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Due to the recent commit in aix-thread.c, we see a segmentation fault in AIX while debugging multiple process involving multiple threads. One example is a thread that can fork. The GDB output in AIX for the same is Reading symbols from //gdb_tests/multi-thread-fork... (gdb) set detach-on-fork off (gdb) r Starting program: /gdb_tests/multi-thread-fork [New Thread 258 (tid 67110997)] [New Thread 515 (tid 127404289)] [New inferior 2 (process 16580940)] Hello from Parent! [process 16580940 exited] [New inferior 3 (process 14549318)] Hello from Parent! [process 14549318 exited] Fatal signal: Segmentation fault ----- Backtrace ----- This is because in sync_threadlists () in aix-thread.c there when we delete threads in unknown state we iterate through all the threads. When we have one or more threads with the same user thread ID but of different process then we delete a wrong thread. Since we just check only the pdtid in in_queue_threads.count (priv->pdtid) == 0 this happened. This patch is a fix for the same. The output after we apply this patch is: Reading symbols from //gdb_tests/multi-thread-fork... (gdb) set detach-on-fork off (gdb) r Starting program: /gdb_tests/multi-thread-fork [New Thread 258 (tid 75565441)] [New Thread 515 (tid 63244397)] [New inferior 2 (process 10813892)] Hello from Parent! [New inferior 3 (process 19005888)] Hello from Parent! Thread 1.1 received signal SIGINT, Interrupt. 0xd0611d70 in _p_nsleep () from /usr/lib/libpthread.a(_shr_xpg5.o) (gdb) info threads Id Target Id Frame * 1.1 Thread 1 (tid 66062355) ([running]) 0xd0611d70 in _p_nsleep () from /usr/lib/libpthread.a(_shr_xpg5.o) 1.2 Thread 258 (tid 75565441) ([running]) thread_function (arg=0x0) at //gdb_tests/multi-thread-fork.c:50 1.3 Thread 515 (tid 63244397) ([running]) thread_function (arg=0x0) at //gdb_tests/multi-thread-fork.c:50 2.1 Thread 515 (tid 32113089) ([running]) 0xd0610df0 in _sigsetmask () from /usr/lib/libpthread.a(_shr_xpg5.o) 3.1 Thread 258 (tid 64489699) ([running]) 0xd0610df0 in _sigsetmask () from /usr/lib/libpthread.a(_shr_xpg5.o) (gdb) q A debugging session is active. |
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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.