linux-kernel - RE: [2.6.25-rc5-mm1][regression] ia64: hackbench doesn't finish >12 hour

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 4 Apr 2008 16:52:29 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
Cc:	"LKML" <linux-kernel@...r.kernel.org>,
	<linux-ia64@...r.kernel.org>,
	"Hidetoshi Seto" <seto.hidetoshi@...fujitsu.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: RE: [2.6.25-rc5-mm1][regression] ia64: hackbench doesn't finish >12 hour

> We can reproduce the soft lockup issue now and root cause the issue as
well.
>
> Since the ptc.g patch uses semaphore ptcg_sem to serialize multiple
> ptc.g instructions in ia64_global_tlb_purge(). This requires the code
> path should be safe to sleep in down(). But the code path can not
> sleep during swap because it holds some spin locks (e.g.
anon_vma_lock).
> Going to sleep finally causes soft lockup.

I've just pushed a new version of this patch into my test tree (so
it will show up in -mm and linux-next when they pull and rebuild).
It now uses the Piggin/Wilcox "spinaphore" primitives.  It passes
all my tests, and some runs of "hackbench" that tried to match the
tests that failed before at Fujitsu by forcing moderate amounts of
swapping.

-Tony
--
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/