================================================================== BUG: KCSAN: data-race in do_exit / ptrace_stop write to 0xffff88803c4c2064 of 4 bytes by task 17649 on cpu 0: freezer_count include/linux/freezer.h:121 [inline] freezable_schedule include/linux/freezer.h:173 [inline] ptrace_stop+0x394/0x650 kernel/signal.c:2215 ptrace_do_notify kernel/signal.c:2268 [inline] ptrace_notify+0x109/0x160 kernel/signal.c:2278 ptrace_report_syscall include/linux/tracehook.h:66 [inline] tracehook_report_syscall_exit include/linux/tracehook.h:129 [inline] arch_syscall_exit_tracehook include/linux/entry-common.h:284 [inline] syscall_exit_work+0xb2/0x1d0 kernel/entry/common.c:232 syscall_exit_to_user_mode_prepare+0x2f/0x40 kernel/entry/common.c:259 syscall_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:265 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88803c4c2064 of 4 bytes by task 17647 on cpu 1: find_alive_thread kernel/exit.c:493 [inline] find_new_reaper kernel/exit.c:542 [inline] forget_original_parent kernel/exit.c:617 [inline] exit_notify kernel/exit.c:650 [inline] do_exit+0x7e0/0x16c0 kernel/exit.c:826 do_group_exit+0xcb/0x180 kernel/exit.c:903 get_signal+0xe9f/0x1650 kernel/signal.c:2757 arch_do_signal+0x25/0x270 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x124/0x210 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:267 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 17647 Comm: syz-executor.5 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================