================================================================== BUG: KCSAN: data-race in __neigh_event_send / neigh_resolve_output write to 0xffff888135363c84 of 1 bytes by interrupt on cpu 1: __neigh_event_send+0x458/0xbc0 net/core/neighbour.c:1158 neigh_event_send_probe include/net/neighbour.h:473 [inline] neigh_event_send include/net/neighbour.h:479 [inline] neigh_resolve_output+0x110/0x430 net/core/neighbour.c:1512 neigh_output include/net/neighbour.h:549 [inline] ip_finish_output2+0x74b/0x850 net/ipv4/ip_output.c:228 ip_finish_output+0xf3/0x250 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0xf3/0x1a0 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:451 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0xa2e/0xa50 net/ipv4/ip_output.c:532 ip_queue_xmit+0x34/0x40 net/ipv4/ip_output.c:546 __tcp_transmit_skb+0x12a8/0x1790 net/ipv4/tcp_output.c:1403 tcp_transmit_skb net/ipv4/tcp_output.c:1421 [inline] tcp_xmit_probe_skb net/ipv4/tcp_output.c:4010 [inline] tcp_write_wakeup+0x47a/0x730 net/ipv4/tcp_output.c:4063 tcp_send_probe0+0x2c/0x2b0 net/ipv4/tcp_output.c:4078 tcp_probe_timer net/ipv4/tcp_timer.c:398 [inline] tcp_write_timer_handler+0x3eb/0x5d0 net/ipv4/tcp_timer.c:626 tcp_write_timer+0xb6/0x160 net/ipv4/tcp_timer.c:642 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1421 expire_timers+0x116/0x240 kernel/time/timer.c:1466 __run_timers+0x350/0x400 kernel/time/timer.c:1737 run_timer_softirq+0x2e/0x60 kernel/time/timer.c:1750 __do_softirq+0x158/0x2e3 kernel/softirq.c:558 __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0x41/0x70 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x8d/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline] acpi_idle_do_entry drivers/acpi/processor_idle.c:551 [inline] acpi_idle_enter+0x27b/0x300 drivers/acpi/processor_idle.c:686 cpuidle_enter_state+0x2ee/0x7a0 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:236 [inline] do_idle+0x1b2/0x250 kernel/sched/idle.c:303 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:400 start_secondary+0x78/0x80 arch/x86/kernel/smpboot.c:266 secondary_startup_64_no_verify+0xc4/0xcb read to 0xffff888135363c84 of 1 bytes by interrupt on cpu 0: neigh_event_send_probe include/net/neighbour.h:472 [inline] neigh_event_send include/net/neighbour.h:479 [inline] neigh_resolve_output+0x6f/0x430 net/core/neighbour.c:1512 neigh_output include/net/neighbour.h:549 [inline] ip_finish_output2+0x74b/0x850 net/ipv4/ip_output.c:228 ip_finish_output+0xf3/0x250 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0xf3/0x1a0 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:451 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0xa2e/0xa50 net/ipv4/ip_output.c:532 ip_queue_xmit+0x34/0x40 net/ipv4/ip_output.c:546 __tcp_transmit_skb+0x12a8/0x1790 net/ipv4/tcp_output.c:1403 tcp_transmit_skb net/ipv4/tcp_output.c:1421 [inline] tcp_xmit_probe_skb net/ipv4/tcp_output.c:4010 [inline] tcp_write_wakeup+0x47a/0x730 net/ipv4/tcp_output.c:4063 tcp_send_probe0+0x2c/0x2b0 net/ipv4/tcp_output.c:4078 tcp_probe_timer net/ipv4/tcp_timer.c:398 [inline] tcp_write_timer_handler+0x3eb/0x5d0 net/ipv4/tcp_timer.c:626 tcp_write_timer+0xb6/0x160 net/ipv4/tcp_timer.c:642 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1421 expire_timers+0x116/0x240 kernel/time/timer.c:1466 __run_timers+0x350/0x400 kernel/time/timer.c:1737 run_timer_softirq+0x2e/0x60 kernel/time/timer.c:1750 __do_softirq+0x158/0x2e3 kernel/softirq.c:558 __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0x41/0x70 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x8d/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline] acpi_idle_do_entry drivers/acpi/processor_idle.c:551 [inline] acpi_idle_enter+0x27b/0x300 drivers/acpi/processor_idle.c:686 cpuidle_enter_state+0x2ee/0x7a0 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:236 [inline] do_idle+0x1b2/0x250 kernel/sched/idle.c:303 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:400 rest_init+0xe8/0xf0 init/main.c:726 start_kernel+0x0/0x669 init/main.c:882 start_kernel+0x5e4/0x669 init/main.c:1140 secondary_startup_64_no_verify+0xc4/0xcb value changed: 0x20 -> 0x01 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.18.0-rc5-syzkaller-00006-g9050ba3a61a4-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================