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If all threads in the target were already running when the user does "c -a", nothing puts the inferior's terminal settings in effect and removes stdin from the event loop, which we must when running a foreground command. The result is that user input afterwards crashes readline/gdb: (gdb) start Temporary breakpoint 1 at 0x4005d4: file continue-all-already-running.c, line 23. Starting program: continue-all-already-running Temporary breakpoint 1, main () at continue-all-already-running.c:23 23 sleep (10); (gdb) c -a& Continuing. (gdb) c -a Continuing. p 1 readline: readline_callback_read_char() called with no handler! Aborted (core dumped) $ Backtrace: Program received signal SIGABRT, Aborted. 0x0000003b36a35877 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56 56 return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig); (top-gdb) p 1 $1 = 1 (top-gdb) bt #0 0x0000003b36a35877 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56 #1 0x0000003b36a36f68 in __GI_abort () at abort.c:89 #2 0x0000000000784aa9 in rl_callback_read_char () at readline/callback.c:116 #3 0x0000000000619181 in rl_callback_read_char_wrapper (client_data=0x0) at gdb/event-top.c:167 #4 0x0000000000619557 in stdin_event_handler (error=0, client_data=0x0) at gdb/event-top.c:373 #5 0x000000000061814a in handle_file_event (data=...) at gdb/event-loop.c:763 #6 0x0000000000617631 in process_event () at gdb/event-loop.c:340 #7 0x00000000006176f8 in gdb_do_one_event () at gdb/event-loop.c:404 #8 0x0000000000617748 in start_event_loop () at gdb/event-loop.c:429 #9 0x00000000006191b3 in cli_command_loop (data=0x0) at gdb/event-top.c:182 #10 0x000000000060f538 in current_interp_command_loop () at gdb/interps.c:318 #11 0x0000000000610701 in captured_command_loop (data=0x0) at gdb/main.c:323 #12 0x000000000060c3f5 in catch_errors (func=0x6106e6 <captured_command_loop>, func_args=0x0, errstring=0x9002c1 "", mask=RETURN_MASK_ALL) at gdb/exceptions.c:237 #13 0x0000000000611bff in captured_main (data=0x7fffffffd780) at gdb/main.c:1151 #14 0x000000000060c3f5 in catch_errors (func=0x610afe <captured_main>, func_args=0x7fffffffd780, errstring=0x9002c1 "", mask=RETURN_MASK_ALL) at gdb/exceptions.c:237 #15 0x0000000000611c28 in gdb_main (args=0x7fffffffd780) at gdb/main.c:1159 #16 0x000000000045ef97 in main (argc=5, argv=0x7fffffffd888) at gdb/gdb.c:32 (top-gdb) Tested on x86_64 Fedora 20, native and gdbserver. gdb/ 2014-10-17 Pedro Alves <palves@redhat.com> PR gdb/17300 * infcmd.c (continue_1): If continuing all threads in the foreground, make sure the inferior's terminal settings are put in effect. gdb/testsuite/ 2014-10-17 Pedro Alves <palves@redhat.com> PR gdb/17300 * gdb.base/continue-all-already-running.c: New file. * gdb.base/continue-all-already-running.exp: New file.
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.