Re: LTP 20080131 causes defunct processes w/2.6.30-rc1 (possible ptrace issue?)

[Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>]

Kumar Gala [galak@kernel.crashing.org] wrote:
>
> On Apr 9, 2009, at 2:49 PM, Sukadev Bhattiprolu wrote:
>
>> Kumar Gala [galak@kernel.crashing.org] wrote:
>>>
>>> On Apr 9, 2009, at 10:43 AM, Kumar Gala wrote:
>>>
>>>> I'm seeing some weird behavior in 2.6.30-rc1 that didn't exist in 
>>>> 2.6.29.
>>>> We have a slightly older LTP version (20080131) that we run on some
>>>> embedded PPC boards.  If I run the syscall tests on 2.6.29 things pass 
>>>> as
>>
>> Will try to repro on a normal machine, but can you attach the 
>> /proc/pid/status
>> (and possibly the stack) of the parent of the 'recv01' ?
>
> Name:   recv01
> State:  Z (zombie)
> Tgid:   2449
> Pid:    2449
> PPid:   1

Ok, but I meant the status of the parent (i.e /proc/1/status in this case).

To get the stack, if CONFIG_MAGIC_SYSRQ=y, you can:

	$ echo 1 > /proc/sys/kernel/sysrq
	$ echo t > /proc/sysrq-trigger
	$ dmesg > /tmp/dmesg.out

Look in /tmp/dmesg.out for the process stack

Suka