================================================================== BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 write to 0xffffffff8624d7c8 of 8 bytes by interrupt on cpu 0: tick_do_update_jiffies64+0x100/0x250 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:1303 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x274/0x5f0 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1641 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:829 __read_once_size+0x38/0xe0 include/linux/compiler.h:232 compound_head include/linux/page-flags.h:174 [inline] virt_to_head_page include/linux/mm.h:733 [inline] receive_mergeable drivers/net/virtio_net.c:789 [inline] receive_buf+0x755/0x30b0 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:6532 [inline] net_rx_action+0x3ae/0xa90 net/core/dev.c:6600 __do_softirq+0x115/0x33f kernel/softirq.c:292 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603 smpboot_thread_fn+0x37d/0x4a0 kernel/smpboot.c:165 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 read to 0xffffffff8624d7c8 of 8 bytes by interrupt on cpu 1: tick_do_update_jiffies64+0x2b/0x250 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:1303 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x274/0x5f0 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1641 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:829 should_watch kernel/kcsan/core.c:243 [inline] check_access kernel/kcsan/core.c:528 [inline] __tsan_read4+0xb4/0x100 kernel/kcsan/core.c:658 tcp_space include/net/tcp.h:1400 [inline] tcp_grow_window.isra.0+0x6a/0x4d0 net/ipv4/tcp_input.c:414 tcp_event_data_recv+0x68f/0x990 net/ipv4/tcp_input.c:719 tcp_rcv_established+0xbfe/0xf50 net/ipv4/tcp_input.c:5664 tcp_v4_do_rcv+0x3b5/0x520 net/ipv4/tcp_ipv4.c:1562 sk_backlog_rcv include/net/sock.h:949 [inline] __release_sock+0x135/0x1e0 net/core/sock.c:2437 release_sock+0x61/0x160 net/core/sock.c:2953 tcp_recvmsg+0x68f/0x1c90 net/ipv4/tcp.c:2186 inet_recvmsg+0xbb/0x250 net/ipv4/af_inet.c:838 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg net/socket.c:891 [inline] sock_recvmsg+0x92/0xb0 net/socket.c:887 sock_read_iter+0x15f/0x1e0 net/socket.c:969 call_read_iter include/linux/fs.h:1896 [inline] new_sync_read+0x4b1/0x4f0 fs/read_write.c:414 __vfs_read+0xb1/0xc0 fs/read_write.c:427 vfs_read fs/read_write.c:461 [inline] vfs_read+0x143/0x2c0 fs/read_write.c:446 ksys_read+0x17b/0x1b0 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x4c/0x60 fs/read_write.c:595 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7898 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================