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When building gdb with gcc 12 and -fsanitize=threads while renabling background dwarf reading by setting dwarf_synchronous to false, I run into: ... (gdb) file amd64-watchpoint-downgrade Reading symbols from amd64-watchpoint-downgrade... (gdb) watch global_var ================== WARNING: ThreadSanitizer: data race (pid=20124) Read of size 8 at 0x7b80000500d8 by main thread: #0 cooked_index_entry::full_name(obstack*, bool) const cooked-index.c:220 #1 cooked_index::get_main_name(obstack*, language*) const cooked-index.c:735 #2 cooked_index_worker::wait(cooked_state, bool) cooked-index.c:559 #3 cooked_index::wait(cooked_state, bool) cooked-index.c:631 #4 cooked_index_functions::wait(objfile*, bool) cooked-index.h:729 #5 cooked_index_functions::compute_main_name(objfile*) cooked-index.h:806 #6 objfile::compute_main_name() symfile-debug.c:461 #7 find_main_name symtab.c:6503 #8 main_language() symtab.c:6608 #9 set_initial_language_callback symfile.c:1634 #10 get_current_language() language.c:96 ... Previous write of size 8 at 0x7b80000500d8 by thread T1: #0 cooked_index_shard::finalize(parent_map_map const*) \ dwarf2/cooked-index.c:409 #1 operator() cooked-index.c:663 ... ... SUMMARY: ThreadSanitizer: data race cooked-index.c:220 in \ cooked_index_entry::full_name(obstack*, bool) const ================== Hardware watchpoint 1: global_var (gdb) PASS: gdb.arch/amd64-watchpoint-downgrade.exp: watch global_var ... This was also reported in PR31715. This is due do gcc PR110799 [1], generating wrong code with -fhoist-adjacent-loads, and causing a false positive for -fsanitize=threads. Work around the gcc PR by forcing -fno-hoist-adjacent-loads for gcc <= 13 and -fsanitize=threads. Tested in that same configuration on x86_64-linux. Remaining ThreadSanitizer problems are the ones reported in PR31626 (gdb.rust/dwindex.exp) and PR32247 (gdb.trace/basic-libipa.exp). PR gdb/31715 Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31715 Tested-By: Bernd Edlinger <bernd.edlinger@hotmail.de> Approved-By: Tom Tromey <tom@tromey.com> [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110799 |
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bfd | ||
binutils | ||
config | ||
contrib | ||
cpu | ||
elfcpp | ||
etc | ||
gas | ||
gdb | ||
gdbserver | ||
gdbsupport | ||
gnulib | ||
gold | ||
gprof | ||
gprofng | ||
include | ||
ld | ||
libbacktrace | ||
libctf | ||
libdecnumber | ||
libiberty | ||
libsframe | ||
opcodes | ||
readline | ||
sim | ||
texinfo | ||
zlib | ||
.cvsignore | ||
.editorconfig | ||
.gitattributes | ||
.gitignore | ||
.pre-commit-config.yaml | ||
ar-lib | ||
ChangeLog | ||
compile | ||
config-ml.in | ||
config.guess | ||
config.rpath | ||
config.sub | ||
configure | ||
configure.ac | ||
COPYING | ||
COPYING3 | ||
COPYING3.LIB | ||
COPYING.LIB | ||
COPYING.LIBGLOSS | ||
COPYING.NEWLIB | ||
depcomp | ||
djunpack.bat | ||
install-sh | ||
libtool.m4 | ||
lt~obsolete.m4 | ||
ltgcc.m4 | ||
ltmain.sh | ||
ltoptions.m4 | ||
ltsugar.m4 | ||
ltversion.m4 | ||
MAINTAINERS | ||
Makefile.def | ||
Makefile.in | ||
Makefile.tpl | ||
makefile.vms | ||
missing | ||
mkdep | ||
mkinstalldirs | ||
move-if-change | ||
multilib.am | ||
README | ||
README-maintainer-mode | ||
SECURITY.txt | ||
setup.com | ||
src-release.sh | ||
symlink-tree | ||
test-driver | ||
ylwrap |
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.