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of BLCR, including main features and bug fixes.
0.8.2
-----------
June 16, 2009
Bug fix and expanded-support release.
- This release adds support for 2.6.30 kernels
- This release fixes the following user-visible bugs and "issues"
+ "waitpid(0)" error when restarting a process that was a child of init
+ A race that would infrequently cause an abnormal restart to hang
0.8.1
-----------
March 25, 2009
Bug fix and expanded-support release.
- This release adds support for 2.6.29 kernels.
- The final known xen-specific bug (2457) has been found to be a Xen bug.
Xen 3.1.2 or newer is recomended when using BLCR.
- This release makes the following libcr API additions/changes:
+ Increase CR_MAX_CALLBACK from 32 to 32 million.
- This release adds additional error checking and improved documentation
for error cases for the following libcr functions:
+ cr_register_callback()
+ cr_replace_callback()
+ cr_register_hook()
- This release fixes the following user-visible bugs and "issues"
+ 2508 - inconsistent metadata from a networked file system
+ 2520 - possible deadlock when using some functions with critical sections
+ 2524 - restart-time SEGV on powerpc with 2.6.15 or older kernel
+ 2525 - process deadlock on checkpoint after restart
+ 2526 - process deadlock between omit and forward operations
+ C++ scoping problem for "struct cr_rstrt_relocate_pair"
+ Correct a bug that would reset the persist count across checkpoints
+ Prevent "stuck" tests when TOSTOP bit is set in termios.c_lflag.
+ Correct flaws in tests "prctl" and "stage0002" that could yield false
failures under certain conditions
0.8.0
-----------
January 12, 2009
Enhanced functionality and expanded-support release.
- This release adds support for 2.6.26, .27 and .28 kernels.
- In this release support for Xen is no longer considered experimental.
However, there is still one known xen-specific bug (2457) in which
the FPU state may become corrupted w/ paravirtualized kernels.
- In this release the majority of checkpoint I/O is performed using
O_DIRECT when available, significantly reducing the cost of checkpointing
any process which uses a large fraction of the physical memory.
- This release includes an unfinished port to SPARC64, contributed by
Vincentius Robby <vincentius@umich.edu> and Andrea Pellegrini
<apellegr@umich.edu>. Anyone willing/able to help complete this port
should contact checkpoint@lbl.gov.
- As previously announced, this release removes support for 2.4.x kernels
that contain backported NPTL support (e.g. RH9 and RHEL kernels). Support
for all other 2.4.x kernels was removed in 0.7.0.
- This release merges the blcr_vmadump kernel module into the blcr module.
- This release adds preliminary support for the "Fault Tolerance Backplane"
(FTB). See README.FTB for more information.
- This release adds the following features to the cr_checkpoint utility:
+ --kmsg-{none,error,warning} options to control reporting of kernel-level
errors and warnings messages when taking a checkpoint.
- This release adds the following features to the cr_restart utility:
+ --kmsg-{none,error,warning} options to control reporting of kernel-level
errors and warnings messages when restarting from a checkpoint.
+ --[no-]restore-{pid,pgid,sid} options to control restore of the
process id, process group id, and session id. The default remains as
in prior releases: restore only pid.
- This release makes the following libcr API additions/changes:
+ The following functions were announced in May 2008 as scheduled for
removal in 0.8.0. They have not been removed, but have been marked
with gcc's "deprecated" attribute to produce a compiler warning if used.
* cr_request()
* cr_request_file()
* cr_request_fd()
+ These functions have been added for controlling checkpoint requests:
* cr_wait_checkpoint()
* cr_reap_checkpoint()
* cr_log_checkpoint()
* cr_poll_checkpoint_msg()
The wait and reap functions expose independently the two steps taken in
the existing cr_poll_checkpoint() function. The log function collects
kernel-level error or warning messages if called between wait and reap.
The poll...msg() function is a convenience function, documented and
implemented in terms of the wait, log and reap functions.
The cr_poll_checkpoint() function will remain in libcr, but is now
documented and implemented in terms of cr_poll_checkpoint_msg().
+ A new CR_CHKPT_ASYNC_ERR flag to cr_request_checkpoint() defers the
reporting of almost all errors in a call to cr_request_checkpoint()
until the call to cr_reap_checkpoint() or cr_poll_checkpoint[_msg]().
