Re: [syzbot] kernel panic: kernel stack overflow

[Dmitry Vyukov]

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


> 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:
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>
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