/usr/share/apport/whoopsie-upload-all:AssertionError:/usr/share/apport/whoopsie-upload-all@162:collect_info:process_report:add_gdb_info:crash_signature_addresses:_address_to_offset:_build_proc_maps_cache

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding apport. This problem was most recently seen with package version 2.20.11-0ubuntu27, the problem page at https://errors.ubuntu.com/problem/273e9176fa4ab3b0cd738b3fa4e782fabc3957a4 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

[Brian Murray (brian-murray)]

Traceback (most recent call last):
  File "/usr/share/apport/whoopsie-upload-all", line 162, in <module>
    stamps = collect_info()
  File "/usr/share/apport/whoopsie-upload-all", line 112, in collect_info
    res = process_report(r)
  File "/usr/share/apport/whoopsie-upload-all", line 79, in process_report
    r.add_gdb_info()
  File "/usr/lib/python3/dist-packages/apport/report.py", line 805, in add_gdb_info
    addr_signature = self.crash_signature_addresses()
  File "/usr/lib/python3/dist-packages/apport/report.py", line 1488, in crash_signature_addresses
    offset = self._address_to_offset(addr)
  File "/usr/lib/python3/dist-packages/apport/report.py", line 1661, in _address_to_offset
    self._build_proc_maps_cache()
  File "/usr/lib/python3/dist-packages/apport/report.py", line 1697, in _build_proc_maps_cache
    assert m, 'cannot parse ProcMaps line: ' + line
AssertionError: cannot parse ProcMaps line: Error: [Errno 13] Permission denied: 'maps'

[Brian Murray (brian-murray)]

This primarily seems to be affecting Ubuntu 18.04 LTS and is likely due to changes in version 2.20.9-0ubuntu7.14 of apport. Looking at some of the crash reports it seems they were trying to process an xorg crash e.g.:

640:0:117:5197353:2020-05-19 22:25:36.939364492 +0300:2020-05-19 22:25:32.903194868 +0300:/var/crash/_usr_lib_xorg_Xorg.0.crash

from https://errors.ubuntu.com/oops/84ca0a6a-9a06-11ea-9b4d-fa163e102db1.

[Brian Murray (brian-murray)]

The fix that was used for https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1866347, found in apport's focal branch r2748, works around this by not creating a crash address signature if ProcMaps contains a "Permission denied" error. However, I now wonder why permission was denied.