[Qemu-devel] reproducable triple-faults

[Qemu-devel] reproducable triple-faults

[Rick Vernam]

stop here if you are not interested in problems on 'unsupported gcc4' ...
this is way out of my forte, so I guess reporting is second best to fixing?

Running on an athlon64 2.4ghz (64-bit linux 2.6.25)...
If I am using a power-saving mode which slows the processor down (conservative 
govener, typically at 800mhz), a windows xp virtual machine will triple fault 
seemingly invariably.  As soon as I crank it up to performance govener, qemu 
runs just great.
I assume this problem can be attributed to gcc4.  It's been hapening for quite 
some time, but only recently have I attributed this triple fault to the use 
of power-saving modes.

gcc --version: gcc (GCC) 4.1.2 (Gentoo 4.1.2 p1.0.1)

qemu: fatal: triple fault
EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000000
ESI=00000000 EDI=00000000 EBP=00000000 ESP=804d7000
EIP=8053f840 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0023 00000000 ffffffff 00cff300
CS =0008 00000000 ffffffff 00cf9a00
SS =0010 00000000 ffffffff 00cf9300
DS =0023 00000000 ffffffff 00cff300
FS =0030 ffdff000 00001fff ffc093df
GS =0000 00000000 00000000 00000000
LDT=0000 00000000 00000000 00000000
TR =0050 80549300 00000068 80008954
GDT=     8003f000 000003ff
IDT=     8003f400 000007ff
CR0=e001003d CR2=804d6ffc CR3=002e4000 CR4=00000020
CCS=00000000 CCD=8053f434 CCO=EFLAGS
FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
XMM00=00000000000000000000000000000000 XMM01=00000000000000000000000000000000
XMM02=00000000000000000000000000000000 XMM03=00000000000000000000000000000000
XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000
XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000
/usr/bin/wxp.sh: line 6:  5228 Aborted                 
qemu-system-x86_64 -kernel-kqemu -hda wxp.qc2 -m 384 -name WinXP -net 
nic,model=e1000 -net 
tap,script=/etc/qemu-ifup -localtime -soundhw ,es1370, -std-vga

While I have not tracked the values of the various registers for more than 4 
or 5 triple-faults, they were the same each time.

Is there additional information that you might find useful?

Re: [Qemu-devel] reproducable triple-faults

[Rick Vernam]

On Monday 05 May 2008 07:56:30 pm Rick Vernam wrote:
[snip]
> (conservative govener, typically at 800mhz), a windows xp virtual machine
> will triple fault seemingly invariably.
it triple faults during boot.  forgot that detail...
I don't know much about exactly how windows boots, but the fault is always 
just before the fancy windows xp boot screen.