+ The following functions have been added for making restart requests
via library calls, rather than using the cr_restart utility. These
are all marked "EXPERIMENTAL" as there might be significant changes
to these calls in the future.
* cr_initialize_restart_args_t()
* cr_request_restart()
* cr_wait_restart()
* cr_reap_restart()
* cr_log_restart()
* cr_poll_restart_msg()
* cr_poll_restart()
+ The struct members "old" and "new" in struct cr_rstrt_relocate_pair
have been renamed to "oldpath" and "newpath". This change was required
because "new" is a C++ reserved word.
See the comments in include/libcr.h for API documentation.
- This release makes the following additions/changes to the BLCR test suite:
+ Add tests of many of the features new to this release
+ Add new tests, or cases to existing tests, for reproducing several
of the bugs fixed in this release.
+ Fix command lines used in several tests to function correctly when
"POSIXLY_CORRECT" is set in the environment
+ Recode crut_wrapper and seq_wrapper in C, rather than perl, to allow
running the full testsuite in environments without perl (such as
embedded ARM platforms).
- This release fixes the following user-visible bugs and "issues"
+ 2021 - Provide extended error reporting mechanism
+ 2056 - Eliminate perl wrappers
+ 2287/2437 - Xen segment selector problems
+ 2292 - --restore-ids does not work correctly for multithreaded processes.
+ 2317 - implement "async" request errors
+ 2318 - checkpoint hangs after SEGV
+ 2322/2446 - Failure when stack limit is too big
+ 2344 - bad cr_restart usage causes kernel oops
+ 2453 - loss of sigaltstack across restart
+ 2454 - Oops in FPU restore
+ Address bug 2448 - there may have been a race with cr_close_other()
+ Fix ENOMEM when checkpointing processes with no supplementary group IDs
+ i386 FPU restore code would fail to notice corrupt i387 state
+ Fix a bug in the ARM atomics
+ Fix several issues with restart of 64-bit processes with a 32-bit
requester, as exposed by the addition of cr_request_restart() to libcr.
0.7.3
--------
August 12, 2008
Bug fix release
- Fix a kernel Oops on a rarely run error path.
- Fix a in-kernel memory leak when restoring unlinked files.
- Fix a file descriptor leak when cr_request_checkpoint() failed.
- Fix fsync() handling to allow checkpoints to /dev/null
- Fix bug 2309: cr_enter_cs() fails because of previous cri_info_free().
This bug was resolved by adding two new functions:
cr_inc_persist() and cr_dec_persist()
See comments in libcr.h for a description and usage.
- Fix bug 2311: vmadump_thaw_proc() returns -513.
- Fix bug 2315: ENOMEM with processes with zero supplementary group IDs.
- Fix bug 2316: "mkdir: file exists" module installation problem.
0.7.2
--------
July 28, 2008
Bug fix release
- Fix a logic error in use of kernel-level synchronization primitives.
- Fix a 32-bit VDSO restore bug on x86-64 2.6.23 and 2.6.24 kernels.
- Fix a kernel Oops seen with RH9 2.4.x kernels
- Fix bug 2298: compile error cr_io.o on SLES10sp2
- Fix bug 2300: restart fails for open file >2GB
- Fix bug 2302: block all signals in internal thread
0.7.1
--------
June 25, 2008
Bug fix and expanded-support release
- Fix (part of) bug 2263, allowing nested use of cr_run.
- Fix bug 2251, allowing use of HUGETLB_MORECORE=y with libhugetlbfs.
- Fix bug 2295 (restart failure w/ heap > 4GB).
- Fix sporadic EPERM failures when checkpointing encounters a zombie proc.
- Add support for 2.6.26-rc7 kernel.
While we don't officially support -rc<N> kernels, it is hoped that
these changes will be sufficient to support the final 2.6.26.
- Add cr_hold_ctrl(), allowing control over the thread hold behavior.
This is required to restore the 0.6.X behavior for at least one
application that would deadlock with the 0.7.X default behavior.
0.7.0
--------
May 30, 2008
Enhanced functionality and expanded-support release.
- This release adds support for 2.6.25 kernels.
- This release adds EXPERIMENTAL support for 32-bit PPC platforms.
- This release adds EXPERIMENTAL support for Xen-enabled kernels (both
dom0 and domU). In our testing so far it either works great or not
at all, depending on the installation. We have not yet identified
what distinguishes the working systems from the broken ones, and
would appreciate feedback on your success or failure using BLCR
with Xen-enabled Linux kernels.
