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Fish Magic - The case of a color-blind painter.

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January 2nd, 2006


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05:12 pm - The case of a color-blind painter.
I'm happy it turned out to be that simple, but the amount of such bugs and devastating consequences are humiliating.
Bug#7209 is a case of an intermittent failure when the best brain of Support department and dozens of man hours had to be spent to track the issue down to a repeatable test case. And the cause is such a trivial design mistake:
typedef struct st_hash {
  uint key_offset,key_length;           /* Length of key if const length */

  uint records,blength,current_record;
  DYNAMIC_ARRAY array;                          /* Place for hash_keys */

  /* cut */
} HASH;

gptr hash_search(HASH *info,const byte *key,uint length);

gptr hash_next(HASH *info,const byte *key,uint length);

Now, where does hash_next get the current position of the search? In st_hash::current_record, and it, obviously, makes the search non concurrent-safe.

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