We are pleased to announce a new release of Valgrind, version 3.21.0,
available from https://valgrind.org/downloads/current.html.
See the release notes below for details of changes.
Our thanks to all those who contribute to Valgrind's development. This
release represents a great deal of time, energy and effort on the part
of many people.
Happy and productive debugging and profiling,
-- The Valgrind Developers
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This release supports X86/Linux, AMD64/Linux, ARM32/Linux, ARM64/Linux,
PPC32/Linux, PPC64BE/Linux, PPC64LE/Linux, S390X/Linux, MIPS32/Linux,
MIPS64/Linux, ARM/Android, ARM64/Android, MIPS32/Android, X86/Android,
X86/Solaris, AMD64/Solaris, AMD64/MacOSX 10.12, X86/FreeBSD and
AMD64/FreeBSD. There is also preliminary support for X86/macOS 10.13,
AMD64/macOS 10.13 and nanoMIPS/Linux.
* ==================== CORE CHANGES ===================
* When GDB is used to debug a program running under valgrind using
the valgrind gdbserver, GDB will automatically load some
python code provided in valgrind defining GDB front end commands
corresponding to the valgrind monitor commands.
These GDB front end commands accept the same format as
the monitor commands directly sent to the Valgrind gdbserver.
These GDB front end commands provide a better integration
in the GDB command line interface, so as to use for example
GDB auto-completion, command specific help, searching for
a command or command help matching a regexp, ...
For relevant monitor commands, GDB will evaluate arguments
to make the use of monitor commands easier.
For example, instead of having to print the address of a variable
to pass it to a subsequent monitor command, the GDB front end
command will evaluate the address argument. It is for example
possible to do:
(gdb) memcheck who_points_at &some_struct sizeof(some_struct)
instead of:
(gdb) p &some_struct
$2 = (some_struct_type *) 0x1130a0 <some_struct>
(gdb) p sizeof(some_struct)
$3 = 40
(gdb) monitor who_point_at 0x1130a0 40
* The vgdb utility now supports extended-remote protocol when
invoked with --multi. In this mode the GDB run command is
supported. Which means you don't need to run gdb and valgrind
from different terminals. So for example to start your program
in gdb and run it under valgrind you can do:
$ gdb prog
(gdb) set remote exec-file prog
(gdb) set sysroot /
(gdb) target extended-remote | vgdb --multi
(gdb) start
* The behaviour of realloc with a size of zero can now
be changed for tools that intercept malloc. Those
tools are memcheck, helgrind, drd, massif and dhat.
Realloc implementations generally do one of two things
- free the memory like free() and return NULL
(GNU libc and ptmalloc).
- either free the memory and then allocate a
minimum sized block or just return the
original pointer. Return NULL if the
allocation of the minimum sized block fails
(jemalloc, musl, snmalloc, Solaris, macOS).
When Valgrind is configured and built it will
try to match the OS and libc behaviour. However
if you are using a non-default library to replace
malloc and family (e.g., musl on a glibc Linux or
tcmalloc on FreeBSD) then you can use a command line
option to change the behaviour of Valgrind:
--realloc-zero-bytes-frees=yes|no [yes on Linux glibc, no otherwise]
* ================== PLATFORM CHANGES =================
* Make the address space limit on FreeBSD amd64 128Gbytes
(the same as Linux and Solaris, it was 32Gbytes)
* ==================== TOOL CHANGES ===================
* Memcheck:
- When doing a delta leak_search, it is now possible to only
output the new loss records compared to the previous leak search.
This is available in the memcheck monitor command 'leak_search'
by specifying the "new" keyword or in your program by using
the client request VALGRIND_DO_NEW_LEAK_CHECK.
Whenever a "delta" leak search is done (i.e. when specifying
"new" or "increased" or "changed" in the monitor command),
the new loss records have a "new" marker.
- Valgrind now contains python code that defines GDB memcheck
front end monitor commands. See CORE CHANGES.
- Performs checks for the use of realloc with a size of zero.
This is non-portable and a source of errors. If memcheck
detects such a usage it will generate an error
realloc() with size 0
followed by the usual callstacks.
A switch has been added to allow this to be turned off:
--show-realloc-size-zero=yes|no [yes]
* Helgrind:
- The option ---history-backtrace-size=<number> allows to configure
the number of entries to record in the stack traces of "old"
accesses. Previously, this number was hardcoded to 8.
- Valgrind now contains python code that defines GDB helgrind
front end monitor commands. See CORE CHANGES.
* Cachegrind:
- `--cache-sim=no` is now the default. The cache simulation is old and
unlikely to match any real modern machine. This means only the `Ir`
event are gathered by default, but that is by far the most useful
event.
