linux-kernel - [syzbot] [pm?] WARNING: locking bug in netdev_unregister

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Message-ID: <000000000000367b800616b93c64@google.com>
Date: Mon, 22 Apr 2024 18:11:35 -0700
From: syzbot <syzbot+f3298e634aa801f1327e@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, len.brown@...el.com, 
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, pavel@....cz, 
	rafael@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [pm?] WARNING: locking bug in netdev_unregister_kobject (2)

Hello,

syzbot found the following issue on:

HEAD commit:    6a71d2909427 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=1321c763180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fca646cf17cc616b
dashboard link: https://syzkaller.appspot.com/bug?extid=f3298e634aa801f1327e
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/c77d21fa1405/disk-6a71d290.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/429fcd369816/vmlinux-6a71d290.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d3d8a4b85112/Image-6a71d290.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f3298e634aa801f1327e@...kaller.appspotmail.com

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 0 PID: 8958 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4773 [inline]
WARNING: CPU: 0 PID: 8958 at kernel/locking/lockdep.c:232 __lock_acquire+0x78c/0x763c kernel/locking/lockdep.c:5087
Modules linked in:
CPU: 0 PID: 8958 Comm: kbnepd bnep0 Not tainted 6.9.0-rc4-syzkaller-g6a71d2909427 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 604010c5 (nZCv daIF +PAN -UAO -TCO -DIT +SSBS BTYPE=--)
pc : check_wait_context kernel/locking/lockdep.c:4773 [inline]
pc : __lock_acquire+0x78c/0x763c kernel/locking/lockdep.c:5087
lr : hlock_class kernel/locking/lockdep.c:232 [inline]
lr : check_wait_context kernel/locking/lockdep.c:4773 [inline]
lr : __lock_acquire+0x780/0x763c kernel/locking/lockdep.c:5087
sp : ffff8000987272c0
x29: ffff800098727580 x28: ffff0000cc9bbc80 x27: ffff0000cc9bc788
x26: 1fffe000199378f1 x25: ffff0000cc9bc6f0 x24: 0000000000000001
x23: 0000000000000003 x22: 0000000000001df5 x21: ffff8000924bc7b8
x20: 0000000000000000 x19: ffff0000cc9bc78c x18: 0000000000000008
x17: 0000000000000000 x16: ffff80008ae725bc x15: 0000000000000001
x14: 1fffe000367b9602 x13: 0000000000000000 x12: dfff800000000000
x11: 0000000000000003 x10: 0000000000ff0100 x9 : 8484f82778db8800
x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800098726a38 x4 : ffff80008ef650a0 x3 : ffff8000805e616c
x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000
Call trace:
 check_wait_context kernel/locking/lockdep.c:4773 [inline]
 __lock_acquire+0x78c/0x763c kernel/locking/lockdep.c:5087
 lock_acquire+0x248/0x73c kernel/locking/lockdep.c:5754
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
 klist_next+0x8c/0x2e4 lib/klist.c:382
 next_device drivers/base/core.c:3970 [inline]
 device_for_each_child+0xc0/0x174 drivers/base/core.c:4048
 pm_runtime_set_memalloc_noio+0xf0/0x210 drivers/base/power/runtime.c:248
 netdev_unregister_kobject+0x148/0x208 net/core/net-sysfs.c:2106
 unregister_netdevice_many_notify+0x117c/0x1770 net/core/dev.c:11129
 unregister_netdevice_many net/core/dev.c:11157 [inline]
 unregister_netdevice_queue net/core/dev.c:11036 [inline]
 unregister_netdevice include/linux/netdevice.h:3115 [inline]
 unregister_netdev+0x180/0x1f8 net/core/dev.c:11175
 bnep_session+0x23bc/0x257c net/bluetooth/bnep/core.c:525
