[Bug testsuite/12649] New: reproducer for races of expect incomplete reads

[Bug testsuite/12649] New: reproducer for races of expect incomplete reads

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

           Summary: reproducer for races of expect incomplete reads
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: testsuite
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com
            Blocks: 12647
            Target: i686-fedora15-linux-gnu


Created attachment 5649
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5649
PASSes->FAILs after this reproducer.

Excercise any incomplete reads handling in the testsuite by simulating read()
always returns just 1 character.

#define _GNU_SOURCE 1
#include <dlfcn.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
ssize_t
read (int fd, void *buf, size_t count)
{
  static ssize_t (*read2) (int fd, void *buf, size_t count) = NULL;
  if (read2 == NULL)
    {
      unsetenv ("LD_PRELOAD");
      read2 = dlsym (RTLD_NEXT, "read");
    }
  if (count > 0 && isatty (fd) >= 1)
    count = 1;
  return read2 (fd, buf, count);
}

gcc -o /usr/local/lib/read1.so read1.c -Wall -g -shared -fPIC

/usr/local/bin/runtest:
#! /bin/sh
export EXPECT=/usr/local/bin/expect-read1
exec /usr/bin/runtest "$@"

/usr/local/bin/expect-read1:
#! /bin/sh
export LD_PRELOAD=/usr/local/lib/read1.so
exec /usr/bin/expect "$@"

-# of expected passes           19875
+# of expected passes           19701
-# of unexpected failures       69
+# of unexpected failures       173
+# of unknown successes         9
+# of known failures            71
+# of unresolved testcases      9

(Some of the differences in the attachment may be unrelated to this Bug.)

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #1 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-04-07 08:16:10 UTC ---
*** Bug 12647 has been marked as a duplicate of this bug. ***

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #2 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-04-07 08:22:00 UTC ---
Created attachment 5650
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5650
gdb_test_timeout *= 20

And be careful with multiarch, /usr/local/lib/read1.so has only single arch.

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[pedro at codesourcery dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

Pedro Alves <pedro at codesourcery dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pedro at codesourcery dot
                   |                            |com

--- Comment #3 from Pedro Alves <pedro at codesourcery dot com> 2011-04-07 10:35:19 UTC ---
Brilliant!

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[mpolacek at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

Marek Polacek <mpolacek at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at redhat dot com
         AssignedTo|unassigned at sourceware    |mpolacek at redhat dot com
                   |dot org                     |

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2011-05-02 17:52:31 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    palves@sourceware.org    2011-05-02 17:52:28

Modified files:
    gdb/testsuite  : ChangeLog 
    gdb/testsuite/gdb.base: completion.exp 

Log message:
    2011-05-02  Pedro Alves  <pedro@codesourcery.com>

    PR testsuite/12649
    Fix races.

    * gdb.base/completion.exp: Remove all sleep calls.  Remove
    unnecessary regexs.  Don't explicitly expect anything after the
    prompt.  Eat the prompt if necessary.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.2687&r2=1.2688
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.base/completion.exp.diff?cvsroot=src&r1=1.50&r2=1.51

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[mpolacek at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

Marek Polacek <mpolacek at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #5 from Marek Polacek <mpolacek at redhat dot com> 2011-05-27 14:41:18 UTC ---
Just a little status report, where are we at.

These tests were already race-fixed:
 * gdb.base/commands.exp
 * gdb.base/completion.exp
 * gdb.base/pointers.exp
 * gdb.base/pr10179.exp
 * gdb.base/setshow.exp
 * gdb.cp/cpcompletion.exp
 * gdb.cp/static-print-quit.exp
 * gdb.mi/mi-basics.exp
 * gdb.mi/mi-nonstop-exit.exp
 * gdb.mi/mi-nonstop.exp
 * gdb.mi/mi-ns-stale-regcache.exp
 * gdb.mi/mi-nsthrexec.exp

Remaining:
 * gdb.mi/mi-nsintrall.exp
 * gdb.mi/mi-nsmoribund.exp
 * gdb.mi/mi-return.exp
 * gdb.mi/mi-var-display.exp
 * gdb.mi/mi2-basics.exp
 * gdb.mi/mi2-console.exp
 * gdb.mi/mi2-return.exp
 * gdb.mi/mi2-var-display.exp
 * gdb.python/py-evthreads.exp
 * gdb.python/python.exp

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[jan.kratochvil at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #6 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2011-10-29 14:00:24 UTC ---
Created attachment 6039
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6039
writew: A different reproducer - delaying the GDB writes.

