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[Bug translator/20288] New: dwfl/elfutils problem when gathering line-record data for *symfile/*symline functions

https://sourceware.org/bugzilla/show_bug.cgi?id=20288

            Bug ID: 20288
           Summary: dwfl/elfutils problem when gathering line-record data
                    for *symfile/*symline functions
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

random git stap build running against f22

% ./stap -V
Systemtap translator/driver (version 3.1/0.166, commit
release-3.0-110-g713029398d38 + changes)

% ./stap -p4 -e 'probe process("/bin/ls").function("main") { log(usymfile(0))
}' --vp 0044
[...]
dump_unwindsyms /usr/bin/ls index=2 base=0x400000
Found build-id in /usr/bin/ls, length 20, start at 0x400284
WARNING: No debug line data for /usr/bin/ls, no error
[...]

wait, wha?

% rpm -qf /usr/bin/ls
coreutils-8.23-11.fc22.x86_64
% rpm -q coreutils-debuginfo
coreutils-debuginfo-8.23-11.fc22.x86_64

% readelf -S /usr/lib/debug/usr/bin/ls.debug | grep -A1 debug.line
  [31] .debug_line       PROGBITS         0000000000000000  00017bc3
       0000000000006668  0000000000000000           0     0     1

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