[Stgt-devel] disk kicked out of RAID -> tgtd segmentation fault

[Tomasz Chmielewski]

FUJITA Tomonori schrieb:
> On Wed, 09 Jul 2008 08:03:05 +0200
> Tomasz Chmielewski <mangoo at wpkg.org> wrote:
> 
>> FUJITA Tomonori schrieb:
>>> On Mon, 30 Jun 2008 10:54:48 +0200
>>> Tomasz Chmielewski <mangoo at wpkg.org> wrote:
>>>
>>>> Tomasz Chmielewski schrieb:
>>>>> ronnie sahlberg schrieb:
>>>>>> Hi Tomasz,
>>>>>>
>>>>>> I could not get that configuration to work.
>>>>>>
>>>>>> Can you please provide more detailed instructions exactly how to set
>>>>>> up hosts A B and C
>>>>>> so I can try to reproduce it.
>>>>>>
>>>>>> Please provide the exact commandline for each and every command I need
>>>>>> to run on the three hosts and Ill try to
>>>>>> reproduce it under gdb.
>>>>> A faulty RAID is just one way to crash tgtd.
>>>>>
>>>>> A simpler one is to just block the traffic between the target and the 
>>>>> initiator - just login to the target, make sure there is some iSCSI 
>>>>> traffic between the target and the initiator, then block incoming iSCSI 
>>>>> traffic on the initiator with:
>>>>>
>>>>> initiator# iptables -I INPUT -s <target IP> -p tcp --sport 3260 -j DROP
>>>>>
>>>>>
>>>>> After a while, you will see that only one tgtd process is running, 
>>>>> whereas the second has crashed.
>>>> Note - the above seems to be valid if:
>>>>
>>>> - there are two initiators connected (from different IPs), perhaps more
>>>> - there is traffic from these two initiators
>>>> - we block traffic on one of these initiators
>>>>
>>>>
>>>> I couldn't reproduce the issue with only one initiator connected.
>>> Can you provide the detailed configuration?
>>>
>>> Do you mean:
>>>
>>> 1. there are three machines, say A, B, and C.
>> yes
>>
>>> 2. you run tgtd on A and setup one target in tgtd.
>> yes
>>
>>> 3. B and C work as an initiator. They connect to A. So the target on A
>>> has two sessions.
>> yes
>>
>>> Then you block the traffic btwwen A and B, then tgtd on A dies?
>>>
>>> Right?
>> Yes, exactly like that.
>> I'm not sure if blocking traffic in both ways is needed, or is it 
>> sufficient/needed to block the traffic from the initiator to the target 
>> (and not from target to the initiator, i.e., -I OUTPUT chain).
> 
> You block the traffic on the initiator and then on the target?

No, only on the initiator.


>>> I think that the output of tgtadm will enable us to understand your
>>> configuration easily.
>> What output?
> 
> As I said, the output of tgtadm shows what tgtd has:
> 
> Target 1: iqn.2001-04.org.osrg:viola
>     System information:
>         Driver: iscsi
>         State: ready

Aah, this output.

Nothing special there - two targets configured, each target has one 
initiator coming from a different IP.

I'll see if I gen get the output today.


-- 
Tomasz Chmielewski
http://wpkg.org