Setup:
1. Have 32-channel USB sound card and a builtin sound card.
2. Concurrently:
2a. mplayer to play over USB channels 1 and 2 via a plug
2b. mplayer to play over USB channels 3 and 4 via a plug
Then, to produce issue:
3. While they are playing, mplayer to play over builtin sound card.

All sound cards hang. Have to hard reboot laptop.

Regression against Ubuntu 15.10.

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https://bugs.launchpad.net/bugs/1598636

Title:
  INFO: task alsa-sink-ALC32:3263 blocked for more than 120 seconds.

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