| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1218721740.10800.230.camel@twins> Date: Thu, 14 Aug 2008 15:49:00 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Ingo Molnar <mingo@...e.hu>, Alex Nixon <alex.nixon@...rix.com> Cc: linux-kernel <linux-kernel@...r.kernel.org> Subject: [PATCH] sched: fix rt-bandwidth hotplug race Subject: sched: fix rt-bandwidth hotplug race From: Peter Zijlstra <a.p.zijlstra@...llo.nl> Date: Thu Aug 14 15:42:44 CEST 2008 When we hot-unplug a cpu and rebuild the sched-domain, all cpus will be detatched. Alex observed the case where a runqueue was stealing bandwidth from an already disabled runqueue to satisfy its own needs. Stop this by skipping over already disabled runqueues. Reported-by: Alex Nixon <alex.nixon@...rix.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl> Tested-by: Alex Nixon <alex.nixon@...rix.com> --- kernel/sched_rt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6/kernel/sched_rt.c =================================================================== --- linux-2.6.orig/kernel/sched_rt.c +++ linux-2.6/kernel/sched_rt.c @@ -298,7 +298,7 @@ static void __disable_runtime(struct rq struct rt_rq *iter = sched_rt_period_rt_rq(rt_b, i); s64 diff; - if (iter == rt_rq) + if (iter == rt_rq || iter->rt_runtime == RUNTIME_INF) continue; spin_lock(&iter->rt_runtime_lock); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists