Dear Maintainer, this can be reproduced in current Bookworm/testing too.
The backtrace below shows PyBytes_FromString received for parameter str a NULL, which documentation states must not be NULL [1]. Unfortunately could not find an issue or update in upstream page [2]. Kind regards, Bernhard [1] https://docs.python.org/3/c-api/bytes.html [2] https://github.com/facebookincubator/pystemd $ cat test.py from pystemd.dbuslib import DBus bus=DBus(user_mode=True) bus.get_unique_name() $ $ python3 test.py pystemd.dbusexc.DBusBaseError: [err -22]: Failed to get unique name This is DBusBaseError, a base error for DBus (i bet you did not see that coming) if you need a special error, enhance pystemd.sysdexc module!. Exception ignored in: 'pystemd.dbuslib.DBus.get_unique_name' Traceback (most recent call last): File "/home/benutzer/test.py", line 3, in <module> bus.get_unique_name() pystemd.dbusexc.DBusBaseError: [err -22]: Failed to get unique name This is DBusBaseError, a base error for DBus (i bet you did not see that coming) if you need a special error, enhance pystemd.sysdexc module!. Speicherzugriffsfehler (Speicherabzug geschrieben) $ # coredumpctl gdb 1246 (gdb) bt #0 __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:76 #1 0x000000000059f40c in PyBytes_FromString (str=0x0) at ../Objects/bytesobject.c:153 #2 0x00007f360fb7b6a6 in __pyx_pf_7pystemd_7dbuslib_4DBus_20get_unique_name (__pyx_v_self=<optimized out>) at pystemd/dbuslib.c:10541 #3 __pyx_pw_7pystemd_7dbuslib_4DBus_21get_unique_name (__pyx_v_self=<optimized out>, unused=<optimized out>) at pystemd/dbuslib.c:10525 #4 0x000000000055a850 in method_vectorcall_NOARGS (func=<method_descriptor at remote 0x7f360fbc3ba0>, args=0x7f3610512070, nargsf=<optimized out>, kwnames=0x0) at ../Objects/descrobject.c:453 #5 0x000000000053983c in _PyObject_VectorcallTstate (kwnames=<optimized out>, nargsf=<optimized out>, args=<optimized out>, callable=<method_descriptor at remote 0x7f360fbc3ba0>, tstate=0xa85258 <_PyRuntime+166328>) at ../Include/internal/pycore_call.h:92 #6 PyObject_Vectorcall (callable=<method_descriptor at remote 0x7f360fbc3ba0>, args=<optimized out>, nargsf=<optimized out>, kwnames=<optimized out>) at ../Objects/call.c:299 ... (gdb) py-bt Traceback (most recent call first): File "/home/benutzer/test.py", line 3, in <module> bus.get_unique_name() (gdb) $ cat -n pystemd/dbuslib.c | grep 10541 -C10 10531 10532 static PyObject *__pyx_pf_7pystemd_7dbuslib_4DBus_20get_unique_name(struct __pyx_obj_7pystemd_7dbuslib_DBus *__pyx_v_self) { 10533 PyObject *__pyx_r = NULL; 10534 __Pyx_RefNannyDeclarations 10535 PyObject *__pyx_t_1 = NULL; 10536 int __pyx_lineno = 0; 10537 const char *__pyx_filename = NULL; 10538 int __pyx_clineno = 0; 10539 __Pyx_RefNannySetupContext("get_unique_name", 0); 10540 __Pyx_XDECREF(__pyx_r); 10541 __pyx_t_1 = __Pyx_PyBytes_FromString(__pyx_f_7pystemd_7dbuslib_4DBus_get_unique_name(__pyx_v_self, 1)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 526, __pyx_L1_error) 10542 __Pyx_GOTREF(__pyx_t_1); 10543 __pyx_r = __pyx_t_1; 10544 __pyx_t_1 = 0; 10545 goto __pyx_L0; 10546 10547 /* function exit code */ ... $ $ cat -n pystemd/dbuslib.pyx | grep 536 -C10 526 cpdef const char* get_unique_name(self): 527 cdef: 528 int r 529 const char *unique_name 530 531 r = dbusc.sd_bus_get_unique_name(self.bus, &unique_name) 532 533 if r < 0: 534 raise DBusError(r, None, "Failed to get unique name") 535 536 return unique_name 537 538 cpdef int get_fd(self): ... $