- As previously announced, this release removes support for 2.4.x kernels
with the current exception of the RH9 and RHEL kernels (and derivatives)
that contain backported NPTL support. These too may be removed in the
not too distant future.
- As previously announced, this release begins the removal of support for
LinuxThreads. If you are using LinuxThreads you may experience random
failures in the BLCR testsuite and with your own multithreaded apps.
New interest in using BLCR with non-GNU libc may lead to a return of
LinuxThreads support. Please contact us if you have interest it this.
- This release adds the following features to the cr_checkpoint utility:
+ --quiet option to suppress output from cr_checkpoint
+ --noclobber option (don't disturb existing files)
+ Options for treatment of ptrace() child and parent processes:
--ptraced-{error,skip,allow}
--ptracer-{error,skip}
+ Options to save/restore executables and libraries in context files:
--save-{exe,private,shared,all,none}
See the cr_checkpoint manpage for more details on each of these.
- This release adds the following features to the cr_restart utility:
+ --quiet option to suppress output from cr_restart
Previously there was no way to do so without also losing the output
of the restarted process(es).
+ Add --run-on-* family of options to provide user-specified error
handling hooks. Previously there was no way to automatically/safely
distinguish a failure of cr_restart from a non-zero exit from the
restarted application. This resolves bug 1974.
+ Add --relocate option to enable restart-time replacement of file and
and directory paths saved in the context file.
+ Add --fd option to restore from an open fd, rather than a file.
See the cr_restart manpage for more details on each of these.
- This release adds the following feature to the cr_run utility:
+ --omit option to run a process with BLCR support such that the
process (and its descendants) will be omitted from checkpoints.
- This release makes the following libcr API additions/changes:
+ cr_forward_checkpoint() is fully tested and thus no longer labeled
as "use at your own risk". Its documentation in libcr.h is now
complete as well.
+ cr_register_hook() is fully tested and thus no longer labeled
as "use at your own risk".
+ As anticipated in previous releases, the error code returned from
cr_poll_checkpoint() has CHANGED for the case of restarting from a
checkpoint of oneself. This may break existing code that will not
be prepared for the new errno value. However, the previous value
of EINVAL could have masked actual invalid-argument errors.
The alternative of returning 0 (success) was considered, but was
discarded because it was deemed valuable to be able to reliably
distinguish whether one was continuing or restarting from a
checkpoint of oneself.
+ As alternatives to CR_ETEMPFAIL and CR_PERMFAIL, authors of BLCR
callbacks can now specify the errno values to be returned to the
checkpoint requester on a case-by-case basis.
+ cr_tryenter_cs() has been added as a non-blocking alternative to
the cr_enter_cs() function.
+ Several functions that would previously respond to usage errors
with an abort() or an undefined behavior now return -1 with one of
two new values of errno:
* CR_ENOINIT - caller has not made the required call to cr_init()
* CR_ENOTCB - call is only valid from a checkpoint callback
+ The following functions are marked as deprecated:
* cr_request()
* cr_request_file()
* cr_request_fd()
They do not provide any mechanism to specify the checkpoint scope
or to detect errors. They are currently implemented as (awkward)
wrappers around cr_request_checkpoint() and cr_poll_checkpoint().
They are scheduled to be removed in 0.8.0.
See the comments in include/libcr.h for API documentation.
- This release introduces two "stub" libraries: libcr_run and libcr_omit.
They differ from the "full" libcr library in that they contain only a
BLCR signal handler and the initialization code to register it. They
do not include any of the entry points declared in libcr.h, and the
handler code does not run any callbacks.
The cr_run utility now uses these libraries in LD_PRELOAD variable,
rather than the full libcr.so used in previous releases.
See the BLCR User's Guide for information on using these libs.
- This release makes several additions to the BLCR test suite, including
tests of most of the features new to this release and some motivated by
bugs fixed in this release. Many existing tests have been expanded to
exercise additional corner cases.
- This release makes the following changes to "configure" behavior:
+ The --with-linux= option now accepts a kernel revision (the output
or "uname -r") as a value, causing configure and search for that
revision in some standard locations. This is intended to make it
easier and less error prone to specify for which kernel to build.
In most modern distributions, this single option will be sufficient
to configure BLCR for any installed kernel.
