Download/criu/1.x

This page lists older (1.x) CRIU releases. For latest release, see Download/criu.

During 1.x stage of development, the project has already proven to be doable and we have concentrated on fulfilling its functionality, improving stability and performance.

v. 1.8

Tarball:	criu-1.8.tar.bz2
Version:	1.8
Released:	7 Dec 2015
GIT tag:	v1.8

New features

• Ability to check CRIU features via RPC
• New zdtm.py test suite
• Pre-dump and pre-restore action scripts
• The "info" action in CRIT showing stats about image file
• More user-friendly output by CRIT
• Python API -- pycriu
• Ability to add custom paths to irmap scan
• C/R of
  • read-only bind mounts
  • IPv6 routes and iptables rules
  • ip rules (it ip tool supports such)
  • ignore_routes_with_linkdown netns devconf
  • empty bridges in netns
  • FILTER mode of seccomp
  • IP_FREEBIND socket option

Optimizations/improvements

• Shared pie/non-pie .c files are built two times with proper flags
• VDSO code re-shuffled for better re-use between arches
• Failures of action scripts are reported in logs
• OpenVZ's VENET handling is tuned to fit the current kernel state
• Do not use hardcoded /dev/rts maj:min numbers
• Unsupported socket protocols are reported at expected place
• Slightly faster access to /proc files by using O_PATH open mode
• Improved page-server dump speed by keeping control over the Nagle algorithm
• Read pages.img in more optimal manner rather than page-by-page
• Less "Error"-s in logs, that actually don't lead to errors
• Slightly faster /proc/pid/status parsing
• Dead/live-locks on internal criu locks now emits a warning into logs

Fixes

• Page server flooded node with tw buckets during migration
• Turned off cgroups controllers weren't detected as such
• Netns sysctls from old images weren't properly restored
• Running process could be mistakenly stopped after --leave-running dump
• Helper processes run by CRIU produced fake error messages in logs
• Error code from sigaction restore could be missed
• Several potential buffers overruns due to missed '\0' after strcpy-s existed
• Killed processes after dump survived in zombie state for some time holding PIDs and resources
• If task had MANY children, the latter could be skipped on dump
• Task dying while being frozen could fail the dump
• On Aarch64 the upper limit for user memory was not properly detected sometimes
• Guess for TCP buffer max segment size was too optimistic (could fail the restore on low-mem machines)
• CRIT didn't decode userns images
• Ghost files were left in the FS tree after failed restore (blocking the next restore attempt)
• Some log messages from pie code were lost
• Some net/ipc/uts sysctls failed to restore in userns
• Move tasks int cgroups failed in userns
• Unsupported filesystems silently failed the dump
• External tmpfs (and some other) mounts generated tarballs with their contents
• Privately mapped files were picked from wrong mount namespace
• Controlling tty could be restored on wrong tty end
• Tmpfs mount of sub-namespace was restored from wrong image file
• Potential stack overflow in libcriu
• Partially-restored tasks could be left after failed restore
• In-container TCP connection sometimes failed to restore
• Race in sending SIGSTOP vs dump might cause dump to fail
• Post-restore actions could generate stats files in wrong directories
• Freeze-cgroup didn't take sub-cgroups' tasks into account
• Tentative state in IPv6 sockets binding prevented socket from being bound immediately
• Restoring from images with files pointing to /proc file of dead tasks could crash
• Tasks with STOP in queue (i.e. -- not yet stopped) were CONT-ed in case of --leave-running dump
• Stopped task with one more STOP in queue caused dump to stuck
• If parent task left the MNT namespace it created for children restore could BUG()
• Link-local IPv6 addresses sometimes failed to bind() at restore

