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[PATCH 0/2] fix multi-threaded unwinding on AArch64


This patch series fixes PR 16155, a hang when unwinding in a
multi-threaded program on AArch64.

There were two bugs in gdb to be addressed here; plus a bug in glibc
that I filed as:

    https://sourceware.org/bugzilla/show_bug.cgi?id=16169

Neither patch here is actually specific to AArch64.

Built and regtested on x86-64 Fedora 18.  I also verified that I could
see the bug using a simple multi-threaded program on AArch64; and that
these patches fix the problem there.

Tom


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