+ Previously --with-linux= would be used to specify a kernel source
directory, and if needed --with-linux-obj= could be given to help
find the corresponding build directory. With this release the
role of --with-linux= as changed to be that of a build directory
and the option --with-linux-src= is available if the sources can't
be found automatically.
+ The configure-time probes of the kernel headers and configuration
are now performed using the full CFLAGS/CPPFLAGS from the Linux
kbuild infrastructure. This ensures proper configuration with
Xen-enabled kernels that prepend Xen-specific components to the
include path.
+ At configure time one can set KCC to specify that the kernel
modules are to be built with a different C compiler than the
user-space components of BLCR.
- On the ARM platform, the "good enough for LinuxThreads" implementation
of atomic operations has been replaced with truly atomic ops based
on the kernel-level support added for NPTL.
- As a temporary work-around for bug 2251, BLCR will currently refuse
to checkpoint processes with files on hugetlbfs mmap()ed with the
MAP_PRIVATE flag. This is to avoid potentially serious instability
that may result if BLCR attempts to checkpoint such a process.
- Fixes the following user-visible bugs and "issues"
+ 1974 - Make it possible to decide whether a restart succeeded
+ 2023 - ARM atomics need update
+ 2042 - libcr.so not linked to libc
+ 2124 - Make check fails at pid_in_use.st
+ 2214 - close cri_live_count race
+ 2216 - Move post-restart signal delivery to post-callback
+ 2247 - BLCR assumes 64-bit gcc on 64-bit arch
+ 2248 - Separate CC and KCC
+ 2265 - CR_CHECKPOINT_OMIT generates 0 byte context file
+ 2266 - process doing CR_CHECKPOINT_TEMP_FAILURE is killed!
+ 2271 - cr_checkpoint --clobber fails to overwrite file
+ 2272 - cr_get_restart_info returns wrong src path
+ 2274 - Invalid (zero or huge) pids seen at restart time
+ Remove bash-specific assumptions in the tests
+ Stronger validation of BLCR against proper kernel version
+ Validation of BLCR's kernel module versions against each other
+ Performance improvements from better memory management and
from coalescing of background work.
+ Preserve error codes for I/O errors. Previously any error
from a read/write at kernel level was reported as EIO. Now
the original errors (such as ENOSPC) are preserved.
+ Several others found by internal testing or reported by email
and fixed without assigning bug numbers.
- The file contrib/blcr.magic contains the format description needed
by the "file" utility to identify BLCR's context files.
0.6.5
--------
February 29, 2008
Bug-fix release.
- This release fixes a bug that could corrupt the kernel's pid hash
data structures if a restart failed due to a pid conflict on
kernels 2.6.17 and newer.
- This release fixes a use-after-free bug in the code for aborting
a checkpoint that could have caused a kernel Oops.
0.6.4
--------
January 28, 2008
Bug-fix and expanded-support release.
- This release adds support for 2.6.24 kernels.
- This release fixes bug 2234 which could cause a kernel Oops when
dealing with mmap()s of HUGETLBFS on some kernels.
0.6.3
--------
January 22, 2008
Bug-fix release.
- This release fixes bug 2001 which was causing intermittent floating-
point register corruption on x86-64, even after BLCR was unloaded.
0.6.2
--------
January 14, 2008
Bug-fix and expanded-support release.
- This release adds support for 2.6.23 kernels.
- This release adds support for SuSE's 2.6.22.x kernels.
- This release fixes a file descriptor leak that occurred on restart from
a checkpoint-of-self requested via cr_request_checkpoint().
- This release fixes a deadlock (and unkillable process(es)) when a
multi-threaded process aborts (or omits itself from) a checkpoint
under certain conditions.
- This release fixes a restart-time failure when a checkpoint includes a
pipe with one end outside the checkpoint scope, and data is buffered
in the pipe.
- This release fixes a bug with the cr_request{,_file}() calls in which
a failed checkpoint would cause failure of the next one if it had the
same destination file name.
- This release fixes a race condition with the cr_enter_cs() and checkpoints
in multi-threaded processes.
- This release fixes post-checkpoint signal delivery (--stop and friends)
to occur after the checkpoint is fully completed. See bug 2201 for
a full description of the problems addressed by these changes.
- This release documents (and fully implements) signal-delivery options
to cr_restart (see bug 2200).
