linux-kernel - [syzbot] [net?] WARNING: locking bug in netpoll_poll

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-ID: <67850639.050a0220.216c54.0050.GAE@google.com>
Date: Mon, 13 Jan 2025 04:25:29 -0800
From: syzbot <syzbot+54f9a6de31e425e46ace@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] WARNING: locking bug in netpoll_poll_disable (2)

Hello,

syzbot found the following issue on:

HEAD commit:    577490b6abb9 Merge branches 'for-next/core' and 'for-next/..
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=134b270f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5408fc4cf982e2c4
dashboard link: https://syzkaller.appspot.com/bug?extid=54f9a6de31e425e46ace
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/f9a89a276c80/disk-577490b6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6c19133a4de5/vmlinux-577490b6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0dde1fa5fad3/Image-577490b6.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+54f9a6de31e425e46ace@...kaller.appspotmail.com

bridge0: port 1(bridge_slave_0) entered disabled state
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 0 PID: 7557 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4850 [inline]
WARNING: CPU: 0 PID: 7557 at kernel/locking/lockdep.c:232 __lock_acquire+0x7b0/0x7904 kernel/locking/lockdep.c:5176
Modules linked in:
CPU: 0 UID: 0 PID: 7557 Comm: kworker/u8:12 Tainted: G        W          6.13.0-rc6-syzkaller-g577490b6abb9 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: netns cleanup_net
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : check_wait_context kernel/locking/lockdep.c:4850 [inline]
pc : __lock_acquire+0x7b0/0x7904 kernel/locking/lockdep.c:5176
lr : hlock_class kernel/locking/lockdep.c:232 [inline]
lr : check_wait_context kernel/locking/lockdep.c:4850 [inline]
lr : __lock_acquire+0x7a4/0x7904 kernel/locking/lockdep.c:5176
sp : ffff80009eff7040
x29: ffff80009eff7300 x28: ffff0000d7a60000 x27: ffff0000d7a60b40
x26: 1fffe0001af4c168 x25: 0000000000000000 x24: 0000000000000001
x23: ffff0000d7a60a78 x22: ffff0000d7a60b20 x21: ffff0000d7a60b44
x20: 00000000000015c5 x19: ffff8000931c7a78 x18: ffff80009eff6738
x17: 0000000000000000 x16: ffff8000803b4180 x15: 0000000000000001
x14: 1ffff00011f49f9c x13: dfff800000000000 x12: 0000000000000000
x11: 0000000000000003 x10: 0000000000ff0100 x9 : 0c98272ec0943100
x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff8000804a69fc
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008047cc34
x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000
Call trace:
 check_wait_context kernel/locking/lockdep.c:4850 [inline] (P)
 __lock_acquire+0x7b0/0x7904 kernel/locking/lockdep.c:5176 (P)
 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
 down+0x3c/0xe8 kernel/locking/semaphore.c:59
 netpoll_poll_disable+0xe8/0x100 net/core/netpoll.c:222
 __dev_close_many+0x104/0x3c8 net/core/dev.c:1532
 dev_close_many+0x1e0/0x474 net/core/dev.c:1585
 unregister_netdevice_many_notify+0x454/0x1c6c net/core/dev.c:11502
 unregister_netdevice_many+0x28/0x38 net/core/dev.c:11592
 cleanup_net+0x5c8/0xa34 net/core/net_namespace.c:643
 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3391
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862
irq event stamp: 489272
hardirqs last  enabled at (489271): [<ffff80008030e224>] __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:394
hardirqs last disabled at (489272): [<ffff80008b6c638c>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (489272): [<ffff80008b6c638c>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162
softirqs last  enabled at (489270): [<ffff8000861788ac>] pppoe_flush_dev drivers/net/ppp/pppoe.c:327 [inline]
softirqs last  enabled at (489270): [<ffff8000861788ac>] pppoe_device_event+0x464/0x4a0 drivers/net/ppp/pppoe.c:346
softirqs last disabled at (489268): [<ffff800086178530>] pppoe_flush_dev drivers/net/ppp/pppoe.c:279 [inline]
softirqs last disabled at (489268): [<ffff800086178530>] pppoe_device_event+0xe8/0x4a0 drivers/net/ppp/pppoe.c:346
---[ end trace 0000000000000000 ]---
Unable to handle kernel paging request at virtual address dfff800000000018
KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7]
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[dfff800000000018] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:

CPU: 0 UID: 0 PID: 7557 Comm: kworker/u8:12 Tainted: G        W          6.13.0-rc6-syzkaller-g577490b6abb9 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: netns cleanup_net
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : check_wait_context kernel/locking/lockdep.c:4850 [inline]
pc : __lock_acquire+0x574/0x7904 kernel/locking/lockdep.c:5176
lr : hlock_class kernel/locking/lockdep.c:232 [inline]
lr : check_wait_context kernel/locking/lockdep.c:4850 [inline]
lr : __lock_acquire+0x7a4/0x7904 kernel/locking/lockdep.c:5176
sp : ffff80009eff7040
x29: ffff80009eff7300 x28: ffff0000d7a60000 x27: ffff0000d7a60b40
x26: 1fffe0001af4c168 x25: 0000000000000000 x24: 0000000000000001
x23: ffff0000d7a60a78 x22: ffff0000d7a60b20 x21: 00000000000000c4
x20: 00000000000015c5 x19: ffff8000931c7a78 x18: ffff80009eff6738

x17: 0000000000000000
 x16: ffff8000803b4180
 x15: 0000000000000001
x14: 1ffff00011f49f9c x13: dfff800000000000 x12: 0000000000000000
x11: 0000000000000003 x10: 0000000000ff0100 x9 : 0c98272ec0943100

x8 : 0000000000000018
 x7 : 4e5241575f534b43
 x6 : ffff8000804a69fc

x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008047cc34
x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000

Call trace:
 check_wait_context kernel/locking/lockdep.c:4850 [inline] (P)
 __lock_acquire+0x574/0x7904 kernel/locking/lockdep.c:5176 (P)
 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
 down+0x3c/0xe8 kernel/locking/semaphore.c:59
 netpoll_poll_disable+0xe8/0x100 net/core/netpoll.c:222
 __dev_close_many+0x104/0x3c8 net/core/dev.c:1532
 dev_close_many+0x1e0/0x474 net/core/dev.c:1585
 unregister_netdevice_many_notify+0x454/0x1c6c net/core/dev.c:11502
 unregister_netdevice_many+0x28/0x38 net/core/dev.c:11592
 cleanup_net+0x5c8/0xa34 net/core/net_namespace.c:643
 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3391
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862
Code: 34000fa8 aa1f03e8 91031115 d343fea8 (38ed6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	34000fa8 	cbz	w8, 0x1f4
   4:	aa1f03e8 	mov	x8, xzr
   8:	91031115 	add	x21, x8, #0xc4
   c:	d343fea8 	lsr	x8, x21, #3
* 10:	38ed6908 	ldrsb	w8, [x8, x13] <-- 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.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup