[Bug 2076084] Re: Additional drivers tab cause uncancellable operation that prevents the program from closing

[Nathan Teodosio]

** Description changed:

  Start software-properties-gtk, switch to additional drivers tab. The
  program will start consuming 100% CPU for quite some time (many seconds
  or minutes depending on the machine).
  
  There is however no way to cancel the operation other than killing
  software-properties. Trying to close the window or clicking Close button
  hangs.
+ 
+ Test plans
+ ----------
+ 
+ 1. Start software-properties-gtk
+ 1.1. Go to additional drivers tab.
+ 1.2. Click close at the south-east corner or close the window via your window manager.
+ Expected. Window closes immediately.
+ 
+ 4. Start software-properties-gtk
+ 4.1. Go to additional drivers tab and wait.
+ Expected: The viewport will at the end say that either no drivers are available or show a list of drivers such as in the drivers-list.png attachment. The cancel and retry buttons are gone in the latter case.
+ 
+ 2. Start software-properties-gtk and 'top' in a terminal
+ 2.1. Go to additional drivers tab.
+ Expected: The 'python3' command starts consuming 100% CPU.
+ 2.2. Click cancel.
+ Expected: The aforementioned process is no longer hogging the CPU, indicating that the driver scan really stopped. The retry button is clickable but cancel is not.
+ 2.3. Click retry.
+ Expected: The 'python3' command starts consuming 100% CPU. The retry button is not clickable but cancel ist.
+ 
+ 3. Start software-properties-gtk and 'top' in a terminal
+ 3.1. Go to additional drivers tab.
+ 3.2. Get the PID of the 'python3' process consuming 100% CPU and kill it with kill -29 PID
+ Expected: The viewport says "An error blabla. Exit status: -29." Retry is clickable but cancel is not.

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https://bugs.launchpad.net/bugs/2076084

Title:
  Additional drivers tab cause uncancellable operation that prevents the
  program from closing

Status in software-properties package in Ubuntu:
  In Progress

Bug description:
  Start software-properties-gtk, switch to additional drivers tab. The
  program will start consuming 100% CPU for quite some time (many
  seconds or minutes depending on the machine).

  There is however no way to cancel the operation other than killing
  software-properties. Trying to close the window or clicking Close
  button hangs.

  Test plans
  ----------

  1. Start software-properties-gtk
  1.1. Go to additional drivers tab.
  1.2. Click close at the south-east corner or close the window via your window manager.
  Expected. Window closes immediately.

  4. Start software-properties-gtk
  4.1. Go to additional drivers tab and wait.
  Expected: The viewport will at the end say that either no drivers are available or show a list of drivers such as in the drivers-list.png attachment. The cancel and retry buttons are gone in the latter case.

  2. Start software-properties-gtk and 'top' in a terminal
  2.1. Go to additional drivers tab.
  Expected: The 'python3' command starts consuming 100% CPU.
  2.2. Click cancel.
  Expected: The aforementioned process is no longer hogging the CPU, indicating that the driver scan really stopped. The retry button is clickable but cancel is not.
  2.3. Click retry.
  Expected: The 'python3' command starts consuming 100% CPU. The retry button is not clickable but cancel ist.

  3. Start software-properties-gtk and 'top' in a terminal
  3.1. Go to additional drivers tab.
  3.2. Get the PID of the 'python3' process consuming 100% CPU and kill it with kill -29 PID
  Expected: The viewport says "An error blabla. Exit status: -29." Retry is clickable but cancel is not.

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