rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10500 ticks this GP) idle=f1a/1/0x4000000000000004 softirq=15970/15970 fqs=0 (t=10500 jiffies g=11765 q=624) rcu: rcu_preempt kthread starved for 10500 jiffies! g11765 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29152 10 2 0x80004000 Call Trace: NMI backtrace for cpu 1 CPU: 1 PID: 8915 Comm: syz-executor.2 Not tainted 5.6.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1e9/0x30e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x169/0x250 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3030 [inline] rcu_sched_clock_irq+0x171f/0x1970 kernel/rcu/tree.c:2276 update_process_times+0x12c/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:171 [inline] tick_sched_timer+0x254/0x410 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x3cf/0x7d0 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:92 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:109 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline] RIP: 0010:check_memory_region+0x74/0x2e0 mm/kasan/generic.c:192 Code: 00 00 fc ff df 4d 01 ea 4d 89 d6 4d 29 ce 49 83 fe 10 7f 2c 4d 85 f6 0f 84 aa 01 00 00 4c 89 cb 4c 29 d3 0f 1f 00 45 0f b6 19 <45> 84 db 0f 85 f3 01 00 00 49 ff c1 48 ff c3 75 eb e9 87 01 00 00 RSP: 0018:ffffc90000da8b38 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffffc90000da8c01 RBX: fffffffffffffffe RCX: ffffffff87015a2f RDX: 0000000000000000 RSI: 0000000000000010 RDI: ffffffff887a8ee0 RBP: ffffc90000da8d08 R08: dffffc0000000000 R09: fffffbfff10f51dc R10: fffffbfff10f51de R11: 0000000000000000 R12: 1ffffffff10f51dc R13: dffffc0000000001 R14: 0000000000000002 R15: ffffc90000da8c70 memcpy+0x25/0x50 mm/kasan/common.c:127 icmpv6_flow_init+0x5f/0x120 net/ipv6/icmp.c:977 ndisc_send_skb+0x207/0xd00 net/ipv6/ndisc.c:484 addrconf_rs_timer+0x226/0x680 net/ipv6/addrconf.c:3879 call_timer_fn+0x91/0x160 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0x776/0x970 kernel/time/timer.c:1773 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1786 __do_softirq+0x268/0x7c5 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x223/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1146 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:lock_release+0x3cf/0x720 kernel/locking/lockdep.c:4505 Code: 48 c1 e8 03 42 80 3c 28 00 74 0c 48 c7 c7 58 d4 0a 89 e8 24 da 56 00 48 83 3d b4 c3 b0 07 00 0f 84 24 03 00 00 4c 89 e7 57 9d <0f> 1f 44 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 58 0f 85 08 RSP: 0018:ffffc90002b07d20 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1215a8b RBX: 1ffff110125ae94a RCX: ffffffff815a1519 RDX: ffff888092d74a50 RSI: ffff88809fe94a48 RDI: 0000000000000282 RBP: 9ad52d74a0594fb9 R08: dffffc0000000000 R09: fffffbfff1293765 R10: fffffbfff1293765 R11: 0000000000000000 R12: 0000000000000282 R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff888092d74a54 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:183 spin_unlock include/linux/spinlock.h:378 [inline] fasync_insert_entry+0x1e9/0x270 fs/fcntl.c:943 fasync_add_entry fs/fcntl.c:966 [inline] fasync_helper+0x59/0xb0 fs/fcntl.c:984 perf_fasync+0x83/0xb0 kernel/events/core.c:6011 setfl fs/fcntl.c:73 [inline] do_fcntl+0xd28/0x11b0 fs/fcntl.c:347 __do_sys_fcntl fs/fcntl.c:463 [inline] __se_sys_fcntl+0xd5/0x1b0 fs/fcntl.c:448 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c4a9 Code: ad 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5c840bcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 00007f5c840bd6d4 RCX: 000000000045c4a9 RDX: 0000000000042800 RSI: 0000000000000004 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000000c5 R14: 00000000004c316e R15: 000000000076bf2c