It could reproduce:
FAIL: gdb.mi/mi-nonstop.exp: breakpoint at marker
from:
[patch] testsuite: MI: racy results in async mode #2
http://sourceware.org/ml/gdb-patches/2011-10/msg00797.html

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2011-11-25 23:50:21 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    jkratoch@sourceware.org    2011-11-25 23:50:16

Modified files:
    gdb/testsuite  : ChangeLog 
    gdb/testsuite/gdb.reverse: i386-sse-reverse.exp 

Log message:
    gdb/testsuite/
    PR testsuite/12649
    * gdb.reverse/i386-sse-reverse.exp (continue to end of sse_test #2):
    Wrap send_gdb into a new gdb_test.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.2946&r2=1.2947
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.reverse/i386-sse-reverse.exp.diff?cvsroot=src&r1=1.6&r2=1.7

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #8 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2011-12-02 12:43:34 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    jkratoch@sourceware.org    2011-12-02 12:43:30

Modified files:
    gdb/testsuite  : ChangeLog 
    gdb/testsuite/gdb.trace: collection.exp tspeed.exp tstatus.exp 

Log message:
    gdb/testsuite/
    PR testsuite/12649
    * gdb.trace/collection.exp (gdb_collect_return_test): Import gdb_prompt.
    Protect gdb_test_multiple by final $gdb_prompt match.
    * gdb.trace/tspeed.exp (gdb_fast_trace_speed_test): Likewise.
    * gdb.trace/tstatus.exp (run_trace_experiment): Likewise.
    (test_tracepoints): Likewise.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.2955&r2=1.2956
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.trace/collection.exp.diff?cvsroot=src&r1=1.28&r2=1.29
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.trace/tspeed.exp.diff?cvsroot=src&r1=1.1&r2=1.2
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.trace/tstatus.exp.diff?cvsroot=src&r1=1.1&r2=1.2

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #9 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2011-12-10 23:05:13 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    jkratoch@sourceware.org    2011-12-10 23:05:08

Modified files:
    gdb/testsuite  : ChangeLog 
    gdb/testsuite/gdb.trace: ftrace.exp 

Log message:
    gdb/testsuite/
    PR testsuite/12649
    * gdb.trace/ftrace.exp (test_fast_tracepoints): Import gdb_prompt.
    Protect gdb_test_multiple by final $gdb_prompt match.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.2975&r2=1.2976
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.trace/ftrace.exp.diff?cvsroot=src&r1=1.1&r2=1.2

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #10 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2012-05-15 13:09:06 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    jkratoch@sourceware.org    2012-05-15 13:08:58

Modified files:
    gdb/testsuite  : ChangeLog 
    gdb/testsuite/gdb.base: dprintf.exp 

Log message:
    gdb/testsuite/
    PR testsuite/12649
    * gdb.base/dprintf.exp: Replace gdb_run_cmd by runto main.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.3189&r2=1.3190
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.base/dprintf.exp.diff?cvsroot=src&r1=1.1&r2=1.2

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #11 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2012-07-04 14:57:31 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    jkratoch@sourceware.org    2012-07-04 14:57:24

Modified files:
    gdb/testsuite  : ChangeLog 
    gdb/testsuite/gdb.base: dprintf.exp 

Log message:
    gdb/testsuite/
    PR 12649
    * gdb.base/dprintf.exp (Set dprintf style to agent): Add missing
    gdb_test_multiple $gdb_prompt terminator.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.3274&r2=1.3275
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.base/dprintf.exp.diff?cvsroot=src&r1=1.4&r2=1.5

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #12 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2013-05-21 15:00:34 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    jkratoch@sourceware.org    2013-05-21 15:00:33

Modified files:
    gdb/testsuite  : ChangeLog 
    gdb/testsuite/gdb.mi: mi-dprintf.exp 

Log message:
    gdb/testsuite/
    PR testsuite/12649
    * gdb.mi/mi-dprintf.exp (mi_continue_dprintf): Fix expect strings for
    racy matches.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.3669&r2=1.3670
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.mi/mi-dprintf.exp.diff?cvsroot=src&r1=1.1&r2=1.2

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[polacek at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=12649

Marek Polacek <polacek at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|polacek at redhat dot com          |unassigned at sourceware dot org

--- Comment #14 from Marek Polacek <polacek at redhat dot com> ---
Unassigning.

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=12649

--- Comment #15 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "gdb and binutils".

The branch, master has been updated
       via  2a31c6236de308f7109720230e70b96c5d5b966a (commit)
      from  469a34932ae4208240e98c843b01ea1f00892137 (commit)

Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.

- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2a31c6236de308f7109720230e70b96c5d5b966a

commit 2a31c6236de308f7109720230e70b96c5d5b966a
Author: Pedro Alves <palves@redhat.com>
Date:   Wed Aug 20 18:55:54 2014 +0100

    Integrate PR 12649's race detector directly in the testsuite machinery

    This integrates Jan Kratochvil's nice race reproducer from PR
    testsuite/12649 into the testsuite infrustructure directly.

    With this, one only has to do either 'make check-read1' or 'make check
    READ1="1"' to preload the read1.so library into expect.

