KCSAN: data-race in complete_signal / ptrace

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in complete_signal / ptrace_attach (5) kernel	6	1	1810d	1810d	0/29	auto-closed as invalid on 2021/10/20 20:50
upstream	KCSAN: data-race in complete_signal / ptrace_attach (2) kernel	6	1	2114d	2092d	0/29	auto-closed as invalid on 2020/12/21 12:01
upstream	KCSAN: data-race in complete_signal / ptrace_attach kernel	6	1	2240d	2240d	0/29	auto-closed as invalid on 2020/08/16 11:51
upstream	KCSAN: data-race in complete_signal / ptrace_attach (4) kernel	6	2	1856d	1875d	0/29	auto-closed as invalid on 2021/09/05 09:58

================================================================== BUG: KCSAN: data-race in complete_signal / ptrace_attach write to 0xffff888051e16030 of 4 bytes by task 17187 on cpu 1: ptrace_attach+0x217/0x4b0 kernel/ptrace.c:407 __do_sys_ptrace kernel/ptrace.c:1256 [inline] __se_sys_ptrace+0xc1/0x2e0 kernel/ptrace.c:1236 __x64_sys_ptrace+0x51/0x60 kernel/ptrace.c:1236 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888051e16030 of 4 bytes by task 17189 on cpu 0: complete_signal+0x455/0x5f0 kernel/signal.c:1034 __send_signal+0x666/0x780 kernel/signal.c:1181 send_signal+0x39f/0x3d0 kernel/signal.c:1242 do_send_sig_info+0x9b/0xe0 kernel/signal.c:1291 do_send_specific kernel/signal.c:3815 [inline] do_tkill kernel/signal.c:3841 [inline] __do_sys_tkill kernel/signal.c:3876 [inline] __se_sys_tkill+0x12b/0x180 kernel/signal.c:3870 __x64_sys_tkill+0x2d/0x40 kernel/signal.c:3870 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: 17189 Comm: syz-executor.3 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================