Issue 1:
Trying to squish the memory leaks reported by valgrind during in the test suit, I noticed that we do not have tp_traverse implemented. There are two things here: First, tp_traverse for the base attribute, and second for object arrays. I guess we should implement both, or is there some reason against object array traversal?

Issue 2:
Using numpy 1.15.0rc2 wheels, numpy.dot faults with a Bus error: 10 if the call is made from a non main thread which is not a 'Python native' thread; in particular a Qt5 QThreadPool's managed thread (via PyQt5).

Code

import numpy as np

from PyQt5.QtCore import QRunnable, QThreadPool

pool = QThreadPool.globalInstance()

class Runnable(QRunnable):
def __init__(self, target):
super().__init__()
self._target = target

def run(self):
self._target()

A = np.random.rand(150, 100)
B = np.random.rand(100, 1000)

rs = []
for i in range(10):
def run():
np.dot(A, B)

r = Runnable(run)
pool.start(r)
rs.append(r)

pool.waitForDone()

This faults in:

Thread 4 Crashed:: Thread (pooled)
0 libopenblasp-r0.3.0.dev.dylib	0x000000010fc443c2 dgemm_thread_nn + 1490
1 libopenblasp-r0.3.0.dev.dylib	0x000000010fb15e26 cblas_dgemm + 854
2 multiarray.cpython-36m-darwin.so	0x000000010f9aa265 cblas_matrixproduct + 4917
3 multiarray.cpython-36m-darwin.so	0x000000010f96fd27 PyArray_MatrixProduct2 + 215
4 multiarray.cpython-36m-darwin.so	0x000000010f974d1f array_matrixproduct + 191
5 org.python.python	0x000000010f074af3 _PyCFunction_FastCallDict + 461

(the full report)

Process: Python [11650]
Path: /usr/local/Cellar/python/3.6.5_1/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python
Identifier: Python
Version: 3.6.5 (3.6.5)
Code Type: X86-64 (Native)
Parent Process: bash [23859]
Responsible: Terminal [505]
User ID: 501

Date/Time: 2018-07-11 15:16:20.098 +0200
OS Version: Mac OS X 10.11.6 (15G20015)
Report Version: 11
Anonymous UUID: 6B468A1E-8CB4-EC03-324B-AA83B1B93698

Sleep/Wake UUID: 850D839F-C482-4814-9D32-8C614C762A56

Time Awake Since Boot: 1300000 seconds
Time Since Wake: 7800 seconds

System Integrity Protection: enabled

Crashed Thread: 4 Thread (pooled)

Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000700000189250

VM Regions Near 0x700000189250:
Stack 0000700000107000-0000700000189000 [ 520K] rw-/rwx SM=COW thread 4
--> Stack Guard 0000700000189000-000070000018a000 [ 4K] ---/rwx SM=NUL
Stack 000070000018a000-000070000020c000 [ 520K] rw-/rwx SM=COW

Thread 0:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib	0x00007fff9062bdb6 __psynch_cvwait + 10
1 libsystem_pthread.dylib	0x00007fff8c987728 _pthread_cond_wait + 767
2 org.qt-project.QtCore	0x000000011b00126b 0x11afd1000 + 197227
3 org.qt-project.QtCore	0x000000011b001202 QWaitCondition::wait(QMutex*, unsigned long) + 162
4 org.qt-project.QtCore	0x000000011aff8269 QThreadPoolPrivate::waitForDone(int) + 217
5 org.qt-project.QtCore	0x000000011aff87c3 QThreadPool::waitForDone(int) + 19
6 QtCore.so	0x000000011adfa8fa meth_QThreadPool_waitForDone(_object*, _object*, _object*) + 138
7 org.python.python	0x000000010f074af3 _PyCFunction_FastCallDict + 461
8 org.python.python	0x000000010f0dc52c call_function + 562
9 org.python.python	0x000000010f0d9937 _PyEval_EvalFrameDefault + 26877
10 org.python.python	0x000000010f0dcd09 _PyEval_EvalCodeWithName + 1910
11 org.python.python	0x000000010f0d2f8a PyEval_EvalCode + 100
12 org.python.python	0x000000010f0fd6cd run_mod + 58
13 org.python.python	0x000000010f0fc709 PyRun_FileExFlags + 178
14 org.python.python	0x000000010f0fbfa7 PyRun_SimpleFileExFlags + 668
15 org.python.python	0x000000010f1108b2 Py_Main + 3562
16 org.python.python	0x000000010f028e19 0x10f027000 + 7705
17 libdyld.dylib	0x00007fff906145ad start + 1

