[Bug translator/11814] New: build-id offset calculations missing relocation for some .ko

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

tonyj @ suse reports a case where translator.cxx appears to emit
incorrect buildid-offset values into stap-symbols.h, which leads
to verification errors & aborted scripts.

 honeydew:/sys/module/libata/sections/:[0]# grep .
/sys/module/libata/sections/.??* | sort
 /sys/module/libata/sections/.bss:0xd000000000c7c918
 /sys/module/libata/sections/.data.rel.ro:0xd000000000c67370
 /sys/module/libata/sections/.data.rel:0xd000000000c79718
 /sys/module/libata/sections/.data:0xd000000000c67268
 /sys/module/libata/sections/.exit.text:0xd000000000c5d2fc
 /sys/module/libata/sections/.gnu.linkonce.this_module:0xd000000000c7c6d8
 /sys/module/libata/sections/.note.gnu.build-id:0xd000000000c67244
 /sys/module/libata/sections/.opd:0xd000000000c7a788
 /sys/module/libata/sections/.rodata.str1.8:0xd000000000c62e20
 /sys/module/libata/sections/.rodata:0xd000000000c607e8
 /sys/module/libata/sections/.strtab:0xd000000000cb9a50
 /sys/module/libata/sections/.stubs:0xd000000000c5d8d8
 /sys/module/libata/sections/.symtab:0xd000000000cb0000
 /sys/module/libata/sections/.text:0xd000000000c40000
 /sys/module/libata/sections/.toc1:0xd000000000c79a68
 /sys/module/libata/sections/.toc:0xd000000000c7c6a8

the buildid-offset should be on the order of a few dozen, since runtime/sym.c
properly relocates .ko buildids against the .notes section base.  However,
stap was found to emit ...

tonyj Found build-id in libata, length 20, end at 0x87d7c
tonyj build_id_offset = 0x87d7c - 0x4bd00= 0x3c07c

It appears as if translate.cxx:5384, the XXX section related to build_id_offset
calculation, is neglecting to perform elfutils relocation on the incoming
vaddr for .ko files.
 
There is no theory yet as to why only some .ko's are manifesting this problem.

-- 
           Summary: build-id offset calculations missing relocation for some
                    .ko
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11814

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