patchelf breaks this Linux shared library

[pkgw]

When I run patchelf --set-rpath '$ORIGIN' libgomp.so.1 (Git master) on this particular shared library:

http://newton.cx/~peter/files/libgomp.so.1 (86 K)

it does not report an error, but it apparently breaks the file. For instance, ldd libgomp.so.1 then reports "not a dynamic executable", and in one case loading the library yields an error of "failed to map segment from shared object".

There's probably something about this particular file where modifying the RPATH entry is not feasible, but in that case patchelf should exit with an error rather than breaking the file.

[darealshinji]

This doesn't happen with Ubuntu's libgomp.so.1 so there's something about your library version that patchelf can't handle properly.
Here's the output of readelf -e libgomp.so.1: https://gist.github.com/darealshinji/40f8b34872bbb88feaf6
The first file is your libgomp.so.1, the second is from Ubuntu 14.04. Maybe that helps to find the error.

[pkgw]

Well, I don't know anything about the ELF format, really. Probably the best way to find the error is to trace what patchelf is doing ... it must be overwriting an incorrect part of the file somehow, right?

There are a bunch of differences between the readelf outputs, but one that I noticed was that "Einstiegspunktadresse" is 0x3770 in the Ubuntu file and 0x3e7a804190 in my version ... those are pretty different values!

[edolstra]

http://newton.cx/~peter/files/libgomp.so.1 gives a 404 BTW.

[pkgw]

Whoops, I forgot that I needed to preserve that file! It's back up again.

[darealshinji]

@pkgw I didn't realize that the output was still set to German. I've updated the files: https://gist.github.com/darealshinji/40f8b34872bbb88feaf6

[darealshinji]

When there is not enough space left in the ELF's header to add or modify an entry then all the entries will be copied to the end of the file. Maybe that's causing the problems.

[probonopd]

How can we best debug this systematically?

[probonopd]

Similar to/same as #99?

[domenkozar]

Closing as inactive.