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Date: Thu, 16 Oct 2008 12:02:00 -0000
From: "prerna at linux dot vnet dot ibm dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sources.redhat.com
Message-ID: <20081016120115.6963.prerna@linux.vnet.ibm.com>
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Subject: [Bug translator/6963] New: Bug in elfutils-0.137 causing failure in lookup of kernel global variables
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The following script runs successfully on ppc64 when compiled with
elfutils-0.135 but fails on ppc64 with elfutils-0.137

probe kernel.function("__vm_enough_memory")
{
        printf("sysctl_overcommit_ratio = %d\n", $sysctl_overcommit_ratio)
}

The stack backtrace for the failure :

#0  0x1fbb10a0 in raise () from /lib/libc.so.6
#1  0x1fbb2e04 in abort () from /lib/libc.so.6
#2  0x1fbf2a24 in __libc_message () from /lib/libc.so.6
#3  0x1fbfece4 in _int_realloc () from /lib/libc.so.6
#4  0x1fc012c0 in realloc () from /lib/libc.so.6
#5  0x1ffc3a24 in insert (dwfl=0x20873710, i=20, start=2157856, 
    end=13835058055282163712, segndx=-1)
    at /root/prerna/elfutils-0.137/libdwfl/segment.c:80
#6  0x1ffc4280 in dwfl_addrsegment (dwfl=0x20873710, 
    address=13835058055289295728, mod=0xffc660d8)
    at /root/prerna/elfutils-0.137/libdwfl/segment.c:179
#7  0x1ffc9d84 in dwfl_addrmodule (dwfl=<value optimized out>, 
    address=25769803784)
    at /root/prerna/elfutils-0.137/libdwfl/dwfl_addrmodule.c:56
#8  0x200cf550 in dwflpp::emit_address (this=0x208735e0, 
    pool=<value optimized out>, address=13835058055282163720)
    at tapsets.cxx:1573
#9  0x200cfb70 in dwflpp::loc2c_emit_address (arg=<value optimized out>, 
    pool=<value optimized out>, address=25769803784) at tapsets.cxx:1625
-------------------------------------------------------------------------
Looks like an issue with dwfl_addrmodule.c

( I'm labelling this as a translator bug since I couldnt find a separate section
for elfutils-bugs )

-- 
           Summary: Bug in elfutils-0.137 causing failure in lookup of
                    kernel global variables
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: prerna at linux dot vnet dot ibm dot com
                CC: roland at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=6963

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