 kthread+0x288/0x310 kernel/kthread.c:388
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
irq event stamp: 9402
hardirqs last  enabled at (9401): [<ffff80008af65274>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]
hardirqs last  enabled at (9401): [<ffff80008af65274>] _raw_spin_unlock_irq+0x30/0x80 kernel/locking/spinlock.c:202
hardirqs last disabled at (9402): [<ffff80008af65014>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (9402): [<ffff80008af65014>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162
softirqs last  enabled at (9230): [<ffff8000890615e4>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (9230): [<ffff8000890615e4>] netif_addr_unlock_bh include/linux/netdevice.h:4534 [inline]
softirqs last  enabled at (9230): [<ffff8000890615e4>] dev_mc_flush+0x1b4/0x1f8 net/core/dev_addr_lists.c:1036
softirqs last disabled at (9228): [<ffff800089061b1c>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ 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 PID: 8958 Comm: kbnepd bnep0 Tainted: G        W          6.9.0-rc4-syzkaller-g6a71d2909427 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 604010c5 (nZCv daIF +PAN -UAO -TCO -DIT +SSBS BTYPE=--)
pc : check_wait_context kernel/locking/lockdep.c:4773 [inline]
pc : __lock_acquire+0x568/0x763c kernel/locking/lockdep.c:5087
lr : hlock_class kernel/locking/lockdep.c:232 [inline]
lr : check_wait_context kernel/locking/lockdep.c:4773 [inline]
lr : __lock_acquire+0x780/0x763c kernel/locking/lockdep.c:5087
sp : ffff8000987272c0
x29: ffff800098727580 x28: ffff0000cc9bbc80 x27: ffff0000cc9bc788
x26: 1fffe000199378f1 x25: ffff0000cc9bc6f0 x24: 0000000000000001
x23: 0000000000000003 x22: 0000000000001df5 x21: ffff8000924bc7b8
x20: 0000000000000000 x19: 00000000000000c4 x18: 0000000000000008
x17: 0000000000000000 x16: ffff80008ae725bc x15: 0000000000000001
x14: 1fffe000367b9602 x13: 0000000000000000 x12: dfff800000000000
x11: 0000000000000003 x10: 0000000000ff0100 x9 : 8484f82778db8800
x8 : 0000000000000018 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800098726a38 x4 : ffff80008ef650a0 x3 : ffff8000805e616c
x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000
Call trace:
 check_wait_context kernel/locking/lockdep.c:4773 [inline]
 __lock_acquire+0x568/0x763c kernel/locking/lockdep.c:5087
 lock_acquire+0x248/0x73c kernel/locking/lockdep.c:5754
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
 klist_next+0x8c/0x2e4 lib/klist.c:382
 next_device drivers/base/core.c:3970 [inline]
 device_for_each_child+0xc0/0x174 drivers/base/core.c:4048
 pm_runtime_set_memalloc_noio+0xf0/0x210 drivers/base/power/runtime.c:248
 netdev_unregister_kobject+0x148/0x208 net/core/net-sysfs.c:2106
 unregister_netdevice_many_notify+0x117c/0x1770 net/core/dev.c:11129
 unregister_netdevice_many net/core/dev.c:11157 [inline]
 unregister_netdevice_queue net/core/dev.c:11036 [inline]
 unregister_netdevice include/linux/netdevice.h:3115 [inline]
 unregister_netdev+0x180/0x1f8 net/core/dev.c:11175
 bnep_session+0x23bc/0x257c net/bluetooth/bnep/core.c:525
 kthread+0x288/0x310 kernel/kthread.c:388
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
Code: 34000ee8 aa1f03e8 91031113 d343fe68 (38ec6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	34000ee8 	cbz	w8, 0x1dc
   4:	aa1f03e8 	mov	x8, xzr
   8:	91031113 	add	x19, x8, #0xc4
   c:	d343fe68 	lsr	x8, x19, #3
* 10:	38ec6908 	ldrsb	w8, [x8, x12] <-- trapping instruction


---
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