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Re: gdb doesnt show nptl threads

From: "Srinivas Murthy" <codevana at gmail dot com>
To: "Doug Evans" <dje at google dot com>
Cc: gdb at sourceware dot org
Date: Thu, 12 Jun 2008 12:08:53 -0700
Subject: Re: gdb doesnt show nptl threads
References: <df1bdeb10806110019u4ce7cff1pb838d26166089df2@mail.gmail.com> <e394668d0806110758y7bf95cc7mdf9a603fa6d84789@mail.gmail.com> <df1bdeb10806111438h2c33a5afq77d41eb6980ab90d@mail.gmail.com>

Guys,
 Any thoughts on what I might be missing here?

Thanks.

On Wed, Jun 11, 2008 at 2:38 PM, Srinivas Murthy <codevana@gmail.com> wrote:
> Here's the snapshot of the session (I've attached the code for the
> appln "thread"  I'm running). I'm building it w/ gcc -Wall
> -D_REENTRANT -g -o thread main.c -lpthread).
>
>
> # ls -l /lib64/libpthread
> libpthread-2.3.6.so  libpthread.so.0
>
> # gdb64 thread
> GNU gdb 6.6
> Copyright (C) 2006 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "x86_64-unknown-linux-gnu"...
> Using host libthread_db library "/lib64/libthread_db.so.1".
> (gdb) break main
> Breakpoint 1 at 0x4006e0: file main.c, line 29.
> (gdb) r
> Starting program: thread
> Failed to read a valid object file image from memory.
>
> Breakpoint 1, main () at main.c:29
> 29      main.c: No such file or directory.
>        in main.c
> (gdb) n
> 30      in main.c
> (gdb) n
> 29      in main.c
> (gdb)
> Thread ID1075841376: X is now 1.
> Thread ID1075841376: X is now 2.
> Thread ID1075841376: X is now 3.
> Thread ID1075841376: X is now 4.
> Thread ID1075841376: X is now 5.
> Thread ID1075841376: X is now 6.
> Thread ID1075841376: X is now 7.
> Thread ID1075841376: X is now 8.
> Thread ID1075841376: X is now 9.
> Thread ID1075841376: X is now 10.
> 30      in main.c
>
> (gdb)
> Thread ID1075841376: X is now 11.
> Thread ID1075841376: X is now 12.
> Thread ID1075841376: X is now 13.
> Thread ID1075841376: X is now 14.
> Thread ID1075841376: X is now 15.
> Thread ID1075841376: X is now 16.
> Thread ID1075841376: X is now 17.
> Thread ID1075841376: X is now 18.
> Thread ID1075841376: X is now 19.
> Thread ID1075841376: X is now 20.
> Thread ID1075841376: X is now 21.
> Thread ID1075841376: X is now 22.
> Thread ID1075841376: X is now 23.
> Thread ID1075841376: X is now 24.
> Thread ID1075841376: X is now 25.
> Thread ID1075841376: X is now 26.
> Thread ID1075841376: X is now 27.
> Thread ID1075841376: X is now 28.
> Thread ID1075841376: X is now 29.
> Thread ID1075841376: X is now 30.
> Thread ID1075841376: X is now 31.
> Thread ID1075841376: X is now 32.
> Thread ID1075841376: X is now 33.
> Thread ID1075841376: X is now 34.
> Thread ID1075841376: X is now 35.
> Thread ID1075841376: X is now 36.
> Thread ID1075841376: X is now 37.
> Thread ID1075841376: X is now 38.
> Thread ID1075841376: X is now 39.
> Thread ID1075841376: X is now 40.
> Thread ID1075841376: X is now 41.
> Thread ID1075841376: X is now 42.
> Thread ID1075841376: X is now 43.
> Thread ID1075841376: X is now 44.
> Thread ID1075841376: X is now 45.
> Thread ID1075841376: X is now 46.
> Thread ID1075841376: X is now 47.
> Thread ID1075841376: X is now 48.