Security

• Service run as root could allow users to violate ptrace policies
• Service run as root could give users access to privileged files and directories

v. 1.7.2

Tarball:	criu-1.7.2.tar.bz2
Version:	1.7.2
Released:	28 Oct 2015
GIT tag:	v1.7.2

Fixes

• Mounting container root on restore could sometimes switch to wrong root path
• The slave/shared option for CT root was lost on restore
• Duplicate slave mount points could appear on restore
• Fanotifies (inotifies) could be restored in wrong mount namespace (though on correct inode)
• Fanotifies (inotifies) on bind-mount-ed tmpfs file could fail the dump
• Kernel threads found in tree (OpenVZ containers case) blocked the dump
• Flat user namespace (0; \infty) restore failed
• Off-by-one in unix socket name handling
• IPC objects' UIDs and GIDs were not treated as userns ones
• Rcv and Snd buffers for sockets grew 2 times on restore

v. 1.7

Tarball:	criu-1.7.tar.bz2
Version:	1.7
Released:	7 Sep 2015
GIT tag:	v1.7

New features

• More flexible CGroups managing on restore
• Support for seccomp strict mode
• Support for stream unix sockets inheritance
• Support uid/gid-restricted mounts in userns
• Support deleted bind-mounts
• Freezer cgroups can be used on dump to freeze fast-spawning processes
• Ability to specify maximum ghost file size
• OverlayFS support
• Support relative unix sockets' bind paths
• In libcriu
  • New set of calls using non-global opts
  • Ability to pass existing connection to service
  • Ability to start criu in swrk mode for all requests
• Arch-specific improvements
  • Altivec and PSX support for PPC
  • Small PIE loader
  • Preparations for 32-bit x86

Optimizations/improvements

• Temporary proc mountpoint is mounted with nosuid, noexec and nodev
• Less memory copies when preparing restorer binary
• CRIT action "show" for less keystrokes on common use-case
• Fsnotify log messages now use hex everywhere :)
• CRIT output doesn't mix fields any more

Fixes

• CRIU binary couldn't be installed independently from man pages
• Root dir ignored in install: target
• Bug in restoring PPC floating point register
• SYSVIPC shmem was not attached on restore with PPC
• AIO ring ID was erroneously close()-d
• After dump+kill tasks remained in zombie states
• Race in zombies vs proc proxy tasks deaths resulted in restore spurious failure
• Restore got stuck when CRIU was called with blocked SIGCHILD
• Wrong page size value could be used on some ARM compilations
• Potential memory corruption when restoring an LSM profile
• Opened /dev/kmsg in WRONLY mode failed the restore
• Weird paths on tmpfs caused tar to fail
• Temporary cgroup mount set (cgyard) got propagated into the host tree
• Restore of inherited shared pipe failed
• Spaces, tabs and backslashes in mountpoints' paths caused dump to fail
• Tmpfs mounted with empty source caused dump to fail
• The criu.pc file contained bad version when built from tarball
• Deprecated -n option found in docs
• On aarch64 the maximum virtual address available for user-space was wrongly hardcoded

v. 1.6.1

Tarball:	criu-1.6.1.tar.bz2
Version:	1.6.1
Released:	12 Aug 2015
GIT tag:	v1.6.1

New features

• Support for relative paths for unix sockets

Fixes

• Crash when restoring netns from older images
• Race between unix sockets' connect and listen may cause restore to fail
• Multiple unix datagram clients restored server queue multiple times

v. 1.6

Tarball:	criu-1.6.tar.bz2
Version:	1.6
Released:	1 Jun 2015
GIT tag:	v1.6

New features

• PowerPC 64bit LE support
• Makefile.local for 3-rd party build rules
• Ability to "enable" filesystem on dump (--enable-fs)
• Ability to skip mountpoint on dump (--skip-mnt)
• Prepare to deprecate "criu show" command
• External mounts auto-detection
  • External siblings resolving
  • External sharing resolving
• /dev/tty (current terminal) support
• Netdev and netns (all/default) confs C/R
• Images v1.1 with extra magic at head
• Support fusectl (only ctl) mountpoint
• Sub-version format is now as of git-describe
• Apparamor labels C/R support

Optimizations

• Empty image files are not generated in image dir
• /proc/pid/fd/locks support for faster and non-intrusive locks dump