Thread 1:
0 libsystem_kernel.dylib	0x00007fff9062bdb6 __psynch_cvwait + 10
1 libsystem_pthread.dylib	0x00007fff8c987728 _pthread_cond_wait + 767
2 libopenblasp-r0.3.0.dev.dylib	0x000000010fe2272b blas_thread_server + 187
3 libsystem_pthread.dylib	0x00007fff8c98699d _pthread_body + 131
4 libsystem_pthread.dylib	0x00007fff8c98691a _pthread_start + 168
5 libsystem_pthread.dylib	0x00007fff8c984351 thread_start + 13

Thread 2:
0 libsystem_kernel.dylib	0x00007fff9062bdb6 __psynch_cvwait + 10
1 libsystem_pthread.dylib	0x00007fff8c987728 _pthread_cond_wait + 767
2 libopenblasp-r0.3.0.dev.dylib	0x000000010fe2272b blas_thread_server + 187
3 libsystem_pthread.dylib	0x00007fff8c98699d _pthread_body + 131
4 libsystem_pthread.dylib	0x00007fff8c98691a _pthread_start + 168
5 libsystem_pthread.dylib	0x00007fff8c984351 thread_start + 13

Thread 3:
0 libsystem_kernel.dylib	0x00007fff9062bdb6 __psynch_cvwait + 10
1 libsystem_pthread.dylib	0x00007fff8c987728 _pthread_cond_wait + 767
2 libopenblasp-r0.3.0.dev.dylib	0x000000010fe2272b blas_thread_server + 187
3 libsystem_pthread.dylib	0x00007fff8c98699d _pthread_body + 131
4 libsystem_pthread.dylib	0x00007fff8c98691a _pthread_start + 168
5 libsystem_pthread.dylib	0x00007fff8c984351 thread_start + 13

Thread 4 Crashed:: Thread (pooled)
0 libopenblasp-r0.3.0.dev.dylib	0x000000010fc443c2 dgemm_thread_nn + 1490
1 libopenblasp-r0.3.0.dev.dylib	0x000000010fb15e26 cblas_dgemm + 854
2 multiarray.cpython-36m-darwin.so	0x000000010f9aa265 cblas_matrixproduct + 4917
3 multiarray.cpython-36m-darwin.so	0x000000010f96fd27 PyArray_MatrixProduct2 + 215
4 multiarray.cpython-36m-darwin.so	0x000000010f974d1f array_matrixproduct + 191
5 org.python.python	0x000000010f074af3 _PyCFunction_FastCallDict + 461
6 org.python.python	0x000000010f0dc52c call_function + 562
7 org.python.python	0x000000010f0d9937 _PyEval_EvalFrameDefault + 26877
8 org.python.python	0x000000010f0dd68e _PyFunction_FastCall + 121
9 org.python.python	0x000000010f0dc506 call_function + 524
10 org.python.python	0x000000010f0d9937 _PyEval_EvalFrameDefault + 26877
11 org.python.python	0x000000010f0dd68e _PyFunction_FastCall + 121
12 org.python.python	0x000000010f03b2f9 _PyObject_FastCallDict + 218
13 org.python.python	0x000000010f03b418 _PyObject_Call_Prepend + 149
14 org.python.python	0x000000010f03b160 PyObject_Call + 101
15 sip.so	0x000000011b5bb3c9 call_method + 85
16 sip.so	0x000000011b5b7348 sip_api_call_procedure_method + 156
17 QtCore.so	0x000000011add199a sipQRunnable::run() + 90
18 org.qt-project.QtCore	0x000000011aff706e 0x11afd1000 + 155758
19 org.qt-project.QtCore	0x000000011afffc47 0x11afd1000 + 191559
20 libsystem_pthread.dylib	0x00007fff8c98699d _pthread_body + 131
21 libsystem_pthread.dylib	0x00007fff8c98691a _pthread_start + 168
22 libsystem_pthread.dylib	0x00007fff8c984351 thread_start + 13

