rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10484 ticks this GP) idle=80a/1/0x4000000000000000 softirq=9851/9851 fqs=0 
	(t=10502 jiffies g=7073 q=954)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g7073 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=3457
rcu: rcu_preempt kthread starved for 10505 jiffies! g7073 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:29456 pid:   13 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4322 [inline]
 __schedule+0xf86/0x2180 kernel/sched/core.c:5073
 schedule+0xcf/0x270 kernel/sched/core.c:5152
 schedule_timeout+0x11d/0x210 kernel/time/timer.c:1892
 rcu_gp_fqs_loop kernel/rcu/tree.c:2005 [inline]
 rcu_gp_kthread+0xca5/0x20c0 kernel/rcu/tree.c:2178
 kthread+0x36f/0x450 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 7354 Comm: syz-executor.1 Not tainted 5.12.0-rc5-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_check_gp_kthread_starvation+0x192/0x1af kernel/rcu/tree_stall.h:478
 print_cpu_stall kernel/rcu/tree_stall.h:620 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:697 [inline]
 rcu_pending kernel/rcu/tree.c:3830 [inline]
 rcu_sched_clock_irq.cold+0x601/0x10b4 kernel/rcu/tree.c:2650
 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:1369
 __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:arch_local_irq_enable arch/x86/include/asm/paravirt.h:659 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:145 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5513 [inline]
RIP: 0010:lock_acquire+0x639/0x850 kernel/locking/lockdep.c:5475
Code: 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 80 01 00 00 48 83 3d 90 31 e3 07 00 74 5b fb 66 0f 1f 44 00 00 <e9> 06 fc ff ff 0f 0b e9 53 fa ff ff 0f 0b 0f 0b 0f 0b e9 e0 fe ff
RSP: 0018:ffffc900048d6cd8 EFLAGS: 00000282
RAX: 1ffffffff126dec0 RBX: 1ffff9200091ad9d RCX: 1ffff9200091ad84
RDX: dffffc0000000000 RSI: ffffffff87cb2d00 RDI: ffffffff88129500
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8bfaac97
R10: fffffbfff17f5592 R11: 615f6e616d746162 R12: 0000000000000000
R13: ffff88812120ddd8 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:359 [inline]
 batadv_tt_local_purge_pending_clients+0xf2/0x3b0 net/batman-adv/translation-table.c:3683
 batadv_tt_local_resize_to_mtu+0x80/0xe0 net/batman-adv/translation-table.c:3986
 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+0x7f1/0x2f10 net/core/rtnetlink.c:2715
 __rtnl_newlink+0xabb/0x1360 net/core/rtnetlink.c:3376
 rtnl_newlink+0x5a/0x90 net/core/rtnetlink.c:3491
 rtnetlink_rcv_msg+0x32f/0x860 net/core/rtnetlink.c:5553
 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+0x2d/0x70 arch/x86/entry/common.c:46
 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:00007fb4780ff188 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: 00007fff046dcb3f R14: 00007fb4780ff300 R15: 0000000000022000
NMI backtrace for cpu 1
CPU: 1 PID: 7354 Comm: syz-executor.1 Not tainted 5.12.0-rc5-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+0x1c6/0x24a kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:622 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:697 [inline]
 rcu_pending kernel/rcu/tree.c:3830 [inline]
 rcu_sched_clock_irq.cold+0x606/0x10b4 kernel/rcu/tree.c:2650
 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:1369
 __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:arch_local_irq_enable arch/x86/include/asm/paravirt.h:659 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:145 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5513 [inline]
RIP: 0010:lock_acquire+0x639/0x850 kernel/locking/lockdep.c:5475
Code: 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 80 01 00 00 48 83 3d 90 31 e3 07 00 74 5b fb 66 0f 1f 44 00 00 <e9> 06 fc ff ff 0f 0b e9 53 fa ff ff 0f 0b 0f 0b 0f 0b e9 e0 fe ff
RSP: 0018:ffffc900048d6cd8 EFLAGS: 00000282
RAX: 1ffffffff126dec0 RBX: 1ffff9200091ad9d RCX: 1ffff9200091ad84
RDX: dffffc0000000000 RSI: ffffffff87cb2d00 RDI: ffffffff88129500
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8bfaac97
R10: fffffbfff17f5592 R11: 615f6e616d746162 R12: 0000000000000000
R13: ffff88812120ddd8 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:359 [inline]
 batadv_tt_local_purge_pending_clients+0xf2/0x3b0 net/batman-adv/translation-table.c:3683
 batadv_tt_local_resize_to_mtu+0x80/0xe0 net/batman-adv/translation-table.c:3986
 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+0x7f1/0x2f10 net/core/rtnetlink.c:2715
 __rtnl_newlink+0xabb/0x1360 net/core/rtnetlink.c:3376
 rtnl_newlink+0x5a/0x90 net/core/rtnetlink.c:3491
 rtnetlink_rcv_msg+0x32f/0x860 net/core/rtnetlink.c:5553
 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+0x2d/0x70 arch/x86/entry/common.c:46
 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:00007fb4780ff188 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: 00007fff046dcb3f R14: 00007fb4780ff300 R15: 0000000000022000