Description of problem:
When trying to look at local variables (or function parameters), gdb gives me
"Cannot access memory at address 0x<garbage><yyyyyyyy>", where <yyyyyyyy> would
be the correct address.


Version-Release number of selected component (if applicable):
GNU gdb Red Hat Linux (6.3.0.0-1.122rh)
This GDB was configured as "x86_64-redhat-linux-gnu"...Using host libthread_db
library "/lib64/libthread_db.so.1".


How reproducible:
Always when showing stack traces for programs built with -gstabs+ or -gstabs.


Steps to Reproduce:
1. Build the attached test program with "gcc -gstabs+ test.c"
2. gdb ./a.out
3. br a
4. r
  
Actual results:
Breakpoint 1, a (x=Cannot access memory at address 0x8000ffd85118
) at test.c:3


Expected results:
Breakpoint 1, a (x=<some address close to 0xffd85118>
) at test.c:3

Additional info:
The production case which bugs me looks like this (the value 0x00000001 in the
upper 32 bits):

#0  vtex_breakpoint () at VTXMLMessages/CLS_XMLMessages.cpp:268
#1  0x000000000066366b in VTException::VTException (this=Cannot access memory at
address 0x143202f28
) at VTXMLMessages/CLS_XMLMessages.cpp:445
#2  0x0000000000415869 in VTE_TP<AnsiString> (xc=Cannot access memory at address
0x14320335c
) at VTCOM/../VTXMLMessages/CLS_XMLMessages.h:118
#3  0x000000000053478c in network_error () at VTCOM/CLS_VTCOMUnix.cpp:34
#4  0x0000000000536bdf in VTCOMUnixSocketAdaptor::next (this=Cannot access
memory at address 0x1432038b8
) at VTCOM/CLS_VTCOMUnix.cpp:121
#5  0x00000000005348fc in VTCOMUnixSocketAdaptor::ReceiveString (this=Cannot
access memory at address 0x143203948
) at VTCOM/CLS_VTCOMUnix.cpp:170
#6  0x000000000052fb5f in VTCOMMarshaller::ReadFromSocket (this=Cannot access
memory at address 0x1432039e8
) at VTCOM/CLS_VTCOM.cpp:218
#7  0x0000000000532dc9 in VTCOM::GetNextRequest (s=Cannot access memory at
address 0x143203ad8
) at VTCOM/CLS_VTCOMServer.cpp:136
#8  0x0000000000532ea2 in VTCOM::ServerRequestLoop (s=Cannot access memory at
address 0x143203b50
) at VTCOM/CLS_VTCOMServer.cpp:157
[...]