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BUG: KCSAN: data-race in do_notify_parent_cldstop / wait_consider_task

write to 0xffff88819e1da510 of 4 bytes by task 6787 on cpu 0:
 wait_task_stopped kernel/exit.c:1185 [inline]
 wait_consider_task+0xbaf/0x1a10 kernel/exit.c:1371
 ptrace_do_wait kernel/exit.c:1411 [inline]
 do_wait+0x1f4/0x640 kernel/exit.c:1518
 kernel_wait4+0x14b/0x1b0 kernel/exit.c:1677
 __do_sys_wait4 kernel/exit.c:1705 [inline]
 __se_sys_wait4 kernel/exit.c:1701 [inline]
 __x64_sys_wait4+0x90/0x120 kernel/exit.c:1701
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88819e1da510 of 4 bytes by task 6785 on cpu 1:
 do_notify_parent_cldstop+0x1b7/0x290 kernel/signal.c:2143
 ptrace_stop+0x2e2/0x670 kernel/signal.c:2287
 ptrace_do_notify kernel/signal.c:2354 [inline]
 ptrace_notify+0x107/0x180 kernel/signal.c:2364
 ptrace_report_syscall include/linux/tracehook.h:66 [inline]
 tracehook_report_syscall_entry include/linux/tracehook.h:105 [inline]
 arch_syscall_enter_tracehook include/linux/entry-common.h:98 [inline]
 syscall_trace_enter+0x87/0x290 kernel/entry/common.c:61
 __syscall_enter_from_user_work kernel/entry/common.c:90 [inline]
 syscall_enter_from_user_mode+0x1c/0x20 kernel/entry/common.c:108
 do_int80_syscall_32+0x33/0xb0 arch/x86/entry/common.c:129
 entry_INT80_compat+0x71/0x76

value changed: 0x00000005 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 6785 Comm: syz-executor.5 Tainted: G        W         5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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