[Bug translator/9773] New: On x86_64, systemtap sometimes fails to retrieve a local variable

[srikar at linux dot vnet dot ibm dot com]

On a fedora machine running 2.6.23 kernel systemtap fails to retreive a local
variable of a non-inline function.  This only happens on a x86_64 machine.
Not faced the same problem on a i686 machine, 

# grep aio_complete /proc/kallsyms 
ffffffff810b25c2 T aio_complete
ffffffff8134f260 r __ksymtab_aio_complete
ffffffff8135e51f r __kstrtab_aio_complete

#  cat /tmp/a.stp 
probe kernel.statement("aio_complete@fs/aio.c:1012")
{
        printf("%d %d\n", $ring->head, $ring->tail)
}



selected source file 'fs/aio.c'
selected function aio_complete
probe aio_complete@fs/aio.c:1012 kernel section=.text pc=0xffffffff810b27bf
finding location for local 'ring' near address ffffffff810b27bf, module bias 0
finding location for local 'ring' near address ffffffff810b27bf, module bias 0
Eliding side-effect-free singleton block operator '{' at /tmp/a.stp:2:1
Resolution problem with probe probe_1383
printf("%d %d\\n", $ring->head, $ring->tail)
semantic error: failed to retrieve location attribute for local 'ring'
(dieoffset: 0x7f1a26): identifier '$ring' at /tmp/a.stp:3:27
Pass 2: analyzed script: 1 probe(s), 0 function(s), 0 embed(s), 0 global(s) in
80usr/40sys/122real ms.
Pass 2: analysis failed.  Try again with more '-v' (verbose) options.
Running rm -rf /tmp/stapJoPSXo


# /usr/local/bin/stap  -V
SystemTap translator/driver (version 0.8/0.137 non-git sources)
Copyright (C) 2005-2008 Red Hat, Inc. and others
This is free software; see the source for copying conditions.

# cat ../SNAPSHOT 
1c1de83d57f78c7d3f38c1e40ebabf1a286c3b04
#
 
I have seen this problem with older version of systemtap and elfutils too.

-- 
           Summary: On x86_64, systemtap sometimes fails to retrieve a local
                    variable
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: srikar at linux dot vnet dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=9773

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