kernel BUG at net/core/dev.c:LINE!

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 8e2406c8 Linux 4.19.117
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1237106be00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d55e962a4f87405a
dashboard link: https://syzkaller.appspot.com/bug?extid=5ad822035b1e50eb2ee7
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+5ad822...@syzkaller.appspotmail.com

mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
bond2 (unregistering): Releasing backup interface gtp0
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
bond2 (unregistering): Destroying bond bond2
------------[ cut here ]------------
kernel BUG at net/core/dev.c:8154!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 4.19.117-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:rollback_registered_many+0x1df/0xc40 net/core/dev.c:8154
Code: c0 0f 85 fe 08 00 00 c6 83 69 05 00 00 01 44 89 fe bf 01 00 00 00 e8 a0 a0 c8 fb 41 80 ff 01 0f 84 49 ff ff ff e8 61 9f c8 fb <0f> 0b e8 5a 9f c8 fb 48 8b 45 00 48 8d 58 90 48 39 c5 48 8d 44 24
RSP: 0018:ffff8880a9edf780 EFLAGS: 00010293
RAX: ffff8880a9ec61c0 RBX: ffff888032534780 RCX: ffffffff859f0a30
RDX: 0000000000000000 RSI: ffffffff859f0a3f RDI: 0000000000000001
RBP: ffff8880a9edf8b0 R08: ffff8880a9ec61c0 R09: fffffbfff13004bd
R10: fffffbfff13004bc R11: ffffffff898025e7 R12: ffff8880325347f0
R13: ffff8880a9edf840 R14: dffffc0000000000 R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff0352ac30 CR3: 000000008b526000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rollback_registered+0xf2/0x1c0 net/core/dev.c:8225
unregister_netdevice_queue net/core/dev.c:9278 [inline]
unregister_netdevice_queue+0x1d7/0x2b0 net/core/dev.c:9271
unregister_netdevice include/linux/netdevice.h:2614 [inline]
bond_release_and_destroy drivers/net/bonding/bond_main.c:2037 [inline]
bond_slave_netdev_event drivers/net/bonding/bond_main.c:3111 [inline]
bond_netdev_event+0x810/0xb00 drivers/net/bonding/bond_main.c:3225
notifier_call_chain+0xc0/0x230 kernel/notifier.c:93
call_netdevice_notifiers net/core/dev.c:1766 [inline]
rollback_registered_many+0x7bc/0xc40 net/core/dev.c:8183
unregister_netdevice_many.part.0+0x16/0x1e0 net/core/dev.c:9297
unregister_netdevice_many net/core/dev.c:9296 [inline]
default_device_exit_batch+0x2ff/0x3c0 net/core/dev.c:9768
ops_exit_list.isra.0+0xef/0x140 net/core/net_namespace.c:156
cleanup_net+0x3bf/0x850 net/core/net_namespace.c:553
process_one_work+0x91f/0x1640 kernel/workqueue.c:2155
worker_thread+0x96/0xe20 kernel/workqueue.c:2298
kthread+0x34a/0x420 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace 2d75dd6d104f7441 ]---
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
RIP: 0010:rollback_registered_many+0x1df/0xc40 net/core/dev.c:8154
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
Code: c0 0f 85 fe 08 00 00 c6 83 69 05 00 00 01 44 89 fe bf 01 00 00 00 e8 a0 a0 c8 fb 41 80 ff 01 0f 84 49 ff ff ff e8 61 9f c8 fb <0f> 0b e8 5a 9f c8 fb 48 8b 45 00 48 8d 58 90 48 39 c5 48 8d 44 24
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
set_target_v3_checkentry: 15 callbacks suppressed
Cannot find del_set index 0 as target
RSP: 0018:ffff8880a9edf780 EFLAGS: 00010293
Cannot find del_set index 0 as target
RAX: ffff8880a9ec61c0 RBX: ffff888032534780 RCX: ffffffff859f0a30
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
RDX: 0000000000000000 RSI: ffffffff859f0a3f RDI: 0000000000000001
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
RBP: ffff8880a9edf8b0 R08: ffff8880a9ec61c0 R09: fffffbfff13004bd
R10: fffffbfff13004bc R11: ffffffff898025e7 R12: ffff8880325347f0
Cannot find del_set index 0 as target
R13: ffff8880a9edf840 R14: dffffc0000000000 R15: 0000000000000002
Cannot find del_set index 0 as target
FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
Cannot find del_set index 0 as target
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
CR2: 0000000000761ff8 CR3: 000000020f820000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Cannot find del_set index 0 as target
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium
mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.