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[Qemu-devel] [Bug 595438] Re: KVM segmentation fault, using SCSI+writeba


From: Коренберг Марк
Subject: [Qemu-devel] [Bug 595438] Re: KVM segmentation fault, using SCSI+writeback and linux 2.4 guest
Date: Fri, 02 Jul 2010 07:24:13 -0000

(gdb) bt
#0  0x00000202 in ?? ()
#1  0x080f362c in ?? ()
#2  0x080f0f16 in ?? ()
#3  0x080d4d19 in ?? ()
#4  0x080c472f in ?? ()
#5  0x080c47e7 in ?? ()
#6  0x08052266 in ?? ()
#7  0x0806dcc4 in ?? ()
#8  0x08055465 in ?? ()
#9  0xb7a42bd6 in __libc_start_main (main=0x8053f20, argc=14, 
ubp_av=0xbffff3e4, init=0x81f0480, fini=0x81f0470, 
    rtld_fini=0xb7ff10c0 <_dl_fini>, stack_end=0xbffff3dc) at libc-start.c:226
#10 0x0804ec51 in ?? ()

nothing interesting after installing debug libraries. What to do next?
(kvm has been upgraded o latest in ubuntu, addresses has been changed in output)

-- 
KVM segmentation fault, using SCSI+writeback and linux 2.4 guest
https://bugs.launchpad.net/bugs/595438
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Status in QEMU: New

Bug description:
I Use Ubuntu 32 bit 10.04 with standard KVM.
I have Intel E7600  @ 3.06GHz processor with VMX

In this system I Run:
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin 
QEMU_AUDIO_DRV=none /usr/bin/kvm -M pc-0.12 -enable-kvm -m 256 -smp 1 -name 
spamsender -uuid b9cacd5e-08f7-41fd-78c8-89cec59af881 -chardev 
socket,id=monitor,path=/var/lib/libvirt/qemu/spamsender.monitor,server,nowait 
-monitor chardev:monitor -boot d -drive 
file=/mnt/megadiff/cdiso_400_130.iso,if=ide,media=cdrom,index=2 -drive 
file=/home/mmarkk/spamsender2.img,if=scsi,index=0,format=qcow2,cache=writeback 
-net nic,macaddr=00:00:00:00:00:00,vlan=0,name=nic.0 -net tap,vlan=0,name=tap.0 
-chardev pty,id=serial0 -serial chardev:serial0 -parallel none -usb -vnc 
127.0.0.1:0 -vga cirrus

.iso image contain custom distro of 2.4-linux kernel based system. During 
install process (when .tar.gz actively unpacked), kvm dead with segmentation 
fault.

And ONLY when I choose scsi virtual disk and writeback simultaneously. 
But, writeback+ide, writethrough+scsi works OK.

I use qcow2. It seems, that qcow does not have such problems.

Virtual machine get down at random time during file copy. It seems, when qcow2 
file size need to be expanded.







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