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SubjectRe: [PATCH] notify_parent and ptrace cleanup
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Roland McGrath <roland@redhat.com> writes:

> + spin_unlock_irq(&current->sighand->siglock);

This unlock is odd. lock is missing?

> + read_lock(&tasklist_lock);
> + do_notify_parent_cldstop(current, current->parent);
> + read_unlock(&tasklist_lock);
> + schedule();
> +
> + /* We are back. */
> + current->last_siginfo = NULL;
> +}

->last_siginfo is racy. Please, really please don't extend it until
the race condition is fixed.

SIGCONT restart the stopped task. Any lock doesn't prevent it.
--
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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