RE: PAE causing failure to run various executables.

[Pallipadi, Venkatesh]

>-----Original Message-----
>From: linux-kernel-owner@xxxxxxxxxxxxxxx 
>[mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] On Behalf Of avi
>Sent: Wednesday, October 05, 2005 2:32 PM
>To: Dave Jones
>Cc: linux-kernel@xxxxxxxxxxxxxxx
>Subject: Re: PAE causing failure to run various executables.
>
>Dave Jones wrote:
>
>>A fedora user recently filed a puzzling bug at
>>https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169741
>>
>>The system being reported has exactly 4GB, and its E820
>>tables seem to concur that there is in fact 4GB.
>>
>>When run in non-PAE mode, it triggers the
>>"Warning only 4GB will be used. Use a PAE enabled kernel."
>>message, which is odd, but the system does actually run.
>>
>>When run in PAE mode, it seems to lose its mind, and it
>>fails to run various binaries.
>>
>>Booting with mem=4G causes the machine to boot fine
>>(though for some reason, it finds only 3042M of RAM).
>>
>>  
>>
>looks like a 1GB hole.

Yes. E820 map here indeed shows 1GB of memory at higher than 32 bits
range.


>
>>The reporter of this bug has tested on 2.6.14-rc3-git4, and found the
>>same issue exists as he saw on the original FC3 kernel, thus 
>ruling out
>>any Fedora-specific patches.
>>
>>Anyone have any ideas what's wrong here?
>>
>>		
>>
>maybe the last 1GB is bad. since it can only be accessed by pae, only 
>the pae kernel fails.
>

Another possible reason can be NX(Execute Disable) support, which is 
active only on a PAE kernel. Trying "noexec=off" on a PAE kernel can be
tried here.

Thanks,
Venki
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