Thread 4 crashed with X86 Thread State (64-bit):
rax: 0x0000700000189410 rbx: 0x0000000113c7f5d0 rcx: 0x0000000000000000 rdx: 0x0000000000000040
rdi: 0x0000000000000000 rsi: 0x0000700000189410 rbp: 0x0000700000209280 rsp: 0x0000700000185d90
r8: 0x0000000113c7f5d0 r9: 0x0000000000000004 r10: 0x0000000000000000 r11: 0x0000000080000001
r12: 0x0000000000000004 r13: 0x0000000000000000 r14: 0x0000000000000004 r15: 0x0000000100000003
rip: 0x000000010fc443c2 rfl: 0x0000000000010246 cr2: 0x0000700000189250

Logical CPU: 1
Error Code: 0x00000006
Trap Number: 14

Binary Images:
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0x7fff99930000 - 0x7fff9993fffb com.apple.LangAnalysis (1.7.0 - 1.7.0) <18D21123-A3E7-3851-974A-08E5D4540475> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LangAnalysis.framework/Versions/A/LangAnalysis
0x7fff99989000 - 0x7fff9999aff7 libz.1.dylib (61.20.1) <B3EBB42F-48E3-3287-9F0D-308E04D407AC> /usr/lib/libz.1.dylib
0x7fff99c07000 - 0x7fff99dcdff7 com.apple.ImageIO.framework (3.3.0 - 1462) <78862785-0667-35F6-87C0-A1B1FA3588A7> /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
0x7fff99dce000 - 0x7fff99e42ff3 com.apple.securityfoundation (6.0 - 55126) <DB67837E-9813-3C25-896A-CB6FA800F366> /System/Library/Frameworks/SecurityFoundation.framework/Versions/A/SecurityFoundation
0x7fff99e70000 - 0x7fff99e81fff libcmph.dylib (6) <BA4BF2C6-7F4E-33B8-9DD7-619C9EB83ECF> /usr/lib/libcmph.dylib
0x7fff99e82000 - 0x7fff99e99ff7 libsystem_asl.dylib (323.50.1) <41F8E11F-1BD0-3F1D-BA3A-AA1577ED98A9> /usr/lib/system/libsystem_asl.dylib
0x7fff99eed000 - 0x7fff99f91fff com.apple.Bluetooth (4.4.6 - 4.4.6f2) <C84D30C1-DC2E-356E-A8C8-DA496CA659CB> /System/Library/Frameworks/IOBluetooth.framework/Versions/A/IOBluetooth
0x7fff99f92000 - 0x7fff99facff3 liblzma.5.dylib (10) <CC03591B-FA57-3CA5-AC81-0D76033AC0CE> /usr/lib/liblzma.5.dylib
0x7fff9a396000 - 0x7fff9a39bff7 libheimdal-asn1.dylib (453.40.11) <41620070-8AA6-3566-8520-67C65F6FA0DF> /usr/lib/libheimdal-asn1.dylib
0x7fff9a767000 - 0x7fff9a772fff com.apple.CrashReporterSupport (10.11 - 718) <43A265E6-47D6-35F9-8C27-387DE099E9E4> /System/Library/PrivateFrameworks/CrashReporterSupport.framework/Versions/A/CrashReporterSupport
0x7fff9a7c6000 - 0x7fff9a7cefff libcopyfile.dylib (127) <A48637BC-F3F2-34F2-BB68-4C65FD012832> /usr/lib/system/libcopyfile.dylib
0x7fff9aac6000 - 0x7fff9aaefff7 libxslt.1.dylib (14.6) <ADD24C4F-3B96-304E-8EE5-5F5B0EA62991> /usr/lib/libxslt.1.dylib
0x7fff9aaf0000 - 0x7fff9aaf0ff7 libkeymgr.dylib (28) <8371CE54-5FDD-3CE9-B3DF-E98C761B6FE0> /usr/lib/system/libkeymgr.dylib
0x7fff9aaf1000 - 0x7fff9ab0dff3 libresolv.9.dylib (60) <A650B5C8-1950-36A0-86D1-0B2465318BFA> /usr/lib/libresolv.9.dylib
0x7fff9ab0e000 - 0x7fff9ab19ff7 libcommonCrypto.dylib (60075.50.1) <D81DA58F-A07A-3358-A09C-BE2C83F9CAD2> /usr/lib/system/libcommonCrypto.dylib
0x7fff9af28000 - 0x7fff9af74fff com.apple.print.framework.PrintCore (11.2 - 472.2) <5AE8AA6B-CE09-397D-B0D4-0F9CCBF1F77D> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Versions/A/PrintCore
0x7fff9b382000 - 0x7fff9b528ff7 com.apple.audio.toolbox.AudioToolbox (1.13 - 1.13) <370E95BC-956C-3962-86CC-0A14CF6A0389> /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox
0x7fff9b735000 - 0x7fff9b737ff7 libRadiance.dylib (1464) <B0EA74D9-BC3B-3C5F-8D35-C3AADB5BD61F> /System/Library/Frameworks/ImageIO.framework/Versions/A/Resources/libRadiance.dylib
