syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.3:11175]
Modules linked in:
irq event stamp: 20298323
hardirqs last  enabled at (20298322): [<ffff8000081b5d1c>] __local_bh_enable_ip+0x230/0x470 kernel/softirq.c:388
hardirqs last disabled at (20298323): [<ffff80001197b990>] enter_el1_irq_or_nmi+0x10/0x1c arch/arm64/kernel/entry-common.c:227
softirqs last  enabled at (4046): [<ffff80000fdf9770>] pneigh_ifdown_and_unlock net/core/neighbour.c:807 [inline]
softirqs last  enabled at (4046): [<ffff80000fdf9770>] __neigh_ifdown+0x198/0x370 net/core/neighbour.c:392
softirqs last disabled at (4070): [<ffff8000117cd6b4>] spin_lock_bh include/linux/spinlock.h:368 [inline]
softirqs last disabled at (4070): [<ffff8000117cd6b4>] batadv_tt_local_resize_to_mtu+0x60/0x150 net/batman-adv/translation-table.c:3949
CPU: 0 PID: 11175 Comm: syz-executor.3 Not tainted 5.15.153-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : should_resched arch/arm64/include/asm/preempt.h:78 [inline]
pc : __local_bh_enable_ip+0x238/0x470 kernel/softirq.c:390
lr : __local_bh_enable_ip+0x230/0x470 kernel/softirq.c:388
sp : ffff8000201a6330
x29: ffff8000201a6340 x28: 0000000000000100 x27: ffff0000e64c0818
x26: ffff0000cb885a90 x25: ffff0000e67fc708 x24: 0000000000000001
x23: 1fffe00019671369 x22: dfff800000000000 x21: ffff8000117cda08
x20: 0000000000000202 x19: ffff0000cb389b48 x18: 0000000000000202
x17: 0000000000000002 x16: ffff8000082eb194 x15: 00000000ffffffff
x14: 1ffff0000292206a x13: dfff800000000000 x12: 0000000000040000
x11: 000000000003ffff x10: 0000000000000003 x9 : 0000000000000000
x8 : 00000000000000e0 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800008046860
x2 : 0000000000000002 x1 : ffff800011acad00 x0 : ffff80019ff93000
Call trace:
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:35 [inline]
 __local_bh_enable_ip+0x238/0x470 kernel/softirq.c:388
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline]
 _raw_spin_unlock_bh+0xf8/0x180 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:408 [inline]
 batadv_tt_local_purge+0x264/0x2e8 net/batman-adv/translation-table.c:1356
 batadv_tt_local_resize_to_mtu+0x9c/0x150 net/batman-adv/translation-table.c:3956
 batadv_hard_if_event+0x41c/0xe10
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:391
 call_netdevice_notifiers_info net/core/dev.c:2018 [inline]
 call_netdevice_notifiers_mtu+0x16c/0x208 net/core/dev.c:2067
 dev_set_mtu_ext+0x3c4/0x540 net/core/dev.c:8955
 do_setlink+0x7d8/0x3164 net/core/rtnetlink.c:2704
 __rtnl_newlink net/core/rtnetlink.c:3429 [inline]
 rtnl_newlink+0x12fc/0x1af4 net/core/rtnetlink.c:3549
 rtnetlink_rcv_msg+0xa74/0xdac net/core/rtnetlink.c:5629
 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2505
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:5647
 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
 netlink_unicast+0x664/0x938 net/netlink/af_netlink.c:1356
 netlink_sendmsg+0x844/0xb38 net/netlink/af_netlink.c:1924
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x584/0x870 net/socket.c:2431
 ___sys_sendmsg+0x214/0x294 net/socket.c:2485
 __sys_sendmsg net/socket.c:2514 [inline]
 __do_sys_sendmsg net/socket.c:2523 [inline]
 __se_sys_sendmsg net/socket.c:2521 [inline]
 __arm64_sys_sendmsg+0x1ac/0x25c net/socket.c:2521
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584