linux-kernel - Re: debugging threaded apps running under a clone(CLONE

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Date:	Tue, 24 Feb 2009 13:09:40 +0100
From:	Cedric Le Goater <clg@...ibm.com>
To:	Greg Kurz <gkurz@...ibm.com>
CC:	"Serge E. Hallyn" <serue@...ibm.com>,
	Linux Containers <containers@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: debugging threaded apps running under a clone(CLONE_NEWPID)

Greg Kurz wrote:
> On Tue, 2009-02-24 at 10:51 +0100, Cedric Le Goater wrote:
>> Signed-off-by: Cedric Le Goater <clg@...ibm.com>
>> ---
>>  fs/proc/base.c |   19 +++++++++++++++++++
>>  1 file changed, 19 insertions(+)
>>
>> Index: 2.6.27-mcr.git/fs/proc/base.c
>> ===================================================================
>> --- 2.6.27-mcr.git.orig/fs/proc/base.c
>> +++ 2.6.27-mcr.git/fs/proc/base.c
>> @@ -2444,6 +2444,23 @@ static int proc_tgid_io_accounting(struc
>>  }
>>  #endif /* CONFIG_TASK_IO_ACCOUNTING */
>>
>> +static int proc_pid_vpids(struct task_struct *task, char *buffer)
>> +{
>> +	struct pid_namespace *pid_ns = task->nsproxy->pid_ns;
>> +
> 
> This breaks if task is a zombie...

Indeed. I'll be careful to fix this case in the next patch if it becomes more 
than a concept.

Thanks,

C. 
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