dscheck() was returning without setting bp->b_error when given a negative block number.. (assuming Debugger() returned).  The disk drivers assume that dscheck() sets both error markers (bp->b_error and set B_ERROR in bp->b_flags) if it fails.
dscheck() was returning without setting bp->b_error when given a negative
block number.. (assuming Debugger() returned).  The disk drivers assume
that dscheck() sets both error markers (bp->b_error and set B_ERROR in
bp->b_flags) if it fails.

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