[tor-bugs] #20746 [Applications/Tor Browser]: TBB - What are /tmp/0123.mlf files (where 0123 is PID of Firefox)

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#20746: TBB - What are /tmp/0123.mlf files (where 0123 is PID of Firefox)
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     Reporter:  ronvandaal_               |      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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 Using tor-browser-linux64-6.0.6_en-US.tar.xz

 This is a general question, but related to the other ticket #200100

 In /tmp/ I found some files (*.MLF) , filename is the PID of Firefox.

 (for example, the process "0123 ./firefox --class Tor Browser -profile
 TorBrowser/Data/Browser/profile.default" relates to /tmp/1234.mlf)

 What are MLF files? Never seen them before. They appeared after a TBB's
 browser crashed and couldn't restart due to a faulty Browser/libxul.so.


 Anyway. They seem memory dumps. But why?

 (2268780 bytes) First bytes header (if any) starting with 010100790a2a21

 Example of readable contents:

 $ strings 0189.mlf
 /home/ronv/tor-browser/Browser/libnspr4.so
 /home/ronv/tor-browser/Browser/libplc4.so
 /home/ronv/tor-browser/Browser/libplds4.so
 /home/ronv/tor-browser/Browser/libnssutil3.so
 /home/ronv/tor-browser/Browser/libnss3.so
 /home/ronv/tor-browser/Browser/libsmime3.so
 /home/ronv/tor-browser/Browser/libssl3.so
 /home/ronv/tor-browser/Browser/libmozsqlite3.so
 /home/ronv/tor-browser/Browser/liblgpllibs.so
 /home/ronv/tor-browser/Browser/libxul.so
 /home/ronv/tor-browser/Browser/browser/components/libbrowsercomps.so
 /home/ronv/tor-browser/Browser/libsoftokn3.so
 /home/ronv/tor-browser/Browser/libfreebl3.so
 /home/ronv/tor-browser/Browser/libnssckbi.so

 Ideas? Anyone?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20746>
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