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Schedule[edit]

See release schedule.

With 2.x we've decided to make several technologies be available as standalone projects (e.g. Compel) and tune the development and releases scheme to release new stuff faster than once every 3 monthes.

v. 2.5[edit]

Tarball: criu-2.5.tar.bz2
Released: 15 Aug 2016
Changes: v2.5

Name: Concrete oriole

New features[edit]

  • C/R
    • fs.mqueue.msg*_default sysctls
    • Unix sockets with overwritten paths
    • Link-remap files in removed directories

Optimizations/improvements[edit]

  • Micro-optimization on namespace ID evaluation
  • Restoring shared files uses one socket instead of per-fd ones
  • More verbosity when refusing to dump a file descriptor

Fixes[edit]

  • Restore could fail on openat() with ENXIO when multiple mnt namespaces get restored
  • The criu exec action got broken
  • Link-remap and ghost files remained on FS after restore failure
  • TCP window could remain clamped after restore resulting in connection lockup/slowdown
  • Dump could stuck when injecting a parasite
  • The --timeout option wasn't taken into account when freezing tasks using freezecg
  • Race in freezeing/seizing could result in lost tasks
  • Memory leaks here and there on error paths
  • Double free in xvstrcat (crash)
  • VDSO length was mis-calculated
  • Symlink on --root path could make restore erroneously fail
  • Potential memory corruption on reading mntns images
  • When restoring on systems with low pid_max limit restore could fail
  • RO-protected SysV shmem segments could be restored with PROT_EXEC
  • File mode of mapped file was evaluated with errors
  • Restore of cgroups' mem.swappines and ..use_hierarchy blocked sub-groups creation
  • Impossible to restore cgoup mem.swappines default value
  • Zombies living in orphan sessions/groups failed the restore

v. 2.4[edit]

Tarball: criu-2.4.tar.bz2
Released: 11 Jul 2016
Changes: v2.4

Name: Marble lark

New features[edit]

  • Generate core from images
  • Ability to forcibly drop half-open TCP connections on C/R
  • Ability to specify cgroup ctls to dump via API
  • Opened/mapped files' mode is compared between dump and restore times
  • C/R of
    • AutoFS mountpoints
    • New cgroups (perf_event, net_cls, net_prio and pids)
    • Memcgroup optional properties
    • Devices cgroup

Optimizations/improvements[edit]

  • Pagemap image entries are cached in memory

Fixes[edit]

  • Configured kmem cgroup limit restore failed
  • Mem cgroup oom_control
  • Cgroup's pids.max was not C/R-ed
  • Failure to write cgroup property was ignored
  • No init PID in pre-dump action script
  • Sigactions inheritance didn't work on ARM
  • Opened "/proc" dir blocked the dump
  • Working with iptables was racy
  • Sibling mounts detection error on dump
  • Devconf accept_redirects devconf could be restored with errors
  • "All" devconfs could be overridden by "Default"
  • Name-less unix sockets got auto-bound
  • Mode was lost for PTY device file on restore
  • Newer protobuf compilers didn't recognize PB files
  • External mounts could be remounted with MS_PRIVATE
  • Build fail on Alpine Linux

Deprecated/removed[edit]

  • Per-pid file locks images
  • Per-pid fdinfo images
  • Ancient pagemap/pages images

v. 2.3[edit]

Tarball: criu-2.3.tar.bz2
Released: 14 Jun 2016
Changes: v2.3

Name: Wooden duck

New features[edit]

  • Ability not to show payload for some objects in CRIT
  • Pidfile is written at the end of restore
  • Ability to join existing namespaces on restore
  • C/R of
    • Data sitting in TTYs
    • Partially write-protected SysVIPC segments
    • Debugfs and tracefs mounts
    • Overmounted tmpfs
    • IPv6 devconf sysctls
    • External block devices
    • Unix sockets with mismatched shutdown state

Optimizations/improvements[edit]

