Re: [PATCH] Warn users about mismatched PID namespaces

Pedro Alves
2014-11-05T10:55:23Z

On 10/30/2014 01:11 PM, Pedro Alves wrote:
> On 10/30/2014 12:51 PM, Daniel Colascione wrote:
>> On 10/30/2014 12:49 PM, Pedro Alves wrote:
>>> On 10/30/2014 12:32 PM, Daniel Colascione wrote:
>>>> On 10/30/2014 12:23 PM, Pedro Alves wrote:
>>>>> On 10/30/2014 03:07 AM, Daniel Colascione wrote:
>>>>>
>>>>>> diff --git a/gdb/linux-thread-db.c b/gdb/linux-thread-db.c
>>>>>> index 352fac1..4089417 100644
>>>>>> - --- a/gdb/linux-thread-db.c
>>>>>> +++ b/gdb/linux-thread-db.c
>>>>>> @@ -1223,6 +1223,25 @@ thread_db_new_objfile (struct objfile *objfile)
>>>>>> static void
>>>>>> thread_db_inferior_created (struct target_ops *target, int from_tty)
>>>>>> {
>>>>>> + /* If the child is in a different PID namespace, its idea of its PID
>>>>>> + will differ from our idea of its PID. When we scan the child's
>>>>>> + thread list, we'll mistakenly think it has no threads since the
>>>>>> + thread PID fields won't match the PID we give to
>>>>>> + libthread_db. */
>>>>>
>>>>> Why not give libthread_db the right PID then?
>>>>
>>>> How do you suggest find it?
>>>
>>> Isn't it visible somewhere in /proc ?
>>
>> Not AFAICT, but maybe I overlooked something.
>
> Oh well...

FYI, looks like exposing the info in /proc is in the works
as well. I just stumbled uppon this:

https://lkml.org/lkml/2014/11/5/174

Thanks,
Pedro Alves