Currently the python module will fail to import if dynamically linked against jemalloc >= 5.0.0. This is to do with how python dynamically loads extension modules and a change that was made to jemalloc in 5.0.0. It manifests in the following error

libjemalloc.so: cannot allocate memory in static TLS block

There are a few runtime solutions to this but I can't see a nice way of solving this within our builder.

1) Set LD_PRELOAD to point to the jemalloc.so i.e.

> export LD_PRELOAD=/path/to/jemalloc.so
> python
>> import pyopenvdb

2) Share symbols across extension libraries (only works form python 3.6)

> python
>> import sys, dl
>> sys.setdlopenflags(dl.RTLD_NOW | dl.RTLD_GLOBAL)
>> import pyopenvdb

Note that jemalloc can be built in such a way that the initial execution model for jemalloc's TLS is disabled, which I imagine will also fix the issue - but I don't count this as a solution. I suspect linking against jemalloc statically will also fix the issue.

Reference:
https://github.com/jemalloc/jemalloc/issues/937
https://github.com/jemalloc/jemalloc/blob/dev/INSTALL.md (--disable-initial-exec-tls)
https://stackoverflow.com/questions/19663366/dlopen-fails-in-boost-python-module