[Bug 217242] CPU hard lockup related to xhci/dma

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217242

Austin Domino (austin.domino@hotmail.com) changed:

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--- Comment #1 from Austin Domino (austin.domino@hotmail.com) ---
The same problem has been seen on Intel NUC7i5BNK, ASRock NUC BOX-1260P,
LattePanda Delta 3 and other compact computers of the sort, and if enough
individual processes are doing USB serial communications (ttyUSB/ttyACM) at
once and it matches or exceeds the number of CPU cores, the entire CPU can get
locked up until the watchdog frees things up.  Most lock ups of this sort are
resolved after ~20-25 seconds, but some have lasted over 20 minutes!  There's
several options to get around this problem. One of which is to set the CPU
affinity so at least 1 core won't ever be used for USB serial communications. 
Another one is to use a semaphore to add a similar limitation.

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