audit: type=1800 audit(1552230736.720:54): pid=14950 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.1" name="memory.events" dev="sda1" ino=17230 res=0 32-bit node address hash set to aa1414ac rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10500 ticks this GP) idle=d12/1/0x4000000000000002 softirq=27164/27164 fqs=5249 rcu: (t=10502 jiffies g=28413 q=142) NMI backtrace for cpu 0 CPU: 0 PID: 7691 Comm: kworker/0:4 Not tainted 5.0.0+ #97 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree.c:1211 print_cpu_stall kernel/rcu/tree.c:1348 [inline] check_cpu_stall kernel/rcu/tree.c:1422 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks.cold+0x500/0xa4a kernel/rcu/tree.c:2521 update_process_times+0x32/0x80 kernel/time/timer.c:1635 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:check_memory_region+0xbb/0x190 mm/kasan/generic.c:192 Code: c0 08 4c 39 c0 0f 84 8f 00 00 00 48 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 0a 80 38 00 74 f2 48 85 c0 75 5e <5b> 41 5c 41 5d 5d c3 41 bd 08 00 00 00 45 29 c5 4d 89 e0 4f 8d 4c RSP: 0018:ffff88808d307910 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: fffff91ffff8d687 RBX: fffff91ffff8d687 RCX: ffffffff81579127 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffe8ffffc6b430 RBP: ffff88808d307928 R08: 1ffffd1ffff8d686 R09: fffff91ffff8d687 R10: fffff91ffff8d686 R11: ffffe8ffffc6b433 R12: fffff91ffff8d686 R13: 0000000000000003 R14: fffff91ffff8d686 R15: 000000000000000d kasan_check_read+0x11/0x20 mm/kasan/common.c:100 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] virt_spin_lock arch/x86/include/asm/qspinlock.h:83 [inline] native_queued_spin_lock_slowpath+0xb7/0x970 kernel/locking/qspinlock.c:337 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:653 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:50 [inline] queued_spin_lock include/asm-generic/qspinlock.h:90 [inline] do_raw_spin_lock+0x20e/0x2e0 kernel/locking/spinlock_debug.c:113 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x37/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] nf_ct_add_to_dying_list+0xdb/0x210 net/netfilter/nf_conntrack_core.c:472 nf_ct_delete_from_lists+0x3c1/0x530 net/netfilter/nf_conntrack_core.c:619 nf_ct_delete net/netfilter/nf_conntrack_core.c:646 [inline] nf_ct_delete+0x1d0/0x4c0 net/netfilter/nf_conntrack_core.c:624 nf_ct_kill include/net/netfilter/nf_conntrack.h:219 [inline] nf_ct_gc_expired net/netfilter/nf_conntrack_core.c:688 [inline] nf_ct_gc_expired+0x2c0/0x350 net/netfilter/nf_conntrack_core.c:682 gc_worker+0xafa/0xea0 net/netfilter/nf_conntrack_core.c:1234 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173 worker_thread+0x98/0xe40 kernel/workqueue.c:2319 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352