Segmentation fault on two instances of Magic (with custom magic_file) about python-magic HOT 6 CLOSED

cat go.py 
import magic
m1 = magic.Magic(magic_file='my.magic')
m2 = magic.Magic(magic_file='my.magic')

(gdb) set args go.py
(gdb) run
Starting program: /home/spinus/.virtualenvs/wc/bin/python go.py
warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7ffff7ffa000
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff5ecc804 in ?? () from /usr/lib/x86_64-linux-gnu/libmagic.so.1
(gdb) bt
#0  0x00007ffff5ecc804 in ?? () from /usr/lib/x86_64-linux-gnu/libmagic.so.1
#1  0x00007ffff5ecd541 in ?? () from /usr/lib/x86_64-linux-gnu/libmagic.so.1
#2  0x00007ffff5ecec2e in ?? () from /usr/lib/x86_64-linux-gnu/libmagic.so.1
#3  0x00007ffff5ecf635 in ?? () from /usr/lib/x86_64-linux-gnu/libmagic.so.1
#4  0x00007ffff694b834 in ffi_call_unix64 () from /home/spinus/.virtualenvs/wc/lib/python2.7/lib-dynload/_ctypes.so
#5  0x00007ffff694b2af in ffi_call () from /home/spinus/.virtualenvs/wc/lib/python2.7/lib-dynload/_ctypes.so
#6  0x00007ffff6938fd1 in _ctypes_callproc () from /home/spinus/.virtualenvs/wc/lib/python2.7/lib-dynload/_ctypes.so
#7  0x00007ffff6939742 in ?? () from /home/spinus/.virtualenvs/wc/lib/python2.7/lib-dynload/_ctypes.so
#8  0x00000000004acc66 in PyEval_EvalFrameEx ()
#9  0x00000000004b3fd8 in PyEval_EvalCodeEx ()
#10 0x00000000004b4c77 in ?? ()
#11 0x0000000000481cc4 in ?? ()
#12 0x0000000000460d0e in PyEval_CallObjectWithKeywords ()
#13 0x0000000000486707 in PyInstance_New ()
#14 0x00000000004acc66 in PyEval_EvalFrameEx ()
#15 0x00000000004b3fd8 in PyEval_EvalCodeEx ()
#16 0x0000000000536723 in ?? ()
#17 0x0000000000446bf2 in PyRun_FileExFlags ()
#18 0x00000000004470ec in PyRun_SimpleFileExFlags ()
#19 0x0000000000447cdc in Py_Main ()
#20 0x00007ffff6f17a55 in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#21 0x00000000004c7f39 in _start ()