Bug 147250

panic: mutex vm page queue mutex not owned at /usr/src/sys/i386/xen/xen_machdep.c:409
cpuid = 0
KDB: enter: panic
[thread pid 7893 tid 100049 ]
Stopped at      kdb_enter+0x3a: movl    $0,kdb_why
db> where
Tracing pid 7893 tid 100049 td 0xc184d900
kdb_enter(c035e1a4,c035e1a4,c035c895,cc7efae0,0,...) at kdb_enter+0x3a
panic(c035c895,c03642bc,c038935d,199,cc7efb14,...) at panic+0x136
_mtx_assert(c054c044,4,c038935d,199,0,...) at _mtx_assert+0x87
_xen_queue_pt_update(31552320,1,328ab000,1,c038a9dd,...) at _xen_queue_pt_update+0x4c
pmap_extract(c19f4288,28202000,4,c035c91d,c19f4288,...) at pmap_extract+0x251
vm_fault_unwire(c19f41d8,28202000,28203000,0,0,...) at vm_fault_unwire+0x32
vm_map_delete(c19f41d8,1000,bf800000,1,c19f41d8,...) at vm_map_delete+0x16f
vm_map_remove(c19f41d8,1000,bf800000,0,c186d000,...) at vm_map_remove+0x51
vmspace_exit(c184d900,0,c0359432,12d,cc7efc90,...) at vmspace_exit+0xbf
exit1(c184d900,0,cc7efd3c,c03348a3,c184d900,...) at exit1+0x5db
sys_exit(c184d900,cc7efd08,4,c03649b8,c039cc9c,...) at sys_exit+0x1d
syscall(cc7efd48) at syscall+0x2a3
Xint0x80_syscall() at Xint0x80_syscall+0x22
--- syscall (1, FreeBSD ELF32, sys_exit), eip = 0x281000af, esp = 0xbf7fe74c, ebp = 0xbf7fe758 ---

How-To-Repeat: 1. Install FreeBSD paravirtualized DomU according to the HOWTO at:
http://forums.freebsd.org/showthread.php?t=10268


2. The only difference from the original HOWTO is guest disk based on real Linux LVM volume instead of file image.


3. Xen and Dom0 details
Linux xen0.vps 2.6.18-164.15.1.el5xen #1 SMP Wed Mar 17 12:04:23 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

CentOS release 5.4 (Final)

Xen version: 3.4.2


4. Log into FreeBSd DomU via ssh and run 'sysinstall' to install ports collection.


5. Enter /usr/ports/lang/ghc and run 'make'


6. The last STDOUT message is the following 'configure' string:
--
checking whether mlock is broken...
--

7. Check FreeBSD main console output