[Bug 2107542] Re: gnome-control-center crashes when opening the Wellbeing panel

[Alessandro Astone]

** Description changed:

+ [ Impact ]
+ 
  gnome-control-center crashes when opening the Wellbeing panel after
  opening the Date & Time panel.
  
  SIGABRT in g_assertion_message() from g_assertion_message_expr() from
  allocate_duration_to_day() from allocate_duration_to_days()
  
+ The crash is because glib2.0 is calling localtime_r() without first
+ calling tzset(), meaning it may be reading stale timezone data.
+ Eventually this causes an unexpected discrepancy in the date processing
+ and triggers an assertion in gnome-control-center.
+ 
+ 
+ [ Test Plan ]
+ 
+ 1. Open Settings (gnome-control-center)
+ 2. Navigate to System > Date & Time
+ 3. Navigate to Wellbeing
+ 4. Observe that the Wellbeing page opened and the app did not crash
+ 
+ 
+ [ Where problems could occur ]
+ 
+ glib2 is a core library used by most software in Ubuntu Desktop.
+ Adding external function calls in a core library like glib2.0 must take multi-threading into consideration.
+ We are adding a call to tzset() in a function that already calls localtime_r(). Both functions have the same thread-safety attributes "MT-Safe env locale", so we are not modifying the thread-safety of the caller function.
+ 
+ 
+ [ Other info ]
+ 
  The Ubuntu Error Tracker has been receiving reports about a problem regarding gnome-control-center.  This problem was most recently seen with package version 1:48.0-1ubuntu3, the problem page at https://errors.ubuntu.com/problem/bf69c6dfa0112f64cb2a7a02165e22928931c7f7 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/.

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https://bugs.launchpad.net/bugs/2107542

Title:
  gnome-control-center crashes when opening the Wellbeing panel

Status in gnome-control-center:
  New
Status in glib2.0 package in Ubuntu:
  In Progress
Status in gnome-control-center package in Ubuntu:
  Won't Fix
Status in glib2.0 source package in Plucky:
  Triaged

Bug description:
  [ Impact ]

  gnome-control-center crashes when opening the Wellbeing panel after
  opening the Date & Time panel.

  SIGABRT in g_assertion_message() from g_assertion_message_expr() from
  allocate_duration_to_day() from allocate_duration_to_days()

  The crash is because glib2.0 is calling localtime_r() without first
  calling tzset(), meaning it may be reading stale timezone data.
  Eventually this causes an unexpected discrepancy in the date
  processing and triggers an assertion in gnome-control-center.

  
  [ Test Plan ]

  1. Open Settings (gnome-control-center)
  2. Navigate to System > Date & Time
  3. Navigate to Wellbeing
  4. Observe that the Wellbeing page opened and the app did not crash

  
  [ Where problems could occur ]

  glib2 is a core library used by most software in Ubuntu Desktop.
  Adding external function calls in a core library like glib2.0 must take multi-threading into consideration.
  We are adding a call to tzset() in a function that already calls localtime_r(). Both functions have the same thread-safety attributes "MT-Safe env locale", so we are not modifying the thread-safety of the caller function.

  
  [ Other info ]

  The Ubuntu Error Tracker has been receiving reports about a problem regarding gnome-control-center.  This problem was most recently seen with package version 1:48.0-1ubuntu3, the problem page at https://errors.ubuntu.com/problem/bf69c6dfa0112f64cb2a7a02165e22928931c7f7 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/.

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