NetBSD Problem Report #51678

From martin@duskware.de  Thu Dec  1 08:39:55 2016
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From: martin@NetBSD.org
Reply-To: martin@NetBSD.org
To: gnats-bugs@NetBSD.org
Subject: gdb can't run threaded programs
X-Send-Pr-Version: 3.95

>Number:         51678
>Category:       port-alpha
>Synopsis:       gdb can't run threaded programs
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-alpha-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Dec 01 08:40:00 +0000 2016
>Last-Modified:  Thu Dec 01 16:15:01 +0000 2016
>Originator:     Martin Husemann
>Release:        NetBSD 7.99.43
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD gemini.duskware.de 7.99.43 NetBSD 7.99.43 (GENERIC-$Revision: 1.371 $) #34: Tue Nov 29 16:32:43 CET 2016 martin@martins.aprisoft.de:/ssd/src/sys/arch/alpha/compile/GENERIC alpha
Architecture: alpha
Machine: alpha
>Description:

Trying to run a pthreaded program under gdb fails:

[~] martin@gemini > gdb dig
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 "alpha--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 dig...Reading symbols from /usr/libdata/debug//usr/bin/dig.debug...done.
done.
(gdb) run
Starting program: /usr/bin/dig 
[New LWP 4]
[New LWP 3]
[New LWP 2]

Thread 1 received signal SIGTRAP, Trace/breakpoint trap.
[Switching to LWP 1]
0x000003fffd44d968 in _sys___kevent50 () from /usr/lib/libc.so.12


>How-To-Repeat:
s/a

>Fix:
n/a

>Audit-Trail:
From: Kamil Rytarowski <n54@gmx.com>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: port-alpha/51678: gdb can't run threaded programs
Date: Thu, 1 Dec 2016 16:50:52 +0100

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 Message-ID: <03e022e4-6854-da30-0504-75ce5ba16e54@gmx.com>
 Subject: Re: port-alpha/51678: gdb can't run threaded programs
 References: <pr-port-alpha-51678@gnats.netbsd.org>
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 On 01.12.2016 09:40, martin@NetBSD.org wrote:
 >> Number:         51678
 >> Category:       port-alpha
 >> Synopsis:       gdb can't run threaded programs
 >> Confidential:   no
 >> Severity:       critical
 >> Priority:       high
 >> Responsible:    port-alpha-maintainer
 >> State:          open
 >> Class:          sw-bug
 >> Submitter-Id:   net
 >> Arrival-Date:   Thu Dec 01 08:40:00 +0000 2016
 >> Originator:     Martin Husemann
 >> Release:        NetBSD 7.99.43
 >> Organization:
 > The NetBSD Foundation, Inc.
 >> Environment:
 > System: NetBSD gemini.duskware.de 7.99.43 NetBSD 7.99.43 (GENERIC-$Revi=
 sion: 1.371 $) #34: Tue Nov 29 16:32:43 CET 2016 martin@martins.aprisoft.=
 de:/ssd/src/sys/arch/alpha/compile/GENERIC alpha
 > Architecture: alpha
 > Machine: alpha
 >> Description:
 >=20
 > Trying to run a pthreaded program under gdb fails:
 >=20
 > [~] martin@gemini > gdb dig
 > 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=
 =2Ehtml>
 > This is free software: you are free to change and redistribute it.
 > There is NO WARRANTY, to the extent permitted by law.  Type "show copyi=
 ng"
 > and "show warranty" for details.
 > This GDB was configured as "alpha--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 dig...Reading symbols from /usr/libdata/debug//usr=
 /bin/dig.debug...done.
 > done.
 > (gdb) run
 > Starting program: /usr/bin/dig=20
 > [New LWP 4]
 > [New LWP 3]
 > [New LWP 2]
 >=20
 > Thread 1 received signal SIGTRAP, Trace/breakpoint trap.
 > [Switching to LWP 1]
 > 0x000003fffd44d968 in _sys___kevent50 () from /usr/lib/libc.so.12
 >=20
 >=20
 >> How-To-Repeat:
 > s/a
 >=20
 >> Fix:
 > n/a
 >=20

 Please try to bisect src/lib/libpthread_dbg/pthread_dbg.c between 1.44
 and HEAD (1.51).

 Only this file, no other file should be changed (if I remember correctly
 the newest pthread_dbg.h is compatible with all versions between these
 revisions).


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From: Martin Husemann <martin@duskware.de>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: port-alpha/51678: gdb can't run threaded programs
Date: Thu, 1 Dec 2016 17:11:05 +0100

 On Thu, Dec 01, 2016 at 04:00:02PM +0000, Kamil Rytarowski wrote:
 >  Please try to bisect src/lib/libpthread_dbg/pthread_dbg.c between 1.44
 >  and HEAD (1.51).

 It is not libpthread_dbg.

 Martin

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