Using read-only NULLFS leads to panic. gdb output included,easy toreproduce.

[James Read]

Quickly forgot to mention this occured on 4.9 RELEASE and also when I
upgraded to 4.9-STABLE #0: Sun Feb 15.

Kernel is GENERIC with just IPFW + DUMMYNET added in.

Regards,

James.




----- Original Message ----- 
From: "James Read" <james at physicalsegment.com>
To: "Pawe³ Ma³achowski" <pawmal-posting at freebsd.lublin.pl>
Cc: <stable at freebsd.org>
Sent: Wednesday, March 03, 2004 10:48 PM
Subject: Re: Using read-only NULLFS leads to panic. gdb output included,easy
toreproduce.


> > find /usr/ports -type f -perm -u+s &
> > find /usr/ports -type f -perm -u+s &
> > ...
> > find /mnt/1 -type f -perm -u+s &
> > find /mnt/1 -type f -perm -u+s &
> > ...
> > find /mnt/2 -type f -perm -u+s &
> > find /mnt/2 -type f -perm -u+s &
> > ...
> >
> > (Machine C crashed after few minutes).
>
>
> All I can say is that I've had this happen to me before. 'Me too'
>
> The ports were mounted in exact the same way, but with rw instead of ro.
>
> Also a few jails were running at the time, infact 3 were. All had
/usr/ports
> mount_null'ed inside there jail.
>
> After running find from the usual periodic scripts it brought the machine
> down every time it ran that script.
>
> What I did to stop the box from panicing all the time at that one
particular
> place, was just to disable the script that does the 'find' / locate. Off
the
> top of my head I think it was /etc/periodic/weekly/310.locate. Once this
was
> disabled (from inside and outside the jails), I didnt get any more panics
> from 'find'.
>
> Granted this isnt a fix, but it did save me from panic hell every week.
>
> If there is a better way / another way to 'mount_null' /usr/ports (or any
> other mount point for that matter) to other places in/on the filesystem,
by
> using NFS or other such things, then speak up! I don't like getting panics
> more then anyone else does ;>
>
> Regards,
>
> James.
>
>
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