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Andrew Burgess 3be966f69d gdb/testsuite: Fix race condition in gdb.base/skip.exp
In this commit:

  commit 5024637fac
  Date:   Sun Dec 15 11:05:47 2019 +0100

      Fix skip.exp test failure observed with gcc-9.2.0

A race condition was introduced into the gdb.base/skip.exp test when
this line:

    gdb_test "step" "foo \\(\\) at.*" "step 3"

Was changed to this:

    gdb_test "step" "foo \\(\\) at.*" "step 3" "main \\(\\) at .*" "step"

Before the above change we expected GDB to behave like this:

  (gdb) step
  foo () at /path/to/gdb/testsuite/gdb.base/skip.c:42
  42        return 0;
  (gdb)

However, when the test is compiled with GCC 9.2.0 we get a different
behaviour, and so we need a second 'step', like this:

  (gdb) step
  main () at /path/to/gdb.base/skip.c:32
  32        x = baz ((bar (), foo ()));
  (gdb) step
  foo () at /path/to/gdb/testsuite/gdb.base/skip.c:42
  42        return 0;
  (gdb)

Now the change to the test matches against 'main () at .*', however if
GDB or expect is being slow then we might only get to see output like
this:

  (gdb) step
  main () at /path/to/g

This will happily match the question pattern, so we send 'step' to GDB
again.  Now GDB continues to produce output which expect accepts, we
now see this:

  b.base/skip.c:32
  32        x = baz ((bar (), foo ()));
  (gdb)

This has carried on from where the previous block of output left off.
This doesn't match the final pattern 'foo \\(\\) at.*', but it does
match the prompt pattern that gdb_test_multiple adds, and so we report
the test as failing.

The solution is to simply ensure that the question consumes everything
up to, and including the prompt.  This ensures that the prompt can't
then match the failure case.  The new test line becomes:

    gdb_test "step" "foo \\(\\) at.*" "step 3" \
       "main \\(\\) at .*\r\n$gdb_prompt " "step"

gdb/testsuite/ChangeLog:

	* gdb.base/skip.exp: Fix race condition in test.

Change-Id: I9f0b0b52ef1b4f980bfaa8fe405ff06d520f3482
2020-01-09 22:55:05 +00:00
bfd Fix an illegal memory access triggered when trying to examine an input file containing corrupt compressed sections. 2020-01-09 15:49:08 +00:00
binutils Fix an attempt to free a static pointer when using objcopy's symbol addition feature. 2020-01-09 16:51:04 +00:00
config Add support for debuginfod to the binutils (disable by default, enabled via a configure time option). 2020-01-09 13:19:20 +00:00
contrib contrib: Update dg-extract-results.* from gcc 2019-10-21 15:26:48 +01:00
cpu ubsan: m32c: left shift of negative value 2020-01-06 21:53:51 +10:30
elfcpp Re: Update year range in copyright notice of binutils files 2020-01-01 18:55:18 +10:30
etc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
gas Fix compile time warnings about comparisons always being false. 2020-01-09 11:49:18 +00:00
gdb gdb/testsuite: Fix race condition in gdb.base/skip.exp 2020-01-09 22:55:05 +00:00
gnulib Update copyright year range in all GDB files. 2020-01-01 10:20:53 +04:00
gold Re: Update year range in copyright notice of binutils files 2020-01-01 18:55:18 +10:30
gprof Add support for the GBZ80, Z180, and eZ80 variants of the Z80 architecure. Add an ELF based target for these as well. 2020-01-02 14:14:59 +00:00
include [ARC] Add finer details for LLOCK and SCOND 2020-01-07 15:25:34 +02:00
intl Change version to 2.32.51 and regenerate configure and pot files. 2019-01-19 16:51:42 +00:00
ld Re: Prefer object over notype symbols when disassembling 2020-01-07 09:34:52 +10:30
libctf Fix libctf ChangeLog date in most recent entry. 2020-01-05 09:53:14 +04:00
libdecnumber Merge config/ changes from GCC. 2018-10-31 17:16:41 +00:00
libiberty Synchronize libiberty sources with gcc mainline. 2019-08-09 16:16:18 +01:00
opcodes Fix the cast used to prevent compile time warning about an always false test. 2020-01-09 14:32:49 +00:00
readline Fix compilation of Readline on mingw.org's MinGW 2019-12-23 16:28:32 +02:00
sim Update copyright year range in all GDB files. 2020-01-01 10:20:53 +04:00
texinfo
zlib Merge config/ changes from GCC. 2018-10-31 17:16:41 +00:00
.cvsignore
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.gitignore Add profiling outputs to .gitignore 2019-12-26 06:54:58 +01:00
ar-lib Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
ChangeLog oops - toplevel changelog entry for previous delta. 2020-01-09 13:37:26 +00:00
compile Update from upstream Automake 2014-11-16 13:43:48 +01:00
config-ml.in Update top level configure files by synchronizing them with gcc. 2018-01-10 15:29:21 +00:00
config.guess config.guess,config.sub: synchronize with config project master sources 2019-05-23 18:19:56 +02:00
config.rpath
config.sub config.guess,config.sub: synchronize with config project master sources 2019-05-23 18:19:56 +02:00
configure Add support for debuginfod to the binutils (disable by default, enabled via a configure time option). 2020-01-09 13:19:20 +00:00
configure.ac Add support for debuginfod to the binutils (disable by default, enabled via a configure time option). 2020-01-09 13:19:20 +00:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS Update the address of the FSF in the copyright notice of files which were using the old address. 2017-12-14 12:48:55 +00:00
COPYING.NEWLIB
depcomp Update from upstream Automake 2014-11-16 13:43:48 +01:00
djunpack.bat
install-sh Update from upstream Automake 2014-11-16 13:43:48 +01:00
libtool.m4 Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS Move gnulib to top level 2019-06-14 12:40:02 -06:00
Makefile.def gdb: CTF support 2019-10-07 02:26:27 +00:00
Makefile.in gdb: CTF support 2019-10-07 02:26:27 +00:00
Makefile.tpl Revert "Sync top level files with versions from gcc." 2019-05-30 11:17:19 +01:00
makefile.vms
missing Update from upstream Automake 2014-11-16 13:43:48 +01:00
mkdep
mkinstalldirs Update from upstream Automake 2014-11-16 13:43:48 +01:00
move-if-change Update `move-if-change' from gnulib 2014-11-16 17:04:02 +01:00
multilib.am Merge autoconf / automake update changes from GCC. 2018-10-31 17:10:56 +00:00
README
README-maintainer-mode Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
setup.com
src-release.sh Add libctf to src-release.sh:GDB_SUPPORT_DIRS 2019-10-17 14:00:51 -04:00
symlink-tree
test-driver Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
ylwrap Update from upstream Automake 2014-11-16 13:43:48 +01:00

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