I originally sent this message to freebsd-current.  Got no response, perhaps
freebsd-xen is a better mailing list. (-:

Since the end of August I have been unable to boot a generic kernel from
FreeBSD current or 8 under XEN 5.5.0.  Finally had a chance to briefly look
at the problem.  If I apply attached patch to remove calls to clflush() I
am able to boot current.  Hopefully somebody can shed some light.  Is
XEN incorrecty reporting CPUID_CLFSH or is XEN not correctly virtualizing
this option.  Or is the issue someplace else?  I have also attached the
dmesg from a successful boot.  This issue seems to be same as
http://www.freebsd.org/cgi/query-pr.cgi?pr=138863


Here is an attempt to type backtrace from non-booting kernel:

pmap_invalidate_cache_range(c3252000,c3253000,c3253000,0,fee00000,...) at
+pamp_invalidate_cache_range+0x60
pmap_mapdev_attr(fee00000,400,0,c1420d34,c0ba7a72,...) at pmap_mapdev_attr+0xec
pmap_mapdev() at pmap_mapdev+0x20
lapic_init() at lapic_init+0x32
madt_setup_local() at madt_setup_local+0x2c
apic_init() at apic_init+0x11a
mistartup() at mi_startup+0x96
begin() at begin+0x2c

Larry

-- 
------------------------------------------------------------------------
Larry Baird                        | http://www.gta.com
Global Technology Associates, Inc. | Orlando, FL
Email: l...@gta.com                 | TEL 407-380-0220, FAX 407-380-6080
--- pmap.c.orig	2009-09-21 11:14:53.000000000 -0400
+++ pmap.c	2009-09-21 11:15:01.000000000 -0400
@@ -992,9 +992,10 @@
 	KASSERT((eva & PAGE_MASK) == 0,
 	    ("pmap_invalidate_cache_range: eva not page-aligned"));
 
-	if (cpu_feature & CPUID_SS)
+	if (cpu_feature & CPUID_SS) {
 		; /* If "Self Snoop" is supported, do nothing. */
-	else if (cpu_feature & CPUID_CLFSH) {
+#ifdef MAYBE_09_21_2009
+	} else if (cpu_feature & CPUID_CLFSH) {
 
 		/*
 		 * Otherwise, do per-cache line flush.  Use the mfence
@@ -1007,6 +1008,7 @@
 		for (; sva < eva; sva += cpu_clflush_line_size)
 			clflush(sva);
 		mfence();
+#endif // MAYBE_09_21_2009
 	} else {
 
 		/*
Copyright (c) 1992-2009 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 9.0-CURRENT #2: Mon Sep 21 11:00:46 EDT 2009
    l...@sw-xenoss.gta.com:/usr/src/sys/i386/compile/GENERIC
WARNING: WITNESS option enabled, expect reduced performance.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(R) CPU            5110  @ 1.60GHz (1691.83-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x6fb  Stepping = 11
  
