-stable review patch. If anyone has any objections, please let us know.
----
From: Hugh Dickins <[EMAIL PROTECTED]>
On 4-way SMP, about one reboot in twenty hangs while killing processes:
exit needs exclusive tasklist_lock, but something still holds read_lock.
do_signal_stop race case misses unlock, and fixing it fixes the symptom.
Signed-off-by: Hugh Dickins <[EMAIL PROTECTED]>
Acked-by: Roland McGrath <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
--- 2.6.11/kernel/signal.c 2005-03-02 07:38:56.000000000 +0000
+++ linux/kernel/signal.c 2005-03-16 18:10:17.000000000 +0000
@@ -1728,6 +1728,7 @@ do_signal_stop(int signr)
* with another processor delivering a stop signal,
* then the SIGCONT that wakes us up should clear it.
*/
+ read_unlock(&tasklist_lock);
return 0;
}
-
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