* [Bug threads/9635] Cannot find new threads: generic error
[not found] <bug-9635-4717@http.sourceware.org/bugzilla/>
@ 2011-05-27 5:27 ` john.carter at tait dot co.nz
2011-05-27 5:35 ` john.carter at tait dot co.nz
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From: john.carter at tait dot co.nz @ 2011-05-27 5:27 UTC (permalink / raw)
To: gdb-prs
http://sourceware.org/bugzilla/show_bug.cgi?id=9635
--- Comment #2 from John Carter <john.carter at tait dot co.nz> 2011-05-27 05:26:52 UTC ---
Created attachment 5756
--> http://sourceware.org/bugzilla/attachment.cgi?id=5756
Very short file that "kills gdb".
To compile and demonstrate the bug...
gcc -O0 -g -pthread -o kill_gdb kill_gdb.c
/usr/bin/gdb ./kill_gdb
GNU gdb (GDB) 7.2-ubuntu
Copyright (C) 2010 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 "i686-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /btrfs/johnc/tmp/kill_gdb...done.
(gdb) start
Temporary breakpoint 1 at 0x8048367: file kill_gdb.c, line 7.
Starting program: /btrfs/johnc/tmp/kill_gdb
[Thread debugging using libthread_db enabled]
Cannot find new threads: generic error
(gdb)
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2011-05-27 5:27 ` [Bug threads/9635] Cannot find new threads: generic error john.carter at tait dot co.nz
@ 2011-05-27 5:35 ` john.carter at tait dot co.nz
2011-05-27 10:46 ` pedro at codesourcery dot com
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From: john.carter at tait dot co.nz @ 2011-05-27 5:35 UTC (permalink / raw)
To: gdb-prs
http://sourceware.org/bugzilla/show_bug.cgi?id=9635
John Carter <john.carter at tait dot co.nz> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |john.carter at tait dot
| |co.nz
Version|6.8 |7.2
Severity|enhancement |normal
--- Comment #3 from John Carter <john.carter at tait dot co.nz> 2011-05-27 05:34:33 UTC ---
If file being debugged uses libpthread AND has an external symbol "stack_used"
gdb dies before the debugged program enters "main" with the message...
[Thread debugging using libthread_db enabled]
Cannot find new threads: generic error
In the attached file, for example you change all occurrences of "stack_used" by
"tack_used" and recompile and run gdb executes normally.
If you leave it as "stack_used", gdb dies with an entirely mystifying error
message!
Thanks.
Environment
uname -a
Linux parore 2.6.35-28-generic-pae #50-Ubuntu SMP Fri Mar 18 20:43:15 UTC 2011
i686 GNU/Linux
/usr/bin/gcc --version
gcc (Ubuntu/Linaro 4.4.4-14ubuntu5) 4.4.5
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2011-05-27 5:27 ` [Bug threads/9635] Cannot find new threads: generic error john.carter at tait dot co.nz
2011-05-27 5:35 ` john.carter at tait dot co.nz
@ 2011-05-27 10:46 ` pedro at codesourcery dot com
2011-05-27 10:50 ` pedro at codesourcery dot com
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From: pedro at codesourcery dot com @ 2011-05-27 10:46 UTC (permalink / raw)
To: gdb-prs
http://sourceware.org/bugzilla/show_bug.cgi?id=9635
Pedro Alves <pedro at codesourcery dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at sourceware |pedro at codesourcery dot
|dot org |com
--- Comment #4 from Pedro Alves <pedro at codesourcery dot com> 2011-05-27 10:46:01 UTC ---
Created attachment 5757
--> http://sourceware.org/bugzilla/attachment.cgi?id=5757
fix
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2011-05-27 10:46 ` pedro at codesourcery dot com
@ 2011-05-27 10:50 ` pedro at codesourcery dot com
2011-05-27 11:04 ` gbenson at redhat dot com
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From: pedro at codesourcery dot com @ 2011-05-27 10:50 UTC (permalink / raw)
To: gdb-prs
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--- Comment #5 from Pedro Alves <pedro at codesourcery dot com> 2011-05-27 10:49:48 UTC ---
Thanks for the testcase. It makes the problem dead obvious --- GDB is looking
up symbols in the globally, instead of on the object thread_db requests.
