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problem goes away if we reduce the trigger rate to 71kHz.  even "ls" on the drp node will hang until the trigger rate is reduced to 71kHz.  "ls" hanging is reproducible even when running only 1 of the two hsd's on a drp.  pgp driver and firmware haven't changed since February.  caused by conda compiler work? no. can see problem with pgpread with both old/new compilers.  maybe it's having 2 hsd's on a drp (interrupts may still be firing even when we don't run the second hsd drp executable).  Matt has been unable to reproduce with fakecam so far.  Update: found that even running 1 hsd that interrupts for both hsd's were firing (saw counters in /proc/datadev_1 incrementing).  Followed Matt's advice and "unconfigure" disabled the second hsd's interrupts, and in this configuration there were no more soft lockups.

UNSOLVED (1MHz): with both the fake cam and hsd Matt saw that if he ran at 1MHz then disabled for a few seconds then reenabled that all the buffers were stuck in software and system would hang.

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