Consistent file system hang with RELENG_6 of today ...

[Marc G. Fournier]

And now, to follow up on my original ... I now have two core dumps, if 
anyone is interested :)

To give some details as to what I'm trying to do here, and how ...

I have a RELENG_6 machine, updated this afternoon, that I am trying to run 
a 4.x based jail environment on ... and these are what are live/running 
on my 6 productions 4.x machines right now ...

I have COMPAT_FREEBSD4 built into the kernel:

> strings /boot/kernel/kernel | grep -i COMPAT_ | grep __options
___options      COMPAT_43               #Compatible with BSD 4.3 [KEEP THIS!]
___options      COMPAT_FREEBSD4

Now, as most of the "old timers" here know, my jail environment makes use 
of unionfs to "mount" a template layer, to share common binaries amongst 
the VMs ...

I have tried two different ways of doing this, both result in the exact 
same 'file system hang' ... and I have a core of each 'method' ...

The first was to use mount_devfs to, of course, mount the /dev directory 
within the jail itself ...

The second, I used the same /dev that existed within the jail, based on 
bulding a jail using a 4.x system ...

In both cases, the hang appears to be at the same spot, where 'sendmail' 
(in this case, the postfix port) starts up ...

In both cases, I was able to enter DDB using CTL-ALT-ESC and create a 
dump, but, unlike a server crash, where you just basically bt the core 
file, I really haven't got a clue where to even start to provide 
information from the core's themselves ...

So, is there anyone out there able/willing to provide some direction on 
providing more information?

Thanks ...


On Thu, 28 Jul 2005, Marc G. Fournier wrote:

>
> 'k, I'm starting to play with 6.x, for our new server ... my priority right 
> now is to just have it run the existing 'jail' environments from my 4.x 
> machine, while I work on getting all of our servers up to 6.x, and then will 
> worry about the jail's themselves ...
>
> When I try and startup the 4.x jail on my 6.x machine, it "hangs" the file 
> system that the jail directory hierarchy happens to be mounted on though ... 
> twice in a row so far ...
>
> Now, I'm suspecting (and am going to try without it) that it might be because 
> I'm mounting devfs within the 4.x jail, but even then, it shouldn't hang 
> things up, only generate a whack of errors ...
>
> I have a good dump (CTL-ALT-ESC -> panic), but do not have a clue what to 
> offer from within there that might be of any use ...
>
> If anyone is interested ... ?
>
> thanks ...
>
> ----
> Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
> Email: scrappy at hub.org           Yahoo!: yscrappy              ICQ: 7615664
>

----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy at hub.org           Yahoo!: yscrappy              ICQ: 7615664