10-STABLE hangups frequently

[Peter Jeremy]

On 2016-Feb-02 14:52:37 +0200, Konstantin Belousov <kostikbel at gmail.com> wrote:
>Please gather the information listed at
>https://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html

Interestingly, as soon as I enable INVARIANTS, my kernel will no longer boot.
All the other options listed there are OK.

The console output ends:
TSC timecounter discards lower 1 bit(s)
Timecounter "TSC-low" frequency 1150026690 Hz quality 800
hwpc_core: unknown PMC architecture: 0
hwpmc: SOFT/16/64/0x67<INT,USR,SYS,REA,WRI>
init_KVMCLOCK_tc: 0x0000000b
KVM-style paravirtualized clock detected.
Timecounter "KVMCLOCK" frequency 1000000000 Hz quality 1000
WARNING: WITNESS option enabled, expect reduced performance.
WARNING: DIAGNOSTIC option enabled, expect reduced performance.
Trying to mount root from zfs:zroot []...
<<hang>>

Unfortunately, I don't have write access to the console so I can't
do anything other than reboot at this point.

(This is 10-stable/amd64 r295088).

If I have some spare time, I'll try reproducing this in a local VBox over
the next few days.

-- 
Peter Jeremy
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