I've attached a proposed fix. My thread_db always passes in a basenamed
obj=libpthread.so.0. Not sure that'll always be the case. Anyone know
otherwise?
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2011-05-27 10:50 ` pedro at codesourcery dot com
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From: gbenson at redhat dot com @ 2011-05-27 11:04 UTC (permalink / raw)
To: gdb-prs
http://sourceware.org/bugzilla/show_bug.cgi?id=9635
Gary Benson <gbenson at redhat dot com> changed:
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----------------------------------------------------------------------------
CC| |gbenson at redhat dot com
--- Comment #6 from Gary Benson <gbenson at redhat dot com> 2011-05-27 11:03:46 UTC ---
Not sure how relevant this is, but there is a function libpthread_name_p
defined in solib.c.
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2011-05-27 11:04 ` gbenson at redhat dot com
@ 2011-05-27 11:08 ` pedro at codesourcery dot com
2011-05-27 12:31 ` gbenson at redhat dot com
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From: pedro at codesourcery dot com @ 2011-05-27 11:08 UTC (permalink / raw)
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--- Comment #7 from Pedro Alves <pedro at codesourcery dot com> 2011-05-27 11:08:00 UTC ---
Yeah, didn't look useful.
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2011-05-27 11:08 ` pedro at codesourcery dot com
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From: gbenson at redhat dot com @ 2011-05-27 12:31 UTC (permalink / raw)
To: gdb-prs
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--- Comment #8 from Gary Benson <gbenson at redhat dot com> 2011-05-27 12:30:06 UTC ---
Fair enough :)
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2011-05-27 12:31 ` gbenson at redhat dot com
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From: pedro at codesourcery dot com @ 2011-06-01 15:48 UTC (permalink / raw)
To: gdb-prs
http://sourceware.org/bugzilla/show_bug.cgi?id=9635
--- Comment #9 from Pedro Alves <pedro at codesourcery dot com> 2011-06-01 15:48:33 UTC ---
The patch breaks thread debugging of threaded static programs. E.g., the
gdb.threads/staticthreads test:
Breakpoint 3, ps_pglobal_lookup (ph=0xf248f8, obj=0x7ffff5b84541
"libpthread.so.0", name=0x7ffff5b84665 "nptl_version", sym_addr=0x7fffffffd5c8)
at ../../src/gdb/proc-service.c:207
207 ALL_OBJFILES (objfile)
There's no libpthread.so loaded by this program, so all symbol lookups
thread_db tries fail...
Any ideas?
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2011-06-01 15:48 ` pedro at codesourcery dot com
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From: pedro at codesourcery dot com @ 2011-06-01 15:54 UTC (permalink / raw)
To: gdb-prs
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--- Comment #10 from Pedro Alves <pedro at codesourcery dot com> 2011-06-01 15:53:25 UTC ---
Is there any reason glibc couldn't move the symbols it wants to check against
to the private namespace (nptl_version ==> __nptl_version, etc.)?
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From: pedro at codesourcery dot com @ 2011-06-01 15:57 UTC (permalink / raw)
To: gdb-prs
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Pedro Alves <pedro at codesourcery dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|pedro at codesourcery dot |unassigned at sourceware
|com |dot org
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2011-06-01 15:57 ` pedro at codesourcery dot com
@ 2011-06-01 15:58 ` pedro at codesourcery dot com
2014-11-20 11:45 ` palves at redhat dot com
2014-11-20 11:46 ` palves at redhat dot com
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From: pedro at codesourcery dot com @ 2011-06-01 15:58 UTC (permalink / raw)
To: gdb-prs
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Pedro Alves <pedro at codesourcery dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |NEW
CC| |pedro at codesourcery dot
| |com
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@ 2014-11-20 11:45 ` palves at redhat dot com
2014-11-20 11:46 ` palves at redhat dot com
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From: palves at redhat dot com @ 2014-11-20 11:45 UTC (permalink / raw)
To: gdb-prs
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Pedro Alves <palves at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |17629
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From: palves at redhat dot com @ 2014-11-20 11:46 UTC (permalink / raw)
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--- Comment #11 from Pedro Alves <palves at redhat dot com> ---
Filed glibc bug: https://sourceware.org/bugzilla/show_bug.cgi?id=17629
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