linux-kernel - RE: 2.6.17-1.2145_FC5 mmap-related soft lockup

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Date:	Tue, 18 Jul 2006 19:25:16 -0700
From:	"Gary Funck" <gary@...repid.com>
To:	"'Andrew Morton'" <akpm@...l.org>
Cc:	<linux-kernel@...r.kernel.org>, "'Ingo Molnar'" <mingo@...e.hu>
Subject: RE: 2.6.17-1.2145_FC5 mmap-related soft lockup

> 
> 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.

Download attachment "mmap_soft_lockup_x86_64.c" of type "application/octet-stream" (4039 bytes)