Features=0x789fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CLFLUSH,MMX,FXSR,SSE,SSE2>
  Features2=0x80002201<SSE3,SSSE3,CX16,<b31>>
  AMD Features=0x20000000<LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant
real memory  = 536870912 (512 MB)
avail memory = 493977600 (471 MB)
ACPI APIC Table: <Xen HVM>
ioapic0: Changing APIC ID to 1
MADT: Forcing active-low polarity and level trigger for SCI
ioapic0 <Version 1.1> irqs 0-47 on motherboard
kbd1 at kbdmux0
acpi0: <Xen> on motherboard
acpi0: [ITHREAD]
Timecounter "ACPI-safe" frequency 3579545 Hz quality 850
acpi_timer0: <32-bit timer at 3.579545MHz> port 0x1f48-0x1f4b on acpi0
acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 62500000 Hz quality 900
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
isab0: <PCI-ISA bridge> at device 1.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX3 WDMA2 controller> port 
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xc220-0xc22f at device 1.1 on pci0
ata0: <ATA channel 0> on atapci0
ata0: [ITHREAD]
ata1: <ATA channel 1> on atapci0
ata1: [ITHREAD]
uhci0: <Intel 82371SB (PIIX3) USB controller> port 0xc200-0xc21f irq 23 at 
device 1.2 on pci0
uhci0: [ITHREAD]
uhci0: LegSup = 0x0000
usbus0: controller did not stop
usbus0: <Intel 82371SB (PIIX3) USB controller> on uhci0
pci0: <bridge> at device 1.3 (no driver attached)
vgapci0: <VGA-compatible display> mem 
0xf0000000-0xf1ffffff,0xf3000000-0xf3000fff at device 2.0 on pci0
pci0: <mass storage, SCSI> at device 3.0 (no driver attached)
re0: <RealTek 8139C+ 10/100BaseTX> port 0xc100-0xc1ff mem 0xf3001000-0xf30010ff 
irq 32 at device 4.0 on pci0
re0: Chip rev. 0x74800000
re0: MAC rev. 0x00000000
miibus0: <MII bus> on re0
rlphy0: <RealTek internal media interface> PHY 0 on miibus0
rlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
re0: Ethernet address: 4e:c4:60:ce:d0:72
re0: [FILTER]
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: [ITHREAD]
psm0: model IntelliMouse Explorer, device ID 4
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: does not respond
device_attach: fdc0 attach returned 6
uart0: <Non-standard ns8250 class UART with FIFOs> port 0x3f8-0x3ff irq 4 flags 
0x10 on acpi0
uart0: [FILTER]
ppc0: <Parallel port> port 0x378-0x37f irq 7 on acpi0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppc0: [ITHREAD]
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
plip0: [ITHREAD]
lpt0: <Printer> on ppbus0
lpt0: [ITHREAD]
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
cpu0: <ACPI CPU> on acpi0
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: does not respond
device_attach: fdc0 attach returned 6
pmtimer0 on isa0
orm0: <ISA Option ROM> at iomem 0xd0000-0xd7fff pnpid ORM0000 on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 1691834274 Hz quality 800
Timecounters tick every 10.000 msec
usbus0: 12Mbps Full Speed USB v1.0
ad0: 20480MB <QEMU HARDDISK 0.9.1> at ata0-master WDMA2
ugen0.1: <Intel> at usbus0
uhub0: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
GEOM: ad0s1: geometry does not match label (255h,63s != 16h,63s).
uhub0: 2 ports with 2 removable, self powered
ugen0.2: <QEMU 0.9.1> at usbus0
ums0: <Endpoint1 Interrupt Pipe> on usbus0
ums0: 3 buttons and [Z] coordinates ID=0
acd0: CDROM <QEMU DVD-ROM/0.9.1> at ata1-slave WDMA2
WARNING: WITNESS option enabled, expect reduced performance.
Trying to mount root from ufs:/dev/ad0s1a
lock order reversal: (sleepable after non-sleepable)
 1st 0xc390a058 rtentry (rtentry) @ net/route.c:1409
 2nd 0xc0f433b8 ifnet_sx (ifnet_sx) @ netinet/sctp_bsd_addr.c:211
KDB: stack backtrace:
db_trace_self_wrapper(c0c828bc,d6957788,c08c2725,c08b354b,c0c85715,...) at 
db_trace_self_wrapper+0x26
kdb_backtrace(c08b354b,c0c85715,c35286e8,c352c8b8,d69577e4,...) at 
kdb_backtrace+0x29
_witness_debugger(c0c85715,c0f433b8,c0c8e50e,c352c8b8,c0c9865e,...) at 
_witness_debugger+0x25
witness_checkorder(c0f433b8,1,c0c98655,d3,0,...) at witness_checkorder+0x839
_sx_slock(c0f433b8,0,c0c98655,d3,d6957878,...) at _sx_slock+0x85
sctp_init_ifns_for_vrf(3,c39018c0,d69578c0,c08c3178,c3901964,...) at 
sctp_init_ifns_for_vrf+0x30
sctp_addr_change(c38ffa00,1,d69578c0,c08c256c,d695791c,...) at 
sctp_addr_change+0x2c
rt_newaddrmsg(1,c38ffa00,0,c390a000,c38ffa00,...) at rt_newaddrmsg+0x3f
rtinit(c38ffa00,1,5,c0de9cfc,51573592,...) at rtinit+0x381
in_ifinit(0,c0c96ee7,1aa,1a6,c3814800,...) at in_ifinit+0x8f6
in_control(c38f7000,8040691a,c3907dc0,c3814800,c39018c0,...) at in_control+0xccb
ifioctl(c38f7000,8040691a,c3907dc0,c39018c0,c38ff200,...) at ifioctl+0x14f0
soo_ioctl(c385f540,8040691a,c3907dc0,c356e100,c39018c0,...) at soo_ioctl+0x415
kern_ioctl(c39018c0,3,8040691a,c3907dc0,8bc060,...) at kern_ioctl+0x1fd
ioctl(c39018c0,d6957cf8,c,c0c96f81,c0d665c8,...) at ioctl+0x134
syscall(d6957d38) at syscall+0x2a3
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (54, FreeBSD ELF32, ioctl), eip = 0x281bf513, esp = 0xbfbfe61c, ebp 
= 0xbfbfe658 ---
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