================================================================== BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer write to 0xffffffff85caf310 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:1289 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x288/0x600 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1509 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:84 [inline] __kcsan_check_watchpoint+0x95/0x180 kernel/kcsan/core.c:322 __tsan_read8+0x15/0x30 kernel/kcsan/kcsan.c:31 ip_hdr include/linux/ip.h:21 [inline] tcp_v4_inbound_md5_hash+0x41/0x230 net/ipv4/tcp_ipv4.c:1297 tcp_v4_rcv+0x16c0/0x1bf0 net/ipv4/tcp_ipv4.c:1897 ip_protocol_deliver_rcu+0x51/0x470 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 read to 0xffffffff85caf310 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:1289 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x288/0x600 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1509 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 __sanitizer_cov_trace_switch+0x4e/0x80 kernel/kcov.c:224 __check_object_size+0xe7/0x33f mm/usercopy.c:263 check_object_size include/linux/thread_info.h:119 [inline] check_copy_size include/linux/thread_info.h:150 [inline] copy_to_iter include/linux/uio.h:135 [inline] simple_copy_to_iter+0x31/0x60 net/core/datagram.c:515 __skb_datagram_iter+0x28a/0x470 net/core/datagram.c:445 skb_copy_datagram_iter+0x66/0x170 net/core/datagram.c:529 skb_copy_datagram_msg include/linux/skbuff.h:3426 [inline] tcp_recvmsg+0x106c/0x1a30 net/ipv4/tcp.c:2132 inet_recvmsg+0xbb/0x250 net/ipv4/af_inet.c:838 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7290 Comm: syz-fuzzer Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================