[Qemu-devel] [Bug 1067517] Re: qemu dosn't save snapshots with the 'commit' command

[Thomas Huth]

Triaging old bug tickets ... Can you still reproduce this problem with
the latest version of QEMU (currently version 2.9.0)?

** Changed in: qemu
       Status: New => Incomplete

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Title:
  qemu dosn't save snapshots with the 'commit' command

Status in QEMU:
  Incomplete

Bug description:
  Usually there is the 'commit' command in qemu which is described as followed: 
"commit changes to the disk images (if -snapshot is used) or backing files"
  From the context i though if i start a guest with the "-snapshot" option, the 
commit command would save all the changes back to the file. I've tried it out 
but i didn't get it to work. I tried a few things like first use savevm or stop 
and than commit all, but actually nothing works.
  Interestingly, when using qcow2 files qemu doesn't show's any error at all. 
The changes in the guest just won't get saved. But if i'm using lvm2 partitions 
i would get I/O errors after execute 'commit all'. That's probably because lvm2 
doesn't support this feature.?!? However i made a attachment which shows the 
error's in the guest (dmesg).

  Right now i started the guest with following command:
  /usr/bin/qemu-system-x86_64 -name g64 -runas kvm -m 4096 -smp 2 \
  -monitor unix:/var/run/kvm/g64.sock,server,nowait -pidfile 
/var/run/kvm/g64.pid -daemonize -snapshot \
  -device virtio-serial -chardev spicevmc,id=vdagent,name=vdagent \
  -device virtserialport,chardev=vdagent,name=com.redhat.spice.0 \
  -drive file=/media/btrfs/g64.qcow2,if=virtio,cache=none,aio=threads \
  -netdev type=tap,id=g64_3,vhost=on,ifname=qtap3,script=no,downscript=no \
  -device virtio-net-pci,netdev=g64_3,mac=DE:AD:BE:EF:CB:22 \
  -spice port=5803,addr=192.168.2.60,password=secret -k de -cpu host \
  -usb -usbdevice tablet -vga qxl

