rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=312/1/0x4000000000000000 softirq=7941/7942 fqs=14 
	(t=10502 jiffies g=3357 q=33)
rcu: rcu_preempt kthread starved for 10475 jiffies! g3357 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:3778 [inline]
 __schedule+0x3f3/0x880 kernel/sched/core.c:4527
 schedule+0x37/0xe0 kernel/sched/core.c:4602
 schedule_timeout+0x1af/0x2d0 kernel/time/timer.c:1879
 rcu_gp_fqs_loop kernel/rcu/tree.c:1888 [inline]
 rcu_gp_kthread+0x707/0xc60 kernel/rcu/tree.c:2058
 kthread+0x148/0x170 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
NMI backtrace for cpu 0
CPU: 0 PID: 8202 Comm: syz-executor.1 Not tainted 5.9.0-rc2-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+0xb3/0xec 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:3637 [inline]
 rcu_sched_clock_irq.cold.94+0x61/0x52d kernel/rcu/tree.c:2519
 update_process_times+0x1f/0x60 kernel/time/timer.c:1710
 tick_sched_handle.isra.23+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_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [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:__raw_callee_save___pv_queued_spin_unlock+0xc/0x12
Code: 56 57 41 50 41 51 41 52 41 53 e8 7f 05 00 00 41 5b 41 5a 41 59 41 58 5f 5e 5a 59 c3 66 90 52 b8 01 00 00 00 31 d2 f0 0f b0 17 <3c> 01 75 02 5a c3 56 0f b6 f0 e8 c5 ff ff ff 5e 5a c3 66 90 41 54
RSP: 0018:ffffc90002abf4d0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88811930aa80 RCX: ffffc90002abf4b4
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88811930aa80
RBP: ffff888118f6f550 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: c1a1cf4f6c174c15 R12: 00000000ffffff20
R13: 00000000000002ab R14: ffff88811e4d9840 R15: ffff88810f0ad800
 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:661 [inline]
 queued_spin_unlock arch/x86/include/asm/qspinlock.h:56 [inline]
 do_raw_spin_unlock+0x4e/0xc0 kernel/locking/spinlock_debug.c:139
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:175 [inline]
 _raw_spin_unlock_bh+0x1a/0x30 kernel/locking/spinlock.c:207
 spin_unlock_bh include/linux/spinlock.h:399 [inline]
 batadv_tt_local_purge+0xba/0xe0 net/batman-adv/translation-table.c:1446
 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:892
 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:00007f63c9707c78 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: 00007ffd0072291f R14: 00007f63c97089c0 R15: 000000000078bf0c