  • Relaxed calculation of AIO ring size
  • Tree-based search of tasks by real pid
  • Less mem-to-mem copies on restore
  • Saner devconf image format
  • More verbose explanation of why task cannot be seized
  • PID is printed in PIE logs

Fixes[edit]

  • Too many mmap-ed files blocked the dump
  • Potential memory corruption when working with IPv6 sockets
  • Overmounted bind mounts could cause restore to fail
  • Overmounted bind mounts could result in badly restored mount tree
  • Incomplete restoration of RO bind mounts options

Deprecated/removed[edit]

  • Greedy mode of pagemap (non-root) caused dump to fail (disabled)

v. 2.2[edit]

Tarball: criu-2.2.tar.bz2
Released: 16 May 2016
Changes: v2.2

Name: Carbon nightingale

New features[edit]

  • Uninstall action in Makfilefile
  • "Post-resume" added to action scripts
  • Root task's PID in environment for action scripts
  • C/R of
    • Devconfs drop_gratuitous_arp and drop_unicast_in_l2_multicast
  • * Serial ttys

Optimizations/improvements[edit]

  • Lighter link-remaps restore on newer kernels

Fixes[edit]

  • Race when restoring userns vs setting ns' maps
  • Tasks with zero fds failed the dump
  • Restore of TCP recv queue could fail due to kernel mem alloc constraints
  • No errors were written to logs when launching helper (tar/iptables) app in userns restore
  • User-mode dumped no memory pages sometimes
  • Bind mounts considered not as bind sometimes
  • Two mounts in the same directory blocked the dump
  • Off-by in on /dev/tty{1,63} dumping
  • Forking of cgroupns task was done with screwed clone flags

Deprecated/removed[edit]

  • Greedy mode of pagemap dumping (on some kernels we do not support user-mode)
  • Removed the --namespaces option

v. 2.1[edit]

Tarball: criu-2.1.tar.bz2
Released: 11 Apr 2016
Changes: v2.1

Name: Steel Lapwing

New features[edit]

  • Checking now classifies features to important/extra/experimental
  • Ability to bring some disk files into images. See $source/scripts/tmp-files.sh
  • C/R of
    • Completed AIO requests
    • Fallback gre and gretap net devices

Optimizations/improvements[edit]

  • Code coverage collecting now works
  • Use native rtnl library for netlink messages processing
  • Using --output - now results in stdout as log, not a file with the name "-"
  • Signals are printed by names in logs

Fixes[edit]

  • Make tar generated tarbal with bad name
  • CG restore code lacked rollback in some places
  • Error code from raw syscalls was treated with errors resulting in wrong criu check reports
  • Dumping task with HUGE amount of file descriptors failed
  • Task could be stopped after pre-dump if respective option was used
  • A /proc/pid directory from dead process conflicting with a new alive one could cause dump to fail
  • Zombie from alien session/process group caused restore to fail
  • CGroup fs was wrongly mounted in CGNS on restore
  • Irmap scan was mis-checking devices numbers
  • Use-after-free in irmap scan
  • Btrfs bindmounts detection was mistaken due to 'subvol=' options met
  • Propagation of mountpoint's shared groups was lost for propagated mounts
  • Unaligned allocations of restore shared memory could result in codedumps when used by futexes
  • Temporary mountpoints could result in spurious propagations
  • When aborting the dump criu could crash on use-after-free objects
  • Locking the network could stuck doing the DNS resolve
  • Several build fixes

Deprecated/removed[edit]

  • The images from criu prior to 0.4 are deprecated
  • The --namespaces option makes no sense and is also deprecated
  • The --ms option for check action is deprecated

v. 2.0[edit]

Tarball: criu-2.0.tar.bz2
Released: 7 Mar 2016
Changes: v2.0

New features[edit]

