Re: libc recently more aggressive about pthread locks in stable ?
On Sun, 06 Nov 2016, Ben Hutchings wrote:
> It's worth noting that TSX is broken in 'Haswell' processors and is
> supposed to be disabled via a microcode update. I don't know whether
> glibc avoids using it on these processors if the microcode update is
> not applied. (Linux doesn't appear to hide the feature flags.)
It does avoid it. For glibc libpthreads, Debian has blacklisted Intel
TSX use [in libpthreads] on all of Haswell and much of Broadwell.
But anything else *will* attempt to use it, people query cpuid directly
for these things. You need a hypervisor that filters cpuid().
--
Henrique Holschuh
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