================================================================== BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: tick_do_update_jiffies64+0x105/0x260 kernel/time/tick-sched.c:73 tick_sched_do_timer+0xd4/0xe0 kernel/time/tick-sched.c:138 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 should_watch kernel/kcsan/core.c:188 [inline] __kcsan_setup_watchpoint+0xc3/0x510 kernel/kcsan/core.c:348 __tsan_write4 kernel/kcsan/kcsan.c:30 [inline] __tsan_write4+0x32/0x40 kernel/kcsan/kcsan.c:30 skb_reserve include/linux/skbuff.h:2323 [inline] __napi_alloc_skb+0xed/0x210 net/core/skbuff.c:535 napi_alloc_skb include/linux/skbuff.h:2807 [inline] page_to_skb+0x8d/0x480 drivers/net/virtio_net.c:384 receive_mergeable drivers/net/virtio_net.c:924 [inline] receive_buf+0x17c7/0x30b0 drivers/net/virtio_net.c:1033 virtnet_receive drivers/net/virtio_net.c:1323 [inline] virtnet_poll+0x436/0x7d0 drivers/net/virtio_net.c:1428 napi_poll net/core/dev.c:6392 [inline] net_rx_action+0x3ae/0xa90 net/core/dev.c:6460 read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: tick_do_update_jiffies64+0x2b/0x260 kernel/time/tick-sched.c:62 tick_sched_do_timer+0xd4/0xe0 kernel/time/tick-sched.c:138 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 __read_once_size include/linux/compiler.h:227 [inline] arch_atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline] atomic64_read include/asm-generic/atomic-instrumented.h:925 [inline] atomic_long_read include/asm-generic/atomic-long.h:28 [inline] find_watchpoint kernel/kcsan/core.c:85 [inline] __kcsan_check_watchpoint+0xbb/0x180 kernel/kcsan/core.c:307 __tsan_read4+0x15/0x30 kernel/kcsan/kcsan.c:30 tcp_rcv_rtt_measure net/ipv4/tcp_input.c:560 [inline] tcp_event_data_recv+0x195/0x990 net/ipv4/tcp_input.c:684 tcp_rcv_established+0xbfe/0xf50 net/ipv4/tcp_input.c:5662 tcp_v4_do_rcv+0x381/0x4e0 net/ipv4/tcp_ipv4.c:1561 sk_backlog_rcv include/net/sock.h:945 [inline] __release_sock+0x135/0x1e0 net/core/sock.c:2435 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7155 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================