rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4747
------------[ cut here ]------------
WARNING: CPU: 0 PID: 35 at net/batman-adv/bat_iv_ogm.c:597 batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:597 [inline]
WARNING: CPU: 0 PID: 35 at net/batman-adv/bat_iv_ogm.c:597 batadv_iv_send_outstanding_bat_ogm_packet.cold+0x3f/0x46 net/batman-adv/bat_iv_ogm.c:1853
 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454
Kernel panic - not syncing: panic_on_warn set ...

 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4765
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x537/0x720 net/netlink/af_netlink.c:1343
 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:632
 ___sys_sendmsg+0x803/0x920 net/socket.c:2115
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153
 __do_sys_sendmsg net/socket.c:2162 [inline]
 __se_sys_sendmsg net/socket.c:2160 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a639
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4b60201c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f4b60201c90 RCX: 000000000045a639
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4b602026d4
R13: 00000000004c8d75 R14: 00000000004df5e0 R15: 0000000000000006
CPU: 0 PID: 35 Comm: kworker/u4:2 Not tainted 4.19.86-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
batman_adv: batadv0: Adding interface: veth139
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
kobject: 'iosched' (00000000dfedb14a): kobject_cleanup, parent           (null)
batman_adv: batadv0: The MTU of interface veth139 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem.
 __warn.cold+0x20/0x53 kernel/panic.c:541
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296
batman_adv: batadv0: Not using interface veth139 (retrying later): interface not active
kobject: 'iosched' (00000000dfedb14a): calling ktype release
kobject: 'iosched': free name
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037
kobject: 'loop0' (00000000e9142d81): kobject_cleanup, parent           (null)
RIP: 0010:batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:597 [inline]
RIP: 0010:batadv_iv_send_outstanding_bat_ogm_packet.cold+0x3f/0x46 net/batman-adv/bat_iv_ogm.c:1853
Code: a4 ff ff e8 83 29 97 fa 48 c7 c7 00 55 fb 87 e8 8b 8d 81 fa e9 7d a4 ff ff e8 6d 29 97 fa 48 c7 c7 c0 51 fb 87 e8 75 8d 81 fa <0f> 0b e9 65 a4 ff ff e8 55 29 97 fa 48 c7 c7 c0 51 fb 87 e8 5d 8d
RSP: 0018:ffff8880a989fcc8 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff88808c0a8388 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815595f6 RDI: ffffed1015313f8b
RBP: ffff8880a989fd30 R08: 0000000000000024 R09: ffffed1015d05079
kobject: 'loop0' (00000000e9142d81): calling ktype release
R10: ffffed1015d05078 R11: ffff8880ae8283c7 R12: ffff8880856b4a40
R13: ffff8880869e8dc0 R14: ffff88808c0a8340 R15: ffff8880856b4a40
 process_one_work+0x989/0x1750 kernel/workqueue.c:2153
kobject: 'queue' (00000000fa2655ee): kobject_cleanup, parent           (null)
kobject: 'queue' (00000000fa2655ee): calling ktype release
 worker_thread+0x98/0xe40 kernel/workqueue.c:2296
 kthread+0x354/0x420 kernel/kthread.c:246
kobject: 'queue': free name
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
kobject: '0' (000000007d3cbfc9): kobject_cleanup, parent           (null)
Kernel Offset: disabled
Rebooting in 86400 seconds..