rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10499 ticks this GP) idle=2b2/1/0x4000000000000002 softirq=233931/233931 fqs=5241 rcu: (t=10500 jiffies g=340913 q=546) NMI backtrace for cpu 0 CPU: 0 PID: 18100 Comm: syz-executor.4 Not tainted 5.0.0-rc7+ #81 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+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:kasan_check_read+0x0/0x20 mm/kasan/common.c:99 Code: ef e9 14 eb ff ff 48 8b 73 58 89 c2 48 c7 c7 b8 df 5b 88 f7 da e8 b4 c4 b3 ff e9 c4 f5 ff ff 90 90 90 90 90 90 90 90 90 90 90 <55> 89 f6 31 d2 48 89 e5 48 8b 4d 08 e8 ff 23 00 00 5d c3 0f 1f 00 RSP: 0018:ffff888071fe6df0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffffe8ffffc73470 RCX: ffffffff8157be27 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffe8ffffc73470 RBP: ffff888071fe6eb8 R08: 1ffffd1ffff8e68e R09: fffff91ffff8e68f R10: fffff91ffff8e68e R11: ffffe8ffffc73473 R12: 0000000000000001 R13: 0000000000000003 R14: fffff91ffff8e68e R15: 0000000000000003 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_unconfirmed_list net/netfilter/nf_conntrack_core.c:462 [inline] init_conntrack.isra.0+0xa15/0x1180 net/netfilter/nf_conntrack_core.c:1437 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1479 [inline] nf_conntrack_in+0xa68/0x1070 net/netfilter/nf_conntrack_core.c:1585 ipv6_conntrack_local+0x1e/0x30 net/netfilter/nf_conntrack_proto.c:438 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0xbf/0x1f0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] ip6_xmit+0x11c6/0x20c0 net/ipv6/ip6_output.c:275 inet6_csk_xmit+0x2fb/0x5d0 net/ipv6/inet6_connection_sock.c:139 __tcp_transmit_skb+0x1a5f/0x3680 net/ipv4/tcp_output.c:1160 tcp_transmit_skb net/ipv4/tcp_output.c:1176 [inline] tcp_send_syn_data net/ipv4/tcp_output.c:3495 [inline] tcp_connect+0x1e58/0x40a0 net/ipv4/tcp_output.c:3534 tcp_v6_connect+0x15fa/0x21c0 net/ipv6/tcp_ipv6.c:321 __inet_stream_connect+0x83f/0xea0 net/ipv4/af_inet.c:655 tcp_sendmsg_fastopen net/ipv4/tcp.c:1161 [inline] tcp_sendmsg_locked+0x25b1/0x34a0 net/ipv4/tcp.c:1208 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1443 inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 __sys_sendto+0x262/0x380 net/socket.c:1786 __do_sys_sendto net/socket.c:1798 [inline] __se_sys_sendto net/socket.c:1794 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1794 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: ad b8 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 b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5d262e6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457e29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 000000000073bf00 R08: 000000002031e000 R09: 000000000000001c R10: 0000000020000004 R11: 0000000000000246 R12: 00007f5d262e76d4 R13: 00000000004c555d R14: 00000000004d94a0 R15: 00000000ffffffff rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 10658 jiffies s: 8505 root: 0x1/. rcu: blocking rcu_node structures: Task dump for CPU 0: syz-executor.4 R running task 26720 18100 9613 0x8000000e Call Trace: