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block_submit_bio will return -ENOLINK if called during a forced shutdown, the bio is never submitted, and thus no completion callback will fire to set BLOCK_BIT_ERROR. Any other task waiting for this specific bp will end up waiting forever. To fix, fall through to the existing block_end_io call on the error path instead of returning directly. That means moving the forcing_unmount check past the setup calls so block_end_io's bookkeeping stays balanced. block_end_io then sets BLOCK_BIT_ERROR and wakes up waiters just as it would on a failed async completion. Signed-off-by: Auke Kok <auke.kok@versity.com>