I ran the -RC2 kernel for a week and am now running the -RC4 kernel,
both worked identically from my perspective.  I have not gotten the
queue stuck error message, but I experience significant issues with wifi
connectivity.  After a few minutes TCP connections seem to regularly
stall.  No error messages are generated although a wireshark on the
traffic shows fragmented TCP traffic that is dropped.  I do not know if
this is a new problem or a new expression of the old problem.  I have
also experienced several hard crashes with this kernel although they did
not appear to be linked to wifi.

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https://bugs.launchpad.net/bugs/1039205

Title:
  8086:4238 iwlwifi lost connections and poor performance with mixed
  networks

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