This is the mail archive of the
gdb-patches@sourceware.org
mailing list for the GDB project.
Re: [PATCH] Warn users about mismatched PID namespaces
- From: Pedro Alves <palves at redhat dot com>
- To: Daniel Colascione <dancol at dancol dot org>, gdb-patches at sourceware dot org
- Date: Wed, 05 Nov 2014 10:55:11 +0000
- Subject: Re: [PATCH] Warn users about mismatched PID namespaces
- Authentication-results: sourceware.org; auth=none
- References: <5451AB7E dot 40709 at dancol dot org> <54522DC7 dot 2090100 at redhat dot com> <54522FE0 dot 9050508 at dancol dot org> <545233C8 dot 4070402 at redhat dot com> <5452345D dot 4040601 at dancol dot org> <5452391C dot 8020709 at redhat dot com>
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