> Thread ID1075841376: X is now 49.
> Thread ID1075841376: X is now 50.
> Thread ID1075841376: X is now 51.
> Thread ID1075841376: X is now 52.
> Thread ID1075841376: X is now 53.
> Thread ID1075841376: X is now 54.
> Thread ID1075841376: X is now 55.
> Thread ID1075841376: X is now 56.
> Thread ID1075841376: X is now 57.
> Thread ID1075841376: X is now 58.
> Thread ID1075841376: X is now 59.
> Thread ID1075841376: X is now 60.
> Thread ID1075841376: X is now 61.
> Thread ID1075841376: X is now 62.
> Thread ID1075841376: X is now 63.
> Thread ID1075841376: X is now 64.
> Thread ID1075841376: X is now 65.
> Thread ID1075841376: X is now 66.
> Thread ID1075841376: X is now 67.
> Thread ID1075841376: X is now 68.
> Thread ID1075841376: X is now 69.
> Thread ID1075841376: X is now 70.
> Thread ID1075841376: X is now 71.
> Thread ID1075841376: X is now 72.
> Thread ID1075841376: X is now 73.
> Thread ID1075841376: X is now 74.
> Thread ID1075841376: X is now 75.
> Thread ID1075841376: X is now 76.
> Thread ID1075841376: X is now 77.
> Thread ID1075841376: X is now 78.
> Thread ID1075841376: X is now 79.
> Thread ID1075841376: X is now 80.
> Thread ID1075841376: X is now 81.
> Thread ID1075841376: X is now 82.
> Thread ID1075841376: X is now 83.
> Thread ID1075841376: X is now 84.
> Thread ID1075841376: X is now 85.
> Thread ID1075841376: X is now 86.
> Thread ID1075841376: X is now 87.
> Thread ID1075841376: X is now 88.
> Thread ID1075841376: X is now 89.
> Thread ID1075841376: X is now 90.
> Thread ID1075841376: X is now 91.
> Thread ID1075841376: X is now 92.
> Thread ID1075841376: X is now 93.
> Thread ID1075841376: X is now 94.
> Thread ID1075841376: X is now 95.
> Thread ID1075841376: X is now 96.
> Thread ID1075841376: X is now 97.
> Thread ID1075841376: X is now 98.
> Thread ID1075841376: X is now 99.
> Thread ID1075841376: X is now 100.
> Thread ID1075841376: X is now 101.
> Thread ID1075841376: X is now 102.
> Thread ID1075841376: X is now 103.
> Thread ID1075841376: X is now 104.
> Thread ID1075841376: X is now 105.
> 29      in main.c
> (gdb) info threads
> (gdb) n
> Thread ID1077942624: X is now 106.
> Thread ID1077942624: X is now 107.
> Thread ID1077942624: X is now 108.
> Thread ID1077942624: X is now 109.
> Thread ID1077942624: X is now 110.
> Thread ID1077942624: X is now 111.
> Thread ID1077942624: X is now 112.
> Thread ID1077942624: X is now 113.
> 30      in main.c
> (gdb) n
> Thread ID1077942624: X is now 114.
> Thread ID1077942624: X is now 115.
> Thread ID1077942624: X is now 116.
> Thread ID1077942624: X is now 117.
> Thread ID1077942624: X is now 118.
> Thread ID1077942624: X is now 119.
> Thread ID1077942624: X is now 120.
> Thread ID1077942624: X is now 121.
> Thread ID1077942624: X is now 122.
> Thread ID1077942624: X is now 123.
> Thread ID1077942624: X is now 124.
> Thread ID1077942624: X is now 125.
> Thread ID1077942624: X is now 126.
> Thread ID1077942624: X is now 127.
> Thread ID1077942624: X is now 128.
> Thread ID1077942624: X is now 129.
> Thread ID1077942624: X is now 130.
> Thread ID1077942624: X is now 131.
> Thread ID1077942624: X is now 132.
