On 04/26, Eric W. Biederman wrote:
>
> @@ -253,7 +252,7 @@ static int ptrace_check_attach(struct task_struct *child,
> bool ignore_state)
> */
> if (lock_task_sighand(child, &flags)) {
> if (child->ptrace && child->parent == current) {
> - WARN_ON(READ_ONCE(child->__state) == __TASK_TRACED);
> + WARN_ON(child->jobctl & JOBCTL_DELAY_WAKEKILL);
This WARN_ON() doesn't look right.
It is possible that this child was traced by another task and PTRACE_DETACH'ed,
but it didn't clear DELAY_WAKEKILL.
If the new debugger attaches and calls ptrace() before the child takes siglock
ptrace_freeze_traced() will fail, but we can hit this WARN_ON().
Oleg.
_______________________________________________
linux-um mailing list
linux-um@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-um
