Bhyve: panic: "Unregistered use of FPU in kernel" when starting guest

[sree.openwrk]

Update- After enabling hw watchdog- by loading the ichwd kernel module and
starting the watchdog daemon I am not getting any clue.
After enabling hw-watchdog and starting the guest, the system becomes
unresponsive. Neither does the watchdogd trigger a system reboot.
I followed this-
http://koitsu.wordpress.com/2010/07/13/freebsd-and-hardwaresoftware-watchdogs/-
to enable hw-watchdog.



On Sun, Nov 25, 2012 at 3:46 PM, sree.openwrk <sree.openwrk at gmail.com>wrote:

> Hey Neel
> I tried to see if the problem is reproducible after the fix went in.
> Looks like I have landed in to another issue. Now when I start the guest
> vm, the host hangs and could only be rebooted. Since its not a crash I am
> not able to get a crash dump. Is this a known issue? Also is there a way I
> can config and get to kick off a trace using something lie a hw-watchdog or
> something?
>
> Reproduction steps-
> 1. I have 8gb memory and I have limited the host to see only 4gb.
> svas-fbsd# sysctl -a | grep hw.physmem
> hw.physmem: 3116384256
>
> output from dmesg-
> real memory  = 8589934592 (8192 MB)
> avail memory = 2999402496 (2860 MB)
>
> 2. I checkedout the latest code from svn://
> svn.freebsd.org/base/projects/bhyve. The revision number is 243326. The
> host has this image built out of this.
>
> 3.  These are the steps I followed, before starting the guest. Then it
> hangs.
>     a) kldload vmm
>     b) kldload if_tap
>     c) ifconfig tap0 create
>
> 4. I use the prebuilt tarball given at
> http://people.freebsd.org/~neel/bhyve/vm1.tar.gz.
>
> 5. I start the vm as ./vmrun.sh vm1 and it hangs after displaying the
> message "Launching virtual machine "vm1" with 768MB memory below 4GB and
> 2048MB memory above 4GB ..."
>
> Thanks
>
>
>
>
> On Thu, Oct 25, 2012 at 8:16 PM, Neel Natu <neelnatu at gmail.com> wrote:
>
>> Hi svas,
>>
>> I just submitted a fix for this:
>> http://svnweb.freebsd.org/base?view=revision&revision=242122
>>
>> Please let me know if this fixes the panic you reported.
>>
>> best
>> Neel
>>
>> On Sun, Oct 7, 2012 at 11:12 AM, sree.openwrk <sree.openwrk at gmail.com>
>> wrote:
>> > Hey Neel
>> > Sure. I will reproduce the issue and try to narrow down the problem.
>> > Will update you, if I am able to narrow down the problem.
>> >
>> > Thanks
>> >
>> >
>> > On Thu, Oct 4, 2012 at 9:07 PM, Neel Natu <neelnatu at gmail.com> wrote:
>> >>
>> >> Hi svas,
>> >>
>> >> On Thu, Oct 4, 2012 at 5:58 PM, sree.openwrk <sree.openwrk at gmail.com>
>> >> wrote:
>> >> > Hi
>> >> > I am seeing frequent kernel panic when I try to run the guest OS. I
>> have
>> >> > the
>> >> > latest Freebsd (I compiled the latest code from
>> >> > svn://svn.freebsd.org/base/projects/bhyve and installed it in my
>> >> > machine).
>> >> > While trying to run the pre-built guest provided at
>> >> > http://people.freebsd.org/~neel/bhyve/vm1.tar.gz I get the kernel
>> panic
>> >> > (panic: Unregistered use of FPU in kernel)
>> >> > I am attaching the core.txt.
>> >> > I also want to mention that I was successfully able to boot in to the
>> >> > guest
>> >> > OS couple of times. But around 7/10 times I get thsi host kernel
>> panic.
>> >> >
>> >> > stack trace:
>> >> > vm_run() at vm_run+0xec
>> >> > vmmdev_ioctl() at vmmdev_ioctl+0x4ea
>> >> > devfs_ioctl_f() at devfs_ioctl_f+0x7a
>> >> > kern_ioctl() at kern_ioctl+0xcd
>> >> > sys_ioctl() at sys_ioctl+0xfd
>> >> > amd64_syscall() at amd64_syscall+0x304
>> >> > Xfast_syscall() at Xfast_syscall+0xf7
>> >> >
>> >>
>> >> I am seeing this too but nowhere as frequently as you are. I hit this
>> >> last night for the first time and not since.
>> >>
>> >> There hasn't been any change in this part of the code for quite some
>> time
>> >> now.
>> >>
>> >> Since you can trigger this much more frequently that me, would it be
>> >> possible for you to narrow down which change caused this? It would be
>> >> hugely helpful.
>> >>
>> >> best
>> >> Neel
>> >>
>> >> >
>> >> > regards
>> >> > svas
>> >> >
>> >> >
>> >
>> >
>>
>
>