Re: [PATCH] Warn users about mismatched PID namespaces

[Daniel Colascione <dancol at dancol dot org>]

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.

> 
>> There's some talk on LKML of adding the necessary system call, but it's not in-tree yet.
> 
> Do you have a url handy?

https://lwn.net/Articles/602987/

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