Re: [syzbot] kernel panic: kernel stack overflow

From: Taehee Yoo
Date: Thu Oct 13 2022 - 11:00:55 EST

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Hi,

On 10/12/22 21:19, Eric Dumazet wrote:
> On Wed, Oct 12, 2022 at 12:53 AM Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote:
>>
>> On Wed, 12 Oct 2022 at 09:48, syzbot
>> <syzbot+60748c96cf5c6df8e581@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>>
>>> 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=14a03a2a880000
>>> kernel config: https://syzkaller.appspot.com/x/.config?x=aae2d21e7dd80684
>>> dashboard link: https://syzkaller.appspot.com/bug?extid=60748c96cf5c6df8e581
>>> 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/syzbot-assets/11078f50b80b/disk-bbed346d.raw.xz
>>> vmlinux: https://storage.googleapis.com/syzbot-assets/398e5f1e6c84/vmlinux-bbed346d.xz
>>>
>>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>>> Reported-by: syzbot+60748c96cf5c6df8e581@xxxxxxxxxxxxxxxxxxxxxxxxx
>>
>> +Jiri
>>
>> It looks like the issue is with the team device. It seems to call
>> itself infinitely.
>> team_device_event was mentioned in stack overflow bugs in the past:
>> https://groups.google.com/g/syzkaller-bugs/search?q=%22team_device_event%22
>>
>
>
> Taehee Yoo, can you take a look ?
>
> Patch series of yours was supposed to limit max nest level to 8
>
> https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=65921376425fc9c8b7ce647e1f7989f7cdf5dd70
>

I found a reproducer.

#test_team.sh
ip link add dummy0 type dummy
ip link set dummy0 up
for a1 in {0..1}
do
ip link add team$a1 type team
for a2 in {0..1}
do
ip link add team$a1$a2 master team$a1 type team
for a3 in {0..1}
do
ip link add team$a1$a2$a3 master team$a1$a2 type team
for a4 in {0..1}
do
ip link add team$a1$a2$a3$a4 master team$a1$a2$a3 type team
for a5 in {0..1}
do
ip link add team$a1$a2$a3$a4$a5 master team$a1$a2$a3$a4 type team
for a6 in {0..1}
do
ip link add team$a1$a2$a3$a4$a5$a6 master team$a1$a2$a3$a4$a5 type team
ip link add macvlan$a1$a2$a3$a4$a5$a6 link dummy0 master team$a1$a2$a3$a4$a5$a6 type macvlan
ip link set macvlan$a1$a2$a3$a4$a5$a6 up
ip link set team$a1$a2$a3$a4$a5$a6 up
done
ip link set team$a1$a2$a3$a4$a5 up
done
ip link set team$a1$a2$a3$a4 up
done
ip link set team$a1$a2$a3 up
done
ip link set team$a1$a2 up
done
ip link set team$a1 up
done

#test_ethtool.sh
for a1 in {0..1}
do
ethtool -K team$a1 lro $1
for a2 in {0..1}
do
ethtool -K team$a1$a2 lro $1
for a3 in {0..1}
do
ethtool -K team$a1$a2$a3 lro $1
for a4 in {0..1}
do
ethtool -K team$a1$a2$a3$a4 lro $1
for a5 in {0..1}
do
ethtool -K team$a1$a2$a3$a4$a5 lro $1
for a6 in {0..1}
do
ethtool -K team$a1$a2$a3$a4$a5$a6 lro $1
ethtool -K macvlan$a1$a2$a3$a4$a5$a6 lro $1
done
done
done
done
done
done

shell#1
bash test_team.sh
while :
do
bash test_ethtool.sh on
done
shell#2
while :
do
bash test_ethtool.sh off
done

We can see a very similar call trace with the above reproducer.
I think it is the same issue.
Could you please test it?

And, I found the fixed same issue too.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.0&id=dd912306ff008891c82cd9f63e8181e47a9cb2fb
https://groups.google.com/g/syzkaller-bugs/c/-5OV1OW-dS4/m/o2Oq6AYSAwAJ

