I've tested this on Precise by running the attached script.

With the old package version (1:3.2.8-11ubuntu6.1) this caused top to crash 
after about 90 minutes.
With the new package version (1:3.2.8-11ubuntu6.3), it's been running without 
incident for the last 24 hours.

Note, that as we're dealing with a race between top reading the contents
of proc and processes being spawned/destroyed, it's tricky to reproduce
in a controlled manner, so I went for the brute-force approach.

Nothing else appears untoward with the new version.

** Attachment added: "Testscript for this issue"
   
https://bugs.launchpad.net/ubuntu/+source/procps/+bug/1242746/+attachment/3895695/+files/1242746-test.sh

** Tags removed: verification-needed
** Tags added: verification-done

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https://bugs.launchpad.net/bugs/1242746

Title:
  SIGSEGV when file2str reads zero bytes

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