  • New code layout for sub-projects (e.g. Compel)
  • Unprivileged dump
  • Dump/check cpuinfo support for PPC
  • Explorers for CRIT
  • Added "post-setup-namespaces" to action scripts
  • Added timeout for dump procedure (5 sec by default)
  • Ability to override LSM profile on restore with CLI/RPC option
  • External bind mounts can be fs-root mounts too
  • Skip netns' internals on dump and restore (for Docker integration)
  • Advanced support for external files
  • C/R for
    • Mode and uid/gid of cgroup files and dirs
    • Freeze cgroup state (frozen/thawed)
    • Task's loginuid and oom score
    • Per-thread credentials
    • Filter mode of seccomp
    • Ghost file in removed directory
    • Ghost files lutimes
    • Binfmt-misc FS contents
    • Netfilter conntracks and expectations
    • Multi-headed cgroups
    • CGroup namespaces (no nesting)

Optimizations/improvements[edit]

  • Align parasite stack on 16 bits for correctness
  • Compilation with native libc syscall wrappers and helpers
  • Parasite code injection done via memfd system call
  • Make vaddr to pfn conversion with one less syscall
  • CRIT shows device numbers in "maj:min" manner
  • CRIT shows mmap's status in verbose
  • Docker files for builds on all supported arches

Fixes[edit]

  • Absent readlink syscall on ARM (use readlinkat instead) could cause dump to fail
  • Wrong argument to timer_create system call could cause restore to crash
  • Extra tasks in freeze cgroup caused dump to fail/hand/crash
  • Unaligned restore-time object allocations caused lock operations to fail
  • Opened /proc/pid dir of dead task failed the dump
  • Unaligned stacks caused criu to fail on aarch64
  • Changed device numbers on restore side could cause random failures
  • Fixes in mount points sharing/slavery/propagation restore
  • Race between mntns creation and fds closing in different tasks could cause restore to fail
  • Hard kernel limit on TCP repair recv queue restore could cause big queue restore to fail
  • Unconnected dgram UNIX socket with data lost packets on restore
  • CRIT didn't show IPC objects
  • CRIT didn't convert IP addresses in images
  • Logs from PIE code contained corrupted addresses and sizes
  • Not loaded netfilter modules could cause dump/restore to stuck on dumping netlink socket
  • Shared external mounts were restored with error

Security[edit]

  • User-mode
  • When checking for namespaces' CRIU entered userns with host creds

Deprecated/removed[edit]

  • Completely removed 'show' action. Use CRIT instead.

CRIU 1.x[edit]

At this point the project has proven to be doable and we've concentrated on fulfilling its functionality, improving stability and performance.

v. 1.8[edit]

Tarball: criu-1.8.tar.bz2
Released: 7 Dec 2015
Changes: v1.8

New features[edit]

  • 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[edit]

  • 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[edit]

  • 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[edit]

  • 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[edit]

Tarball: criu-1.7.2.tar.bz2
Released: 28 Oct 2015
Changes: v1.7.2

Fixes[edit]

  • 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[edit]

Tarball: criu-1.7.tar.bz2
Released: 7 Sep 2015
Changes: v1.7

New features[edit]

  • 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[edit]

  • 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[edit]

  • 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[edit]

Tarball: criu-1.6.1.tar.bz2
Released: 12 Aug 2015
Changes: v1.6.1

New features[edit]

  • Support for relative paths for unix sockets

Fixes[edit]

  • 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[edit]

Tarball: criu-1.6.tar.bz2
Released: 1 Jun 2015
Changes: v1.6

New features[edit]

  • 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[edit]

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

Fixes[edit]

  • 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[edit]

Tarball: criu-1.5.2.tar.bz2
Released: 28 Apr 2015
Changes: v1.5.2

Fixes[edit]

  • 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[edit]

Tarball: criu-1.5.1.tar.bz2
Released: 31 Mar 2015
Changes: v1.5.1

New features[edit]

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

Fixes[edit]

  • 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[edit]

