Re: kvm-85rc5 Segmentation fault for m >= 2046 GB

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On Sun, Apr 12, 2009 at 06:14:12PM -0400, Donald Parsons wrote:
> Required info:
>  Intel Core 2 Duo E6600
>  kvm version kvm-85rc5 seg faults (rc[13] fine; rc[24]?)
>  Host kernel version: 2.6.29.1 SMP x86_64 (on Fedora 10)
>  Guest: Fedora 11 beta x86_64 (host and guest updated)
>  qemu cmd line:
>   /usr/local/kvm/bin/qemu-system-x86_64 fc11Beta.img -m 2048 &
>  Problem still present with either of -no-kvm-irqchip or
>     -no-kvm-pit switch
>  Problem also appears with the -no-kvm switch
> 
> In trying to make the core file smaller I found the
> seg fault disappeared for anything less than 2048
> and still appeared for other values above 2048.
> (Interesting thing, m=2046 and 2047 got a little further, window
> changed size before seg fault).  Everything up to 2045
> worked.
> Seg fault occurs quite early, last thing seen is:
>   "Press F12 for boot menu"
> followed by segfault about 3.5 to 4 seconds later.
> 
> Seems to be a problem with http://www.linux-kvm.org/page/Bugs
> where it says about core files "Then get a backtrace of
> the error with"  followed by nothing?

# gdb -c core.xxx qemu/x86_64-softmmu/qemu-system-x86_64

(gdb) bt 

Yes, the page is missing information, will be fixed.

> 
> dmesg shows:
> 
> (these for m>=2048)
> qemu-system-x86[9392] general protection ip:43c8e9 sp:7fffdfd955d0
> error:0 in qemu-system-x86_64[400000+1f2000]
> qemu-system-x86[9394] general protection ip:43c8e9 sp:7fffee13e970
> error:0 in qemu-system-x86_64[400000+1f2000]
> qemu-system-x86[9462] general protection ip:43c8e9 sp:7fff21ce3510
> error:0 in qemu-system-x86_64[400000+1f2000]
> qemu-system-x86[9522] general protection ip:43c8e9 sp:7fff7b4d4d10
> error:0 in qemu-system-x86_64[400000+1f2000]
> qemu-system-x86[9525] general protection ip:43c8e9 sp:7fff11aba2f0
> error:0 in qemu-system-x86_64[400000+1f2000]
> 
> (next one  m=2046)
> qemu-system-x86[9540] general protection ip:43c8f4 sp:7fffd6020850
> error:0 in qemu-system-x86_64[400000+1f2000]
> (next one  m=2047)
> qemu-system-x86[9314] general protection ip:43c8f4 sp:7fffdcfe1810
> error:0 in qemu-system-x86_64[400000+1f2000]
> 
> Don
> 
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