- This release fixes two kernel Oopses (bugs 2222 and 2223) due to races
against processes/threads that are exiting.
- Adds test cases for most of the bugs fixed in this release.
- Minor improvements/changes to documentation
- Other minor bug fixes
0.6.1
--------
September 25, 2007
Bug-fix release
- This release resolves build and run-time issues seen on Debian "sid".
- This release eliminates the need to manually set __LINUX_ARM_ARCH__ at
configure time (ARM platform only).
- This release fixes a file descriptor leak that occurred on failure of a
checkpoint requested using any of the cr_request{,_file,_fd}() calls.
- This release fixes a race condition and a LinuxThreads incompatibility
in the "hooks" test (which is not run by default).
0.6.0
--------
September 10, 2007
Functionality and expanded-support release.
- This release adds support for 2.6.22 kernels.
- This release includes experimental support for PPC64 platforms
+ PPC64 supports both 32- and 64-bit applications.
+ No support for 32-bit kernels.
Contact us if you would like to help w/ a PPC32 port.
+ No support for 2.4.x kernels
+ Tested with NPTL and kernels 2.6.12 (Gentoo) and 2.6.18 (FC6)
+ There are known problems with BLCR with LinuxThreads on PPC64
- This release includes experimental support for ARM platforms.
+ Tested only for 2.6.12 and newer kernels
+ Thanks to Anton V. Uzunov <anton.uzunov@dsto.defence.gov.au>
of the Australian Government Department of Defence, Defence
Science and Technology Organisation for contributing this port.
+ ARM-specific questions should be directed to blcr-arm@hpcrd.lbl.gov
- This release includes experimental support for cross-compilation.
+ See config/cross_helper.c for information on cross-compilation.
+ This has been tested only in the context of the ARM port
+ Thanks to Anton V. Uzunov for motivating and testing this work
- This release includes a new API for issuing a checkpoint request.
+ Allows a program to request a checkpoint without the need to invoke
system("cr_checkpoint ...").
+ See comments in include/libcr.h for information on the following:
cr_initialize_checkpoint_args_t()
cr_request_checkpoint()
cr_poll_checkpoint()
- This release adds a mechanism (CR_CHECKPOINT_OMIT) for processes to
exclude themselves from a checkpoint (useful for batch-system helper or
shepherd processes).
- This release makes cr_checkpoint and cr_restart utilities checkpointable
- This release adds full support for mmap()-based shared memory
+ Repairs the loss of sharing that existed in 0.5.x releases
+ Supports hugetlbfs
- This release adds full support for save/restore of pending signals.
- Default scope of cr_checkpoint is now --tree, rather than --pid.
- Now checkpoint/restart unlinked open files.
- Revised handling of certain file-descriptors at restart:
+ No longer override "normal" files with correspondingly-numbered fds
from cr_restart as that consistently breaks shell "here documents".
+ Restore pipes endpoints that lie outside the checkpoint scope by
attaching them to stdin or stdout of cr_restart, rather than to its
correspondingly-numbered fds.
+ Opens of a process's controlling tty are attached to "/dev/tty" at
restart, even if they were open by their "exact" name at checkpoint
time (e.g. "/dev/pts/0").
- Experimental support for relocatable kernels on x86 and x86-64
- Expanded test-suite
- Option to install the testsuite (--enable-testsuite)
- Support "install-strip", "install-exec" and "install-data" make targets
- Tested against many scripting and programming language environments:
+ shells: ash, bash, (t)csh, (pd)ksh and zsh
+ scripting-type languages: perl, python, tcl/expect, ruby and guile
+ java runtime environments: Sun, IBM and GNU
+ misc. language runtimes: php, rep, clisp, emacslisp, gst, ocaml and sml
+ Run "make bonus-tests" to run these tests on your own machine, but be
warned that the tests themselves are fragile (contain races) and may
experience random failures. However, please do report any tests that
fail consistently.
- Many minor bug fixes and code cleanups
July, 2007 - DEPRECATED support for LinuxThreads and for Linux 2.4.X kernels
- Starting with the 0.6.0 release, new bug reports that one cannot reproduce
under NPTL + Linux 2.6.x will receive little or none of our attention.
However, we will try to distribute user-contributed fixes for such bugs.
Note that the 0.6.0 release *does* pass the BLCR test-suite under
LinuxThreads and/or 2.4.x kernels on the developers' x86 systems.
