| From: D. Hugh Redelmeier <[email protected]>

| So I did it again with "non-destructive".  After an hour, it is still 
| stuck at 99% installing bootloader.

I left it for a bunch more hours.  I try to close its window: no
luck.  The ps command tells me that it has taken 100% CPU (only one
core, but still) all this time (about 10 hours of CPU).

This is not good behaviour.

strace says that it is in a single futex(nnn, FUTEX_WAIT_PRIVATE, 0,
NULL) syscall now, so I don't understand the 100% CPU.

FUTEX_WAIT_PRIVATE isn't a documented op for futex(2).  FUTEX_WAIT
doesn't look as if it should eat CPU.
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