It may be the 'nbytes<1' line. It can perhaps be changed to 'nbytes<8'.
A few sleep commands in the loop are also not a bad idea either.

In either case, we've had a very cursory attempt at:

https://github.com/Openand-I/haveged/commit/a71df191b15a610140e420f2f17da558e6ebca08

Specifically around lines: 558, 568 for an idea of what we did to solve
the issue on Android and Ubuntu.

BTW, great usability improvements can be seen simply by freeing up the
entropy collection from user input.

Cursory, pun intended :)

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https://bugs.launchpad.net/bugs/1318678

Title:
  haveged consumes 100% cpu when used with -w > 4067

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