------------[ cut here ]------------
WARNING: CPU: 1 PID: 23 at net/batman-adv/bat_iv_ogm.c:597 batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:597 [inline]
WARNING: CPU: 1 PID: 23 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:1857
(unnamed net_device) (uninitialized): up delay (511) is not a multiple of miimon (9), updelay rounded to 504 ms
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 23 Comm: kworker/u4:1 Not tainted 4.19.192-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
(unnamed net_device) (uninitialized): up delay (511) is not a multiple of miimon (9), updelay rounded to 504 ms
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
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:1857
Code: 3b bf ff e8 e3 af 4d f9 48 c7 c7 60 4f 6e 89 e8 b0 c9 dd ff e9 1f 3b bf ff e8 cd af 4d f9 48 c7 c7 60 4c 6e 89 e8 9a c9 dd ff <0f> 0b e9 07 3b bf ff e8 b5 af 4d f9 48 c7 c7 60 4c 6e 89 e8 82 c9
ip_tunnel: non-ECT from 0.0.0.0 with TOS=0x3
RSP: 0018:ffff8880b504fcc8 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff88809d6c2708 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814df6b1 RDI: ffffed1016a09f8b
RBP: ffff88809c060c80 R08: 0000000000000024 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a9d524c0
R13: ffff8880929a24c0 R14: ffff88809d6c26c0 R15: ffff88809c060c80
 process_one_work+0x864/0x1570 kernel/workqueue.c:2152
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2295
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Kernel Offset: disabled
Rebooting in 86400 seconds..