So, there are a few things mentioned here, let me answer them:

1. Any case where you see SIGABRT is usually Tracker killing itself due
to seriously high memory use. This has been removed for 1.3.x onwards.
What this means is, instead of getting a SIGABRT and the process
closing, your machine will be brought to its knees if there are broken
3rd party implementations OR files not following standards. This is
usually the reason for SIGABRT, it's rarely a Tracker bug.

2. The tracker-extract process has recently had a fail-safe added to it,
so if extraction attempts fail more than 'n' times, we will stop trying.
This avoids the "login, fail, login, fail, etc" cycle.

3. If you're seeing high memory use, please file a bug upstream with the
file(s) causing this and we will try to fix it. The same with slow down.
Some people have crazy PDF content (for example) which can take a LOOONG
time to extract and use GBs of memory. This is not Tracker's fault.

Finally, I want to add that the reason we have a tracker-extract process
is EXACTLY because 3rd party content or libraries are not reliable
enough and often deviate from standards. The process is built with
crashing expected at some point, and we do try our best NOT to let this
happen - but it's not always in our control.

Thanks,

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https://bugs.launchpad.net/bugs/538673

Title:
  tracker-extract seems to briefly consume 1.5GB memory and slow
  computer right down

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