bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_1 entered promiscuous mode
------------[ cut here ]------------
Have pending ack frames!
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
WARNING: CPU: 1 PID: 17250 at net/mac80211/main.c:1265 ieee80211_free_ack_frame+0x65/0x70 net/mac80211/main.c:1265
bond0: Enslaving bond_slave_0 as an active interface with an up link
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 17250 Comm: kworker/u4:7 Not tainted 4.19.150-syzkaller #0
bond0: Enslaving bond_slave_1 as an active interface with an up link
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 panic+0x2ac/0x565 kernel/panic.c:186
IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready
team0: Port device team_slave_0 added
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 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+0x1e1/0x330 arch/x86/kernel/traps.c:296
IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready
team0: Port device team_slave_1 added
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:ieee80211_free_ack_frame+0x65/0x70 net/mac80211/main.c:1265
Code: e8 b0 a2 26 fa 48 89 ef e8 38 73 c9 fe 31 c0 5b 5d c3 e8 9e a2 26 fa 48 c7 c7 00 50 cd 88 c6 05 21 d9 e8 03 01 e8 c1 4e f7 f9 <0f> 0b eb d2 0f 1f 80 00 00 00 00 41 57 41 56 41 55 41 54 49 bc 00
batman_adv: batadv0: Adding interface: batadv_slave_0
RSP: 0018:ffff888081b9fa30 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815b623f RDI: ffffed1010373f38
RBP: ffff8880938ede80 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffffff874b2f70 R14: 0000000000000000 R15: ffff88804a1d32f0
 idr_for_each+0x132/0x2d0 lib/idr.c:211
batman_adv: batadv0: The MTU of interface batadv_slave_0 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.
batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
batman_adv: batadv0: Adding interface: batadv_slave_1
batman_adv: batadv0: The MTU of interface batadv_slave_1 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.
 ieee80211_free_hw+0xa6/0x150 net/mac80211/main.c:1280
batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
 mac80211_hwsim_del_radio drivers/net/wireless/mac80211_hwsim.c:2998 [inline]
 hwsim_exit_net+0xd2e/0x1730 drivers/net/wireless/mac80211_hwsim.c:3666
IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready
 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153
 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:553
 process_one_work+0x796/0x14e0 kernel/workqueue.c:2155
IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
 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..