Fixes

• Cscope scanned symlinks on make tags
• Compilation with clang failed
• Improper PAGE_SIZE constant was used on Aarch64
• Selinux blocks attempt to inject parasite w/o any reasonable message
• Error code masked on some error paths
• O_APPEND files' changed size aborted restore
• Errno value could be overwritten by logging
• Mount namespace w/o /tmp could not be dumped
• Stats file generated in wrong dir sometimes
• MS_STRICTATIME mountpoint option was dropped on dump
• Read-only tmpfs mount failed to restore
• Some files were put into wrong places upon install target
• Service couldn't be enabled via systemd ctl after manual installation
• Parent's /proc/self files could be accessed by criu processes on restore
• When meeting unknown image file CRIT exited with exception instead of printing sane error message

v. 1.5.2

Tarball:	criu-1.5.2.tar.bz2
Version:	1.5.2
Released:	28 Apr 2015
GIT tag:	v1.5.2

Fixes

• Mutli-threaded tasks restored with error when --restore-sibling (Docker and LXC cases)
• Service (and swrk) couldn't receive too big RPC messages

v. 1.5.1

Tarball:	criu-1.5.1.tar.bz2
Version:	1.5.1
Released:	31 Mar 2015
GIT tag:	v1.5.1

New features

• Inheriting FDs now work in "swrk" RPC mode
• Restored pid is reported in post-restore RPC notification

Fixes

• Uninitialized ss in sigframe causes C/R failures on 4.0 kernel
• Cgroups' properties are initialized too late on restore
• Cgroups' destruction isn't performed in non detached mode
• Cgroups' destruction can fail on error paths

v. 1.5

Tarball:	criu-1.5.tar.bz2
Version:	1.5
Released:	2 Mar 2015
GIT tag:	v1.5

New features

• CRIT tool
• Ability to request CPU compatibility on instructions level only
• C/R of empty AIO rings
• More detailed errno report via RPC
• Per-feature "criu check"
• Inheriting FDs on restore
• Ability to automatically move veth device to host-side bridge on netns restore
• VT terminals support
• More user namespaces C/R stuff
  • Sockets full support
  • Invisible files
  • TTYs
  • FSnotifies

Optimizations

• TCP send queue is restored in the maximal portions allowed by the kernel
• Pre-loading sock-diag modules now happens in a more elegant way

Fixes

• Multi-threaded tasks on 64bit ARM could segfault upon restore
• When doing "check" CRIU could leave un-killed piggie task
• The --cpu-cap option argument was parsed with errors
• Incorrect handling of --cpu-cap fpu compatibility mode on restore
• Criu ignored trailing CLI arguments that resulted in usage confusions
• Irmap hints didn't include common "/" path
• When run per user request, CRIU left log and pid files belonging to root
• Mappings on AUFS could be looked up on wrong mount point
• Fixed compilation on Centos6.5
• Wrong /proc was used when reading the list of FDs to close on restore
• Race in restoring TCP established and listening sockets results in failed bind() on the latter
• Legacy ttys errorneously treated as unix98
• TTY pairs slavery setup could pick wrong peer
• For user-dump the log and pid files still belonged to root
• Task could die while being frozen thus causing dump to fail or save wrong task state
• Failures in mount points validation and sharing resolving didn't abort the dump (error arose on restore)

v. 1.4

Tarball:	criu-1.4.tar.bz2
Version:	1.4
Released:	1 Dec 2014
GIT tag:	v1.4

New features

• Dump and check cpuinfo. Needed to make sure CPU is capable to run the images after restore, e.g. during live migration
• Initial support for user namespaces
  • Use memfd to restore shared memory segments
  • New (slightly faster) API for mm stuff restore via prctl
  • [UG]ID-s are dumped from parasite, not from /proc files
• The docker_cr.sh script to show how Docker container C/R should (will) look like
• New API for writing plugins (old one is still possible)
• Service workers change their title to better look in ps output
• Ability to feed socket for pre-dump and page-server in swrk mode
• Page-server can auto-bind its port
• Ability to perform several actions during one connection to RPC service
• C/R of opened /proc/$pid/foo files of dead tasks
• C/R of /dev/console
• C/R of virtualized devtmpfs (openvz and future upstream kernels)
• C/R of empty mqueue fs (posix message queues)
• C/R of shared bind-mounts

