rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4388/1:b..l
	(detected by 1, t=10503 jiffies, g=10565, q=1113 ncpus=2)
task:syz-executor    state:R  running task     stack:21616 pid:4388  ppid:4385   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6875
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:ether_addr_equal include/linux/etherdevice.h:349 [inline]
RIP: 0010:ether_addr_equal_unaligned include/linux/etherdevice.h:402 [inline]
RIP: 0010:batadv_compare_eth net/batman-adv/main.h:267 [inline]
RIP: 0010:batadv_check_known_mac_addr+0x1c0/0x3e0 net/batman-adv/hard-interface.c:521
Code: 8b 44 24 20 42 80 3c 28 00 74 08 4c 89 f7 e8 6f 40 db f7 49 8b 2e 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 fa 00 00 00 <44> 8b 33 48 89 e8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 00 01 00
RSP: 0018:ffffc90003ea6e18 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888027a1b928 RCX: 0000000000000000
RDX: ffff888029df0000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffff88805712cc28 R08: ffffc90003ea6aa7 R09: 1ffff920007d4d54
R10: dffffc0000000000 R11: fffff520007d4d55 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88807c328380 R15: ffff88802973d800
 batadv_hard_if_event+0x490/0x1510 net/batman-adv/hard-interface.c:992
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline]
 call_netdevice_notifiers net/core/dev.c:2066 [inline]
 dev_set_mac_address+0x2ed/0x400 net/core/dev.c:8937
 dev_set_mac_address_user+0x2d/0x50 net/core/dev.c:8951
 do_setlink+0x7eb/0x29c0 net/core/rtnetlink.c:2800
 __rtnl_newlink net/core/rtnetlink.c:3622 [inline]
 rtnl_newlink+0x16e4/0x1f90 net/core/rtnetlink.c:3669
 rtnetlink_rcv_msg+0x863/0xfb0 net/core/rtnetlink.c:6166
 netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 __sys_sendto+0x497/0x650 net/socket.c:2153
 __do_sys_sendto net/socket.c:2165 [inline]
 __se_sys_sendto net/socket.c:2161 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2161
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f03f3b5e84e
RSP: 002b:00007ffcb4a0f608 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000555578480500 RCX: 00007f03f3b5e84e
RDX: 000000000000002c RSI: 00007f03f4954670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffcb4a0f684 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f03f4954670 R15: 0000000000000000
 </TASK>