Tarball: criu-1.5.tar.bz2
Released: 2 Mar 2015
Changes: v1.5

New features[edit]

  • 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

Optimizations[edit]

  • 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[edit]

  • 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[edit]

Tarball: criu-1.4.tar.bz2
Released: 1 Dec 2014
Changes: v1.4

New features[edit]

  • 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[edit]

  • 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[edit]

  • 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[edit]

Tarball: criu-1.3.1.tar.bz2
Released: 12 Sep 2014
Changes: v1.3.1

Fixes[edit]

  • 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[edit]

Tarball: criu-1.3.tar.bz2
Released: 1 Sep 2014
Changes: v1.3

New features[edit]

  • 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[edit]

  • 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[edit]

  • 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[edit]

Tarball: criu-1.3-rc2.tar.bz2
Released: 18 Jun 2014
Changes: v1.3-rc2

New features[edit]

  • 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[edit]

  • 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[edit]

Tarball: criu-1.3-rc1.tar.bz2
Released: 25 Apr 2014
Changes: v1.3-rc1

New features[edit]

  • 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[edit]

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

Fixes[edit]

  • 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[edit]

Tarball: criu-1.2.tar.bz2
Released: 26 Feb 2014
Changes: v1.2

New features[edit]

  • 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
  • New "post-restore" call in action scripts
  • Logrotate rules file
  • Default log file for service when starting via systemd

Fixes[edit]

  • 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[edit]

Tarball: criu-1.1.tar.bz2
Released: 28 Jan 2013
Changes: v1.1

Fixes[edit]

  • 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[edit]

Tarball: criu-1.1-rc2.tar.bz2
Released: 20 Jan 2014
Changes: v1.1-rc2

Fixes[edit]

  • 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[edit]

Tarball: criu-1.1-rc1.tar.bz2
Released: 30 Dec 2013
Changes: v1.1-rc1

New features[edit]

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

Fixes[edit]

  • 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[edit]

Tarball: criu-1.0.tar.bz2
Released: 25 Nov 2013
Changes: v1.0

Fixes[edit]

  • 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[edit]

  • -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

Proof-of-concept stage[edit]

v. 0.8[edit]

Tarball: criu-0.8.tar.bz2
Released: 18 Oct 2013
Changes: v0.8

New features[edit]

  • RPC service
  • Ability to work from non-root user (via +s bit)
  • Handle stopped tasks
  • Restore tasks' root path
  • Dump and restore net ns iptables configuration (w/o conntracks)
  • Support for external net devices in netns (e.g. openvz venet)
  • Support CORK and NODELAY TCP options
  • SEQPACKET unix sockets support

Fixes and improvements[edit]

  • Unload restorer blob after restore
  • Fixes and enhancements in criu show
  • Fix in unsorted inotify wd restoring
  • Fixed trimmed messages in parasite transport
  • Fine-grained pgrps restore
  • Fix in large TCP buffers restore
  • Fixed buffer overflow in IPC ns dumping
  • Fix in early page server connection close on pre-dump
  • Fixed race in handling aborted parasite blob
  • Fixed lost unmapped criu vmas in restore
  • Fixes in parsing devices in /proc/pid/maps and /proc/locks
  • Fixed snd/rcv buf sockoptions restore
  • Enhanced logging in parasite

v. 0.7[edit]

Tarball: criu-0.7.tar.bz2
Released: 3 Sep 2013
Changes: v0.7

New features[edit]

  • TUN devices support (requires patched kernel)
  • Alternative stack (sigaltstack) C/R
  • Shared and master/slave mounts support
  • Restore statistics
  • Net device address C/R
  • Safer and simpler asynchronous parasite
  • Fixes in
    • Stack guard page dump/restore
    • Page server communications
    • COW mappings restore
    • Zombies restore
    • Aborting failed restore
    • TCP connection restore (some require patched kernel)
    • Semi-closed Unix sockets with data dump/restore
    • etc.

v. 0.6[edit]

