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[Qemu-devel] [Bug 917824] Re: qemu loops/hangs on extending qcow2-disksp
From: |
warum |
Subject: |
[Qemu-devel] [Bug 917824] Re: qemu loops/hangs on extending qcow2-diskspace |
Date: |
Thu, 19 Jan 2012 16:42:22 -0000 |
sorry forgot the requested cmdline of kvm:
kvm -mem-path /VM/tmp -S -M pc-0.12 -cpu qemu32 -enable-kvm -m 512 -smp
1,sockets=1,cores=1,threads=1 -name winxp -uuid
1c4f4992-9212-4b4c-a14d-25f2f3f28ed2 -nodefconfig -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/winxp.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=readline -rtc base=localtime -boot c
-device lsi,id=scsi0,bus=pci.0,addr=0x6 -drive
file=/VM/winxp/lw-c.img,if=none,id=drive-ide0-0-0,format=qcow2 -device
ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive
file=/VM/winxp/lw-t.img,if=none,id=drive-ide0-0-1,snapshot=on,format=qcow2
-device ide-drive,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -drive
file=/VM/winxp/lw-d.img,if=none,id=drive-ide0-1-1,format=qcow2 -device
ide-drive,bus=ide.1,unit=1,drive=drive-ide0-1-1,id=ide0-1-1 -drive
file=/VM/winxp/lw-p.img,if=none,id=drive-scsi0-0-0,format=qcow2 -device
scsi-disk,bus=scsi0.0,scsi-id=0,drive=drive-scsi0-0-0,id=scsi0-0-0 -netdev
tap,fd=13,id=hostnet0 -device
rtl8139,netdev=hostnet0,id=net0,mac=00:00:c1:a3:f4:45,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0
-usb -device usb-tablet,id=input0 -vnc 127.0.0.1:3 -vga std -device
AC97,id=sound0,bus=pci.0,addr=0x4 -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
the disk, on which the soft should be installed is that one on the
emulated scsi-controller
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https://bugs.launchpad.net/bugs/917824
Title:
qemu loops/hangs on extending qcow2-diskspace
Status in QEMU:
New
Status in “qemu-kvm” package in Ubuntu:
Incomplete
Bug description:
system is ubuntu 11-10 with qemu-kvm 0.14.1 (standard dpkg)
while trying to install a software in a winXP-guest on a nearly empty
disk within a qcow2-file, qemu stops answering console and vnc.
gdb on original binary shows, that it doesn't really hang, but seems
to endless loop
recompiling the binary with debugging-symbols shows following problem:
in block/qcow2-cluster.c:777 there's a loop over an allocation-list, but
instead of stopping somewhere, the "next" points to the current one.
QLIST_FOREACH(old_alloc, &s->cluster_allocs, next_in_flight) { ... }
because I'm not firm with qemu-development, I don't know, which
behaviour would be correct, but simply break this loop doesn't seem to
work: a few moments later the process is again at this point (tried so
by setting the register for comparison to 0)
this situation is continuosly reproducible, but it always take at
least 10-15min to get there, so please, if you have suggestion which I
should try and report, try to give as much suggestions as possible in
one action.
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