================================================================== BUG: KCSAN: data-race in fasync_remove_entry / kill_fasync write to 0xffff8880b330c300 of 8 bytes by task 10031 on cpu 0: fasync_remove_entry+0xba/0x120 fs/fcntl.c:882 fasync_helper+0xcf/0xdc fs/fcntl.c:981 perf_fasync+0x6c/0xa0 kernel/events/core.c:6002 __fput+0x46a/0x520 fs/file_table.c:277 ____fput+0x1f/0x30 fs/file_table.c:313 task_work_run+0xf6/0x130 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x2b4/0x2c0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880b330c300 of 8 bytes by interrupt on cpu 1: kill_fasync+0x3f/0x180 fs/fcntl.c:1019 perf_event_wakeup+0x11f/0x160 kernel/events/core.c:6042 perf_pending_event+0x12d/0x170 kernel/events/core.c:6098 irq_work_run_list+0x136/0x190 kernel/irq_work.c:156 irq_work_run+0x48/0xa0 kernel/irq_work.c:172 smp_irq_work_interrupt+0x3f/0x100 arch/x86/kernel/irq_work.c:21 irq_work_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:860 arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x51/0x80 kernel/locking/spinlock.c:191 try_to_wake_up+0x3d2/0x6e0 kernel/sched/core.c:2646 wake_up_process kernel/sched/core.c:2668 [inline] wake_up_q+0x5b/0xa0 kernel/sched/core.c:496 futex_wake+0x322/0x350 kernel/futex.c:1696 do_futex+0x2be/0x18d0 kernel/futex.c:3886 __do_sys_futex kernel/futex.c:3942 [inline] __se_sys_futex kernel/futex.c:3910 [inline] __x64_sys_futex+0x2cd/0x3f0 kernel/futex.c:3910 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: 10035 Comm: syz-executor.5 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================