Public bug reported:

To replicate this bug do:
1. Open two terminals.
2. on the first terminal: $ mkfifo fifo
3. on the first terminal: $ tail -f fifo
4. on the second terminal write several times: $ echo "somestring" > fifo , 
changing somestring each time.

Some of the strings sometimes will not appear in 'tail'. 
Unfortunately this bug is not deterministic.

It happened in Gutsy x86 and I couldn't replicate in in Feisty.

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Description changed:

  To replicate this bug do:
  1. Open two terminals.
  2. on the first terminal: $ mkfifo fifo
  3. on the first terminal: $ tail -f fifo
  4. on the second terminal write several times: $ echo "somestring" > fifo , 
changing somestring each time.
  
  Some of the strings sometimes will not appear in 'tail'. 
  Unfortunately this bug is not deterministic.
+ 
+ It happened in Gutsy x86 and I couldn't replicate in in Feisty.

-- 
FIFO skips or blocks data stream
https://bugs.launchpad.net/bugs/151520
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