I¹m running SXCE b87 on a couple of Dells in an xVM cluster, and I just
experienced this dom0 panic:

Jun  5 15:52:33 lab-xvm-00-a genunix: [ID 556024 kern.notice]
page_get_pagecnt: out of range 6
Jun  5 15:52:33 lab-xvm-00-a unix: [ID 100000 kern.notice]
Jun  5 15:52:33 lab-xvm-00-a genunix: [ID 655072 kern.notice]
ffffff003c4e6d80 unix:page_get_pagecnt+38 ()
Jun  5 15:52:33 lab-xvm-00-a genunix: [ID 655072 kern.notice]
ffffff003c4e6de0 unix:page_next_scan_large+4e ()
Jun  5 15:52:33 lab-xvm-00-a genunix: [ID 655072 kern.notice]
ffffff003c4e6e60 genunix:fsflush_do_pages+c2 ()
Jun  5 15:52:33 lab-xvm-00-a genunix: [ID 655072 kern.notice]
ffffff003c4e6ef0 genunix:fsflush+3b3 ()
Jun  5 15:52:33 lab-xvm-00-a genunix: [ID 655072 kern.notice]
ffffff003c4e6f00 unix:thread_start+8 ()
Jun  5 15:52:33 lab-xvm-00-a unix: [ID 100000 kern.notice]
Jun  5 15:52:33 lab-xvm-00-a genunix: [ID 672855 kern.notice] syncing file
systems...
Jun  5 15:52:33 lab-xvm-00-a unix: [ID 836849 kern.notice]
Jun  5 15:52:33 lab-xvm-00-a ^Mpanic[cpu3]/thread=ffffff08e8f4d460:
Jun  5 15:52:33 lab-xvm-00-a genunix: [ID 335743 kern.notice] BAD TRAP:
type=e (#pf Page fault) rp=fffffffffbc960e0 addr=9 occurred in module "unix"
due to a NULL pointer dereference

This is a Dell 2970 dual Opteron 2220 dual core system with 32G of RAM. The
dom0 network interfaces include onboard bnx and an add-in e1000 (Intel
1000-PT).

DomUs that were running at the time:
* about a dozen 64bit paravirt Ubuntu Hardy (8.04) domU guests running with
the XenSource 2.4.18 vmlinuz kernel from the Xen 3.1 x86_64 binary tarball
* one SXCE b85 paravirt domU

The guests were all idle. Primarily playground/development guests with
nobody using them at the time.

Of the 32G of memory, only 12G was in use by those guests at the time, the
dom0 still had 19G of memory unallocated (balloon).

The domUs are all running on iSCSI devices exposed by the dom0¹s initiator,
as exposed from another Dell 2970 acting as an iSCSI server (zfs zvols,
iscsishare=on).

This is all in a lab, of course, none of this is production.

Perhaps a b90 upgrade is in order. I¹m willing to give just about anything a
try.

 - Ian C. Blenke <[EMAIL PROTECTED]> <[EMAIL PROTECTED]>

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