[Bug 1579712] Re: Refresh hangs indefinitely, appstreamcli using 100% CPU

[Dennis W.]

i had problems today to make "sudo apt update" it don't went away so
that i can got "sudo apt dist-upgrade"

i can terminate appstreamcli in system-monitor but that loading not all
packets

This fix has "repaired" the Problem, i quete the #24

After this working there came any Pakets it wont's to have install, is
that normally and or regulate Updates ?

"Weird, I wonder what happened that many people are experiencing this now...
Removing `/usr/bin/appstreamcli` is fine if you install the fixed package afterwards.

To install this manually, please do (for amd64, adjust URLs for other
architectures):

```
cd /tmp && mkdir asfix
cd asfix
wget https://launchpad.net/ubuntu/+archive/primary/+files/appstream_0.9.4-1ubuntu1_amd64.deb
wget https://launchpad.net/ubuntu/+archive/primary/+files/libappstream3_0.9.4-1ubuntu1_amd64.deb
sudo dpkg -i *.deb
```

This should solve the issue. Please report back if this is fixed, or if
you are still experiencing issues!"

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https://bugs.launchpad.net/bugs/1579712

Title:
  Refresh hangs indefinitely, appstreamcli using 100% CPU

Status in appstream package in Ubuntu:
  Fix Released
Status in appstream source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

   * The cache refresh is blocked on a strdup on a non-NULL-terminated string in some very rare occasions (very rare because this bug is present for almost 3y without a single report).
   * Fixing this bug resolves the issue for people who might experience it.
   * See https://github.com/ximion/appstream/issues/35 for details.

  [Test Case 1]

   * Run `sudo appstreamcli refresh --force`
   * The AppStream cache should be updated, no change in behavior should be seen.

  [Test Case 2]

   * In case you were experiencing the almost-infinite hang when running
  `sudo appstreamcli refresh --force`, this issue should be fixed with
  the SRU.

  [Regression Potential]

   * Very low, since this only fixes the decompression code. There
  should be no sideeffects of that (given that the patch itself doesn't
  break anything, which it shouldn't, since it has been tested upstream
  for a while)

  [Other Info]

   * This fix has been applied upstream: https://github.com/ximion/appstream/commit/f33c520c37e2ba51d92402220250b8d501a2bf43
   * A smaller version of the patch (one-liner) is available, at the expense of not having reduced memory usage: https://github.com/ximion/appstream/commit/378941787d3584b3eb31a6ebe40e0aacc10e180a

  ####

  /!\ Installing the bugfix from xenial-proposed, without going through APT:
  To install the fixed packages manually, please execute the following commands (for amd64, adjust URLs for other architectures):

  ```
  cd /tmp && mkdir asfix
  cd asfix
  wget https://launchpad.net/ubuntu/+archive/primary/+files/appstream_0.9.4-1ubuntu1_amd64.deb
  wget https://launchpad.net/ubuntu/+archive/primary/+files/libappstream3_0.9.4-1ubuntu1_amd64.deb
  sudo dpkg -i libappstream3*.deb
  sudo dpkg -i appstream*.deb
  ```

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