Optimizations

• BFD engine
  • Faster that glibc's FILE * buffered read from /proc files
  • Buffered image files IO
• Faster parasite/restorer unload
  • Use HW breakpoints
  • Less ptrace GETREGS calls sometimes
  • Wake pie after sending the FINI command to socket
• Merged some pairs of images into one
  • eventpoll and -tfd
  • inotify and -wd
  • fsnotify and -mark
• Less setns()-s on dump is much faster on older kernels
• Faster access to /proc/self files -- cached fd of /proc/self and openat(this_cache)

Fixes

• Sibling restore mode didn't set up CRIU signals properly
• Unpredictable sibling/child root task restore. Fixed with explicit CLI option
• Validation for leaf mount points was skipped
• Mount options were corrupted on dump, which resulted in errors bind mounts detection
• Uninitialized properties of some cgroups prevented moving tasks into them (e.g. empty cpuset masks and low memcg limit)
• File locks could belong to task with different pid (inherited on fork) blocked the dump
• Bogus error printed in logs about SIGCHLD catch (was caused by thread dump using traps)
• Irmap engine accessed freed root_task on pre-dump
• Restore of net namespace could always fail (pid mismatch on fork) if kernel thread was created on netns setup
• Cgroups service descriptor was closed too early and failed restore
• Auto-loaded *diag modules caused audit netlink socket to contain data on dump (dump fails in this case)
• The "(deleted)" prefix accumulated in unlinked files while doing C/R
• The devpts filesystem and ptmx file were only dumped when found on /dev/pts and /dev respectively
• Data in netlink socket and fanotify was lost after C/R (now dump is aborted if data found in it)
• Fanotify mark was restore in different mount namespace
• Images were writable by group. Not secure when user-dump was requested
• Rootfs has parent id equal to self. CRIU didn't expect this and failed the dump
• Shared mount of the --root path failed the restore
• Absence (e.g. not compiled in) of any namespace in the kernel failed the dump
• Page-server incremental dump didn't detect new tasks properly and failed the stage
• Big TCP queues sometimes failed to get restored
• Incremental pre-dump could lose track of memory changes by task

v. 1.3.1

Tarball:	criu-1.3.1.tar.bz2
Version:	1.3.1
Released:	12 Sep 2014
GIT tag:	v1.3.1

Fixes

• Sibling restore mode didn't set up CRIU signals properly
• Unpredictable sibling/child root task restore. Fixed with explicit CLI option
• Validation for leaf mount points was skipped
• Mount options were corrupted on dump, which resulted in errors bind mounts detection

v. 1.3

Tarball:	criu-1.3.tar.bz2
Version:	1.3
Released:	1 Sep 2014
GIT tag:	v1.3

New features

• TimerFD support
• VVAR area (newer kernels' part of VDSO) support
• CGroups hierarchies support
• AUFS support (for Docker)
• PDeathSig support
• Check for opened file's size on dump and restore is the same
• Ability to restore tasks as children using libcriu (criu_restore_child)
• Add pkgconfig file for libcriu
• CRTOOLS_IMAGE_DIR variable available in action scripts

Optimizations

• Merged images with pending signal into core
• Per-task images with file locks are merged into one big image
• Smaller tasks orchestration memory area on restore
• Sigactions are inherited on restore when possible, not overwritten
• ZDTM suite now executes tests in parallel

