[PATCH] Warn users about mismatched PID namespaces

Pedro Alves palves@redhat.com
Thu Oct 30 12:49:00 GMT 2014


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 ?

> 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?

Thanks,
Pedro Alves



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