[syzbot] WARNING: locking bug in tee_netdev_event

From: syzbot
Date: Sun Sep 18 2022 - 05:20:46 EST

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Hello,

syzbot found the following issue on:

HEAD commit: a6b443748715 Merge branch 'for-next/core', remote-tracking..
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=167bf2d5080000
kernel config: https://syzkaller.appspot.com/x/.config?x=14bf9ec0df433b27
dashboard link: https://syzkaller.appspot.com/bug?extid=68f4b631890adeb054ae
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

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

Downloadable assets:
disk image: https://storage.googleapis.com/81b491dd5861/disk-a6b44374.raw.xz
vmlinux: https://storage.googleapis.com/69c979cdc99a/vmlinux-a6b44374.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+68f4b631890adeb054ae@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 0 PID: 3067 at kernel/locking/lockdep.c:231 check_wait_context kernel/locking/lockdep.c:4727 [inline]
WARNING: CPU: 0 PID: 3067 at kernel/locking/lockdep.c:231 __lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003
Modules linked in:
CPU: 0 PID: 3067 Comm: syz-executor.0 Not tainted 6.0.0-rc4-syzkaller-17255-ga6b443748715 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : check_wait_context kernel/locking/lockdep.c:4727 [inline]
pc : __lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003
lr : hlock_class kernel/locking/lockdep.c:231 [inline]
lr : check_wait_context kernel/locking/lockdep.c:4727 [inline]
lr : __lock_acquire+0x298/0x30a4 kernel/locking/lockdep.c:5003
sp : ffff80001286b820
x29: ffff80001286b900 x28: 0000000000000001 x27: ffff0000cb301aa8
x26: ffff0000fe4b8178 x25: ffff0000cb3024d8 x24: 0000000000000000
x23: 0000000000000000 x22: 0000000000000001 x21: 0000000000000000
x20: 0000000000000000 x19: 555554aaabeb6ffe x18: 000000000000039a
x17: 0000000000000008 x16: ffff80000db78658 x15: ffff0000cb301a80
x14: 0000000000000000 x13: 0000000000000012 x12: ffff80000d61f8a0
x11: ff808000081c1fa0 x10: ffff80000dd3a698 x9 : 47cf821c4953b000
x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff8000081965e0
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000100000001 x0 : 0000000000000016
Call trace:
check_wait_context kernel/locking/lockdep.c:4727 [inline]
__lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003
lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
__mutex_lock_common+0xd4/0xca8 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
tee_netdev_event+0x54/0x1a8 net/netfilter/xt_TEE.c:68
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0x7c/0x108 kernel/notifier.c:455
call_netdevice_notifiers_info net/core/dev.c:1945 [inline]
call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]
call_netdevice_notifiers net/core/dev.c:1997 [inline]
netdev_wait_allrefs_any net/core/dev.c:10250 [inline]
netdev_run_todo+0x340/0x6f0 net/core/dev.c:10364
rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147
tun_detach drivers/net/tun.c:704 [inline]
tun_chr_close+0xe8/0xfc drivers/net/tun.c:3455
__fput+0x198/0x3dc fs/file_table.c:320
____fput+0x20/0x30 fs/file_table.c:353
task_work_run+0xc4/0x14c kernel/task_work.c:177
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x26c/0xbe0 kernel/exit.c:795
do_group_exit+0x60/0xe8 kernel/exit.c:925
__do_sys_exit_group kernel/exit.c:936 [inline]
__se_sys_exit_group kernel/exit.c:934 [inline]
__wake_up_parent+0x0/0x40 kernel/exit.c:934
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642
el0t_64_sync+0x18c/0x190
irq event stamp: 6465499
hardirqs last enabled at (6465499): [<ffff8000081029e0>] __local_bh_enable_ip+0x13c/0x1a4 kernel/softirq.c:401