    Currently only enabled for glibc/GNU systems, and if
    build==host==target.

    gdb/testsuite/ChangeLog:

        * Makefile.in (EXTRA_RULES, CC): New variables, get from
        configure.
        (EXPECT): Handle READ1 being set.
        (all): Depend on EXTRA_RULES.
        (check-read1, expect-read1, read1.so, read1): New rules.
        * README (Testsuite Parameters): Document the READ1 make variable.
        (Race detection): New section.
        * configure: Regenerate.
        * configure.ac: If build==host==target, and running under a
        GNU/glibc system, add read1 to the extra Makefile rules.
        (EXTRA_RULES): AC_SUBST it.
        * lib/read1.c: New file.

    gdb/ChangeLog:

        * Makefile.in (check-read1): New rule.

-----------------------------------------------------------------------

Summary of changes:
 gdb/ChangeLog                                      |    4 ++
 gdb/Makefile.in                                    |    8 ++++
 gdb/testsuite/ChangeLog                            |   16 +++++++
 gdb/testsuite/Makefile.in                          |   44 ++++++++++++++++++--
 gdb/testsuite/README                               |   41 ++++++++++++++++++
 gdb/testsuite/configure                            |   10 ++++
 gdb/testsuite/configure.ac                         |    9 ++++
 .../expect-read1.c => testsuite/lib/read1.c}       |   16 ++++----
 8 files changed, 136 insertions(+), 12 deletions(-)
 copy gdb/{contrib/expect-read1.c => testsuite/lib/read1.c} (80%)

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=12649

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ssbssa at sourceware dot org

--- Comment #16 from Hannes Domani <ssbssa at sourceware dot org> ---
(In reply to Sourceware Commits from comment #15)
> This is an automated email from the git hooks/post-receive script. It was
> generated because a ref change was pushed to the repository containing
> the project "gdb and binutils".
> 
> The branch, master has been updated
>        via  2a31c6236de308f7109720230e70b96c5d5b966a (commit)
>       from  469a34932ae4208240e98c843b01ea1f00892137 (commit)
> 
> Those revisions listed above that are new to this repository have
> not appeared on any other notification email; so we list those
> revisions in full, below.
> 
> - Log -----------------------------------------------------------------
> https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;
> h=2a31c6236de308f7109720230e70b96c5d5b966a
> 
> commit 2a31c6236de308f7109720230e70b96c5d5b966a
> Author: Pedro Alves <palves@redhat.com>
> Date:   Wed Aug 20 18:55:54 2014 +0100
> 
>     Integrate PR 12649's race detector directly in the testsuite machinery
>     
>     This integrates Jan Kratochvil's nice race reproducer from PR
>     testsuite/12649 into the testsuite infrustructure directly.
>     
>     With this, one only has to do either 'make check-read1' or 'make check
>     READ1="1"' to preload the read1.so library into expect.
>     
>     Currently only enabled for glibc/GNU systems, and if
>     build==host==target.
>     
>     gdb/testsuite/ChangeLog:
>     
>     	* Makefile.in (EXTRA_RULES, CC): New variables, get from
>     	configure.
>     	(EXPECT): Handle READ1 being set.
>     	(all): Depend on EXTRA_RULES.
>     	(check-read1, expect-read1, read1.so, read1): New rules.
>     	* README (Testsuite Parameters): Document the READ1 make variable.
>     	(Race detection): New section.
>     	* configure: Regenerate.
>     	* configure.ac: If build==host==target, and running under a
>     	GNU/glibc system, add read1 to the extra Makefile rules.
>     	(EXTRA_RULES): AC_SUBST it.
>     	* lib/read1.c: New file.
>     
>     gdb/ChangeLog:
>     
>     	* Makefile.in (check-read1): New rule.
> 
> -----------------------------------------------------------------------
> 
> Summary of changes:
>  gdb/ChangeLog                                      |    4 ++
>  gdb/Makefile.in                                    |    8 ++++
>  gdb/testsuite/ChangeLog                            |   16 +++++++
>  gdb/testsuite/Makefile.in                          |   44
> ++++++++++++++++++--
>  gdb/testsuite/README                               |   41 ++++++++++++++++++
>  gdb/testsuite/configure                            |   10 ++++
>  gdb/testsuite/configure.ac                         |    9 ++++
>  .../expect-read1.c => testsuite/lib/read1.c}       |   16 ++++----
>  8 files changed, 136 insertions(+), 12 deletions(-)
>  copy gdb/{contrib/expect-read1.c => testsuite/lib/read1.c} (80%)

Can this be closed?

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[Bug testsuite/12649] reproducer for races of expect incomplete reads

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=12649

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |7.9
                 CC|                            |vries at gcc dot gnu.org
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #17 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Hannes Domani from comment #16)
> Can this be closed?

It can, thanks for the reminder.

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