================================================================== BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer read to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 1: tick_sched_do_timer+0x33/0xe0 kernel/time/tick-sched.c:128 tick_sched_timer+0x43/0xe0 kernel/time/tick-sched.c:1292 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x288/0x600 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 __kcsan_setup_watchpoint+0x4/0x4a0 kernel/kcsan/core.c:295 __tsan_read8 kernel/kcsan/kcsan.c:36 [inline] __tsan_read8+0x2c/0x30 kernel/kcsan/kcsan.c:36 tcp_v4_rcv+0x1792/0x1bb0 net/ipv4/tcp_ipv4.c:1923 ip_protocol_deliver_rcu+0x4d/0x420 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x110/0x140 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_local_deliver+0x133/0x210 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0x121/0x160 net/ipv4/ip_input.c:413 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_rcv+0x18f/0x1a0 net/ipv4/ip_input.c:523 write to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 0: tick_sched_do_timer+0xc0/0xe0 kernel/time/tick-sched.c:132 tick_sched_timer+0x43/0xe0 kernel/time/tick-sched.c:1292 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x288/0x600 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 find_watchpoint kernel/kcsan/core.c:63 [inline] __kcsan_check_watchpoint+0xa2/0x180 kernel/kcsan/core.c:266 __tsan_read8+0x15/0x30 kernel/kcsan/kcsan.c:36 nf_ct_net include/net/netfilter/nf_conntrack.h:136 [inline] nf_ct_key_equal net/netfilter/nf_conntrack_core.c:697 [inline] ____nf_conntrack_find net/netfilter/nf_conntrack_core.c:751 [inline] __nf_conntrack_find_get+0x4bf/0x880 net/netfilter/nf_conntrack_core.c:777 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1547 [inline] nf_conntrack_in+0x2ef/0xa80 net/netfilter/nf_conntrack_core.c:1709 ipv4_conntrack_local+0xbe/0x130 net/netfilter/nf_conntrack_proto.c:200 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0x83/0x160 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:260 [inline] __ip_local_out+0x1f7/0x2b0 net/ipv4/ip_output.c:114 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 7218 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================