linux-kernel - Re: Valgrinding the kernel?

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Message-ID: <468E834E.6020906@goop.org>
Date:	Fri, 06 Jul 2007 11:00:46 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jeff Dike <jdike@...toit.com>
CC:	Dan Kegel <dank@...el.com>, linux-kernel@...r.kernel.org,
	Robert Walsh <rjwalsh@...ables.org>
Subject: Re: Valgrinding the kernel?

Jeff Dike wrote:
> Don't think so.  With what I get on FC5 (valgrind-3.1.0), I get this:
>
> ==31913== Jump to the invalid address stated on the next line
> ==31913==    at 0x9: ???
> ==31913==    by 0xBEC1599A: ???
> ==31913==    by 0x696C2F69: ???
> ==31913==  Address 0x9 is not stack'd, malloc'd or (recently) free'd
> ==31913== 
> ==31913== Process terminating with default action of signal 11 (SIGSEGV): dumping core
>
> UML is cloning a thread in order to test the host's ptrace.  However,
> it looks like valgrind is branching to 0x9 for some reason.
>   

How far into the run does this happen?  Immediately, or after a while?

> This particular bit is going to be problematic for other reasons, but
> if valgrind ever looks like it has a chance of working, I can work
> around that in UML.
>   

Hm.  I haven't touched Valgrind in a couple of years, and I suspect 
people haven't been as mean to it as I was being.  It might be time I 
gave it some love.  (I've also been thinking about porting it to be a 
Xen guest so that we can Valgrind whole virtual machines - but that's a 
different story.)

    J
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