[Qemu-devel] [Bug 595438] Re: KVM segmentation fault, using SCSI+writeback and linux 2.4 guest

[Коренберг Марк]

(gdb) run
Starting program: /usr/bin/kvm -M pc-0.12 -enable-kvm -m 256 -smp 1 -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
[Thread debugging using libthread_db enabled]
[New Thread 0xb7145b70 (LWP 4715)]
pci_add_option_rom: failed to find romfile "pxe-rtl8139.bin"
[New Thread 0xa54c4b70 (LWP 4747)]
scsi-disk: Tag 0x0 already in use

Program received signal SIGSEGV, Segmentation fault.
0x08468b10 in ?? ()
(gdb) bt
#0  0x08468b10 in ?? ()
#1  0x080f0ef6 in ?? ()
#2  0x080d4cf9 in ?? ()
#3  0x080c470f in ?? ()
#4  0x080c47c7 in ?? ()
#5  0x08052266 in ?? ()
#6  0x0806dcc4 in ?? ()
#7  0x08055465 in ?? ()
#8  0xb7a42bd6 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#9  0x0804ec51 in ?? ()
(gdb) 


address@hidden:~/src/KVM$ pmap 4712
4712:   /usr/bin/kvm -M pc-0.12 -enable-kvm -m 256 -smp 1 -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
08048000   2064K r-x--  /usr/bin/qemu-system-x86_64
0824c000      4K r----  /usr/bin/qemu-system-x86_64
0824d000     76K rw---  /usr/bin/qemu-system-x86_64
08260000   3408K rw---    [ anon ]
085b4000     64K rw---    [ anon ]


It seems, that 0x0804ec51 is in anonymous memory, does not it ?


I will try to use debug libraries. Please write how I can help more.

-- 
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.