Fixes

• Dump failed if robust lists were off
• Link remaps on tmpfs mounts were not dumped
• Non root tasks with custom groups couldn't dump its peers (Security)
• Opened and unlinked FIFOs, dirs and devices were restored as regular files
• Files opened from alien mount namespace were restored in the local one
• Link remap name sometimes was generated with error
• Opened and removed cwd couldn't be restored
• Sysctl kernel.msgmni was overwritten by subsequent auto_msgmni
• Library and RPC APIs didn't match the CLI one
• Some external mounts were constantly "postponed" and never got mounted
• The self.mm_dumpable prlctl value of 2 caused restore to fail
• Errors when writing sysctls with tail \n
• The criu show printed nested repeated fields corrupted
• Dump stats were initialized with garbage
• Restore sometimes stuck on waiting for inet socket port bind
• Spurious SIGHUP when restoring slave ttys
• Restore wasn't aborted if sub-task failed early

v. 1.3-rc2

Tarball:	criu-1.3-rc2.tar.bz2
Version:	1.3-rc2
Released:	18 Jun 2014
GIT tag:	v1.3-rc2

New features

• Native (w/o plugins) c/r of external bind mounts
• C/R of the info in which cgroups tasks live
• C/R of task's dumpable flag
• Dump pstore, securityfs, fusectl and debugfs mountpoints

Fixes

• VDSO was searched on stack's guard page
• Mount namespace w/o /proc mount blocked the restore
• Several misses in searching for COW VMA resulted in sub-optimal pages sharing on restore
• FIFO-s path was restored in wrong mount namespace
• Mountpoint fsnotify could be restored on a bind-mount
• One tmpfs mounted several times was dumped several times
• Bind-mount's root path of the top mount was calculated with error
• Fix device number calculation out of major:minor on some distros
• Devpts mount options got lost on dump
• Page-pipes grew endlessly resulting in dump failures on big VMAs
• IO and PF mappings were tried to be dumped
• Two merged MAP_GROWSDOWN VMAs got dumped with overlapping guard page
• Too small shared area was used to fetch tasks mappings that resulted in failed dump of huge mappings
• Many fixes in build system
• Zdtm's COW test sometimes ignored COW failures

v. 1.3-rc1

Tarball:	criu-1.3-rc1.tar.bz2
Version:	1.3-rc1
Released:	25 Apr 2014
GIT tag:	v1.3-rc1

New features

• AArch64
• Multiple mount namespaces
• FPU state restore control
  • Restore old FPU state on newer CPUs
  • Ability to ignore FPU restoration
• Support stopped multi-threaded tasks
• CRIU now can execv() other binary right after restore is complete
• Inode-reverse mapping can be enforced to allow live-migration with FS copying
• Gold linker can now be used to compile CRIU
• "Berserker" test to check CRIU scalability
• Punch pages from mem images on restore (optimizes live-migration)

Optimizations

• Batched deduplication of memory images
• Packed rlimits into core image
• Packed timers into core image

Fixes

• Bad checks for kcmp() ret codes resulted in errors in file sharing detection
• Multiple mmaps of same files with different flags blocked the restore
• Integer overflow in huge mapping restore caused restoration failure
• devpts's newinstance option was lost during dump
• Subsequent dump could try to find old mem dump for newly forked task
• Bad detection of overmounted mountpoints on fsnotify restore
• Page-server could read partial message and failed
• Errors in dumping of two subsequent anon VMAs in some cases
• Irmap mis-compared devices for disk FSs
• TMPFS handles always change during dump/restore
• Pre-dump sometimes hangs on FIFOs
• Post-restore script fails too late (if does it)

v. 1.2

Tarball:	criu-1.2.tar.bz2
Version:	1.2
Released:	26 Feb 2014
GIT tag:	v1.2

New features

• Performance improvements
  • Shared entries in reg-files image
  • Less accesses to /proc/$pid/map_files links
  • Cache for /proc/$pid/pagemap reads
  • VDSO page is seeked only in anonymous mappings
  • Task's auxv is read in one call
  • Merged mm and vma image files for better packing
  • NFS inodes' path resolution (for fsnotify) cache
  • One readlink() call when checking anon inodes
  • Don't dump kernel's zero-page
  • Parse fast /proc/self/maps when searching for hole for restorer
  • A bit faster write into image files with writev()
• Library versioning
• RPC API got closer to CLI
  • Suitable for live migration project
  • Action-scripts via RPC notification messages
• New "post-restore" call in action scripts
• Logrotate rules file
• Default log file for service when starting via systemd

