,
longman@...hat.com, mingo@...hat.com, peterz@...radead.org,
syzkaller-bugs@...glegroups.com, will@...nel.org
Subject: [syzbot] [kernel?] WARNING: locking bug in call_usermodehelper_exec_work
Hello,
syzbot found the following issue on:
HEAD commit: 2d3827b3f393 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=15b1d290c80000
kernel config: https://syzkaller.appspot.com/x/.config?x=606ed7eeab569393
dashboard link: https://syzkaller.appspot.com/bug?extid=ed63f5009044b5dc16ba
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fd94d68ff17d/disk-2d3827b3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f304fbef0773/vmlinux-2d3827b3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/74eb318f51b0/Image-2d3827b3.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ed63f5009044b5dc16ba@...kaller.appspotmail.com
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 0 PID: 5159 at kernel/locking/lockdep.c:231 check_wait_context kernel/locking/lockdep.c:4729 [inline]
WARNING: CPU: 0 PID: 5159 at kernel/locking/lockdep.c:231 __lock_acquire+0x2c0/0x2f48 kernel/locking/lockdep.c:5005
Modules linked in:
CPU: 0 PID: 5159 Comm: kworker/u4:11 Not tainted 6.2.0-rc7-syzkaller-17907-g2d3827b3f393 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Workqueue: events_unbound call_usermodehelper_exec_work
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : check_wait_context kernel/locking/lockdep.c:4729 [inline]
pc : __lock_acquire+0x2c0/0x2f48 kernel/locking/lockdep.c:5005
lr : hlock_class kernel/locking/lockdep.c:231 [inline]
lr : check_wait_context kernel/locking/lockdep.c:4729 [inline]
lr : __lock_acquire+0x2a8/0x2f48 kernel/locking/lockdep.c:5005
sp : ffff80002054bb00
x29: ffff80002054bbe0 x28: ffff0000e74b2440 x27: ffff80000d2c49a4
x26: ffff0000e74b2420 x25: 0000000000000001 x24: 0000000000000000
x23: 0000000000000001 x22: 0000000000000000 x21: ffff0000e74b23d0
x20: 0000000000000002 x19: aaaaaaaaaaa31957 x18: 0000000000000000
x17: 000000000000ba7e x16: 0000000000000001 x15: ffff80000dbd2118
x14: ffff0000e74b1a00 x13: 0000000000000012 x12: ffff0000e74b1a00
x11: ffff80000dd94158 x10: 0000000000000000 x9 : da680f1092402900
x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff80000bf650d4
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000100000001 x0 : 0000000000000016
Call trace:
check_wait_context kernel/locking/lockdep.c:4729 [inline]
__lock_acquire+0x2c0/0x2f48 kernel/locking/lockdep.c:5005
lock_acquire+0x164/0x334 kernel/locking/lockdep.c:5668
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x68/0x88 kernel/locking/spinlock.c:162
complete+0x24/0x90 kernel/sched/completion.c:32
call_usermodehelper_exec_work+0x128/0x17c
process_one_work+0x3ac/0x9d0 kernel/workqueue.c:2289
worker_thread+0x340/0x608 kernel/workqueue.c:2436
kthread+0x12c/0x158 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
irq event stamp: 115998
hardirqs last enabled at (115997): [<ffff80000bf56d78>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last enabled at (115997): [<ffff80000bf56d78>] exit_to_kernel_mode+0xe8/0x118 arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (115998): [<ffff80000bf6a910>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (115998): [<ffff80000bf6a910>] _raw_spin_lock_irqsave+0x2c/0x88 kernel/locking/spinlock.c:162
softirqs last enabled at (115906): [<ffff80000bbed718>] spin_unlock_bh include/linux/spinlock.h:395 [inline]
softirqs last enabled at (115906): [<ffff80000bbed718>] ieee80211_ibss_work+0x170/0x9d8 net/mac80211/ibss.c:1701
softirqs last disabled at (115904): [<ffff80000bbed610>] spin_lock_bh include/linux/spinlock.h:355 [inline]
softirqs last disabled at (115904): [<ffff80000bbed610>] ieee80211_ibss_work+0x68/0x9d8 net/mac80211/ibss.c:1690
---[ end trace 0000000000000000 ]---
Unable to handle kernel NULL pointer dereference at virtual address 00000000000000b8
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
user pgtable: 4k pages, 48-bit VAs, pgdp=00000001274f6000
[00000000000000b8] pgd=0800000127562003, p4d=0800000127562003, pud=0800000109882003, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 5159 Comm: kworker/u4:11 Tainted: G W 6.2.0-rc7-syzkaller-17907-g2d3827b3f393 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Workqueue: events_unbound call_usermodehelper_exec_work
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : check_wait_context kernel/locking/lockdep.c:4729 [inline]
pc : __lock_acquire+0x2e0/0x2f48 kernel/locking/lockdep.c:5005
lr : hlock_class kernel/locking/lockdep.c:231 [inline]
lr : check_wait_context kernel/locking/lockdep.c:4729 [inline]
lr : __lock_acquire+0x2a8/0x2f48 kernel/locking/lockdep.c:5005
sp : ffff80002054bb00
x29: ffff80002054bbe0 x28: ffff0000e74b2440 x27: ffff80000d2c49a4
x26: ffff0000e74b2420 x25: 0000000000000001 x24: 0000000000000000
x23: 0000000000000001 x22: 0000000000000000 x21: ffff0000e74b23d0
x20: 0000000000000002 x19: aaaaaaaaaaa31957 x18: 0000000000000000
x17: 000000000000ba7e x16: 0000000000000001 x15: ffff80000dbd2118
x14: ffff0000e74b1a00 x13: 0000000000000012 x12: ffff0000e74b1a00
x11: ffff80000dd94158 x10: 0000000000000000 x9 : 00000000000c1957
x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff80000bf650d4
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000100000001 x0 : 0000000000000016
Call trace:
hlock_class kernel/locking/lockdep.c:222 [inline]
check_wait_context kernel/locking/lockdep.c:4730 [inline]
__lock_acquire+0x2e0/0x2f48 kernel/locking/lockdep.c:5005
lock_acquire+0x164/0x334 kernel/locking/lockdep.c:5668
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x68/0x88 kernel/locking/spinlock.c:162
complete+0x24/0x90 kernel/sched/completion.c:32
call_usermodehelper_exec_work+0x128/0x17c
process_one_work+0x3ac/0x9d0 kernel/workqueue.c:2289
worker_thread+0x340/0x608 kernel/workqueue.c:2436
kthread+0x12c/0x158 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
Code: 910461ef 9002dfeb 9105616b b9400389 (3942e118)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 910461ef add x15, x15, #0x118
4: 9002dfeb adrp x11, 0x5bfc000
8: 9105616b add x11, x11, #0x158
c: b9400389 ldr w9, [x28]
* 10: 3942e118 ldrb w24, [x8, #184] <-- trapping instruction
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
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https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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