[ENBD] nbd 2.4.27 recommended kernel

[Peter T. Breuer]

Let me more specific about my debugging instructions to you ...

"A month of sundays ago Peter T. Breuer wrote:"
> "A month of sundays ago Cicero Mota wrote:"
> > Here is what I did, hope you can give some help
> > dd if=/dev/zero of=/tmp/delme bs=1024 count=5000000
> > nbd-server  2610: server (0) set new signal handlers for slave server 2610
> > nbd-server  2610: newproto net errored on packet. Breaking off.
> 
> Except here we get a basic communication problem.
> > nbd-client  2609: client (0) begins main loop
> 
> Well, the other end wan't that happy with it. Doesn't it die?
> 
> But what does /proc/nbdinfo say? It's pointless proceding until the
> device has been set up.

> > dereference at virtual address 00000a33
> 
> 0 plus 2600 or so. I don't have any structure that big.
> 
> > Mar 12 19:41:34 fourier kernel:  printing eip:
> > Mar 12 19:41:34 fourier kernel: c0114528
> > Mar 12 19:41:34 fourier kernel: *pde = 00000000
> > Mar 12 19:41:34 fourier kernel: Oops: 0002
> > Mar 12 19:41:34 fourier kernel: CPU:    0
> > Mar 12 19:41:34 fourier kernel: EIP:    
> > 0010:[interruptible_sleep_on_timeout+44/104]


OK


1) run "make test" from the package. Do not do your own setup.
2) if the test device sets itself up properly, (on /dev/nda? I
   don't recall), run

     nbd-test /dev/nda -t 1:2

3) if the above segfaults, redo the test after having recompiled the
   module with DEBUG=1 (or 2, or 3) as a parameter. I.e.

     rm /tmp/nbd.o
     make DEBUG=1

   and replace the loaded module with the new one. Oh yes, sorry, but
   you have to reboot after a kernel oops. Maybe things are OK, maybe
   they aren't .. I need to know they are OK.

   Run the test again. There should be a lot of debugging info in
   dmesg. If that's not enough to pinpoint the segfault, do it again
   with a higher DEBUG number. Start with "1", though. Too much
   information is as difficult to deal with as too little.

When I have news back from you we can go on to chase it down some
more.

Peter