WARNING in batadv_tvlv_container_remove

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 12ae58ca Linux 4.4.178
git tree: linux-4.4.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1150acd3200000
kernel config: https://syzkaller.appspot.com/x/.config?x=5ef6f190eb5ce732
dashboard link: https://syzkaller.appspot.com/bug?extid=11af97b48ac8173ff274
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+11af97...@syzkaller.appspotmail.com

kobject: 'batman_adv' (ffff88012a5c7c00): auto cleanup kobject_del
kobject: 'batman_adv' (ffff88012a5c7c00): calling ktype release
kobject: (ffff88012a5c7c00): dynamic_kobj_release
kobject: 'batman_adv': free name
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5761 at net/batman-adv/main.c:750
batadv_tvlv_container_remove+0x7b/0x80 net/batman-adv/main.c:750()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 5761 Comm: syz-executor.2 Not tainted 4.4.178 #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
0000000000000082 ffff8800b0f43868 ffffffff818ace22 0000000000000000
ffffffff82e94988 ffffffff8300837b ffff8800b0f438e0 ffffffff812711ac
ffff880000000008 ffff8800b0f438f0 ffff8800b0f43890 ffffffff8127657d
Call Trace:
[<ffffffff818ace22>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff818ace22>] dump_stack+0xa1/0xdf lib/dump_stack.c:51
[<ffffffff812711ac>] panic+0xd2/0x237 kernel/panic.c:112
[<ffffffff81271337>] warn_slowpath_common kernel/panic.c:455 [inline]
[<ffffffff81271337>] warn_slowpath_common.cold+0x16/0x16 kernel/panic.c:435
[<ffffffff811733a5>] warn_slowpath_null+0x15/0x20 kernel/panic.c:492
[<ffffffff825fda7b>] batadv_tvlv_container_remove+0x7b/0x80
net/batman-adv/main.c:750
[<ffffffff825fe883>] batadv_tvlv_container_register+0xb3/0x120
net/batman-adv/main.c:815
[<ffffffff825f7ca6>] batadv_dat_tvlv_container_update
net/batman-adv/distributed-arp-table.c:691 [inline]
[<ffffffff825f7ca6>] batadv_dat_tvlv_container_update+0x26/0x40
net/batman-adv/distributed-arp-table.c:680
[<ffffffff825f871a>] batadv_dat_init+0x6a/0x80
net/batman-adv/distributed-arp-table.c:763
[<ffffffff825fdf09>] batadv_mesh_init+0x239/0x290 net/batman-adv/main.c:173
[<ffffffff82609091>] batadv_softif_init_late+0x271/0x2c0
net/batman-adv/soft-interface.c:832
[<ffffffff820f5a7d>] register_netdevice+0xfd/0x450 net/core/dev.c:6756
[<ffffffff821055b3>] rtnl_newlink+0x8b3/0x910 net/core/rtnetlink.c:2393
[<ffffffff82103b26>] rtnetlink_rcv_msg+0x176/0x1e0
net/core/rtnetlink.c:3446
[<ffffffff82168a64>] netlink_rcv_skb+0x34/0xc0
net/netlink/af_netlink.c:2361
[<ffffffff821039a6>] rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:3452
[<ffffffff8216840b>] netlink_unicast_kernel net/netlink/af_netlink.c:1277
[inline]
[<ffffffff8216840b>] netlink_unicast+0x16b/0x2d0
net/netlink/af_netlink.c:1303
[<ffffffff82168761>] netlink_sendmsg+0x1f1/0x390
net/netlink/af_netlink.c:1859
[<ffffffff820d075b>] sock_sendmsg_nosec net/socket.c:600 [inline]
[<ffffffff820d075b>] sock_sendmsg+0x3b/0x50 net/socket.c:610
[<ffffffff820d0bed>] SYSC_sendto+0xed/0x160 net/socket.c:1640
[<ffffffff820d1a99>] SyS_sendto+0x9/0x10 net/socket.c:1608
[<ffffffff82668c02>] entry_SYSCALL_64_fastpath+0x22/0x82
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

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