==================================================================
BUG: KCSAN: data-race in ptrace_resume / wait_consider_task

write to 0xffff888133a3f508 of 4 bytes by task 28098 on cpu 1:
 ptrace_resume+0x19b/0x1c0 kernel/ptrace.c:848
 ptrace_request+0x7a2/0x1160 kernel/ptrace.c:1186
 arch_ptrace+0x57/0x230 arch/x86/kernel/ptrace.c:829
 __do_sys_ptrace kernel/ptrace.c:1271 [inline]
 __se_sys_ptrace+0xf8/0x1b0 kernel/ptrace.c:1236
 __x64_sys_ptrace+0x51/0x60 kernel/ptrace.c:1236
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888133a3f508 of 4 bytes by task 28087 on cpu 0:
 wait_task_stopped kernel/exit.c:1180 [inline]
 wait_consider_task+0xb31/0x19e0 kernel/exit.c:1371
 ptrace_do_wait kernel/exit.c:1411 [inline]
 do_wait+0x224/0x4a0 kernel/exit.c:1472
 kernel_wait4+0x13c/0x1a0 kernel/exit.c:1630
 __do_sys_wait4 kernel/exit.c:1658 [inline]
 __se_sys_wait4 kernel/exit.c:1654 [inline]
 __x64_sys_wait4+0x7a/0x100 kernel/exit.c:1654
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28087 Comm: syz-executor.0 Tainted: G        W         5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================