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GDB hangs when doing this: - launch inferior with multiple threads - multiple threads hit some breakpoint(s) - one breakpoint hit is presented as a stop, the rest are saved as pending wait statuses - "set scheduler-locking on" - resume the currently selected thread (because of scheduler-locking, it's the only one resumed), let it execute until exit - GDB hangs, not showing the prompt, impossible to interrupt with ^C When the resumed thread exits, we expect the target to return a TARGET_WAITKIND_NO_RESUMED event, and that's what we see: [infrun] fetch_inferior_event: enter [infrun] scoped_disable_commit_resumed: reason=handling event [infrun] random_pending_event_thread: None found. [Thread 0x7ffff7d9c700 (LWP 309357) exited] [infrun] print_target_wait_results: target_wait (-1.0.0 [process -1], status) = [infrun] print_target_wait_results: -1.0.0 [process -1], [infrun] print_target_wait_results: status->kind = no-resumed [infrun] handle_inferior_event: status->kind = no-resumed [infrun] handle_no_resumed: TARGET_WAITKIND_NO_RESUMED (ignoring: found resumed) [infrun] prepare_to_wait: prepare_to_wait [infrun] reset: reason=handling event [infrun] maybe_set_commit_resumed_all_targets: not requesting commit-resumed for target native, no resumed threads [infrun] fetch_inferior_event: exit The problem is in handle_no_resumed: we check if some other thread is actually resumed, to see if we should ignore that event (see comments in that function for more info). If this condition is true: (thread->executing () || thread->has_pending_waitstatus ()) ... then we ignore the event. The problem is that there are some non-resumed threads with a pending event, which makes us ignore the event. But these threads are not resumed, so we end up waiting while nothing executes, hence waiting for ever. My first fix was to change the condition to: (thread->executing () || (thread->resumed () && thread->has_pending_waitstatus ())) ... but then it occured to me that we could simply check for: (thread->resumed ()) Since "executing" implies "resumed", checking simply for "resumed" covers threads that are resumed and executing, as well as threads that are resumed with a pending status, which is what we want. Change-Id: Ie796290f8ae7f34c026ca3a8fcef7397414f4780 |
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bfd | ||
binutils | ||
config | ||
contrib | ||
cpu | ||
elfcpp | ||
etc | ||
gas | ||
gdb | ||
gdbserver | ||
gdbsupport | ||
gnulib | ||
gold | ||
gprof | ||
include | ||
intl | ||
ld | ||
libbacktrace | ||
libctf | ||
libdecnumber | ||
libiberty | ||
opcodes | ||
readline | ||
sim | ||
texinfo | ||
zlib | ||
.cvsignore | ||
.gitattributes | ||
.gitignore | ||
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 | ||
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.