Fixes

• A lot for ARM cross-compile
• Fsnotifies dumping didn't work on NFS
• Images auto-deduplication only worked one level up
• Packet socket ID was treated as file-descriptor and close()-d
• Badly counted pages stats on restore
• Linked remap name conflict when dump and restore on NFS
• Sporadic failures in memory draining due to huge pipes used
• Broken criu show of repeated fields
• Failure to open mountpoint in foreign pid namespace
• Unlinked bound unix socket dump error
• Small memory leak when writing to incremental image(s)
• Restoring fsnotify for links results in ELOOP
• Host's PATH is not suitable when execv-ing tar/ip/iptable to restore namespace (workaround, proper fix will be in 1.3)
• Using subdirs in log file name via RPC breaks security

v. 1.1

Tarball:	criu-1.1.tar.bz2
Version:	1.1
Released:	28 Jan 2014
GIT tag:	v1.1

Fixes

• Errors from memory dumping are not handled resulting in corrupted dumps
• EOF detection in stacked images is done with error
• Stacked images don't work on non-shared FS (missing pagemap-s)

v. 1.1-rc2

Tarball:	criu-1.1-rc2.tar.bz2
Version:	1.1-rc2
Released:	20 Jan 2014
GIT tag:	v1.1-rc2

Fixes

• Crash in criu check
• RPC check always fail on 3.11 kernel
• Failed fork() didn't abort restore
• Dump fail not reported via RPC
• RPC client disconnect wasn't handled
• Page server could connect to self for writing images
• Hang on pre-dumping task livig in net-namespace
• VDSO page mis-handle on pre-dump
• FPU state loss on pre-dump
• Memory tracking turns ON w/o request
• Various fixes (and improvements) in build system

v. 1.1-rc1

Tarball:	criu-1.1-rc1.tar.bz2
Version:	1.1-rc1
Released:	30 Dec 2013
GIT tag:	v1.1-rc1

New features

• libcriu.so -- wrapper library for RPC clients
• Plugins
  • External unix sockets
  • External bind mounts
  • External net devices
  • Unknown file types
• Images deduplication in incremental dumps
• Integration with systemd
• Filtering of criu show output

Note: The API defined in the first two items above may change after -rc1

Fixes

• Errors in unlinked files/sockets detection on BTRFS
• NFS silly-rename files are not treated as unlinked
• Freezer fail to seize quickly forking/pthread_create-ing tasks
• Extra stop signal queued for stopped tasks after pre-dump
• Wrong dying task state detection
• Lost RPC dump response
• Crash when reporting restore error via RPC
• Negative return code into shell
• Tasks left in wrong states after failed dump
• A little bit more verbose check action
• Coverity checks fail here and there

v. 1.0

Tarball:	criu-1.0.tar.bz2
Version:	1.0
Released:	25 Nov 2013
GIT tag:	v1.0

Fixes

• After --leave-running linked remaps were not cleaned
• TCP was left locked after --leave-running
• Weak criteria in memory COW detection
• Private mapping's premmapped address overwrote file ID
• Restorer memory could overlap with timers/signals arrays
• RPC worker reused options from service task
• Suboptimal memory utilization by restorer arguments
• TCP unsent/unacked data boundary was lost
• Wrong dev_t decoding on 64 bit
• Unpredictable daemons (service and page-service) working dir
• Parasite stack could be corrupted by its arguments
• Error from exe link restore was ignored
• Artificial small limit on the number of shared memory segments to restore
• Bug in ARM VFP restore
• VDSO proxy was unmapped at the very end of restore

New features

• -W option to specify working dir
• CHECK request in RPC
• Optimized headers
• More info in logs about undumpable files
• More comments about tricky dump/restore places
• Generic memory allocation for restorer

See also

• Download/criu for the latest release and archives
• Download/criu/0.x for pre-1.x releases