> Thread ID1077942624: X is now 133.
> Thread ID1077942624: X is now 134.
> Thread ID1077942624: X is now 135.
> Thread ID1077942624: X is now 136.
> Thread ID1075841376: X is now 137.
> Thread ID1075841376: X is now 138.
> Thread ID1075841376: X is now 139.
> Thread ID1075841376: X is now 140.
> Thread ID1075841376: X is now 141.
> Thread ID1075841376: X is now 142.
> Thread ID1075841376: X is now 143.
> Thread ID1077942624: X is now 144.
> 29      in main.c
> (gdb) n
> Thread ID1080043872: X is now 145.
> Thread ID1080043872: X is now 146.
> Thread ID1080043872: X is now 147.
> Thread ID1080043872: X is now 148.
> Thread ID1080043872: X is now 149.
> Thread ID1080043872: X is now 150.
> 30      in main.c
> (gdb)
> Thread ID1080043872: X is now 151.
> Thread ID1080043872: X is now 152.
> Thread ID1080043872: X is now 153.
> Thread ID1077942624: X is now 154.
> Thread ID1077942624: X is now 155.
> Thread ID1077942624: X is now 156.
> Thread ID1077942624: X is now 157.
> Thread ID1077942624: X is now 158.
> Thread ID1077942624: X is now 159.
> Thread ID1077942624: X is now 160.
> Thread ID1077942624: X is now 161.
> Thread ID1080043872: X is now 162.
> Thread ID1080043872: X is now 163.
> Thread ID1080043872: X is now 164.
> Thread ID1080043872: X is now 165.
> Thread ID1080043872: X is now 166.
> Thread ID1080043872: X is now 167.
> Thread ID1080043872: X is now 168.
> Thread ID1080043872: X is now 169.
> Thread ID1080043872: X is now 170.
> Thread ID1080043872: X is now 171.
> Thread ID1080043872: X is now 172.
> Thread ID1080043872: X is now 173.
> Thread ID1080043872: X is now 174.
> Thread ID1080043872: X is now 175.
> Thread ID1080043872: X is now 176.
> Thread ID1080043872: X is now 177.
> Thread ID1080043872: X is now 178.
> Thread ID1080043872: X is now 179.
> 29      in main.c
> (gdb) info threads
> (gdb) thread 2
> Thread ID 2 not known.
> (gdb) thread 1
> Thread ID 1 not known.
> (gdb) thread 1080043872
> Thread ID 1080043872 not known.
> (gdb) info threads
>
>
> On Wed, Jun 11, 2008 at 7:58 AM, Doug Evans <dje@google.com> wrote:
>> On Wed, Jun 11, 2008 at 12:19 AM, Srinivas Murthy <codevana@gmail.com> wrote:
>>> Hi,
>>> I have the following setup:
>>>  gdb6.6 built using a 64b glibc w/ nptl enabled
>>>  64b glibc - 2.3.6 (nptl enabled)
>>>
>>> When I use gdb on a sample multi-threaded (nptl) app, I cant get any
>>> thread specific gdb cmds to work.
>>>
>>> For ex. info threads shows only one thread (the main thread).
>>>
>>> Any idea what might be going wrong?
>>
>> Unlikely, but one thing that could explain this is the glibc you're
>> using is a hand-made one installed in some place other than /lib64.
>> gdb will only look for libthread_db in a few specific places.
>>
>> A copy of the session log from the start up until the error could help
>> diagnosis.
>>
>

Follow-Ups:
- Re: gdb doesnt show nptl threads
  - From: Srinivas Murthy

References:
- gdb doesnt show nptl threads
  - From: Srinivas Murthy
- Re: gdb doesnt show nptl threads
  - From: Doug Evans
- Re: gdb doesnt show nptl threads
  - From: Srinivas Murthy

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