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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 09:38:52 -0000

Yeah. I have compile non-stripped kvm binary.
(gdb) bt
#0  0x0852cd88 in ?? ()
#1  0x080f0f16 in scsi_command_complete (r=0x86252d8, status=<value optimized 
out>, sense=<value optimized out>)
    at /home/mmarkk/src/KVM/qemu-kvm-0.12.3+noroms/hw/scsi-disk.c:105
#2  0x080d4d19 in qcow_aio_write_cb (opaque=0x85e68b8, ret=0) at 
#3  0x080c472f in posix_aio_process_queue (opaque=0x846bd98) at 
#4  0x080c47e7 in posix_aio_read (opaque=0x846bd98) at posix-aio-compat.c:501
#5  0x08052266 in main_loop_wait (timeout=1000) at 
#6  0x0806dcc4 in kvm_main_loop () at 
#7  0x08055465 in main_loop (argc=14, argv=0xbffff3e4, envp=0xbffff420) at 
#8  main (argc=14, argv=0xbffff3e4, envp=0xbffff420) at 

KVM segmentation fault, using SCSI+writeback and linux 2.4 guest
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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 
-monitor chardev:monitor -boot d -drive 
file=/mnt/megadiff/cdiso_400_130.iso,if=ide,media=cdrom,index=2 -drive 
-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 -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 

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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