python 2.7 on alpine 3.9 ctypes loadlibrary() failed with OSError: Error relocating ./cc.so: : initial-exec TLS resolves to dynamic definition in ./cc.so

[couragecc]

I want to call loadlibrary() for cgo build shared library from python2.7 script. It will failed on python2.7 + apline 3.9 as follows errors. But It works on ubuntu 16.04 + python2.7. Any thoughts or suggestions

/usr/src/app # go build -o cc.so -buildmode=c-shared main.go

/usr/src/app # readelf -d cc.so

Dynamic section at offset 0x10cd10 contains 22 entries:
Tag Type Name/Value
0x0000000000000001 (NEEDED) Shared library: [libc.musl-x86_64.so.1]
0x0000000000000010 (SYMBOLIC) 0x0
0x000000000000000c (INIT) 0x42000
0x000000000000000d (FINI) 0x92ed9
0x0000000000000019 (INIT_ARRAY) 0xa2078
0x000000000000001b (INIT_ARRAYSZ) 8 (bytes)
0x000000006ffffef5 (GNU_HASH) 0x270
0x0000000000000005 (STRTAB) 0xa50
0x0000000000000006 (SYMTAB) 0x378
0x000000000000000a (STRSZ) 1026 (bytes)
0x000000000000000b (SYMENT) 24 (bytes)
0x0000000000000003 (PLTGOT) 0x10deb0
0x0000000000000002 (PLTRELSZ) 720 (bytes)
0x0000000000000014 (PLTREL) RELA
0x0000000000000017 (JMPREL) 0x41a00
0x0000000000000007 (RELA) 0xe58
0x0000000000000008 (RELASZ) 265128 (bytes)
0x0000000000000009 (RELAENT) 24 (bytes)
0x000000000000001e (FLAGS) SYMBOLIC BIND_NOW STATIC_TLS
0x000000006ffffffb (FLAGS_1) Flags: NOW NODELETE
0x000000006ffffff9 (RELACOUNT) 11040
0x0000000000000000 (NULL) 0x0

/usr/src/app # python test.py
Traceback (most recent call last):
File "test.py", line 2, in
lib = ctypes.cdll.LoadLibrary('./cc.so')
File "/usr/lib/python2.7/ctypes/init.py", line 444, in LoadLibrary
return self._dlltype(name)
File "/usr/lib/python2.7/ctypes/init.py", line 366, in init
self._handle = _dlopen(self._name, mode)
OSError: Error relocating ./cc.so: : initial-exec TLS resolves to dynamic definition in ./cc.so

[tao12345666333]

what's your go version? 1.11.5 ?

[couragecc]

The main.go and test.py are as follows,
//main.go
package main

import "C"

//export add
func add(left, right int) int {
return left + right
}

//export minus
func minus(left, right int) int {
return left - right
}

//export multiply
func multiply(left, right int) int {
return left * right
}

//export divide
func divide(left, right int) int {
return left / right
}

//export testPrint
func testPrint(){
print("test")
}

func main() {
}

// test.py
import ctypes
lib = ctypes.cdll.LoadLibrary('./cc.so')
if lib is not None:
print ("can load so")

[couragecc]

what's your go version? 1.11.5 ?

Yes. It is 1.11.5. But I also try the 10 and 12. The same problem

[tianon]

Closing given this isn't related to our image: /usr/lib/python2.7 (we don't install Python to that path, so for it to show up in your output you're either not using our image or not using the python we compiled in it).

In the future, these sorts of questions/requests would be more appropriately posted to the Docker Community Forums, the Docker Community Slack, or Stack Overflow.