KCSAN: data-race in ptrace_check_attach / zap_other

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ptrace_check_attach / zap_other_threads kernel	6	1	2208d	2208d	0/29	auto-closed as invalid on 2020/09/05 20:28
upstream	KCSAN: data-race in ptrace_check_attach / zap_other_threads (2) kernel	6	1	2173d	2173d	0/29	auto-closed as invalid on 2020/10/10 22:50
upstream	KCSAN: data-race in ptrace_check_attach / zap_other_threads (5) kernel	6	9	1905d	1940d	0/29	auto-closed as invalid on 2021/07/05 18:29
upstream	KCSAN: data-race in ptrace_check_attach / zap_other_threads (4) kernel	6	1	2002d	2002d	0/29	auto-closed as invalid on 2021/03/30 13:55

================================================================== BUG: KCSAN: data-race in ptrace_check_attach / zap_other_threads read-write to 0xffff888134b5c4a8 of 8 bytes by task 14110 on cpu 1: task_clear_jobctl_pending kernel/signal.c:344 [inline] zap_other_threads+0x90/0x1d0 kernel/signal.c:1356 do_group_exit+0x140/0x170 kernel/exit.c:898 __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 0xffff888134b5c4a8 of 8 bytes by task 14119 on cpu 0: ptrace_freeze_traced kernel/ptrace.c:178 [inline] ptrace_check_attach+0xdc/0x230 kernel/ptrace.c:247 __do_sys_ptrace kernel/ptrace.c:1272 [inline] __se_sys_ptrace+0xdb/0x2e0 kernel/ptrace.c:1242 __x64_sys_ptrace+0x51/0x60 kernel/ptrace.c:1242 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: 0 PID: 14119 Comm: syz-executor.4 Not tainted 5.10.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================