0x7fff9b807000 - 0x7fff9b82bfff libJPEG.dylib (1464) <492AEE9D-5D4B-3063-A380-FA8561103D55> /System/Library/Frameworks/ImageIO.framework/Versions/A/Resources/libJPEG.dylib
0x7fff9b82c000 - 0x7fff9b835ff3 libsystem_notify.dylib (150.40.1) <D48BDE34-0F7E-34CA-A0FF-C578E39987CC> /usr/lib/system/libsystem_notify.dylib
0x7fff9b8e5000 - 0x7fff9b8f1fff com.apple.speech.synthesis.framework (5.4.12 - 5.4.12) <71DA00B8-5EA2-326B-8814-59DB25512F65> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/SpeechSynthesis.framework/Versions/A/SpeechSynthesis
0x7fff9ba1a000 - 0x7fff9ba1bffb libSystem.B.dylib (1226.10.1) <2CBB584D-A69C-36AA-A432-8E4E334EA589> /usr/lib/libSystem.B.dylib
0x7fff9ba1c000 - 0x7fff9ba6dfff com.apple.audio.CoreAudio (4.3.0 - 4.3.0) <EA7D4F3B-062B-3C81-A98C-C89264D00D48> /System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio
0x7fff9bc9c000 - 0x7fff9bccdfff com.apple.GSS (4.0 - 2.0) <23A5ACE3-683C-3E32-9A9B-05FC934AFAFB> /System/Library/Frameworks/GSS.framework/Versions/A/GSS
0x7fff9c5ad000 - 0x7fff9c642fff com.apple.ink.framework (10.9 - 214) <1F76CF36-3F79-36B8-BC37-C540AF34B338> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework/Versions/A/Ink
0x7fff9ccff000 - 0x7fff9cd02fff libCoreVMClient.dylib (119.5) <560D70FB-709F-3030-96C9-F249FCB7DA6D> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libCoreVMClient.dylib
0x7fff9ce0b000 - 0x7fff9ce0cfff libDiagnosticMessagesClient.dylib (100) <4243B6B4-21E9-355B-9C5A-95A216233B96> /usr/lib/libDiagnosticMessagesClient.dylib
0x7fff9d06a000 - 0x7fff9d06dfff libsystem_sandbox.dylib (460.60.4) <907BB546-2F67-30B0-9B5B-05EC5F249EB2> /usr/lib/system/libsystem_sandbox.dylib
0x7fff9d088000 - 0x7fff9d31efff libmecabra.dylib (696.5) <EF6C0BD4-5FE8-34FB-8ADF-69A53CEC97A9> /usr/lib/libmecabra.dylib
0x7fff9d322000 - 0x7fff9d364ff7 com.apple.Metal (56.6 - 56.6) <30518711-8D00-3759-AA19-800D3C88E693> /System/Library/Frameworks/Metal.framework/Versions/A/Metal
0x7fff9dafc000 - 0x7fff9db01ff7 libmacho.dylib (875.1) <318264FA-58F1-39D8-8285-1F6254EE410E> /usr/lib/system/libmacho.dylib
0x7fff9de4c000 - 0x7fff9de54fef libsystem_platform.dylib (74.40.2) <29A905EF-6777-3C33-82B0-6C3A88C4BA15> /usr/lib/system/libsystem_platform.dylib
0x7fff9de64000 - 0x7fff9deb7ff7 libc++.1.dylib (120.1) <8FC3D139-8055-3498-9AC5-6467CB7F4D14> /usr/lib/libc++.1.dylib
0x7fff9debe000 - 0x7fff9df0fff7 libcups.2.dylib (435.2) <91584A40-214D-33E8-A613-CE22289037C8> /usr/lib/libcups.2.dylib
0x7fff9e023000 - 0x7fff9e097ff7 com.apple.Heimdal (4.0 - 2.0) <72D36F0E-2D3D-316E-870E-E68BF30F1D7D> /System/Library/PrivateFrameworks/Heimdal.framework/Versions/A/Heimdal
0x7fff9e248000 - 0x7fff9e250fff com.apple.NetFS (6.0 - 4.0) <842A5346-24C3-3F22-9ECF-E586A10EA1F2> /System/Library/Frameworks/NetFS.framework/Versions/A/NetFS
0x7fff9e352000 - 0x7fff9e362fff libbsm.0.dylib (34) <7E14504C-A8B0-3574-B6EB-5D5FABC72926> /usr/lib/libbsm.0.dylib
0x7fff9e369000 - 0x7fff9e36bfff libCVMSPluginSupport.dylib (12.1) <994EFFFB-132C-3670-B738-5316EB8051F4> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libCVMSPluginSupport.dylib
0x7fff9e4dc000 - 0x7fff9e4f8ff7 libsystem_malloc.dylib (67.40.1) <5748E8B2-F81C-34C6-8B13-456213127678> /usr/lib/system/libsystem_malloc.dylib
