77f4176143
The buildbot shows that some machines FAIL this test frequently. E.g.: https://sourceware.org/ml/gdb-testers/2015-q1/msg00997.html If I stress my machine, I can sometimes see it fail too. Bumping the 200 limit and tweaking the test to show the step count, I get: ... PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 12 times PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 8 times PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 13 times PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 7 times --> FAIL: gdb.base/gdb-sigterm.exp: SIGTERM stepped 228 times <-- PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 11 times PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 13 times PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 12 times PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 8 times PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 9 times PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 7 times PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 11 times PASS: gdb.base/gdb-sigterm.exp: SIGTERM stepped 8 times ... Thinking that this might be a problem of SIGTERM reaching GDB, but then the event loop taking too long to handle it, I hacked GDB to print a debug log whenever the SIGTERM handler was called, and, whenever the event loop finally calls the async SIGTERM handler. Here's what I see: infrun: 30011 [Thread 30011], infrun: status->kind = stopped, signal = GDB_SIGNAL_TRAP infrun: TARGET_WAITKIND_STOPPED infrun: stop_pc = 0x4005de --> infrun: got SIGTERM <-- infrun: stepping inside range [0x4005de-0x4005e0] infrun: resume (step=1, signal=GDB_SIGNAL_0), ... infrun: prepare_to_wait --> infrun: handling async SIGTERM <-- Cannot execute this command while the target is running. Use the "interrupt" command to stop the target and then try again. gdb.base/gdb-sigterm.exp: expect eof #27 FAIL: gdb.base/gdb-sigterm.exp: SIGTERM stepped 228 times So, no delay on the GDB side. It just happens that occasionally it takes more than 200 single-steps before SIGTERM even reaches GDB. This just looks like a kernel/scheduling issue --- some extra usage spike in the system (e.g., an I/O spike) might cause it for me. For the build slaves, I'm guessing they're frequently busy enough to trip on this often. Particularly more so now that we're having them run tests in parallel mode. The fix is to detect failure by timeout instead of counting single steps. This should be more reliable. Indeed for me, after this commit, I couldn't trigger a FAIL anymore, even after letting the test run for an hour. By timeout is also nicer in that a board file for a slow host/target can increase it (like, e.g., an embedded GNU/Linux board). Tested on x86_64 Fedora 20, native, gdbserver, and extended-remote gdbserver. gdb/testsuite/ 2015-02-06 Pedro Alves <palves@redhat.com> * gdb.base/gdb-sigterm.c (main): Use the TIMEOUT define to determine how many seconds to pass to 'alarm'. * gdb.base/gdb-sigterm.exp (top level): Build program with -DTIMEOUT=$timeout. (do_test): Return success/failure indication. Add more verbose logging. Don't fail if 200 single steps are seen. Instead, fail when the test times out. (passes): New global. (top level): Break the testing loop if testing fails on any iteration. Use gdb_assert. |
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README
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.