rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=da6/1/0x4000000000000000 softirq=8308/8309 fqs=5208 
	(t=10500 jiffies g=7017 q=847)
NMI backtrace for cpu 0
CPU: 0 PID: 7371 Comm: syz-executor.2 Not tainted 5.12.0-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:79 [inline]
 dump_stack+0x10c/0x14b lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x30/0x99 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x11f/0x170 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x232/0x360 kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:624 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:699 [inline]
 rcu_pending kernel/rcu/tree.c:3911 [inline]
 rcu_sched_clock_irq.cold+0x5b/0x66b kernel/rcu/tree.c:2649
 update_process_times+0x131/0x1a0 kernel/time/timer.c:1796
 tick_sched_handle+0x6f/0x130 kernel/time/tick-sched.c:226
 tick_sched_timer+0x132/0x210 kernel/time/tick-sched.c:1373
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x19e/0xb90 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x2ef/0x900 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x13e/0x520 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:lock_release+0x478/0x7e0 kernel/locking/lockdep.c:5520
Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 12 03 00 00 48 83 3d 75 de e2 07 00 0f 84 9c 02 00 00 fb 66 0f 1f 44 00 00 <48> b8 00 00 00 00 00 fc ff df 48 01 c5 48 c7 45 00 00 00 00 00 c7
RSP: 0018:ffffc90004226cd8 EFLAGS: 00000282
RAX: 1ffffffff126e830 RBX: 5f726c0c0ec9587f RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff87cb4900 RDI: ffffffff88132660
RBP: 1ffff92000844d9d R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 615f6e616d746162 R12: 0000000000000002
R13: ffff888118170dd8 R14: 0000000000000003 R15: ffff888118170440
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:174 [inline]
 _raw_spin_unlock_bh+0x12/0x30 kernel/locking/spinlock.c:207
 spin_unlock_bh include/linux/spinlock.h:399 [inline]
 batadv_tt_local_purge+0x22a/0x310 net/batman-adv/translation-table.c:1369
 batadv_tt_local_resize_to_mtu+0x78/0xe0 net/batman-adv/translation-table.c:3987
 batadv_hardif_activate_interface.part.0.cold+0x141/0x1b4 net/batman-adv/hard-interface.c:655
 batadv_hardif_activate_interface net/batman-adv/hard-interface.c:802 [inline]
 batadv_hardif_enable_interface+0x96b/0xa30 net/batman-adv/hard-interface.c:794
 batadv_softif_slave_add+0x7a/0xf0 net/batman-adv/soft-interface.c:858
 do_setlink+0x84b/0x2df0 net/core/rtnetlink.c:2724
 __rtnl_newlink+0xabb/0x1360 net/core/rtnetlink.c:3385
 rtnl_newlink+0x5a/0x90 net/core/rtnetlink.c:3500
 rtnetlink_rcv_msg+0x32f/0x860 net/core/rtnetlink.c:5562
 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2502
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xab/0xe0 net/socket.c:674
 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2350
 ___sys_sendmsg+0xd3/0x150 net/socket.c:2404
 __sys_sendmsg+0xb2/0x140 net/socket.c:2433
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x463ca9
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:00007f7604f62188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000463ca9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00000000004ae538 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf00
R13: 00007ffddb7fd60f R14: 00007f7604f62300 R15: 0000000000022000