================================================================== BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer write to 0xffffffff85f0ef50 of 4 bytes by interrupt on cpu 0: tick_sched_do_timer+0xb4/0xd0 kernel/time/tick-sched.c:141 tick_sched_timer+0x3f/0xd0 kernel/time/tick-sched.c:1313 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline] smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1138 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 __sanitizer_cov_trace_switch+0x37/0x70 kernel/kcov.c:310 __read_once_size+0x20/0x110 include/linux/compiler.h:232 arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline] atomic_read include/asm-generic/atomic-instrumented.h:28 [inline] tcp_space include/net/tcp.h:1416 [inline] __tcp_select_window+0xac/0x550 net/ipv4/tcp_output.c:2773 tcp_select_window net/ipv4/tcp_output.c:264 [inline] __tcp_transmit_skb+0x6e0/0x1c80 net/ipv4/tcp_output.c:1193 tcp_transmit_skb net/ipv4/tcp_output.c:1254 [inline] tcp_write_xmit+0x5a3/0x31e0 net/ipv4/tcp_output.c:2517 __tcp_push_pending_frames+0x72/0x1b0 net/ipv4/tcp_output.c:2693 tcp_push+0x1ec/0x3e0 net/ipv4/tcp.c:725 tcp_sendmsg_locked+0x1de3/0x20f0 net/ipv4/tcp.c:1403 tcp_sendmsg+0x35/0x50 net/ipv4/tcp.c:1433 inet_sendmsg+0x69/0x90 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0x98/0xc0 net/socket.c:672 sock_write_iter+0x186/0x240 net/socket.c:1004 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write+0x303/0x400 fs/read_write.c:484 __vfs_write+0x9e/0xb0 fs/read_write.c:497 vfs_write fs/read_write.c:559 [inline] vfs_write+0x189/0x380 fs/read_write.c:543 ksys_write+0x16a/0x1a0 fs/read_write.c:612 __do_sys_write fs/read_write.c:624 [inline] __se_sys_write fs/read_write.c:621 [inline] __x64_sys_write+0x49/0x60 fs/read_write.c:621 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffffffff85f0ef50 of 4 bytes by task 0 on cpu 1: tick_nohz_stop_tick kernel/time/tick-sched.c:780 [inline] __tick_nohz_idle_stop_tick kernel/time/tick-sched.c:973 [inline] tick_nohz_idle_stop_tick+0x191/0x680 kernel/time/tick-sched.c:994 cpuidle_idle_call kernel/sched/idle.c:151 [inline] do_idle+0x1ad/0x290 kernel/sched/idle.c:269 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361 start_secondary+0x169/0x1b0 arch/x86/kernel/smpboot.c:268 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================