NetBSD Problem Report #51636

From www@NetBSD.org  Sat Nov 19 18:21:55 2016
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Message-Id: <20161119182154.4245F7A30E@mollari.NetBSD.org>
Date: Sat, 19 Nov 2016 18:21:54 +0000 (UTC)
From: n54@gmx.com
Reply-To: n54@gmx.com
To: gnats-bugs@NetBSD.org
Subject: It's not possible to run under gdb(1) programs using the pthread_dbg library
X-Send-Pr-Version: www-1.0

>Number:         51636
>Category:       lib
>Synopsis:       It's not possible to run under gdb(1) programs using the pthread_dbg library
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Nov 19 18:25:00 +0000 2016
>Closed-Date:    Fri Oct 06 22:11:28 +0000 2017
>Last-Modified:  Sun Mar 11 23:30:59 +0000 2018
>Originator:     Kamil Rytarowski
>Release:        NetBSD 7.99.42 amd64
>Organization:
TNF
>Environment:
NetBSD chieftec 7.99.42 NetBSD 7.99.42 (GENERIC) #0: Sat Nov 19 18:46:35 CET 2016  root@chieftec:/tmp/netbsd-tmp/sys/arch/amd64/compile/GENERIC amd64
>Description:
Currently the pthread_dbg library cannot be debugged with gdb(1). GDB is a user of this library to handle POSIX threads, it sets pthread__dbg to pid of the debugger and this value is adopted by application - so programs get impression that instance is already attached to an application.

As the result it's not possible to run under gdb(1) programs using the pthread_dbg library
>How-To-Repeat:
$ pwd
/usr/tests/lib/libpthread_dbg
$ atf-run t_dummy |atf-report                                                                                                                       
Tests root: /usr/tests/lib/libpthread_dbg

t_dummy (1/1): 3 test cases
    dummy1: [0.002789s] Passed.
    dummy2: [0.001216s] Passed.
    dummy3: [0.001201s] Passed.
[0.005399s]

Summary for 1 test programs:
    3 passed test cases.
    0 failed test cases.
    0 expected failed test cases.
    0 skipped test cases.
$ ./t_dummy dummy3             
t_dummy: WARNING: Running test cases without atf-run(1) is unsupported
t_dummy: WARNING: No isolation nor timeout control is being applied; you may get unexpected failures; see atf-test-case(4)
Calling td_open(3) for the first time - expecting success
Calling td_open(3) for the first time - expecting in-use
Calling td_close(3) for the first successful call
passed
$ gdb --args ./t_dummy dummy3
GNU gdb (GDB) 7.12
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64--netbsd".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./t_dummy...Reading symbols from /usr/libdata/debug//usr/tests/lib/libpthread_dbg/t_dummy.debug...done.
done.
(gdb) r
Starting program: /usr/tests/lib/libpthread_dbg/t_dummy dummy3
t_dummy: WARNING: Running test cases without atf-run(1) is unsupported
t_dummy: WARNING: No isolation nor timeout control is being applied; you may get unexpected failures; see atf-test-case(4)
Calling td_open(3) for the first time - expecting success
failed: /usr/src/tests/lib/libpthread_dbg/t_dummy.c:113: td_open(&dummy_callbacks, NULL, &main_ta1) == TD_ERR_OK not met
[Inferior 1 (LWP 0) exited with code 01]
(gdb)
>Fix:
N/A

>Release-Note:

>Audit-Trail:
From: Martin Husemann <martin@duskware.de>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: lib/51636: It's not possible to run under gdb(1) programs using the pthread_dbg library
Date: Sat, 19 Nov 2016 20:13:05 +0100

 On Sat, Nov 19, 2016 at 06:25:00PM +0000, n54@gmx.com wrote:
 > As the result it's not possible to run under gdb(1) programs using the pthread_dbg library

 Not sure this would be easy to fix (or worth any complication in the library
 interface) - a "simple" hack around it if you just want to debug something:

  - add a define to rename all entry points slightly (ideally both for lib
    and users)
  - recompile the lib with that macro defined and link it with a different
    target name
  - compile the app with the rename macro and against the renamed lib

 Then you should be able to debug the result just fine.

 Martin

From: Kamil Rytarowski <n54@gmx.com>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: lib/51636: It's not possible to run under gdb(1) programs using
 the pthread_dbg library
Date: Sat, 19 Nov 2016 20:48:57 +0100

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 From: Kamil Rytarowski <n54@gmx.com>
 To: gnats-bugs@NetBSD.org
 Message-ID: <68817afe-de98-6add-fbbe-264f0a452a38@gmx.com>
 Subject: Re: lib/51636: It's not possible to run under gdb(1) programs using
  the pthread_dbg library
 References: <pr-lib-51636@gnats.netbsd.org>
  <20161119182154.4245F7A30E@mollari.NetBSD.org>
  <20161119191501.606B67A310@mollari.NetBSD.org>
 In-Reply-To: <20161119191501.606B67A310@mollari.NetBSD.org>

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 On 19.11.2016 20:15, Martin Husemann wrote:
 > The following reply was made to PR lib/51636; it has been noted by GNAT=
 S.
 >=20
 > From: Martin Husemann <martin@duskware.de>
 > To: gnats-bugs@NetBSD.org
 > Cc:=20
 > Subject: Re: lib/51636: It's not possible to run under gdb(1) programs =
 using the pthread_dbg library
 > Date: Sat, 19 Nov 2016 20:13:05 +0100
 >=20
 >  On Sat, Nov 19, 2016 at 06:25:00PM +0000, n54@gmx.com wrote:
 >  > As the result it's not possible to run under gdb(1) programs using t=
 he pthread_dbg library
 > =20
 >  Not sure this would be easy to fix (or worth any complication in the l=
 ibrary
 >  interface) - a "simple" hack around it if you just want to debug somet=
 hing:
 > =20
 >   - add a define to rename all entry points slightly (ideally both for =
 lib
 >     and users)
 >   - recompile the lib with that macro defined and link it with a differ=
 ent
 >     target name
 >   - compile the app with the rename macro and against the renamed lib
 > =20
 >  Then you should be able to debug the result just fine.
 > =20
 >  Martin
 > =20
 >=20

 I'm aware that there are plenty of ways to walk-around it, like to reset
 pthread__dbg to zero before td_open() and hope it will be good enough. I
 filed this PR to note the issue and as a result get resolved pedantically=
 =2E


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State-Changed-From-To: open->dead
State-Changed-By: kamil@NetBSD.org
State-Changed-When: Sat, 07 Oct 2017 00:11:28 +0200
State-Changed-Why:
libpthread_dbg has been removed from base.


State-Changed-From-To: dead->closed
State-Changed-By: dholland@NetBSD.org
State-Changed-When: Sun, 11 Mar 2018 23:30:59 +0000
State-Changed-Why:
"dead" is for (some) invalid PRs.


>Unformatted:

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