freebsd stable - Jul 2017 - The 11.1-RC3 can only boot and attach disks in "Safe mode", otherwise gets stuck attaching

> Thanks! Tried it, and the message (or a backtrace) does not show
> during a boot of a generic (patched) kernel, at least not in
> the last 40-lines screen before the hang occurs.
> (It also does not show during a "Safe mode" successful boot.)
Btw (may or may not be relevant): after the above experiment
I have rebooted the machine in "Safe mode" (generic kernel,
EARLY_AP_STARTUP enabled by default) - and spent some time
doing non-intensive interactive work on this host (web browsing,
editor, shell, all under KDE) - and after about an hour the
machine froze: clock display not updating, keyboard unresponsive,
console virtual terminals inaccessible) - so had to reboot.
According to fans speed the machine was idle.
The /var/log/messages does not show anything of interest
before the freeze. All disks are under ZFS.

Can EARLY_AP_STARTUP have an effect also _after_ booting?
This host never hung during normal work when EARLY_AP_STARTUP
was disabled (or with 11.0 and earlier).

   Mark

Based on your boot info you're using mps, so this could be related to 
mps fix committed to stable/11 today by ken@
https://svnweb.freebsd.org/changeset/base/321415

re@ cc'ed as this could cause hangs for others too on 11.1-RELEASE if 
this is the case.

     Regards
     Steve

On 24/07/2017 15:55, Mark Martinec wrote:
>> Thanks! Tried it, and the message (or a backtrace) does not show
>> during a boot of a generic (patched) kernel, at least not in
>> the last 40-lines screen before the hang occurs.
>> (It also does not show during a "Safe mode" successful boot.)
>
> Btw (may or may not be relevant): after the above experiment
> I have rebooted the machine in "Safe mode" (generic kernel,
> EARLY_AP_STARTUP enabled by default) - and spent some time
> doing non-intensive interactive work on this host (web browsing,
> editor, shell, all under KDE) - and after about an hour the
> machine froze: clock display not updating, keyboard unresponsive,
> console virtual terminals inaccessible) - so had to reboot.
> According to fans speed the machine was idle.
> The /var/log/messages does not show anything of interest
> before the freeze. All disks are under ZFS.
>
> Can EARLY_AP_STARTUP have an effect also _after_ booting?
> This host never hung during normal work when EARLY_AP_STARTUP
> was disabled (or with 11.0 and earlier).
>
>   Mark
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