rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10495 ticks this GP) idle=b4e/1/0x4000000000000000 softirq=8388/8388 fqs=0 
	(t=10502 jiffies g=3361 q=62)
rcu: rcu_preempt kthread starved for 10503 jiffies! g3361 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:14648 pid:   10 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3779 [inline]
 __schedule+0x404/0x890 kernel/sched/core.c:4528
 schedule+0x38/0xe0 kernel/sched/core.c:4606
 schedule_timeout+0x1be/0x2e0 kernel/time/timer.c:1871
 rcu_gp_fqs_loop kernel/rcu/tree.c:1925 [inline]
 rcu_gp_kthread+0x707/0xc60 kernel/rcu/tree.c:2099
 kthread+0x145/0x170 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
NMI backtrace for cpu 1
CPU: 1 PID: 7408 Comm: syz-executor.2 Not tainted 5.10.0-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:77 [inline]
 dump_stack+0xa3/0xc8 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold.8+0x53/0x6d lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0xd5/0xf0 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:331
 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:637 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq.cold.95+0x61/0x5d5 kernel/rcu/tree.c:2567
 update_process_times+0x50/0x80 kernel/time/timer.c:1709
 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:1519 [inline]
 __hrtimer_run_queues+0x1e3/0x4f0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0xf9/0x210 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x8e/0x290 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+0xcc/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:653 [inline]
RIP: 0010:lock_acquire+0x133/0x420 kernel/locking/lockdep.c:5440
Code: b8 ff ff ff ff 65 0f c1 05 ea 41 de 7e 83 f8 01 0f 85 e0 01 00 00 48 83 3d e1 74 09 03 00 0f 84 f0 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 8b 44 24 30 65 48 33 04 25 28 00 00 00 0f 85 ca
RSP: 0018:ffffc90002183468 EFLAGS: 00000282
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000077f2d4e8
RDX: 3f5b0b86e0ce3d7b RSI: ffffffff83e8a497 RDI: 0000000000000282
RBP: 0000000000000000 R08: 00000000000032f4 R09: 0000000000000000
R10: 0000000000000001 R11: ffffc90002183360 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888112231198 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_pending_clients+0x58/0x100 net/batman-adv/translation-table.c:3895
 batadv_tt_local_resize_to_mtu+0x46/0x90 net/batman-adv/translation-table.c:4198
 batadv_update_min_mtu net/batman-adv/hard-interface.c:629 [inline]
 batadv_hardif_activate_interface.part.15.cold.26+0x2f/0x78 net/batman-adv/hard-interface.c:656
 batadv_hardif_activate_interface include/linux/refcount.h:199 [inline]
 batadv_hardif_enable_interface+0x27e/0x2c0 net/batman-adv/hard-interface.c:795
 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:5562
 netlink_rcv_skb+0x49/0xf0 net/netlink/af_netlink.c:2494
 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:00007f200f17ac78 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: 00007fffaadd745f R14: 00007f200f17b9c0 R15: 000000000078bf0c