0x7fff9e6c2000 - 0x7fff9e71efff libTIFF.dylib (1464) <0328905B-AF97-39D1-A631-E1A4376014CF> /System/Library/Frameworks/ImageIO.framework/Versions/A/Resources/libTIFF.dylib
0x7fff9e71f000 - 0x7fff9e765fff libFontRegistry.dylib (155.4) <EA64114D-1069-3D4D-BB6A-3F5769EE63B5> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontRegistry.dylib
0x7fff9e766000 - 0x7fff9e78fff7 libxpc.dylib (765.70.1) <4FB1311F-4032-3F56-BF0B-CFF45D78FB01> /usr/lib/system/libxpc.dylib
0x7fff9e790000 - 0x7fff9eb8cfff libLAPACK.dylib (1162.2) <987E42B0-5108-3065-87F0-9DF7616A8A06> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib
0x7fff9eca8000 - 0x7fff9ecf7ff7 com.apple.opencl (2.7.0 - 2.7.0) <F410C203-0A88-35AB-8C06-D0E1A0209DA8> /System/Library/Frameworks/OpenCL.framework/Versions/A/OpenCL
0x7fff9edcf000 - 0x7fff9edcffff libenergytrace.dylib (10.40.1) <0A491CA7-3451-3FD5-999A-58AB4362682B> /usr/lib/libenergytrace.dylib
0x7fff9f71e000 - 0x7fff9f720fff com.apple.loginsupport (1.0 - 1) <9B2F5F9B-ED38-313F-B798-D2B667BCD6B5> /System/Library/PrivateFrameworks/login.framework/Versions/A/Frameworks/loginsupport.framework/Versions/A/loginsupport
0x7fff9f721000 - 0x7fff9f745fff com.apple.MultitouchSupport.framework (304.12 - 304.12) <2B4AC448-89A8-3A3F-947F-06B5BF069DAF> /System/Library/PrivateFrameworks/MultitouchSupport.framework/Versions/A/MultitouchSupport
0x7fff9f746000 - 0x7fff9f796ff7 com.apple.Symbolication (1.4 - 58044) <F70BF765-FBE9-3F1E-85CA-BB2F8E53E8C2> /System/Library/PrivateFrameworks/Symbolication.framework/Versions/A/Symbolication
0x7fff9f7fe000 - 0x7fff9f865fff com.apple.framework.CoreWiFi (11.0 - 1101.20) <91C5A231-0F7B-3B6A-A2D9-D389DBE9E1EB> /System/Library/PrivateFrameworks/CoreWiFi.framework/Versions/A/CoreWiFi
0x7fffa0ab9000 - 0x7fffa0abefff com.apple.TCC (1.0 - 1) <F5EEB2D3-9517-3975-97BE-22CB8E11B8A3> /System/Library/PrivateFrameworks/TCC.framework/Versions/A/TCC
0x7fffa0af6000 - 0x7fffa0af6fff com.apple.Accelerate.vecLib (3.10 - vecLib 3.10) <054DFE32-737D-3211-9A14-0FC5E1A880E3> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib
0x7fffa0b39000 - 0x7fffa0b3eff3 libunwind.dylib (35.3) <F6EB48E5-4D12-359A-AB54-C937FBBE9043> /usr/lib/system/libunwind.dylib
0x7fffa0c5b000 - 0x7fffa0cb9fff com.apple.SystemConfiguration (1.14 - 1.14) <F083C2B2-6162-358F-9270-98EE9FE58A08> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
0x7fffa0cba000 - 0x7fffa0d6afe7 libvMisc.dylib (563.5) <40346E9C-FC15-375F-A4FB-FE94EBE490B4> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib
0x7fffa0dbe000 - 0x7fffa0dc0fff libsystem_coreservices.dylib (19.2) <1B3F5AFC-FFCD-3ECB-8B9A-5538366FB20D> /usr/lib/system/libsystem_coreservices.dylib
0x7fffa1090000 - 0x7fffa11daff7 com.apple.coreui (2.1 - 366.1) <A004F065-6CDF-3456-A114-C6B3404D8A50> /System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI
0x7fffa11db000 - 0x7fffa11e3fff libsystem_networkextension.dylib (385.40.36) <66095DC7-6539-38F2-95EE-458F15F6D014> /usr/lib/system/libsystem_networkextension.dylib
0x7fffa1274000 - 0x7fffa12a3ff7 com.apple.DictionaryServices (1.2 - 250.3) <30250542-CBAA-39C1-91AA-B57A5DE17594> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/DictionaryServices.framework/Versions/A/DictionaryServices
0x7fffa1411000 - 0x7fffa1433ff7 com.apple.Sharing (442.13.6 - 442.13.6) <DDD2811C-6ECB-32F2-8EE1-69BF9657B4A8> /System/Library/PrivateFrameworks/Sharing.framework/Versions/A/Sharing