However, we have seen test failures on PPC64 when running LinuxThreads
with a 2.6.12 kernel (Gentoo distro).
- Beginning with the next "full" release (0.7.0) we will begin to remove
code in BLCR that exists only to support LinuxThreads and/or Linux 2.4.x.
- We have not yet decided the fate of support for those 2.4.x kernels which
include Red Hat's backport of NPTL support (RHL9.0, RHEL, RHAS, etc.).
- If anybody cares enough about 2.4.x and/or LinuxThreads to volunteer to
take over testing and maintenance of BLCR on such platforms, let us know.
0.5.6
--------
July 11, 2007
Bug-fix release.
- Fix a bug that could incorrectly restore data buffered in a pipe.
0.5.5
--------
April 27, 2007
Expanded-support release.
- This release adds support for 2.6.21 kernels.
0.5.4
--------
April 20, 2007
Bug-fix release.
- Multiple bug fixes, including:
+ Bug 1972: Restart pid-conflict could cause kernel Oops
+ Bug 1977: Unintended 2GB limit on application working set
+ Compilation problems on some x86_64 kernels (map_vsyscall undefined)
0.5.3
--------
March 29, 2007
Bug-fix release.
- Multiple bug fixes, including:
+ Bug 1961: Checkpoint of zombie yields kernel Oops.
+ Bug 1967: Restart failed: Bad address
+ Unkillable cr_restart if multi-threaded restart failed due to pid in use.
0.5.2
--------
March 23, 2007
Bug-fix release.
- Multiple bug fixes, including:
+ Bug 1949: cr_request*() functions need original context file to restart
+ Bug 1954: "cr_checkpoint -T" yields "invalid option"
+ Bug 1955: mmap(PROT_READ, MAP_SHARED) broken for read-only files
- Add "with_autoreconf" option to rpm specfile.
0.5.1
--------
March 20, 2007
Expanded-support and minor improvement release.
- Expanded kernel coverage
+ Add support for 2.6.17-5mdv and its updates (Mandriva 2007)
+ Add support for 2.6.20
- Fix -fstack-protector problems w/ the .src.rpm on FC6
- Eliminate harmless undefined symbol warnings from MODPOST
0.5.0
--------
March 2, 2007
Functionality and expanded-support release.
- Expanded kernel coverage
+ 2.6.0 through 2.6.19 for x86 and x86_64
+ 2.4.0 through 2.4.34 for x86 only
- Multi-process support (related processes and associated pipes)
+ See BLCR_Users_Guide.html and the cr_checkpoint man page
- Support for 32-bit apps on 64-bit kernels
+ See "--enable-multilib" in BLCR_Admin_Guide.html
- Support for directories opened with opendir()
- Support for open()s of /dev/{null,zero,full,random,urandom}
- Support for checkpoints on Luster file systems
+ Contributed by Dean Luick <luick@cray.com>
- Support for building static libcr
+ Contributed by Dean Luick <luick@cray.com>
- Fixes to many distclean problems
+ Issues identified by Dean Luick <luick@cray.com>
- I/O aggregation for improved performance
+ Contributed by Qi Gao <qaoq@cse.ohio-state.edu>
- Additional examples and test cases
- API addition: cr_get_restart_info()
- "Retool" of configure code for ease of addition/maintenance
- Numerous bug fixes, including:
+ Bug 1240: pid leak on restart failure
+ Bug 1396: SIGPIPE when restarting w/ stdin/out from/to a pipe
+ Bug 1640: context files > 2GB require O_LARGEFILE
+ Bug 1662: context files open R/W leads to restart failure
+ Bug 1669: checkpoint to a socket fails
+ Bug 1807: unrecognized warning suppression flag passed to gcc
+ Bug 1854: libcr link failure w/ stack-protection-enabled gcc
+ Bug 1925: link failure w/ pthread_atfork() on some glibc versions
+ Bug 1933: crash restoring dup of ignored fd (socket or chrdev)
+ Incorrect treatment of certain anonymous mmap() cases
+ MAP_SHARED mmap()ed regions would become MAP_PRIVATE upon restart
* NOTE: We still fail to restore any sharing among processes
when using MAP_ANONYMOUS or when mapping an unlinked file.
However, children fork()ed after a restart will now correctly
share with their parent.
