Segmentation fault when fitting 2-dimensional array for class loess

[yjiangnan]

According to documentation in the files, class loess is able to handle multi-dimensional features:

loess = _loess.loess
"""
loess : locally weighted estimates. Multi-variate version
:Keywords:
    x : ndarray
        A (n,p) ndarray of independent variables, with n the number of observations
        and p the number of variables.
    y : ndarray
        A (n,) ndarray of observations

However, when I tried it, I simply got "Segmentation fault: 11". The code for reproduction is:

from numpy import *
x = random.randn(20, 5)
y = sum(x, axis=1) + sum(random.randn(20, 5), axis=1)
lo = loess(x, y)
lo.fit()

I tried to narrow down the location for the error by inserting output in the .c codes, and the problem is in line 41 in file loessc.c inside block "interpolate/1.approx":
F77_SUB(lowesb)(x, y, weights, diagonal, &one, iv, &liv, &lv, v);
This line seems to call a Fortran function lowesb. However, I am not sure how the interaction between C and Fortran works and how to write and debug Fortran codes. Can anyone identify and fix the problem, please?

By the way, I am using the python3-compatible version https://github.com/jcrotinger/pyloess. After the Segmentation fault, the OS shows the following crash report:
Process: Python [33329]
Path: /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python
Identifier: Python
Version: 3.6.0 (3.6.0)
Code Type: X86-64 (Native)
Parent Process: bash [79547]
Responsible: Python [33329]
User ID: 502

Date/Time: 2018-05-17 14:30:20.699 +0200
OS Version: Mac OS X 10.12.3 (16D32)
Report Version: 12
Anonymous UUID: 6F848FCA-A0EC-0BDD-4156-6F44A1C752ED

Sleep/Wake UUID: B93DB63A-E8E4-4627-BBE7-B3C3A8F29FD5

Time Awake Since Boot: 10000000 seconds
Time Since Wake: 2000000 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT
Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [0]

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 loess.cpython-36m-darwin.so 0x0000000103d2ba90 ehg139 + 1968
1 ??? 0xfff8000000000000 0 + 18444492273895866368

Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000014 rbx: 0x0000000000000000 rcx: 0x00007fff5bffd780 rdx: 0x00007fff5bffd820
rdi: 0x0000000000000015 rsi: 0xfff8000000000000 rbp: 0x0000000000000000 rsp: 0x00007fff5bffd520
r8: 0x0000000000000008 r9: 0x000000000000012c r10: 0x0000000000000000 r11: 0x0000000000000014
r12: 0x0000000000000000 r13: 0x0000000000000000 r14: 0x000000010117b728 r15: 0x000000010117c178
rip: 0x0000000103d2ba90 rfl: 0x0000000000010202 cr2: 0x0000000103d37cd0

Logical CPU: 3
Error Code: 0x00000000
Trap Number: 13

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

VM Region Summary:
ReadOnly portion of Libraries: Total=154.4M resident=0K(0%) swapped_out_or_unallocated=154.4M(100%)
Writable regions: Total=63.2M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=63.2M(100%)

                            VIRTUAL   REGION 

REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Kernel Alloc Once 8K 2
MALLOC 46.3M 28
MALLOC guard page 16K 4
MALLOC_LARGE (reserved) 384K 4 reserved VM address space (unallocated)
VM_ALLOCATE 8K 3
__DATA 4336K 96
__LINKEDIT 114.6M 35
__TEXT 39.8M 91
__UNICODE 556K 2
__UNIXSTACK 16.0M 2
shared memory 12K 4
=========== ======= =======
TOTAL 221.9M 260
TOTAL, minus reserved VM space 221.6M 260

Model: MacBookPro8,1, BootROM MBP81.0047.B2D, 2 processors, Intel Core i7, 2.8 GHz, 8 GB, SMC 1.68f99
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x80CE, 0x4D3437314235323733444D302D4348392020
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x80CE, 0x4D3437314235323733444D302D4348392020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.98.100.24)
Bluetooth: Version 5.0.3f1, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: Samsung SSD 850 EVO 500GB, 500.11 GB
Serial ATA Device: MATSHITADVD-R UJ-8A8
USB Device: USB 2.0 Bus
USB Device: Hub
USB Device: IR Receiver
USB Device: USB 2.0 Bus
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: Apple Internal Keyboard / Trackpad
USB Device: BRCM2070 Hub
USB Device: Bluetooth USB Host Controller
Thunderbolt Bus: MacBook Pro, Apple Inc., 22.1