[XEN] xs_single device/vbd xs_talkv read_reply panic: bad stray interrupt

Brad Pitney pitney.brad at googlemail.com
Sat Aug 23 10:31:10 UTC 2008

On Sat, Aug 23, 2008 at 2:13 AM, Kip Macy <kmacy at freebsd.org> wrote:
> There is no way for a device to show up as xbd0 at this time. Next
> time you see the mount root prompt type ?.
> From my config:
> <...>
> disk = [ 'file:/home/kmacy/xen/mdroot-7.0,hda,w' ]
> <...>
> extra += ",vfs.root.mountfrom=ufs:/dev/xbd768a"
> <...>

sorry, I sent the mail before finishing:

once I type ? at the mount root prompt type, I get:

mountroot> ?

List of GEOM managed disk devices:
  xbd1cs1d xbd1cs1c xbd1cs1a xbd1cs1 xbd1s1d xbd1s1c xbd1s1a xbd1c
xbd1a xbd1s1 xbd3 xbd2 xbd1

Manual root filesystem specification:
  <fstype>:<device>  Mount <device> using filesystem <fstype>
                       eg. ufs:da0s1a
  ?                  List valid disk boot devices
  <empty line>       Abort manual input

mountroot> bad stray interrupt

sometimes that 'bad stray interrupt' pops up.

once I type ufs:xbd1s1a I then get:

mountroot> ufs:xbd1bad stray interrupts1a
Trying to mount root from ufs:xbd1s1a
panic: vm_fault: fault on nofault entry, addr: c0877000
cpuid = 0
KDB: enter: panic
[thread pid 12 tid 100024 ]
Stopped at      kdb_enter+0x3a: movl    $0,kdb_why
db> bt
Tracing pid 12 tid 100024 td 0xc16a8cc0
kdb_enter(c0340eed,c0340eed,c0360502,cbe448ec,0,...) at kdb_enter+0x3a
panic(c0360502,c0877000,1,cbe44a0c,cbe449fc,...) at panic+0x12c
vm_fault(c0871000,c0877000,1,0,c0877fd0,...) at vm_fault+0x178
dblfault_handler() at dblfault_handler+0x551
--- trap 0x17, eip = 0, esp = 0, ebp = 0 ---

I tried both ufs:xbd1s1a and ufs:xbd1cs1a, I have managed to get
further than this.

I actually need to redo the file image as it is completely
un-configured in the sense of no fstab, etc.

to create the image I did:

# cd /tmp && truncate -s +1G xbd0
# mdconfig -a -f xbd0
# fdisk -i /dev/md0
# disklabel -wB /dev/md0s1 && disklabel -e /dev/md0s1
# mount /dev/md0s1a /dist
# cd /usr/src && make world distribution DESTDIR=/dist
# umount /dist && mdconfig -d -u 0

then transferred to my Xen dom0.

my config:
name = "bldr-fbsd32"
kernel = "/var/xen/" + name + "/kernel"
disk = [ 'file://var/xen/' + name + '/xbd0,0x01,w',
         'file://var/xen/' + name + '/xbd1,0x02,w',
         'file://var/xen/' + name + '/xbd2,0x03,w' ]
vif = [ 'mac=00:bd:c4:12:00:ef,bridge=bridge0' ]
memory = 256
on_crash = 'preserve'
#extra = "boot_verbose"
extra = "boot_single"
extra += "vfs.root.mountfrom=ufs:/dev/xbd1s1a"
extra += ",kern.hz=100"


Best regards,

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