re: PCU panic on V240

[matthew green <mrg%eterna.com.au@localhost>]

> panic: kernel diagnostic assertion "!cpu_intr_p()" failed: file 
> "/work/build/src/sys/kern/subr_xcall.c", line 351
[ .. ]
> This is the high priority xcall from subr_pcu.c and
> curcpu()->ci_idepth is zero.

this doesn't make sense.  ci_idepth should be zero here, and that
should force cpu_intr_p() to return false, and thus the ASSERT()
shouldn't fire.  has something changed ci_idepth between the check
and ddb???  yhuck.
 
> What is going wrong here?

assuming this has nothing to do with PCU, something very very
strange and unknown.


.mrg.