[Bug 201624] BTX halted using 10.x with root on ZFS supermicro AMD

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201624

            Bug ID: 201624
           Summary: BTX halted using 10.x with root on ZFS supermicro AMD
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mike.selner at gmail.com

Hello, I have a supermicro server with motherboard H8DMR-i2 v2.0
(http://www.supermicro.com/aplus/motherboard/opteron2000/mcp55/h8dmr-i2.cfm)
The bios is at the latest level and I have 2 - 6core AMD CPUs.

I've been running FreeBSD 9.3 with ZFS on root. When upgrading to 10.0 using
freebsd-update -r 10.1-RELEASE. The upgrade completes but the system halts on
reboot:

Code:
BTX loader 1.00  BTX version is 1.02                      
Consoles: internal video/keyboard                        
BIOS drive A: is disk8                             
BIOS drive C: is disk9                                
int=00000000  err=00000000  efl=00010246  eip=00037df4              
eax=00000001  ebx=00000000  ecx=00000000  edx=00000000            
esi=00000000  edi=00000000  ebp=00092600  esp=00092598             
cs=002b    ds=0033  es=0033    fs=0033  gs=0033  ss=0033                
cs:eip=f7 35 90 f5 03 00 85 f6-74 05 89 3e 89 5e 04 89              
       c2 e9 cc 00 00 00 66 c7-45 ea 00 00 89 d8 c1 e8            
ss:esp=00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00             
       00 00 00 00 00 00 00 00-00 00 00 00 c8 25 09 00                
BTX halted


After the POST, the "spinning cursor" appears for just a second or two before
it halts.


I did a fresh 10.1 install on a new disk (same server) and the same thing
happened. I also tried 10.2 beta
(FreeBSD-10.2-PRERELEASE-amd64-20150704-r285132-memstick.img) with the same
result.  

The system works fine on 9.3/zfs as well as 10.x/ufs. The problem only seems to
occur on 10.x. 

I booted using a 10.1 installer memstick and went to a shell. I can import the
ZFS "zroot" pool. I verified that the /boot/ directory contents of this pool
matched the install memstick /boot/ (except kernel symbols files are not on the
installer).

Can someone please advise on next steps to resolve? I have a number of these
systems and I would very much like to run 10.x.

It does boot and run OK using FreeBSD-11.0-CURRENT-amd64-20150625-r284814.

Thanks
Mike

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