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BUG: KCSAN: data-race in ptrace_resume / wait_consider_task

write to 0xffff88813ce3d4c8 of 4 bytes by task 22536 on cpu 0:
 ptrace_resume+0x19b/0x1c0 kernel/ptrace.c:883
 ptrace_request+0x84f/0x1210 kernel/ptrace.c:1221
 arch_ptrace+0x57/0x230 arch/x86/kernel/ptrace.c:829
 __do_sys_ptrace kernel/ptrace.c:1312 [inline]
 __se_sys_ptrace+0xf8/0x1b0 kernel/ptrace.c:1277
 __x64_sys_ptrace+0x51/0x60 kernel/ptrace.c:1277
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813ce3d4c8 of 4 bytes by task 22527 on cpu 1:
 wait_task_stopped kernel/exit.c:1181 [inline]
 wait_consider_task+0xb31/0x19e0 kernel/exit.c:1372
 ptrace_do_wait kernel/exit.c:1412 [inline]
 do_wait+0x244/0x6b0 kernel/exit.c:1519
 kernel_wait4+0x13c/0x1a0 kernel/exit.c:1678
 __do_sys_wait4 kernel/exit.c:1706 [inline]
 __se_sys_wait4 kernel/exit.c:1702 [inline]
 __x64_sys_wait4+0x7a/0x100 kernel/exit.c:1702
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000003d -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22527 Comm: syz-executor.1 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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