Re: [PATCH] Warn users about mismatched PID namespaces

Pedro Alves
2014-10-30T12:49:24Z

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