rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=d5b/1/0x4000000000000000 softirq=77109/77110 fqs=5021 
	(t=10500 jiffies g=119497 q=153)
NMI backtrace for cpu 1
CPU: 1 PID: 16610 Comm: syz-executor.4 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x5c/0x759 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_acquire+0x5b/0x510 kernel/locking/lockdep.c:5605
Code: 0c 24 48 c7 44 24 10 b3 8a b5 41 48 c1 eb 03 48 c7 44 24 18 9a cf 36 8b 48 01 d8 48 c7 44 24 20 b0 e2 5b 81 c7 00 f1 f1 f1 f1 <c7> 40 04 f1 f1 00 00 c7 40 08 00 00 00 f3 c7 40 0c f3 f3 f3 f3 65
RSP: 0018:ffffc90004166f08 EFLAGS: 00000282
RAX: fffff5200082cde3 RBX: 1ffff9200082cde3 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88806df05a98
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff88e2dba3 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88806df05a98 R15: 0000000000000000
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:354 [inline]
 batadv_tt_local_purge_pending_clients+0x112/0x4d0 net/batman-adv/translation-table.c:3655
 batadv_tt_local_resize_to_mtu+0x96/0x130 net/batman-adv/translation-table.c:3958
 batadv_hardif_activate_interface.part.0.cold+0x65/0x1ba net/batman-adv/hard-interface.c:651
 batadv_hardif_activate_interface net/batman-adv/hard-interface.c:742 [inline]
 batadv_hardif_enable_interface+0xa19/0xb20 net/batman-adv/hard-interface.c:734
 batadv_softif_slave_add+0x64/0x130 net/batman-adv/soft-interface.c:836
 do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2521
 __rtnl_newlink+0x13a1/0x1750 net/core/rtnetlink.c:3475
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3506
 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f855537de99
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8553cb1168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8555491100 RCX: 00007f855537de99
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000006
RBP: 00007f85553d7ff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7b6c4bbf R14: 00007f8553cb1300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	0c 24                	or     $0x24,%al
   2:	48 c7 44 24 10 b3 8a 	movq   $0x41b58ab3,0x10(%rsp)
   9:	b5 41
   b:	48 c1 eb 03          	shr    $0x3,%rbx
   f:	48 c7 44 24 18 9a cf 	movq   $0xffffffff8b36cf9a,0x18(%rsp)
  16:	36 8b
  18:	48 01 d8             	add    %rbx,%rax
  1b:	48 c7 44 24 20 b0 e2 	movq   $0xffffffff815be2b0,0x20(%rsp)
  22:	5b 81
  24:	c7 00 f1 f1 f1 f1    	movl   $0xf1f1f1f1,(%rax)
* 2a:	c7 40 04 f1 f1 00 00 	movl   $0xf1f1,0x4(%rax) <-- trapping instruction
  31:	c7 40 08 00 00 00 f3 	movl   $0xf3000000,0x8(%rax)
  38:	c7 40 0c f3 f3 f3 f3 	movl   $0xf3f3f3f3,0xc(%rax)
  3f:	65                   	gs