syzbot

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BUG: KCSAN: data-race in ptrace_resume / wait_consider_task

write to 0xffff88814103a490 of 4 bytes by task 422 on cpu 1:
 ptrace_resume+0x19b/0x1c0 kernel/ptrace.c:883
 ptrace_request+0x8d0/0x12e0
 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_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 0xffff88814103a490 of 4 bytes by task 412 on cpu 0:
 wait_task_stopped kernel/exit.c:1180 [inline]
 wait_consider_task+0xb5c/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

value changed: 0x0000002c -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 412 Comm: syz-executor.1 Not tainted 5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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