[syslinux] [PATCH] Fix for crash with certain EFIs

Chris Dragan chris at chris.dragan.name
Wed Oct 19 01:37:44 PDT 2016

Hi Ady,

Would it work if we removed "ifdef EFI_BUILD" condition and just add
-mno-red-zone for all x86_64 builds? If not, do you have any ideas how
to pass this flag?

This could work, because the patch is adding the -mno-red-zone flag
only for x86_64 builds, which are only used in the form of the efi64
target. The efi32 and bios targets are both 32-bit.

BTW. I also tried 6.04-pre1 and top of tree on the systems where the
problem occurs and syslinux would crash, unless it was rebuilt with
the -mno-red-zone flag.

Best Regards,
- Chris

On Tue, Oct 18, 2016 at 9:14 PM, Ady Ady via Syslinux
<syslinux at zytor.com> wrote:
>> Thank you very much for this, I have been running into this issue a number
>> of times but could never get a firm grip on it.
>> Especially HP Gen9 proliants seem to suffer from it by sometimes throwing a
>> stack dump very early in the boot. In the past we worked around it by
>> forcing bios boot.
>> After rebuilding it with -mno-red-zone the problem appears to be fixed, at
>> least after a couple of hours of testing I have not seen it anymore.
> Have you tried 6.04-pre1 or later? With pre-built binaries?
> Would you please clarify? Are you saying that 6.04-pre1 is failing too,
> but building 6.03 with this proposed patch is working correctly?
> Regards,
> Ady.
> PS: In my previous email I wrote "2016Nov"; of course I meant 2015Nov.
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