FIXING THE LOST SHARING IS A HIGH-PRIORITY ITEM FOR 0.6.0
+ Wrong parent for restored orphans (children of init)
+ dup()ed file descriptors always restored together
0.4.2
--------
November 22, 2005
Functionality and bug-fix release.
- 2.6.x kernel support "stable"
- x86_64 support "stable" (but there is no support for 32-bit apps)
- Multiple bug fixes (some critical)
0.4.1_b5
--------
October 10, 2005
BETA bug-fix release.
- Multiple bug fixes (some critical)
0.4.1_b4
--------
August 24, 2005
BETA bug-fix release.
- Multiple bug fixes (some critical)
0.4.1_b3
--------
July 29, 2005
BETA bug-fix and functionality release.
- Fix inter-module dependencies under 2.6 kernels.
- Fix empty /etc/init.d/blcr in rpms
0.4.1_b2
--------
July 6, 2005
BETA bug-fix and functionality release.
- Opteron support completed (but experimental).
- Improved coverage of 2.6.x kernels (still considered experimental):
+ At least minimal testing under SuSE 9.{2,3} and Fedora Core {2,3,4}
+ Example init script updated for 2.6.x
+ Updates to Admin Guide for Fedora-isms
- Fixed file truncation bug
- Fixed signal trampoline bug with RHAS
- Support for Scalable Systems Software advanced to Fedora Core 2
- Some "dirty tricks" have been reimplemented with cleaner solutions:
+ New method for syscalls that bypass glibc
+ Better-supported signal trampolines (work w/ gcc 2.96 through 4.0.0)
+ More robust mechanism for module symbols (linker rather than cpp)
+ More robust mechanism for restart time thread creation
- Cleanups of .spec file to work w/ latest rpm version.
0.4.1_b1
--------
Not publicly released.
0.4.0
-----
February 18, 2005
Functionality release.
- Add experimental support for Linux 2.6.x kernels.
- Many changes as part of an in-progress Opteron port (incomplete).
0.3.1
-----
December 1, 2004
Bug-fix release.
- Fix a bug which rendered cr_run useless for most applications.
- Add athlon support to the RPM specfile and generally improve cpu
support in the specfile by honoring --target.
- Fix a race condition in pthreaded tests with LinuxThreads.
- Minor improvements to Admin Guide, including fixing a confusing typo.
0.3.0
-----
November 8, 2004
Functionality release.
- Files support is now enabled by default and no longer "experimental".
- Support for Scalable Systems Software (http://sss-oscar.sf.net).
- Fix libcr.so to allow use via dlopen().
- Many small bug fixes.
- Security fix related to LDT/TLS restore.
- Support for more kernel versions, including RHEL3 and CentOS 3.1
- Much more robust configuration-time checking of kernel headers.
- Runtime version checking between user space and kernel module.
- More informative error from cr_checkpoint when target process
lacks checkpointing support.
0.2.4 and 0.2.5
---------------
Snapshots for SSS-OSCAR testing. Not publicly released.
0.2.3
-----
April 30, 2004
Bug-fix release.
- Fixed compilation error that occurred with --enable-trace.
- Updated timeout thread to handle new DEAD state in 2.6 kernel (also in some
recent 2.4 RedHat kernels).
0.2.2
-----
April 23, 2004
Bug-fix release.
- Fixed bug with --enable-files support: regular file handles now
saved/restored across checkpoint correctly.
0.2.1
-----
December 05, 2003
Bug-fix release.
- Fix compilation problems with certain kernels and compilers.
Now known to compile with kernel.org kernels as old as 2.4.0
and as new as 2.4.23.
- Tested against kernels as old as a RedHat 2.4.7-10 and as new as a
RedHat 2.4.20-24.9.
- Tested w/ gcc 2.96, 3.2, 3.2.2 and 3.3.1.
- Fix vfork() problem which was causing "cr_run make" (or "make"
with LD_PRELOAD set) to fail.
- Fix problem where processes restored under 2.4.23 could not
subsequently be ptraced or dump core.
- Strip debugger bloat from kernel modules.
- Fixed locking problems which prevented experimental files code
from compiling against SMP kernels.
- Make the rpm spec file more easily reusable for different kernels.
- Modules now include proper version and contact info in syslog.
- Proper use count is now kept by modules.
0.2.0
-----
November 20, 2003
Initial public release.
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