[Pkg-opencl-devel] Bug#997908: pocl: Assertion `td->printf_buffer != NULL' failed on armel/armhf

[Rebecca N. Palmer]

libgpuarray and theano are now using POCL_DEVICES=basic as a workaround 
for this.

libgpuarray also runs ulimit (and tries and fails to run clinfo) as a 
test for this bug:

https://ci.debian.net/data/autopkgtest/testing/armhf/libg/libgpuarray/16886452/log.gz

Testing with python3.9:
clinfo: ./lib/CL/devices/pthread/pthread_scheduler.c:512: 
pocl_pthread_driver_thread: Assertion `td->printf_buffer != NULL' failed.
clinfo: ./lib/CL/devices/pthread/pthread_scheduler.c:512: 
pocl_pthread_driver_thread: Assertion `td->printf_buffer != NULL' failed.
Aborted
time(seconds)        unlimited
file(blocks)         unlimited
data(kbytes)         unlimited
stack(kbytes)        8192
coredump(blocks)     0
memory(kbytes)       unlimited
locked memory(kbytes) 32776732
process              unlimited
nofiles              1024
vmemory(kbytes)      unlimited
locks                unlimited
rtprio               0
python3.9: ./lib/CL/devices/pthread/pthread_scheduler.c:512: 
pocl_pthread_driver_thread: Assertion `td->printf_buffer != NULL' failed.
python3.9: ./lib/CL/devices/pthread/pthread_scheduler.c:512: 
pocl_pthread_driver_thread: Assertion `td->printf_buffer != NULL' failed.
Aborted
*** Testing for basic-0xd0c
(tests pass)