[Bug libc/11292] New: __init_cpu_features race

["jan dot kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

ifunc resolver can be called from multiple threads at once.

./sysdeps/x86_64/multiarch/init-arch.c
struct cpu_features __cpu_features attribute_hidden;
__init_cpu_features:
          __cpu_features.family += extended_family;

This is a race, __cpu_features is global and it has no locks being held.

-- 
           Summary: __init_cpu_features race
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: minor
          Priority: P3
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: jan dot kratochvil at redhat dot com
                CC: glibc-bugs at sources dot redhat dot com
  GCC host triplet: x86_64-unknown-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=11292

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