rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10490 ticks this GP) idle=0a6/1/0x4000000000000000 softirq=9503/9505 fqs=5234 
	(t=10500 jiffies g=3521 q=747)
NMI backtrace for cpu 0
CPU: 0 PID: 8201 Comm: syz-executor.2 Not tainted 5.9.0-rc8-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:77 [inline]
 dump_stack+0xa3/0xcc lib/dump_stack.c:118
 nmi_cpu_backtrace.cold.8+0x3e/0x58 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0xd5/0xec lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0xa2/0xce kernel/rcu/tree_stall.h:318
 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 rcu_pending kernel/rcu/tree.c:3639 [inline]
 rcu_sched_clock_irq.cold.94+0x61/0x52d kernel/rcu/tree.c:2521
 update_process_times+0x1f/0x60 kernel/time/timer.c:1710
 tick_sched_handle.isra.24+0x1a/0x50 kernel/time/tick-sched.c:176
 tick_sched_timer+0x6c/0x80 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x1e1/0x510 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0xf9/0x210 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x8e/0x2b0 arch/x86/kernel/apic/apic.c:1097
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0xc1/0xe0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline]
RIP: 0010:lock_acquire+0x10e/0x400 kernel/locking/lockdep.c:5032
Code: 08 00 00 83 e8 01 66 85 c0 41 89 82 e4 08 00 00 0f 85 63 02 00 00 48 83 3d 06 3f 09 03 00 0f 84 67 02 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 8b 44 24 38 65 48 33 04 25 28 00 00 00 0f 85 ce
RSP: 0018:ffffc90002a77470 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 00000000e9f32009
RDX: 6723454710d586f0 RSI: 0000000000000002 RDI: 0000000000000286
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffff88810ff4a280 R11: 6723454710d586f0 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88811149bb58 R15: 0000000000000000
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 batadv_tt_local_purge+0x46/0xe0 net/batman-adv/translation-table.c:1444
 batadv_tt_local_resize_to_mtu+0x3e/0x90 net/batman-adv/translation-table.c:4197
 batadv_update_min_mtu net/batman-adv/hard-interface.c:626 [inline]
 batadv_hardif_activate_interface.part.15.cold.25+0x2f/0x77 net/batman-adv/hard-interface.c:653
 batadv_hardif_activate_interface include/linux/refcount.h:204 [inline]
 batadv_hardif_enable_interface+0x27e/0x2c0 net/batman-adv/hard-interface.c:792
 batadv_softif_slave_add+0x3c/0x90 net/batman-adv/soft-interface.c:891
 do_setlink+0x321/0x10b0 net/core/rtnetlink.c:2713
 __rtnl_newlink+0x538/0x8a0 net/core/rtnetlink.c:3374
 rtnl_newlink+0x3e/0x60 net/core/rtnetlink.c:3500
 rtnetlink_rcv_msg+0x173/0x480 net/core/rtnetlink.c:5563
 netlink_rcv_skb+0x41/0x110 net/netlink/af_netlink.c:2470
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x19a/0x270 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x248/0x480 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0x2b/0x40 net/socket.c:671
 ____sys_sendmsg+0x1ed/0x230 net/socket.c:2353
 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407
 __sys_sendmsg+0x52/0xa0 net/socket.c:2440
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c369
Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5f95ad7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002b740 RCX: 000000000045c369
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffebebfc6bf R14: 00007f5f95ad89c0 R15: 000000000078bf0c