>
>
>
>>
>>> x8 : 00000000000c008e x7 : ffff80000818cfc0 x6 : 0000000000000000
>>> x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
>>> x2 : 0000000000000008 x1 : ffff00013e520a60 x0 : ffff00013e520000
>>> Kernel panic - not syncing: kernel stack overflow
>>> CPU: 1 PID: 16874 Comm: syz-executor.3 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
>>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
>>> Call trace:
>>> dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156
>>> show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163
>>> __dump_stack lib/dump_stack.c:88 [inline]
>>> dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106
>>> dump_stack+0x1c/0x58 lib/dump_stack.c:113
>>> panic+0x218/0x50c kernel/panic.c:274
>>> nmi_panic+0xbc/0xf0 kernel/panic.c:169
>>> panic_bad_stack+0x134/0x154 arch/arm64/kernel/traps.c:906
>>> handle_bad_stack+0x34/0x48 arch/arm64/kernel/entry-common.c:848
>>> __bad_stack+0x78/0x7c arch/arm64/kernel/entry.S:549
>>> mark_lock+0x4/0x1b4 kernel/locking/lockdep.c:4593
>>> lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
>>> do_write_seqcount_begin_nested include/linux/seqlock.h:516 [inline]
>>> do_write_seqcount_begin include/linux/seqlock.h:541 [inline]
>>> psi_group_change+0x128/0x3d0 kernel/sched/psi.c:705
>>> psi_task_switch+0x9c/0x310 kernel/sched/psi.c:851
>>> psi_sched_switch kernel/sched/stats.h:194 [inline]
>>> __schedule+0x554/0x5a0 kernel/sched/core.c:6489
>>> preempt_schedule_irq+0x64/0x110 kernel/sched/core.c:6806
>>> arm64_preempt_schedule_irq arch/arm64/kernel/entry-common.c:265 [inline]
>>> __el1_irq arch/arm64/kernel/entry-common.c:473 [inline]
>>> el1_interrupt+0x4c/0x68 arch/arm64/kernel/entry-common.c:485
>>> el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:490
>>> el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:577
>>> arch_local_irq_restore+0x8/0x10 arch/arm64/include/asm/irqflags.h:122
>>> lock_is_held include/linux/lockdep.h:283 [inline]
>>> __might_resched+0x7c/0x218 kernel/sched/core.c:9854
>>> __might_sleep+0x48/0x78 kernel/sched/core.c:9821
>>> might_alloc include/linux/sched/mm.h:274 [inline]
>>> slab_pre_alloc_hook mm/slab.h:700 [inline]
>>> slab_alloc_node mm/slub.c:3162 [inline]
>>> kmem_cache_alloc_node+0x80/0x370 mm/slub.c:3298
>>> __alloc_skb+0xf8/0x378 net/core/skbuff.c:422
>>> alloc_skb include/linux/skbuff.h:1257 [inline]
>>> nlmsg_new include/net/netlink.h:953 [inline]
>>> genlmsg_new include/net/genetlink.h:410 [inline]
>>> ethnl_default_notify+0x16c/0x320 net/ethtool/netlink.c:640
>>> ethtool_notify+0xb4/0x178 net/ethtool/netlink.c:704
>>> ethnl_notify_features net/ethtool/netlink.c:715 [inline]
>>> ethnl_netdev_event+0x44/0x60 net/ethtool/netlink.c:723
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_compute_features drivers/net/team/team.c:1031 [inline]
>>> team_device_event+0x1a8/0x25c drivers/net/team/team.c:3024
>>> 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_features_change net/core/dev.c:1315 [inline]
>>> netdev_sync_lower_features+0x13c/0x21c net/core/dev.c:9599
>>> __netdev_update_features+0x284/0xa88 net/core/dev.c:9751
>>> netdev_change_features+0x30/0xfc net/core/dev.c:9823
>>> team_add_slave+0x7c/0x98 drivers/net/team/team.c:1988
>>> do_set_master net/core/rtnetlink.c:2577 [inline]
>>> do_setlink+0x5f8/0x17a4 net/core/rtnetlink.c:2787
>>> __rtnl_newlink net/core/rtnetlink.c:3546 [inline]
>>> rtnl_newlink+0x988/0xa04 net/core/rtnetlink.c:3593
>>> rtnetlink_rcv_msg+0x484/0x82c net/core/rtnetlink.c:6090
>>> netlink_rcv_skb+0xe4/0x1d0 net/netlink/af_netlink.c:2501
>>> rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6108
>>> netlink_unicast_kernel+0xfc/0x1dc net/netlink/af_netlink.c:1319
>>> netlink_unicast+0x164/0x248 net/netlink/af_netlink.c:1345
>>> netlink_sendmsg+0x484/0x584 net/netlink/af_netlink.c:1921
>>> sock_sendmsg_nosec net/socket.c:714 [inline]
>>> sock_sendmsg net/socket.c:734 [inline]
>>> ____sys_sendmsg+0x2f8/0x440 net/socket.c:2482
>>> ___sys_sendmsg net/socket.c:2536 [inline]
>>> __sys_sendmsg+0x1ac/0x228 net/socket.c:2565
>>> __do_sys_sendmsg net/socket.c:2574 [inline]
>>> __se_sys_sendmsg net/socket.c:2572 [inline]
>>> __arm64_sys_sendmsg+0x2c/0x3c net/socket.c:2572
>>> __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:636
>>> el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
>>> el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
>>> SMP: stopping secondary CPUs
>>> Kernel Offset: disabled
>>> CPU features: 0x00000,02070084,26017203
>>> Memory Limit: none
>>>
>>>
>>> ---
>>> 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@xxxxxxxxxxxxxxxx.
>>>
>>> syzbot will keep track of this issue. See:
>>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>>>
>>> --
>>> You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
>>> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx.
>>> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000c8900705ead19e41%40google.com.

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