KCSAN: data-race in __ptrace_unlink / do

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __ptrace_unlink / do_exit kernel	6	4	2197d	2250d	0/29	auto-closed as invalid on 2020/09/28 07:37
upstream	KCSAN: data-race in __ptrace_unlink / do_exit (2) kernel	6	4	2123d	2092d	0/29	auto-closed as invalid on 2020/12/21 11:46
upstream	KCSAN: data-race in __ptrace_unlink / do_exit (5) kernel	6	2	1936d	1947d	0/29	auto-closed as invalid on 2021/06/15 19:49
upstream	KCSAN: data-race in __ptrace_unlink / do_exit (6) kernel	6	7	1763d	1862d	0/29	auto-closed as invalid on 2021/12/06 01:33
upstream	KCSAN: data-race in __ptrace_unlink / do_exit (4) kernel	6	1	2016d	2016d	0/29	auto-closed as invalid on 2021/03/28 11:03

================================================================== BUG: KCSAN: data-race in __ptrace_unlink / do_exit write to 0xffff88802fd8a030 of 4 bytes by task 4144 on cpu 0: __ptrace_unlink+0x162/0x2f0 kernel/ptrace.c:132 __ptrace_detach+0x1b/0x1a0 kernel/ptrace.c:522 exit_ptrace+0x93/0x160 kernel/ptrace.c:582 forget_original_parent kernel/exit.c:627 [inline] exit_notify kernel/exit.c:667 [inline] do_exit+0x1219/0x1630 kernel/exit.c:843 do_group_exit+0xc8/0x170 kernel/exit.c:920 get_signal+0xd5e/0x1440 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a/0x270 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x109/0x1a0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88802fd8a030 of 4 bytes by task 4140 on cpu 1: ptrace_event_enabled include/linux/ptrace.h:142 [inline] ptrace_event include/linux/ptrace.h:157 [inline] do_exit+0xff/0x1630 kernel/exit.c:764 do_group_exit+0xc8/0x170 kernel/exit.c:920 get_signal+0xd5e/0x1440 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a/0x270 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x109/0x1a0 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 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: 4140 Comm: syz-executor.5 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================