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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 10:09:20 -0000

void scsi_req_complete(SCSIRequest *req)
    assert(req->status != -1);
    req->bus->complete(req->bus, SCSI_REASON_DONE,

(gdb) bt 1
#0  0x0852cd88 in ?? ()
(More stack frames follow...)
(gdb) frame 1
#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
105         scsi_req_complete(&r->req);
(gdb) print r->req->bus->complete
$7 = (scsi_completionfn) 0x852cd88
(gdb) disassemble 0x852cd88
No function contains specified address.

Corrupted memory ?

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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