syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
	(detected by 1, t=10502 jiffies, g=154697, q=131)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4295049982-4295039482), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10500 jiffies! g154697 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27984 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4683 [inline]
 __schedule+0x93a/0x26f0 kernel/sched/core.c:5940
 schedule+0xd3/0x270 kernel/sched/core.c:6019
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1879
 rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
 rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 8465 Comm: syz-executor.4 Not tainted 5.14.0-rc3-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:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_check_gp_kthread_starvation.cold+0x1d1/0x1d6 kernel/rcu/tree_stall.h:479
 print_other_cpu_stall kernel/rcu/tree_stall.h:584 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:709 [inline]
 rcu_pending kernel/rcu/tree.c:3922 [inline]
 rcu_sched_clock_irq+0x2001/0x20c0 kernel/rcu/tree.c:2641
 update_process_times+0x16d/0x200 kernel/time/timer.c:1783
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 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:638
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:90 [inline]
RIP: 0010:kvm_wait arch/x86/kernel/kvm.c:888 [inline]
RIP: 0010:kvm_wait+0xaf/0xf0 arch/x86/kernel/kvm.c:871
Code: 10 c3 c3 89 74 24 0c 48 89 3c 24 e8 db a2 48 00 8b 74 24 0c 48 8b 3c 24 eb 82 e8 ec a7 48 00 eb 07 0f 00 2d 93 e3 55 08 fb f4 <eb> 9b eb 07 0f 00 2d 86 e3 55 08 f4 eb c5 89 74 24 0c 48 89 3c 24
RSP: 0018:ffffc9000178f4b8 EFLAGS: 00000206
RAX: 00000000009b0135 RBX: 0000000000000000 RCX: 1ffffffff1f9ab2a
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8ba97940 R08: 0000000000000001 R09: ffffffff8fcd28a7
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: fffffbfff1752f28 R14: 0000000000000001 R15: ffff8880b9d52880
 pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x8b8/0xb40 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock+0x200/0x2b0 kernel/locking/spinlock_debug.c:113
 spin_lock include/linux/spinlock.h:354 [inline]
 preload_this_cpu_lock mm/vmalloc.c:1466 [inline]
 alloc_vmap_area+0x1dd/0x1e30 mm/vmalloc.c:1507
 __get_vm_area_node.constprop.0+0x128/0x380 mm/vmalloc.c:2389
 __vmalloc_node_range+0x12e/0x960 mm/vmalloc.c:2956
 __vmalloc_node mm/vmalloc.c:3015 [inline]
 vzalloc+0x67/0x80 mm/vmalloc.c:3085
 xt_counters_alloc+0x4c/0x70 net/netfilter/x_tables.c:1370
 __do_replace+0x9a/0x890 net/ipv6/netfilter/ip6_tables.c:1065
 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline]
 do_ip6t_set_ctl+0x90d/0xb90 net/ipv6/netfilter/ip6_tables.c:1638
 nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x122/0x180 net/ipv6/ipv6_sockglue.c:1008
 tcp_setsockopt+0x136/0x24a0 net/ipv4/tcp.c:3657
 __sys_setsockopt+0x2db/0x610 net/socket.c:2159
 __do_sys_setsockopt net/socket.c:2170 [inline]
 __se_sys_setsockopt net/socket.c:2167 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2167
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x467c2a
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 36 00 00 00 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:00007ffecc7b97b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000029 RCX: 0000000000467c2a
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 00007ffecc7b97e0 R08: 00000000000002e8 R09: 0079746972756365
R10: 0000000000542fe0 R11: 0000000000000206 R12: 00007ffecc7b9840
R13: 0000000000000003 R14: 00007ffecc7b97dc R15: 0000000000542f80