This looks like duplicate of bz1694411 I am only thrown off by the version librepo-1.9.5 which shouldn't have the bug yet.
If the version used was indeed 1.9.5 then the code in question was reworked in https://github.com/rpm-software-management/librepo/commit/3549e61bd34213b421c49f942db2576d327ca1c5 (which incidentally caused the mentioned bz1694411) and it should be fixed in newer releases.
I am closing this bug for now, but if I am mistaken or if you are still able to reproduce this please don't hesitate to reopen it.
Reproducible: always try the internal 1minutetip service. I suppose, it's caused by calling "--enablerepo=updates-testing-modular" on Rawhide, which does not have such repo (atleast I think so) ------------------------------------------------------------------- # dnf module info mariadb:10.3 --enablerepo=updates-testing-modular | Fedora - Modular Rawhide - Developmental packages for the next Fedora release | 36 kB/s | 16 kB 00:00 | Fedora - Rawhide - Developmental packages for the next Fedora release | 190 kB/s | 16 kB 00:00 | python3: /builddir/build/BUILD/librepo-1.9.5/librepo/downloader.c:2663: lr_download: Assertion `dd.running_transfers == NULL' failed. | ] --- B/s | 0 B --:-- ETA | Aborted (core dumped [obraz paměti uložen]) ------------------------------------------------------------------- # coredumpctl -1 TIME PID UID GID SIG COREFILE EXE Thu 2019-06-20 10:48:05 EDT 1054 0 0 6 present /usr/bin/python3.7 ------------------------------------------------------------------- # coredumpctl info -1 PID: 1054 (dnf) UID: 0 (root) GID: 0 (root) Signal: 6 (ABRT) Timestamp: Thu 2019-06-20 10:48:03 EDT (3min 32s ago) Command Line: /usr/bin/python3 /usr/bin/dnf module info mariadb:10.3 --enablerepo=updates-testing-modular Executable: /usr/bin/python3.7 Control Group: /user.slice/user-0.slice/session-4.scope Unit: session-4.scope Slice: user-0.slice Session: 4 Owner UID: 0 (root) Boot ID: f155e724f438419e8fa3de12d529f27c Machine ID: 78722d4a61d145e9af550b0781bbf998 Hostname: host-10-0-137-4 Storage: /var/lib/systemd/coredump/core.dnf.0.f155e724f438419e8fa3de12d529f27c.1054.1561042083000000.lz4 Message: Process 1054 (dnf) of user 0 dumped core. Stack trace of thread 1054: #0 0x00007f0203accef5 raise (libc.so.6) #1 0x00007f0203ab78d5 abort (libc.so.6) #2 0x00007f0203ab77a9 __assert_fail_base.cold (libc.so.6) #3 0x00007f0203ac55f6 __assert_fail (libc.so.6) #4 0x00007f01f58343a0 lr_download (librepo.so.0) #5 0x00007f01f5834540 lr_download_single_cb (librepo.so.0) #6 0x00007f01f5845273 lr_yum_download_repo (librepo.so.0) #7 0x00007f01f5845ad5 lr_yum_perform (librepo.so.0) #8 0x00007f01f58395dd lr_handle_perform (librepo.so.0) #9 0x00007f01f5991a90 _ZN6libdnf4Repo4Impl15lrHandlePerformEP9_LrHandleRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEb (libdnf.so.2) #10 0x00007f01f5993dc4 _ZN6libdnf4Repo4Impl5fetchERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEOSt10unique_ptrI9_LrHandleSt14default_deleteISB_EE (libdnf.so.2) #11 0x00007f01f5994944 _ZN6libdnf4Repo4Impl4loadEv (libdnf.so.2) #12 0x00007f01f429c8db n/a (_repo.so) #13 0x00007f0203857d21 _PyMethodDef_RawFastCallKeywords (libpython3.7m.so.1.0) #14 0x00007f0203857e53 _PyCFunction_FastCallKeywords (libpython3.7m.so.1.0) #15 0x00007f020389a2da n/a (libpython3.7m.so.1.0) #16 0x00007f02038e8271 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #17 0x00007f0203882da2 _PyFunction_FastCallKeywords (libpython3.7m.so.1.0) #18 0x00007f020389a1bf n/a (libpython3.7m.so.1.0) #19 0x00007f02038e8271 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #20 0x00007f0203882da2 _PyFunction_FastCallKeywords (libpython3.7m.so.1.0) #21 0x00007f020389a1bf n/a (libpython3.7m.so.1.0) #22 0x00007f02038e8271 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #23 0x00007f0203882da2 _PyFunction_FastCallKeywords (libpython3.7m.so.1.0) #24 0x00007f020389a1bf n/a (libpython3.7m.so.1.0) #25 0x00007f02038e33f7 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #26 0x00007f0203881f10 _PyEval_EvalCodeWithName (libpython3.7m.so.1.0) #27 0x00007f0203882f40 _PyFunction_FastCallKeywords (libpython3.7m.so.1.0) #28 0x00007f020389a1bf n/a (libpython3.7m.so.1.0) #29 0x00007f02038e41f0 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #30 0x00007f0203882da2 _PyFunction_FastCallKeywords (libpython3.7m.so.1.0) #31 0x00007f020389a1bf n/a (libpython3.7m.so.1.0) #32 0x00007f02038e33f7 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #33 0x00007f0203882da2 _PyFunction_FastCallKeywords (libpython3.7m.so.1.0) #34 0x00007f020389a1bf n/a (libpython3.7m.so.1.0) #35 0x00007f02038e33f7 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #36 0x00007f0203882da2 _PyFunction_FastCallKeywords (libpython3.7m.so.1.0) #37 0x00007f020389a1bf n/a (libpython3.7m.so.1.0) #38 0x00007f02038e3350 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #39 0x00007f0203882da2 _PyFunction_FastCallKeywords (libpython3.7m.so.1.0) #40 0x00007f020389a1bf n/a (libpython3.7m.so.1.0) #41 0x00007f02038e3350 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #42 0x00007f0203881f10 _PyEval_EvalCodeWithName (libpython3.7m.so.1.0) #43 0x00007f0203882f40 _PyFunction_FastCallKeywords (libpython3.7m.so.1.0) #44 0x00007f020389a1bf n/a (libpython3.7m.so.1.0) #45 0x00007f02038e3350 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #46 0x00007f0203881f10 _PyEval_EvalCodeWithName (libpython3.7m.so.1.0) #47 0x00007f0203882f40 _PyFunction_FastCallKeywords (libpython3.7m.so.1.0) #48 0x00007f020389a1bf n/a (libpython3.7m.so.1.0) #49 0x00007f02038e41f0 _PyEval_EvalFrameDefault (libpython3.7m.so.1.0) #50 0x00007f0203881f10 _PyEval_EvalCodeWithName (libpython3.7m.so.1.0) #51 0x00007f0203882c79 PyEval_EvalCodeEx (libpython3.7m.so.1.0) #52 0x00007f0203882c9b PyEval_EvalCode (libpython3.7m.so.1.0) #53 0x00007f02039471f3 n/a (libpython3.7m.so.1.0) #54 0x00007f02039472a7 PyRun_FileExFlags (libpython3.7m.so.1.0) #55 0x00007f020394c3dd PyRun_SimpleFileExFlags (libpython3.7m.so.1.0) #56 0x00007f020394e08c n/a (libpython3.7m.so.1.0) #57 0x00007f020394e23c _Py_UnixMain (libpython3.7m.so.1.0) #58 0x00007f0203ab8f73 __libc_start_main (libc.so.6) #59 0x000055d11e61408e _start (python3.7)