================================================================== BUG: KCSAN: data-race in exit_signals / prepare_signal write to 0xffff88808368d024 of 4 bytes by task 19804 on cpu 0: exit_signals+0x124/0x580 kernel/signal.c:2845 do_exit+0x19a/0x16c0 kernel/exit.c:762 do_group_exit+0x17a/0x180 kernel/exit.c:903 __do_sys_exit_group+0xb/0x10 kernel/exit.c:914 __se_sys_exit_group+0x5/0x10 kernel/exit.c:912 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:912 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88808368d024 of 4 bytes by interrupt on cpu 1: sig_task_ignored kernel/signal.c:94 [inline] sig_ignored kernel/signal.c:119 [inline] prepare_signal+0x88d/0xdb0 kernel/signal.c:961 send_sigqueue+0xea/0x450 kernel/signal.c:1860 posix_timer_event kernel/time/posix-timers.c:354 [inline] posix_timer_fn+0xe8/0x210 kernel/time/posix-timers.c:380 __run_hrtimer+0x154/0x4b0 kernel/time/hrtimer.c:1524 __hrtimer_run_queues kernel/time/hrtimer.c:1588 [inline] hrtimer_interrupt+0x37c/0xa40 kernel/time/hrtimer.c:1650 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0xa3/0x280 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0x80/0xd0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 is_atomic kernel/kcsan/core.c:240 [inline] should_watch kernel/kcsan/core.c:257 [inline] check_access kernel/kcsan/core.c:603 [inline] __tsan_read8+0x12f/0x180 kernel/kcsan/core.c:801 ktime_get_ts64+0xa8/0x310 kernel/time/timekeeping.c:894 posix_get_monotonic_timespec+0x2b/0xe0 kernel/time/posix-timers.c:199 __do_sys_clock_gettime kernel/time/posix-timers.c:1092 [inline] __se_sys_clock_gettime kernel/time/posix-timers.c:1082 [inline] __x64_sys_clock_gettime+0xed/0x150 kernel/time/posix-timers.c:1082 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19811 Comm: syz-executor.0 Not tainted 5.9.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================