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
