Bad SMP race in getblk()

From: Mark Hemment (
Date: Wed Aug 02 2000 - 06:33:42 EST

David, all,

  Just noticed this.

  getblk() (fs/buffer.c) can now be called without the BLK being held.
  After searching the hash table (get_hash_table()), a free buffer-head
can be claimed off the freelist and inserted into the hash-table without
re-checking the hash-table (the hash-table lock is dropped between the
original search and new insert). This gives serious problems on SMP.


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