rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=d12/1/0x4000000000000002 softirq=61644/61645 fqs=5248 
	(t=10502 jiffies g=112509 q=2038)
NMI backtrace for cpu 0
CPU: 0 PID: 2330 Comm: syz-executor.2 Not tainted 5.6.0-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+0x188/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x19b/0x1e5 kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:549 [inline]
 rcu_pending kernel/rcu/tree.c:3225 [inline]
 rcu_sched_clock_irq.cold+0x55d/0xcfa kernel/rcu/tree.c:2296
 update_process_times+0x25/0x60 kernel/time/timer.c:1727
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1320
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x5ca/0xed0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:lock_acquire+0x27b/0x8f0 kernel/locking/lockdep.c:4895
Code: 00 00 48 83 3d 35 0e 3b 08 00 0f 84 65 04 00 00 48 8b 3c 24 57 9d 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 08 <48> c7 00 00 00 00 00 48 c7 40 08 00 00 00 00 48 8b 84 24 b8 00 00
RSP: 0018:ffffc90016da7700 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: fffff52002db4ee4 RBX: ffff88804f442600 RCX: 9a439eeb847e3d05
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8c2d8e27 R11: fffffbfff185b1c4 R12: 0000000000000000
R13: ffff888059f47d98 R14: 0000000000000000 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:358 [inline]
 batadv_tt_local_purge+0x104/0x360 net/batman-adv/translation-table.c:1444
 batadv_tt_local_resize_to_mtu+0x8e/0x130 net/batman-adv/translation-table.c:4197
 batadv_update_min_mtu net/batman-adv/hard-interface.c:626 [inline]
 batadv_hard_if_event+0x430/0x1690 net/batman-adv/hard-interface.c:1056
 notifier_call_chain+0xc0/0x230 kernel/notifier.c:83
 call_netdevice_notifiers_info net/core/dev.c:1948 [inline]
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1933
 call_netdevice_notifiers_mtu net/core/dev.c:1997 [inline]
 dev_set_mtu_ext+0x39f/0x5f0 net/core/dev.c:8285
 dev_set_mtu+0x95/0x120 net/core/dev.c:8306
 dev_ifsioc+0x338/0x970 net/core/dev_ioctl.c:251
 dev_ioctl+0x1b1/0xc60 net/core/dev_ioctl.c:496
 sock_do_ioctl+0x1b7/0x2f0 net/socket.c:1076
 sock_ioctl+0x3ec/0x790 net/socket.c:1204
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45c879
Code: ad 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f848b1fdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f848b1fe6d4 RCX: 000000000045c879
RDX: 0000000020000180 RSI: 0000000000008922 RDI: 0000000000000003
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004a5 R14: 00000000004c76b3 R15: 000000000076bf0c