- `cg_annotate`, `cg_diff`, and `cg_merge` have been rewritten in
Python. As a result, they all have more flexible command line
argument handling, e.g. supporting `--show-percs` and
`--no-show-percs` forms as well as the existing `--show-percs=yes`
and `--show-percs=no`.
- `cg_annotate` has some functional changes.
- It's much faster, e.g. 3-4x on common cases.
- It now supports diffing (with `--diff`, `--mod-filename`, and
`--mod-funcname`) and merging (by passing multiple data files).
- It now provides more information at the file and function level.
There are now "File:function" and "Function:file" sections. These
are very useful for programs that use inlining a lot.
- Support for user-annotated files and the `-I`/`--include` option
has been removed, because it was of little use and blocked other
improvements.
- The `--auto` option is renamed `--annotate`, though the old
`--auto=yes`/`--auto=no` forms are still supported.
- `cg_diff` and `cg_merge` are now deprecated, because `cg_annotate`
now does a better job of diffing and merging.
- The Cachegrind output file format has changed very slightly, but in
ways nobody is likely to notice.
* Callgrind:
- Valgrind now contains python code that defines GDB callgrind
front end monitor commands. See CORE CHANGES.
* Massif:
- Valgrind now contains python code that defines GDB massif
front end monitor commands. See CORE CHANGES.
* DHAT:
- A new kind of user request has been added which allows you to
override the 1024 byte limit on access count histograms for blocks
of memory. The client request is DHAT_HISTOGRAM_MEMORY.
* ==================== FIXED BUGS ====================
The following bugs have been fixed or resolved. Note that "n-i-bz"
stands for "not in bugzilla" -- that is, a bug that was reported to us
but never got a bugzilla entry. We encourage you to file bugs in
bugzilla (https://bugs.kde.org/enter_bug.cgi?product=valgrind) rather
than mailing the developers (or mailing lists) directly -- bugs that
are not entered into bugzilla tend to get forgotten about or ignored.
170510 Don't warn about ioctl of size 0 without direction hint
241072 List tools in --help output
327548 false positive while destroying mutex
382034 Testcases build fixes for musl
351857 confusing error message about valid command line option
374596 inconsistent RDTSCP support on x86_64
392331 Spurious lock not held error from inside pthread_cond_timedwait
397083 Likely false positive "uninitialised value(s)" for __wmemchr_avx2 and
__wmemcmp_avx2_movbe
400793 pthread_rwlock_timedwrlock false positive
419054 Unhandled syscall getcpu on arm32
433873 openat2 syscall unimplemented on Linux
434057 Add stdio mode to valgrind's gdbserver
435441 valgrind fails to interpose malloc on musl 1.2.2 due to weak symbol
name and no libc soname
436413 Warn about realloc of size zero
439685 compiler warning in callgrind/main.c
444110 priv/guest_ppc_toIR.c:36198:31: warning: duplicated 'if' condition.
444487 hginfo test detects an extra lock inside data symbol "_rtld_local"
444488 Use glibc.pthread.stack_cache_size tunable
444568 drd/tests/pth_barrier_thr_cr fails on Fedora 38
445743 "The impossible happened: mutex is locked simultaneously by two threads"
while using mutexes with priority inheritance and signals
449309 Missing loopback device ioctl(s)
459476 vgdb: allow address reuse to avoid "address already in use" errorsuse"
errors
460356 s390: Sqrt32Fx4 -- cannot reduce tree
462830 WARNING: unhandled amd64-freebsd syscall: 474
463027 broken check for MPX instruction support in assembler
464103 Enhancement: add a client request to DHAT to mark memory to be
histogrammed
464476 Firefox fails to start under Valgrind
464609 Valgrind memcheck should support Linux pidfd_open
464680 Show issues caused by memory policies like selinux deny_execmem
464859 Build failures with GCC-13 (drd tsan_unittest)
464969 D language demangling
465435 m_libcfile.c:66 (vgPlain_safe_fd): Assertion 'newfd >=
VG_(fd_hard_limit)' failed.
466104 aligned_alloc problems, part 1
467036 Add time cost statistics for Regtest
467482 Build failure on aarch64 Alpine
467714 fdleak_* and rlimit tests fail when parent process has more than
64 descriptors opened
467839 Gdbserver: Improve compatibility of library directory name
468401 [PATCH] Add a style file for clang-format
468556 Build failure for vgdb
468606 build: remove "Valgrind relies on GCC" check/output
469097 ppc64(be) doesn't support SCV syscall instruction
n-i-bz FreeBSD rfork syscall fail with EINVAL or ENOSYS rather than
VG_(unimplemented)
To see details of a given bug, visit
https://bugs.kde.org/show_bug.cgi?id=XXXXXX
where XXXXXX is the bug number as listed above.
* ==================== KNOWN ISSUES ===================
* configure --enable-lto=yes is know to not work in all setups.
See bug 469049. Workaround: Build without LTO.
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