Server crash due to buffer_head deadlocks spinning on BH_Uptodate_Lock

Solution Verified - Updated -

Issue

  • Server crashed while trying to acquire a bit-spinlock for a buffer_head I/O structure.
  • Server crashed due to tasks blocked waiting in softirq state.

Environment

  • Red Hat Enterprise Linux 6
  • ext4 with a block size smaller than page size (for example, a 1kB blocksize with a 4kB page size on x86_64)

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