kern/180788: [xen] [panic] XEN PV kernel 9.2-BETA1 panics on boot

[Alexander Brovikov]

>Number:         180788
>Category:       kern
>Synopsis:       [xen] [panic] XEN PV kernel 9.2-BETA1 panics on boot
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jul 24 06:40:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Alexander Brovikov
>Release:        9.2-BETA1
>Organization:
>Environment:
FreeBSD 9.2-BETA1 #0: Wed Jul 24 06:06:39 YEKT 2013
    bas at freebsd92b1:/usr/obj/usr/src/sys/XEN i386
>Description:
XEN PV kernel (built from stock XEN conf file) 9.2-BETA1 panics on boot:

pid 25 (sh), uid 0: exited on signal 11
panic: removing pages from non-current pmap
cpuid = 0
KDB: enter: panic
[ thread pid 25 tid 100036 ]
Stopped at      kdb_enter+0x3a: movl    $0,kdb_why
db> 
db> bt
Tracing pid 25 tid 100036 td 0xc26f6bc0
kdb_enter(c04074b6,c04074b6,c044750f,ccb79944,0,...) at kdb_enter+0x3a/frame 0xccb7990c
panic(c044750f,0,c04465f7,e06,c01170c5,...) at panic+0x18c/frame 0xccb79938
pmap_remove_pages(c253e724,c04055fa,e8,0,c26f3000,...) at pmap_remove_pages+0x68c/frame 0xccb799b8
vmspace_exit(c26f6bc0,0,c04013a5,141,c0192e88,...) at vmspace_exit+0x90/frame 0xccb799d8
exit1(c26f6bc0,b,19,c26f320c,0,...) at exit1+0x62e/frame 0xccb79a28
sigexit(c26f6bc0,b,c0407561,b02,c05dd978,...) at sigexit+0xe43/frame 0xccb79c30
postsig(b,64,c040d916,fc,1,...) at postsig+0x20b/frame 0xccb79ce0
ast(ccb79d18) at ast+0x37f/frame 0xccb79d0c
vm86_biosret() at vm86_biosret+0x9c/frame 0xbf7fcc68
db> 
>How-To-Repeat:
Boot XEN PV kernel via pygrub on XenServer 6.2.
9.1-RELEASE in PV mode on same XS works well.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: