From: swarren@wwwdotorg.org (Stephen Warren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/1] Fix segfault in DTC
Date: Sun, 30 Sep 2012 23:34:50 -0600 [thread overview]
Message-ID: <50692B7A.8000405@wwwdotorg.org> (raw)
In-Reply-To: <20120929235342.GA23078@truffula.fritz.box>
On 09/29/2012 05:53 PM, David Gibson wrote:
> On Fri, Sep 28, 2012 at 01:05:33PM -0600, Stephen Warren wrote:
>> On 09/28/2012 12:53 PM, Jon Loeliger wrote:
>>>>>
>>>>> Yeah, seems like the kernel DTC is quite old.
>>>>
>>>> FYI, I'm working on a patch to the kernel to bring in the latest dtc.
>>>
>>> Awesome. Thank you.
>>>
>>>> I've run a regression test vs. the old dtc in the kernel ...
>>>
>>> Which is the icky step. Again, thank you.
>>>
>>>> ... and found that
>>>> some of the PowerPC .dts files don't compile with the new dtc (but did
>>>> with the old), all due to non-existent labels/paths being referenced.
>>>> I'll try and track down whether this is a regression in dtc, or simply
>>>> buggy .dts files that weren't noticed before.
>>>
>>> I think you should just smack the PowerPC guys. :-)
>>
>> For the record in this thread, it was a regression I introduced into dtc
>> - the patch I just sent was for this.
>
> I would be nice to add a testcase for this regression into dtc.
The issue here was caused by uninitialized memory, so it would, I think,
be basically impossible to create a test-case that would be guaranteed
to fail because of this; it'd depend on the internal details of the
malloc library and how/when it re-used previously free()d memory blocks.
WARNING: multiple messages have this Message-ID (diff)
From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
To: David Gibson <david-xT8FGy+AXnRB3Ne2BGzF6laj5H9X9Tb+@public.gmane.org>
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH 1/1] Fix segfault in DTC
Date: Sun, 30 Sep 2012 23:34:50 -0600 [thread overview]
Message-ID: <50692B7A.8000405@wwwdotorg.org> (raw)
In-Reply-To: <20120929235342.GA23078-W9XWwYn+TF0XU02nzanrWNbf9cGiqdzd@public.gmane.org>
On 09/29/2012 05:53 PM, David Gibson wrote:
> On Fri, Sep 28, 2012 at 01:05:33PM -0600, Stephen Warren wrote:
>> On 09/28/2012 12:53 PM, Jon Loeliger wrote:
>>>>>
>>>>> Yeah, seems like the kernel DTC is quite old.
>>>>
>>>> FYI, I'm working on a patch to the kernel to bring in the latest dtc.
>>>
>>> Awesome. Thank you.
>>>
>>>> I've run a regression test vs. the old dtc in the kernel ...
>>>
>>> Which is the icky step. Again, thank you.
>>>
>>>> ... and found that
>>>> some of the PowerPC .dts files don't compile with the new dtc (but did
>>>> with the old), all due to non-existent labels/paths being referenced.
>>>> I'll try and track down whether this is a regression in dtc, or simply
>>>> buggy .dts files that weren't noticed before.
>>>
>>> I think you should just smack the PowerPC guys. :-)
>>
>> For the record in this thread, it was a regression I introduced into dtc
>> - the patch I just sent was for this.
>
> I would be nice to add a testcase for this regression into dtc.
The issue here was caused by uninitialized memory, so it would, I think,
be basically impossible to create a test-case that would be guaranteed
to fail because of this; it'd depend on the internal details of the
malloc library and how/when it re-used previously free()d memory blocks.
next prev parent reply other threads:[~2012-10-01 5:34 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-24 22:48 [PATCH 0/1] Fix segfault in DTC Markus Mayer
2012-09-24 22:48 ` [PATCH 1/1] " Markus Mayer
2012-09-25 11:07 ` [PATCH 0/1] " Will Deacon
2012-09-25 15:44 ` Stephen Warren
2012-09-25 16:42 ` Markus Mayer
2012-09-25 17:58 ` Markus Mayer
2012-09-25 17:58 ` Markus Mayer
2012-09-25 17:58 ` [PATCH 1/1] " Markus Mayer
2012-09-25 17:58 ` Markus Mayer
2012-09-25 23:30 ` David Gibson
2012-09-25 23:30 ` David Gibson
2012-09-25 23:51 ` Markus Mayer
2012-09-25 23:51 ` Markus Mayer
2012-09-26 0:35 ` David Gibson
2012-09-26 0:35 ` David Gibson
2012-09-26 16:38 ` Markus Mayer
2012-09-26 16:38 ` Markus Mayer
2012-09-28 17:09 ` Stephen Warren
2012-09-28 17:09 ` Stephen Warren
2012-09-28 18:53 ` Jon Loeliger
2012-09-28 18:53 ` Jon Loeliger
2012-09-28 19:05 ` Stephen Warren
2012-09-28 19:05 ` Stephen Warren
2012-09-28 20:32 ` Jon Loeliger
2012-09-28 20:32 ` Jon Loeliger
2012-09-29 23:53 ` David Gibson
2012-09-29 23:53 ` David Gibson
2012-10-01 5:34 ` Stephen Warren [this message]
2012-10-01 5:34 ` Stephen Warren
2012-10-01 6:46 ` David Gibson
2012-10-01 6:46 ` David Gibson
2012-10-01 16:41 ` Stephen Warren
2012-10-01 16:41 ` Stephen Warren
2012-10-02 0:08 ` David Gibson
2012-10-02 0:08 ` David Gibson
2012-10-03 21:33 ` Stephen Warren
2012-10-03 21:33 ` Stephen Warren
2012-10-04 4:49 ` David Gibson
2012-10-04 4:49 ` David Gibson
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