External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 2
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 364995092
thread_create: 0
thread_set_state: 141

VM Region Summary:
ReadOnly portion of Libraries: Total=297.0M resident=0K(0%) swapped_out_or_unallocated=297.0M(100%)
Writable regions: Total=190.2M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=190.2M(100%)

VIRTUAL REGION
REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 2048K 2
Kernel Alloc Once 4K 2
MALLOC 32.7M 20
MALLOC guard page 32K 7
MALLOC_LARGE (reserved) 512K 3 reserved VM address space (unallocated)
STACK GUARD 16K 5
Stack 18.0M 6
Stack Guard 4K 2
VM_ALLOCATE 8200K 21
VM_ALLOCATE (reserved) 128.0M 3 reserved VM address space (unallocated)
__DATA 18.9M 216
__IMAGE 528K 2
__LINKEDIT 98.2M 38
__TEXT 198.8M 212
__UNICODE 552K 2
shared memory 12K 4
=========== ======= =======
TOTAL 506.2M 529
TOTAL, minus reserved VM space 377.7M 529

Model: iMac17,1, BootROM IM171.0151.B00, 4 processors, Intel Core i5, 3.3 GHz, 16 GB, SMC 2.34f2
Graphics: AMD Radeon R9 M395, AMD Radeon R9 M395, PCIe, 2048 MB
Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1867 MHz, 0x802C, 0x31364B544631473634485A2D314739453220
Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1867 MHz, 0x802C, 0x31364B544631473634485A2D314739453220
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x14A), Broadcom BCM43xx 1.0 (7.21.95.178.1a2)
Bluetooth: Version 4.4.6f2, 3 services, 27 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: APPLE HDD ST2000DM001, 2 TB
Serial ATA Device: APPLE SSD SM0128G, 121.33 GB
USB Device: USB 3.0 Bus
USB Device: Bluetooth USB Host Controller
USB Device: FaceTime HD Camera (Built-in)
USB Device: Keyboard Hub
USB Device: Apple Keyboard
Thunderbolt Bus: iMac, Apple Inc., 28.1

Unfortunately I cannot duplicate this with Python's threading module. I am not sure why that is - openblas, python and Qt5 use the same posix threading model underneath.

Building numpy 1.15.0rc2 against OpenBLAS 3.1.0 (from homebrew) seems to fix this. OpenBLAS 3.1.0 release notes do feature a note: 'rewritten thread initialization code with significantly reduced overhead'

Is it too late in the 1.15.0 release plan to rebuild and retest with OpenBLAS 3.1.0?

Python: 3.6.5

Platform: macOS (10.11.6)

Numpy: 1.15.0rc2 with openblas 3.0.0 (pypi wheel)