[tor-bugs] #25663 [Applications/Tor Browser]: Downloaded files are corrupted (sometimes)

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#25663: Downloaded files are corrupted (sometimes)
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     Reporter:  dgr                       |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 This happened several times to me already using the Tor Browser Bundle:
 1. Downloading a file.
 2. Saving the file in the default folder that TBB offers me (should be
 Downloads in the TBB's subtree).
 3. The Download finishes successfully.
 4. After some time I try to open the file. The file is corrupted. Its size
 is much smaller than what it should be. Observation: all files in the
 folder have the same date.

 OS: Linux
 Filesystem (this may be the key here!): btrfs

 My speculations:
 The last time it happened, I am pretty sure that TBB did an auto-update
 while the file was downloading. Considering the changed date of all files,
 I guess the whole subtree was rewritten including the Downloads folder.
 Maybe the copy-on-write feature of btrfs has something to do with the
 problem?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25663>
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