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Re: valgrind support for glibc master


On Thu, 2017-06-22 at 13:14 +0200, Florian Weimer wrote:
> glibc performs a quick test run using valgrind as part of the build process.
> 
> Lately, this started crashing:
>[...]
> I think this code is fine.  Unfortunately, I don't know if I'll be able
> to get a disassembly or debug this any further.  There are a couple of
> potential causes (GLRO (dl_hwcap) is not initialized correctly in glibc,
> HWCAP_CPUID is not masked by the kernel or valgrind despite the lack of
> support, GCC schedule the volatile asm statement before the condition).
> 
> Is anyone else seeing this?
> 
> I will disable the valgrind sanity test during the Fedora build for the
> time being.

For now the auxv HWCAP is masked off on arm64 in valgrind fedora.
https://bugzilla.redhat.com/show_bug.cgi?id=1464211#c1
So you can reenable the sanity check again on fedora rawhide.

Upstream bug is https://bugs.kde.org/show_bug.cgi?id=381556
arm64: Handle feature registers access on 4.11 Linux kernel or later

Thanks,

Mark


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