From: Chris Wright <chrisw@osdl.org>
To: linux-kernel@vger.kernel.org, stable@kernel.org
Cc: hugh@veritas.com, roland@redhat.com, torvalds@osdl.org,
akpm@osdl.org, alan@lxorguk.ukuu.org.uk, jmforbes@linuxtx.org,
zwane@arm.linux.org.uk, cliffw@osdl.org, tytso@mit.edu,
rddunlap@osdl.org
Subject: [6/9] tasklist left locked
Date: Wed, 16 Mar 2005 15:55:26 -0800 [thread overview]
Message-ID: <20050316235526.GE5389@shell0.pdx.osdl.net> (raw)
In-Reply-To: <20050316235336.GY5389@shell0.pdx.osdl.net>
-stable review patch. If anyone has any objections, please let us know.
----
From: Hugh Dickins <hugh@veritas.com>
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 <hugh@veritas.com>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Chris Wright <chrisw@osdl.org>
--- 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;
}
next prev parent reply other threads:[~2005-03-17 0:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-16 23:53 [0/9] -stable review Chris Wright
2005-03-16 23:54 ` [1/9] [ALSA] Fix stereo mutes on Surround volume control Chris Wright
2005-03-16 23:54 ` [2/9] Possible AMD8111e free irq issue Chris Wright
2005-03-17 0:19 ` Ian Pilcher
2005-03-17 1:03 ` Chris Wright
2005-03-17 1:13 ` Ian Pilcher
2005-03-17 2:00 ` Jeff Garzik
2005-03-16 23:54 ` [3/9] [IPSEC]: Fix __xfrm_find_acq_byseq() Chris Wright
2005-03-16 23:54 ` [4/9] NetROM locking Chris Wright
2005-03-16 23:55 ` [5/9] [TUN] Fix check for underflow Chris Wright
2005-03-17 0:13 ` Patrick McHardy
2005-03-17 0:23 ` Chris Wright
2005-03-16 23:55 ` Chris Wright [this message]
2005-03-16 23:55 ` [7/9] Timercode race in AX.25 Chris Wright
2005-03-16 23:55 ` [8/9] Possible VIA-Rhine free irq issue Chris Wright
2005-03-16 23:55 ` [9/9] Fix kernel panic on receive with WAN Hitachi SCA HD6457x Chris Wright
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