when reading large blocks of data (like iso images) the transfer rate will drop at an uncertain point and the client system stalls. (just like the "stall on write" bug, only while reading). Recompiling kernel with 1.0.4 files solves this problem.
fixed primarily by changes to fs/cifs/connect.c in socket handling (fix is certainly in 2.6.10 kernels or later and patches on website for earlier kernels)