[Bug libc/19490] New: Some asm functions lack unwind descriptors

["ppluzhnikov at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19490

            Bug ID: 19490
           Summary: Some asm functions lack unwind descriptors
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: ppluzhnikov at google dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Current trunk GLIBC build on x86_64 does not have unwind descriptors for:

libc.so.6:

00000000000e7180 T __fentry__
00000000000e7120 T _mcount

libpthread.so.0:
000000000000d700 T pthread_cond_signal
000000000000d7e0 T pthread_cond_broadcast
000000000000dbe0 T pthread_spin_lock
000000000000dc00 T pthread_spin_trylock
000000000000dc20 T pthread_spin_init
000000000000dc20 T pthread_spin_unlock

A patch to fix the last 4:
https://sourceware.org/ml/libc-alpha/2016-01/msg00431.html

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