scp-dbus-service.py crashed with SIGSEGV in _PyObject_GC_UNTRACK_impl()

[Hans van Wyk]

not sure what it is I just saw there was n bug - I am new to Linux

ProblemType: Crash
DistroRelease: Ubuntu 20.04
Package: system-config-printer-common 1.5.12-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
Uname: Linux 5.4.0-14-generic x86_64
ApportVersion: 2.20.11-0ubuntu20
Architecture: amd64
CurrentDesktop: Budgie:GNOME
Date: Sun Mar 15 02:22:17 2020
ExecutablePath: /usr/share/system-config-printer/scp-dbus-service.py
InstallationDate: Installed on 2020-03-14 (0 days ago)
InstallationMedia: Ubuntu-Budgie 20.04 LTS "Focal Fossa" - Alpha amd64 (20200312)
InterpreterPath: /usr/bin/python3.8
Lpstat: device for L365: dnssd://EPSON%20L365%20Series._pdl-datastream._tcp.local/
MachineType: Universal Exports Group Limited ITL 1403-I3 128
PackageArchitecture: all
Papersize: a4
PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/L365.ppd'] failed with exit code 2: grep: /etc/cups/ppd/L365.ppd: Permission denied
ProcCmdline: /usr/bin/python3 /usr/share/system-config-printer/scp-dbus-service.py
ProcEnviron:
 LANGUAGE=en_ZA:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_ZA.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-14-generic root=UUID=464449a8-03b3-4536-9504-744640ef4b27 ro quiet splash vt.handoff=7
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu1
PythonDetails: N/A
SegvAnalysis:
 Segfault happened at: 0x506f57: mov %rcx,(%rdx)
 PC (0x00506f57) ok
 source "%rcx" ok
 destination "(%rdx)" (0x00000004) not located in a known VMA region (needed writable region)!
 Stack memory exhausted (SP below stack segment)
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: system-config-printer
StacktraceTop:
 ?? ()
 ?? () from /usr/lib/python3/dist-packages/cups.cpython-38-x86_64-linux-gnu.so
 __nptl_deallocate_tsd () at pthread_create.c:301
 __nptl_deallocate_tsd () at pthread_create.c:256
 start_thread (arg=<optimized out>) at pthread_create.c:488
Title: scp-dbus-service.py crashed with SIGSEGV in __nptl_deallocate_tsd()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
dmi.bios.date: 04/29/2019
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 0429
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Default
dmi.board.vendor: Default
dmi.board.version: Type2 - Board Version
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnINSYDECorp.:bvr0429:bd04/29/2019:svnUniversalExportsGroupLimited:pnITL1403-I3128:pvrTBDbyOEM:rvnDefault:rnDefault:rvrType2-BoardVersion:cvnChassisManufacture:ct10:cvrChassisVersion:
dmi.product.family: Notepad
dmi.product.name: ITL 1403-I3 128
dmi.product.sku: ITL 1403-I3 128
dmi.product.version: TBD by OEM
dmi.sys.vendor: Universal Exports Group Limited
separator:

[Apport retracing service (apport)]

StacktraceTop:
 _PyObject_GC_UNTRACK_impl (filename=0x6ccecb "../Objects/classobject.c", lineno=250, op=0x7fcd7a23e3c0) at ../Include/internal/pycore_object.h:69
 method_dealloc (im=0x7fcd7a23e3c0) at ../Objects/classobject.c:250
 _Py_DECREF (filename=<synthetic pointer>, lineno=541, op=<optimized out>) at /usr/include/python3.8/object.h:478
 _Py_XDECREF (op=<optimized out>) at /usr/include/python3.8/object.h:541
 destroy_TLS (value=0x7fcd5c002ad0) at cupsmodule.c:67

[Apport retracing service (apport)]

StacktraceTop:
 _PyObject_GC_UNTRACK_impl (filename=0x6ccecb "../Objects/classobject.c", lineno=250, op=0x7fcd7a23e3c0) at ../Include/internal/pycore_object.h:69
 method_dealloc (im=0x7fcd7a23e3c0) at ../Objects/classobject.c:250
 _Py_DECREF (filename=<synthetic pointer>, lineno=541, op=<optimized out>) at /usr/include/python3.8/object.h:478
 _Py_XDECREF (op=<optimized out>) at /usr/include/python3.8/object.h:541
 destroy_TLS (value=0x7fcd5c002ad0) at cupsmodule.c:67

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sebastien Bacher (seb128)]

Till, could you investigate this one? It's getting quite some error reports on focal

https://errors.ubuntu.com/problem/6d7bfea86d67824d5688cd0732fb5c85ab5e05bc

[Till Kamppeter (till-kamppeter)]

Forwarded upstream:

https://github.com/OpenPrinting/system-config-printer/issues/176

[Till Kamppeter (till-kamppeter)]

Actually a python-cups problem, solved in the newest (2.0.1) upstream release:

https://github.com/OpenPrinting/system-config-printer/issues/176#issuecomment-627738281

Asked Debian maintainers to update python-cups so that it syncs into Ubuntu.

[Sebastien Bacher (seb128)]

Till, could you work on the python-cups fix (update or cherry pick of the commit) and the SRU for focal?

[Till Kamppeter (till-kamppeter)]

python3-cups 2.0.1 is already in Groovy.