Re: Bug in running kvm

[Dor Laor <dor.laor-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

avadh patel wrote:
> Hello,
>
> Yesterday I compiled and installed kvm-55 release and I am not able to 
> get it working.
> When I try to run the qemu with following command:
>
>   $ qemu-system-x86_64 -hda vdisk.img -cdrom ubuntu_7.10_32.iso -boot 
> d -m 512
>
Please try with -no-kvm.
It is probably Intel's big real mode of the graphical boot splash.
If that the case please move to text boot loader and continue with kvm.
Regards,
Dor
> I got  some exception as shown below:
>
> exception 13 (33)
> rax 0000000000000469 rbx 0000000000800001 rcx 0000000000004300 rdx 
> 0000000000000000
> rsi 000000000005961d rdi 000000000005961c rsp 00000000fffaa9cc rbp 
> 000000000000200c
> r8  0000000000000000 r9  0000000000000000 r10 0000000000000000 r11 
> 0000000000000000
> r12 0000000000000000 r13 0000000000000000 r14 0000000000000000 r15 
> 0000000000000000
> rip 000000000000b04b rflags 00033006
> cs 4143 (00041430/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ds 4004 (00040040/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> es 4004 (00040040/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> ss 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> fs 3002 (00030020/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> gs 0000 (00000000/0000ffff p 1 dpl 3 db 0 s 1 type 3 l 0 g 0 avl 0)
> tr 0000 (20c00000/00002088 p 1 dpl 0 db 0 s 0 type b l 0 g 0 avl 0)
> ldt 0000 (00000000/0000ffff p 1 dpl 0 db 0 s 0 type 2 l 0 g 0 avl 0)
> gdt 40920/47
> idt 0/ffff
> cr0 60000010 cr2 0 cr3 0 cr4 0 cr8 0 efer 0
> code: 0f 17 3e 28 08 02 28 3e 01 17 0f 17 46 28 08 02 28 0e 01 17 --> 
> 0f 17 3e 28 08 02 28 5d 01 17 0f 28 08 02 28 5e 01 17 0f 17 3b 28 08 
> 02 28 5f 01 17 0f 28
> Aborted (core dumped)
>
> And a core file is generated.
>
> When i tried to see in the core file, the backtrace of function call 
> is as below:
>
> #0  0x00002b46cd3fb765 in raise () from /lib/libc.so.6
> #1  0x00002b46cd3fd1c0 in abort () from /lib/libc.so.6
> #2  0x00000000004f2cd3 in kvm_run (kvm=0x2a47040, vcpu=0) at libkvm.c:938
> #3  0x000000000048db96 in kvm_cpu_exec (env=0x53ce) at 
> /home/avadh/workspace/kvm-55/qemu/qemu-kvm.c:547
> #4  0x000000000048e1ae in kvm_main_loop_cpu (env=0x2ae8680) at 
> /home/avadh/workspace/kvm-55/qemu/qemu- kvm.c:748
> #5  0x000000000040dd27 in main_loop () at 
> /home/avadh/workspace/kvm-55/qemu/vl.c:7229
> #6  0x000000000040fd03 in main (argc=1, argv=0x2) at 
> /home/avadh/workspace/kvm-55/qemu/vl.c:8966
>
> In this, the interesting point is at #3, where the 'env' pointer's 
> value is different than its value in #4.
>
> If I run the above command with '-no-kvm' option, it runs perfectly. 
> So it seems that there is some bug in kvm.
>
> My machine specs are:
> OS : Ubuntu 7.10 - 64 bit
> Processor: Intel Core 2 Duo
> Memory : 2G
> Host Kernel : 2.6.22.14 <http://2.6.22.14>
>
> Thanks,
> Avadh


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