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Subject[patch] wait4-fix-2.5.34-B2, BK-curr

the attached patch (ontop of the previous exit.c patch) fixes a number of
bugs that broke ptrace:

- wait4 must not inhibit TASK_STOPPED processes even for thread group
leaders.

- do_notify_parent() should not delay the notification of parents if
the thread in question is ptraced.

strace now works as expected for CLONE_THREAD applications as well.

Ingo

--- linux/kernel/signal.c.orig Sun Sep 15 14:24:21 2002
+++ linux/kernel/signal.c Sun Sep 15 14:36:43 2002
@@ -1105,7 +1105,7 @@
struct siginfo info;
int why, status;

- if (delay_group_leader(tsk))
+ if (!tsk->ptrace && delay_group_leader(tsk))
return;
if (sig == -1)
BUG();
--- linux/kernel/exit.c.orig Sun Sep 15 14:10:07 2002
+++ linux/kernel/exit.c Sun Sep 15 14:10:38 2002
@@ -770,11 +770,6 @@
if (!ret)
continue;
flag = 1;
- /*
- * Eligible but we cannot release it yet:
- */
- if (ret == 2)
- continue;

switch (p->state) {
case TASK_STOPPED:
@@ -798,6 +793,11 @@
}
goto end_wait4;
case TASK_ZOMBIE:
+ /*
+ * Eligible but we cannot release it yet:
+ */
+ if (ret == 2)
+ continue;
read_unlock(&tasklist_lock);
retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
if (!retval && stat_addr) {
-
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