From: Andrew Morton <akpm@osdl.org>
To: "Gary Funck" <gary@intrepid.com>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu
Subject: Re: 2.6.17-1.2145_FC5 mmap-related soft lockup
Date: Tue, 18 Jul 2006 21:04:58 -0700 [thread overview]
Message-ID: <20060718210458.45f9460e.akpm@osdl.org> (raw)
In-Reply-To: <200607190225.k6J2PGAq004975@intrepid.intrepid.com>
On Tue, 18 Jul 2006 19:25:16 -0700
"Gary Funck" <gary@intrepid.com> wrote:
>
> >
> > Are you able to confirm that setting CONFIG_DEBUG_SPINLOCK=n fixes it?
> >
> > And are you able to get us a copy of that test app?
>
> Yes, I just ran the test with 2.6.17.6. With CONFIG_DEBUG_SPINLOCK=y
> the test fails and the soft lockup situation often results.
> However, when built with CONFIG_DEBUG_SPINLOCK=n, the test passes,
> and runs rather quickly in comparison to when it fails.
>
> I've attached a slightly updated version of the test case.
> It is a little more carefully crafted and prints some
> output so that you have some idea that it is working.
>
That's great, thanks. That pretty much confirms that this long-standing
box-killing rwlock starvation bug is specific to Opterons. Neither Ingo
nor I have Opteron machines so a fix will take a little longer than one
would expect.
Meanwhile, an appropriate workaround is to disable CONFIG_DEBUG_SPINLOCK.
next prev parent reply other threads:[~2006-07-19 4:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-15 17:07 2.6.17-1.2145_FC5 mmap-related soft lockup Gary Funck
2006-07-16 5:19 ` Andrew Morton
2006-07-19 2:25 ` Gary Funck
2006-07-19 4:04 ` Andrew Morton [this message]
2006-07-16 6:50 ` Gary Funck
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