  The system is stable gentoo:
  Portage 2.1.11.9 (default/linux/amd64/10.0/no-multilib, gcc-4.5.4, 
glibc-2.15-r2, 3.4.9-gentoo x86_64)
  =================================================================
                          System Settings
  =================================================================
  System uname: address@hidden
  Timestamp of tree: Tue, 16 Oct 2012 03:45:01 +0000
  app-shells/bash:          4.2_p37
  dev-lang/python:          2.7.3-r2, 3.2.3
  dev-util/cmake:           2.8.8-r3
  dev-util/pkgconfig:       0.27.1
  sys-apps/baselayout:      2.1-r1
  sys-apps/openrc:          0.9.8.4
  sys-apps/sandbox:         2.5
  sys-devel/autoconf:       2.68
  sys-devel/automake:       1.11.6
  sys-devel/binutils:       2.22-r1
  sys-devel/gcc:            4.5.4
  sys-devel/gcc-config:     1.7.3
  sys-devel/libtool:        2.4-r1
  sys-devel/make:           3.82-r3
  sys-kernel/linux-headers: 3.4-r2 (virtual/os-headers)
  sys-libs/glibc:           2.15-r2
  Repositories: gentoo x-local x11 sunrise virtualization
  ACCEPT_KEYWORDS="amd64"
  ACCEPT_LICENSE="* address@hidden"
  CBUILD="x86_64-pc-linux-gnu"
  CFLAGS="-O2 -pipe -march=native -fopenmp"
  CHOST="x86_64-pc-linux-gnu"
  CONFIG_PROTECT="/etc /usr/share/openvpn/easy-rsa"
  CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d 
/etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild 
/etc/sandbox.d /etc/terminfo"
  CXXFLAGS="-O2 -pipe -march=native -fopenmp"
  DISTDIR="/usr/portage/distfiles"
  FCFLAGS="-O2 -pipe"
  FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks 
ebuild-locks fixlafiles news parallel-fetch parse-eapi-ebuild-head 
protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs 
unmerge-orphans userfetch"
  FFLAGS="-O2 -pipe"
  GENTOO_MIRRORS="        http://gentoo.supp.name/                              
  http://ftp.fi.muni.cz/pub/linux/gentoo/                         
http://gentoo.mirror.web4u.cz/                          
http://gentoo.mirror.dkm.cz/pub/gentoo/                         
http://gentoo.ynet.sk/pub";
  LANG="de_DE.utf8"
  LDFLAGS="-Wl,-O1 -Wl,--as-needed -fopenmp"
  LINGUAS="en"
  MAKEOPTS="-j12"
  PKGDIR="/usr/portage/packages"
  PORTAGE_CONFIGROOT="/"
  PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times 
--compress --force --whole-file --delete --stats --human-readable --timeout=180 
--exclude=/distfiles --exclude=/local --exclude=/packages"
  PORTAGE_TMPDIR="/var/tmp"
  PORTDIR="/usr/portage"
  PORTDIR_OVERLAY="/home/clown/public/overlays/local 
/home/clown/public/overlays/layman/x11 
/home/clown/public/overlays/layman/sunrise 
/home/clown/public/overlays/layman/virtualization"
  SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage/"
  USE="acl acpi amd64 berkdb bzip2 cli cracklib crypt cups cxx dbus dri fortran 
gdbm gif gpm iconv ipv6 mmx modules mudflap ncurses nls nptl openmp pam pbm 
pcre png pppd readline session sqlite sse sse2 ssl ssse3 tcpd threads unicode 
zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci 
emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m 
maestro3 trident usb-audio via82xx via82xx-modem ymfpci" 
ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file 
hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug 
rate route share shm softvol" APACHE2_MODULES="authn_core authz_core 
socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm 
authn_default authn_file authz_dbm authz_default authz_groupfile authz_host 
authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir 
disk_cache env expires ext_filter file_cache filter headers include info 
log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling 
status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words 
flow plan sheets stage tables krita karbon braindump" CAMERAS="ptp2" 
COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" 
ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin 
garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore 
rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" 
INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz 
cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" 
LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en" 
PHP_TARGETS="php5-3" PYTHON_TARGETS="python3_2 python2_7" 
QEMU_SOFTMMU_TARGETS="i386 x86_64" QEMU_USER_TARGETS="i386 x86_64" 
RUBY_TARGETS="ruby18 ruby19" SANE_BACKENDS="niash" USERLAND="GNU" 
VIDEO_CARDS="fbdev glint intel mach64 mga nouveau nv r128 radeon savage sis 
tdfx trident vesa via vmware dummy v4l" XTABLES_ADDONS="quota2 psd pknock lscan 
length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq 
steal rawnat logmark ipmark dhcpmac delude chaos account"
  Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, 
PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, 
PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON

  =================================================================
                          Package Settings
  =================================================================

  app-emulation/qemu-1.1.1-r1 was built with the following:
  USE="aio caps curl ncurses sasl spice vde vhost-net -alsa -bluetooth -brltty 
-debug -doc -fdt -opengl -pulseaudio -python -rbd -sdl -smartcard -static -tci 
-tls -usbredir -virtfs -xattr -xen -xfs" QEMU_SOFTMMU_TARGETS="i386 x86_64 
(-alpha) (-arm) -cris (-m68k) -microblaze -microblazeel (-mips) -mips64 
-mips64el -mipsel (-ppc) (-ppc64) -ppcemb -s390x -sh4 -sh4eb (-sparc) -sparc64 
-xtensa -xtensaeb" QEMU_USER_TARGETS="i386 x86_64 (-alpha) (-arm) -armeb -cris 
(-m68k) -microblaze -microblazeel (-mips) -mipsel (-ppc) (-ppc64) -ppc64abi32 
-s390x -sh4 -sh4eb (-sparc) -sparc32plus -sparc64 -unicore32"

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