Go to file
Pedro Alves 56cf4bed53 gdbserver resume_stop handling bug
Running attach-many-short-lived-threads.exp with the extended-remote
board with "maint set target-non-stop on" times out -- the attach
never completes.  Enabling infrun debug logs, we see that GDB is stuck
stopping all threads:

 infrun: target_wait (-1.0.0, status) =
 infrun:   1639.22213.0 [Thread 1639.22213],
 infrun:   status->kind = stopped, signal = GDB_SIGNAL_0
 infrun:   Thread 1639.22260 not executing
 infrun:   Thread 1639.22256 not executing
 infrun:   Thread 1639.22258 not executing
 infrun:   Thread 1639.22257 not executing
 infrun:   Thread 1639.22259 not executing
 infrun:   Thread 1639.22255 not executing
 infrun:   Thread 1639.22253 executing, already stopping
 infrun:   Thread 1639.22251 executing, already stopping
 infrun:   Thread 1639.22252 executing, already stopping
 infrun:   Thread 1639.22250 executing, already stopping
 infrun:   Thread 1639.22254 executing, already stopping
 infrun:   Thread 1639.22247 executing, already stopping
 infrun:   Thread 1639.22213 not executing
 infrun:   Thread 1639.22207 not executing
 infrun:   Thread 1639.22201 not executing
 infrun:   Thread 1639.22219 not executing
 infrun:   Thread 1639.1639 not executing
 ** HANG HERE **

GDB is waiting for the stop replies of any of those "already stopping"
threads.  Take 22253 for example.  On the gdbserver logs we see:

 ...
 resume_stop request for LWP 22253
 stopping LWP 22253
 Sending sigstop to lwp 22253
 linux_resume done
 ...

and:

 my_waitpid (-1, 0x40000001)
 my_waitpid (-1, 0x80000001): status(3057f), 22253
 LWFE: waitpid(-1, ...) returned 22253, ERRNO-OK
 LLW: waitpid 22253 received Trace/breakpoint trap (stopped)
 pc is 0x3615ef4ce1
 HEW: Got clone event from LWP 22253, new child is LWP 22259

but from here on, we never see any other event for LWP 22253.  In
particular, we never see the expected SIGSTOP (from "Sending sigstop"
above).  The issue is that linux_resume_stopped_resumed_lwps never
re-resumes the 22253 after the clone event.

gdb/gdbserver/ChangeLog:
2015-11-30  Pedro Alves  <palves@redhat.com>

	* linux-low.c (resume_stopped_resumed_lwps): Don't check whether
	the thread's last_resume_kind was resume_stop.
2015-11-30 18:39:37 +00:00
bfd Automatic date update in version.in 2015-11-30 00:00:08 +00:00
binutils objdump: Handle 32-bit base address in debug_ranges / debug_loc. 2015-11-30 13:28:26 +00:00
config libsanitizer merge from upstream r250806, compiler part. 2015-11-28 16:39:32 +00:00
cpu Remove leading/trailing white spaces in ChangeLog 2015-07-24 04:16:47 -07:00
elfcpp Add assembler, disassembler and linker support for power9. 2015-11-11 19:52:52 -06:00
etc
gas [AArch64][PATCH 3/3] Add floating-point FP16 instructions 2015-11-27 16:32:21 +00:00
gdb gdbserver resume_stop handling bug 2015-11-30 18:39:37 +00:00
gold Adjust local symbol value in relocatable link to be relative to section. 2015-11-25 08:50:41 -08:00
gprof Bump version to 2.26.51 2015-11-14 16:24:39 -08:00
include Port libvtv to Solaris 2015-11-28 16:39:32 +00:00
intl Regen intl/configure 2015-08-31 12:53:36 +09:30
ld MIPS/LD: Fix little-endian mti' and img' ELF emulations 2015-11-20 16:16:40 +00:00
libdecnumber Remove leading/trailing white spaces in ChangeLog 2015-07-24 04:16:47 -07:00
libiberty PR other/61321 - demangler crash on casts in template parameters 2015-11-28 16:39:31 +00:00
opcodes [AArch64][PATCH 3/3] Add floating-point FP16 instructions 2015-11-27 16:32:21 +00:00
readline Revert "Sync readline/ to version 7.0 alpha" 2015-07-25 15:57:00 -04:00
sim Add an AArch64 simulator to GDB. 2015-11-24 08:47:59 +00:00
texinfo
zlib Import zlib 1.2.8 with local change merged in. 2015-11-25 15:14:47 -08:00
.cvsignore
.gitattributes
.gitignore
ChangeLog binutils: add support for arm-*-darwin and aarch64-*-darwin. 2015-11-20 14:53:06 +01:00
compile
config-ml.in Sync toplevel files with GCC 2015-07-27 07:49:05 -07:00
config.guess Sync config.sub and config.guess with GCC 2015-08-07 07:51:39 -07:00
config.rpath
config.sub Sync config.sub and config.guess with GCC 2015-08-07 07:51:39 -07:00
configure binutils: add support for arm-*-darwin and aarch64-*-darwin. 2015-11-20 14:53:06 +01:00
configure.ac binutils: add support for arm-*-darwin and aarch64-*-darwin. 2015-11-20 14:53:06 +01:00
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 Resync files in the binutils repository that are maintained in the gcc repository. 2015-09-30 17:55:16 +01:00
Makefile.in Resync files in the binutils repository that are maintained in the gcc repository. 2015-09-30 17:55:16 +01:00
Makefile.tpl Sync Makefile.tpl with GCC 2015-07-14 09:52:36 -07:00
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
README
README-maintainer-mode
setup.com
src-release.sh Adjust src-release.sh for sim using the gdb create-version.sh. 2015-04-15 04:08:51 +02:00
symlink-tree
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.