linux-kernel - Re: [Regression] Crash in load

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Message-Id: <201005260054.52122.rjw@sisk.pl>
Date:	Wed, 26 May 2010 00:54:52 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Brandon Philips <brandon@...p.org>
Subject: Re: [Regression] Crash in load_module() while freeing args

On Tuesday 25 May 2010, Rafael J. Wysocki wrote:
> Hi,
> 
> Recent -git kernels crash for me quite often during boot, reporting that kernel
> paging request could not be satisfied at load_module+0x18e4, which
> corresponds to line 2483 of kernel/module.c for the kernel in question (however
> the same call trace says IP is at precpu_modfree+0x1 at the moment of the
> crash, which seems to point to line 2481 of the same file).  It doesn't happen
> every time, but it does happen often enough to be annoying and the call
> trace is always exactly the same.
> 
> I'm going to revert post-2.6.34 commits that touch kernel/module.c directly
> and see what happens.

I'm not able to reproduce the issue with the following commit reverted:

commit 480b02df3aa9f07d1c7df0cd8be7a5ca73893455
Author: Rusty Russell <rusty@...tcorp.com.au>
Date:   Wed May 19 17:33:39 2010 -0600

    module: drop the lock while waiting for module to complete initialization.

Thanks,
Rafael
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