registry team mailing list archive

[Serge Hallyn <595438@xxxxxxxxxxxxxxxxxx>]

** Description changed:

  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. 
+ 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.
+ 
+ IMPACT: kvm used with scsi virtual disk and writeback dies with
+ segfault.
+ 
+ FIX: is the inclusion of a patch cherry-picked from upstream which dequeues
+ requests before invoking callbacks.  It is at
+ http://bazaar.launchpad.net/~serge-hallyn/ubuntu/lucid/qemu-kvm/fix-scsi-writeback/revision/70
+ 
+ TO REPRODUCE: See the command above.
+ 
+ REGRESSION POTENTIAL: this is cherry-picked from upstream, and has been
+ tested by the bug reporter with no ill effects.

** Changed in: qemu
       Status: Fix Committed => Fix Released

** Changed in: qemu
       Status: Fix Released => Fix Committed

** Changed in: qemu-kvm
       Status: Confirmed => Fix Released

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