[Bug backends/21541] New: eu-readelf --notes fails to dump PRSTATUS data?

[myocytebd at sina dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21541

Bug ID: 21541
   Summary: eu-readelf --notes fails to dump PRSTATUS data?
   Product: elfutils
   Version: unspecified
Status: UNCONFIRMED
  Severity: normal
  Priority: P2
 Component: backends
  Assignee: unassigned at sourceware dot org
  Reporter: myocytebd at sina dot com
CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Created attachment 10081
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10081&action=edit
The core file mentioned

Version: latest master
 I built elfutils with --prefix with a non-default path.
 Native build on x64.

Problem: Run eu-readelf --notes core.dump
 The core-dump is generated from a x64 program.
 A. The one I built cannot dump details PRSTATUS data.
 B. On another machine, distribution shipped elfutils-0.158 dumps 
details of PRSTATUS data for the same core-dump.

I have no glue where it is wrong. (Or the core file is broken?)
There seems to be no relevant configure options.
At runtime eu-readelf doesn't tell why it does not dump details of PRSTATUS.

config report:
=
elfutils: 0.169 (eu_version: 169)
=

Prefix : /home/xxx/ins
Program prefix ("eu-" recommended) : eu-
Source code location   : .
Maintainer mode: 
libebl modules subdirectory: elfutils
build arch : x86_64-unknown-linux-gnu

  RECOMMENDED FEATURES (should all be yes)
gzip support   : yes
bzip2 support  : yes
lzma/xz support: yes
libstdc++ demangle support : yes
File textrel check : yes
Symbol versioning  : yes

  NOT RECOMMENDED FEATURES (should all be no)
Experimental thread safety : no

  OTHER FEATURES
Deterministic archives by default  : false
Native language support: yes

  EXTRA TEST FEATURES (used with make check)
have bunzip2 installed (required)  : yes
debug branch prediction: no
gprof support  : no
gcov support   : no
run all tests under valgrind   : no
gcc undefined behaviour sanitizer  : no
use rpath in tests : no
test biarch: no

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[Bug backends/21541] eu-readelf --notes fails to dump PRSTATUS data?

[myocytebd at sina dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21541

--- Comment #2 from myocytebd at sina dot com ---
(In reply to Mark Wielaard from comment #1)
> Since you are installing in a non-standard location make sure PATH and
> LD_LIBRARY_PATH are setup correctly so the correct version of the binaries,
> libraries and backends are picked up.
> 
> In your case it should probably be
> export PATH=/home/xxx/ins/bin:$PATH
> export LD_LIBRARY_PATH=/home/xxx/ins/lib:/home/xxx/ins/lib/elfutils

I checked that it is using the correct libdw/libelf.
I patched rpath of eu-readelf(In reply to Mark Wielaard from comment #1)
> Since you are installing in a non-standard location make sure PATH and
> LD_LIBRARY_PATH are setup correctly so the correct version of the binaries,
> libraries and backends are picked up.
> 
> In your case it should probably be
> export PATH=/home/xxx/ins/bin:$PATH
> export LD_LIBRARY_PATH=/home/xxx/ins/lib:/home/xxx/ins/lib/elfutils

Thanks.
/home/xxx/ins/lib/elfutils => This is the problem.

I looked at: libebl/eblopenbackend.c,
and found openbackend() implementation surprising:
1. It doesn't try relative path from the executable.
2. It doesn't try the path from --prefix.
3. When it failed to load, it doesn't print any message.

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