hardirqs last disabled at (6465497): [<ffff800008102968>] __local_bh_enable_ip+0xc4/0x1a4 kernel/softirq.c:378
softirqs last enabled at (6465498): [<ffff80000b598ccc>] spin_unlock_bh include/linux/spinlock.h:394 [inline]
softirqs last enabled at (6465498): [<ffff80000b598ccc>] rt_flush_dev+0x32c/0x374 net/ipv4/route.c:1557
softirqs last disabled at (6465496): [<ffff80000b598ab4>] spin_lock_bh include/linux/spinlock.h:354 [inline]
softirqs last disabled at (6465496): [<ffff80000b598ab4>] rt_flush_dev+0x114/0x374 net/ipv4/route.c:1548
---[ end trace 0000000000000000 ]---
Unable to handle kernel NULL pointer dereference at virtual address 00000000000000b8
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=0000000109391000
[00000000000000b8] pgd=0000000000000000, p4d=0000000000000000
Internal error: Oops: 96000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 3067 Comm: syz-executor.0 Tainted: G W 6.0.0-rc4-syzkaller-17255-ga6b443748715 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : check_wait_context kernel/locking/lockdep.c:4727 [inline]
pc : __lock_acquire+0x2d0/0x30a4 kernel/locking/lockdep.c:5003
lr : hlock_class kernel/locking/lockdep.c:231 [inline]
lr : check_wait_context kernel/locking/lockdep.c:4727 [inline]
lr : __lock_acquire+0x298/0x30a4 kernel/locking/lockdep.c:5003
sp : ffff80001286b820
x29: ffff80001286b900 x28: 0000000000000001 x27: ffff0000cb301aa8
x26: ffff0000fe4b8178 x25: ffff0000cb3024d8 x24: 0000000000000000
x23: 0000000000000000 x22: 0000000000000001 x21: 0000000000000000
x20: 0000000000000000 x19: 555554aaabeb6ffe x18: 000000000000039a
x17: 0000000000000008 x16: ffff80000db78658 x15: ffff0000cb301a80
x14: 0000000000000000 x13: 0000000000000012 x12: ffff80000d61f8a0
x11: ff808000081c1fa0 x10: ffff80000dd3a698 x9 : 0000000000040ffe
x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff8000081965e0
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:4728 [inline]
__lock_acquire+0x2d0/0x30a4 kernel/locking/lockdep.c:5003
lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
__mutex_lock_common+0xd4/0xca8 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
tee_netdev_event+0x54/0x1a8 net/netfilter/xt_TEE.c:68
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0x7c/0x108 kernel/notifier.c:455
call_netdevice_notifiers_info net/core/dev.c:1945 [inline]
call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]
call_netdevice_notifiers net/core/dev.c:1997 [inline]
netdev_wait_allrefs_any net/core/dev.c:10250 [inline]
netdev_run_todo+0x340/0x6f0 net/core/dev.c:10364
rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147
tun_detach drivers/net/tun.c:704 [inline]
tun_chr_close+0xe8/0xfc drivers/net/tun.c:3455
__fput+0x198/0x3dc fs/file_table.c:320
____fput+0x20/0x30 fs/file_table.c:353
task_work_run+0xc4/0x14c kernel/task_work.c:177
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x26c/0xbe0 kernel/exit.c:795
do_group_exit+0x60/0xe8 kernel/exit.c:925
__do_sys_exit_group kernel/exit.c:936 [inline]
__se_sys_exit_group kernel/exit.c:934 [inline]
__wake_up_parent+0x0/0x40 kernel/exit.c:934
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642
el0t_64_sync+0x18c/0x190
Code: f002dcea 91196210 911a614a b9400329 (3942e114)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: f002dcea adrp x10, 0x5b9f000
4: 91196210 add x16, x16, #0x658
8: 911a614a add x10, x10, #0x698
c: b9400329 ldr w9, [x25]
* 10: 3942e114 ldrb w20, [x8, #184] <-- trapping instruction

---
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Next message: Geert Uytterhoeven: "Re: [PATCH 1/2] arm64: dts: renesas: rzg2ul-smarc: Include SoM DTSI into board DTS"
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