[Bug libc/6389] New: unwind information for x86 vfork is incorrect

["drow at sources dot redhat dot com" <sourceware-bugzilla at sourceware dot org>]

The CFI in sysdeps/unix/sysv/linux/i386/vfork.S records that the stack was
popped but leaves the eip saved on the stack.  After the vfork, while the child
is running but the parent is still on the syscall, that stack location is
reused.  A breakpoint one instruction past the int $0x80 will have a bad stack
trace.

-- 
           Summary: unwind information for x86 vfork is incorrect
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: drow at sources dot redhat dot com
                CC: glibc-bugs at sources dot redhat dot com
  GCC host triplet: i686-linux


http://sourceware.org/bugzilla/show_bug.cgi?id=6389

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