Tarball: criu-0.6.tar.bz2
Released: 1 Jul 2013
Changes: v0.6

New features[edit]

  • Cross-compiling support
  • Ready to accept images from OpenVZ RHEL6-based kernel
    • VDSO conversion
  • Posix CPU timers C/R
  • Asynchronous parasite
    • Self-heal dumpee in case of crtools crash
  • Memory changes tracking (requires patched kernel)
    • Incremental backups
    • Pre-dump task command for smaller freeze time
  • Dump statistics
  • Return-arg for remote syscalls execution
  • Improved "show" output
  • Opened /proc/PID/ns/* files C/R
  • Daemon mode for page-server
  • Build-time features test (makes it possible to build on different distros)

v. 0.5[edit]

Tarball: criu-0.5.tar.bz2
Released: 30 Apr 2013
Changes: v0.5

New features[edit]

  • C/R netlink sockets
  • C/R pending signals
  • New format for memory dumps
  • Incremental dumps (preliminary)
  • Ability to directly send memory dumps on remote host (for faster live migration)
  • Images showing enhancements
  • Kernel features checking enhancements
  • Lots of BUGs fixed
  • Renamed crtools to criu (both binary and source package names)

v. 0.4[edit]

crtools-0.4.tar.bz2
Released: 20 Feb 2013
Changes: v0.4

New features[edit]

  • ARM port
  • Remote syscall execution
  • C/R of
    • FPU state
    • File locks (basic support)
    • Rlimits
    • FANotify descriptors
    • Shared fdtable (table of file descriptors)
    • Tasks' umask
    • Pipe buffer size
    • Unix sockets' credentials
    • TCP time-stamp offset (allows to migrate a TCP socket, requires custom kernel)
  • Automatic namespaces detection (--namespace option is deprecated)

Internal[edit]

  • Build system rework
  • Dumping/restoring memory pointers standardized (while doing ARM port)
  • Ability to collect coverage (gcov, reported here)
  • 32/64-bit problems mostly resolved (while doing ARM port)

v. 0.3[edit]

crtools-0.3.tar.bz2
Released: 11 Dec 2012
Changes: v0.3

New features[edit]

  • C/R of shell jobs
  • Handle files, that are opened and unlinked, but some other hard link exists
  • More SOL_SOCKET socket options. Two most interesting are:
    • Binding socket to device (SO_BINDTODEVICE)
    • Per-socket packet filter (SO_ATTACH_FILTER)
  • Shutdown state of a socket
  • Task scheduler parameters (nice, policy and prio)
  • Properly handle COW pages
  • Memory mapped packet sockets (with SOL- options this is enough for tcpdump tool support)
  • Complementary groups (getgroups(2))
  • Various mapping features, configured with madvise(2)
  • Tune TCP sockets support to work with IPv6 sockets
  • Closed (or not yet connected/bound) unix sockets

Bug fixes and improvements[edit]

  • Print timestamps in log files
  • Restructure source tree a little
    • PIE stuff in separate dir
    • Arch-specific code in arch/<Arch>/ directory
  • Nicer show -c output for pages/pipes/etc contents
  • Fixes in help text
  • Save and restore blocked signals mask for threads
  • Don't dump (and warn about it) corked UDP sockets
  • Fixed livelocks when restoring too big socket queues
  • Refresh info about sockets, that might have changed between diag dump and actual process freeze
  • Lost file params and socket options for some unix sockets
  • Fix inotify on opened and unlinked files
  • Fix shared anonymous memory detection
  • Properly close all files before restoring them
  • Fixes in running external tools (ip/tar)
  • Several fixes in control tty restoring code
  • RT signals handlers dumped and restored

v. 0.2[edit]

crtools-0.2.tar.bz2
Released: 20 Sep 2012
Changes: v0.2

v. 0.1[edit]

crtools-0.1.tar.bz2
Released: 23 Jul 2012
Changes: v0.1