Re: [Nbd] nbd-server segfault on x86_64

["JaniD++" <djani22@...60...>]

----- Original Message ----- 
From: "Wouter Verhelst" <wouter@...3...>
To: "JaniD++" <djani22@...60...>
Cc: <nbd-general@lists.sourceforge.net>
Sent: Monday, February 13, 2006 5:43 PM
Subject: Re: [Nbd] nbd-server segfault on x86_64


> On Sat, Feb 11, 2006 at 07:27:51PM +0100, JaniD++ wrote:
> > Hello, list,
> >
> >
> > I found this:
> >
> > nbd-server[8737]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007fffffa02820 error 6
> > nbd-server[8771]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007fffffb06270 error 6
> > nbd-server[8796]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[8798]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[8804]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[8811]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[8815]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[8818]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[8877]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[8885]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd: registered device at major 43
> > nbd-server[8983]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[8990]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[8993]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[9032]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[9041]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[9058]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> > nbd-server[9062]: segfault at 0000000000000000 rip 000000000040322e rsp
> > 00007ffffffe85e0 error 6
> >
> > This happened when some client try to connect this server.
> > The server-thread process dies, every time.
> >
> > The system:
> > P4 Cual core(64 bit), Fedora Core 4 X86_64, Kernel 2.6.16-rc1-git4, nbd
> > 2.8.2, compiled on this system.
>
> I believe these problems have been fixed in 2.8.3, though I'm not
> entirely sure.  Could you try with 2.8.3? If that does not work, we'll
> need to debug a bit more.

Not needed.
It looks like fixed on 2.8.3.

>
> I can't check myself, since I don't have sufficient access to an
> AMD64/EM64T system myself.
>
> > And another one issue:
> >
> > My client machine is i386 system, and i get this, when i try to connect
to
> > 3.3TB blockdev:
> > "Exported device is too big for me. Get 64-bit machine :-("
> >
> > This is really need 64 bit machine?
> > This problem is cannot be solve with bit-shifting?
>
> Maybe, but that would require changes to the kernel driver.
>
> > This needs the >4GB memory access?
>
> No, it needs a useful unsigned long data type to be able to store
> offsets.
>
> I'm not 100% sure this check is still required, though. I'll try to find
> out.

Can i help to try / test?
(I have 4 nodes, all 3.3TB, but the NBD looks only 4x 2.0TB, and inside one
8TB XFS, with valuable data.
But the blockdevice is free from 8TB to 13.2TB.)

only note:
The NBD write-deadlock problem is finally fixed in kernel 2.6.16!
(thanks, to Herbert Xu, and me :-)

Thanks,
Janos


>
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