I came across this while working on the ubuntu-image snap, and have
narrowed down the root cause a bit further. In the ubuntu-image snap,
`du` was experiencing a segmentation fault because the RPATH was not set
by snapcraft's patchelf.
In snapcraft/internal/elf.py (func _dtermine_libraries) the logic for
setting up the patchelf command is:
```
try an ldd command
if <command failed>
try the same ldd command with LD_PRELOAD
if <second command succeeded>
use patchelf to set the interpreter of the binary
if <second command failed>
try a new ldd command with LD_TRACE_LOADED_OBJECTS
if <third command succeeded>
use patchelf to set the interpreter and rpath of the binary
if <third command failed>
return error
```
This logic leads to inconsistent patchelf commands being constructed
based on the environment in which they are tried. In my example, I found
that I had two different lxc containers, both 18.04, in which different
patchelf commands were being executed on many of the binaries found in
the coreutils package. I eventually traced it back to the environment
variable "SHELL=" in one of the containers. SHELL being set was causing
different behavior in the second `ldd` command between the two
environments.
While my SHELL environment issue is just one example, there are likely
more. The patchelf command that is constructed by snapcraft should be
consistent and not subject to environment variables in the host system.
For further debugging, here are strace logs for the second ldd command
in the "working" and "not working (segmentation fault)" environments.
Note that the working environment expects this second ldd command to
fail so it can move on to the LD_TRACE_LOADED_OBJECTS command
working: https://paste.ubuntu.com/p/HyJ6xvYJ3F/
not working: https://paste.ubuntu.com/p/2HngJk8qTX/
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https://bugs.launchpad.net/bugs/1928209
Title:
use of patchelf in classic leads to dri drivers segfaulting
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