Re: [PATCH] Warn users about mismatched PID namespaces

[Daniel Colascione <dancol@dancol.org>]

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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? There's some talk on LKML of adding the necessary system call, but it's not in-tree yet.


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