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Re: gdb doesnt show nptl threads
>From this posting here https://issues.rpath.com/browse/RPL-1592 it
seems like this is a bug in the glibc 2.3.6 that I have.
Is that right? Do I have to update the glibc (which is very difficult
to do)? Wondering if there is an easier fix for this.
Thanks.
On Thu, Jun 12, 2008 at 12:08 PM, Srinivas Murthy <codevana@gmail.com> wrote:
> 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.
>>>
>>
>