NT Crashes when doing large network file Xfers (was Re: NT crashes during smbtar)

Rick Flower Rick.Flower at trw.com
Tue Jun 30 15:53:02 GMT 1998

Ok.. Just for the record, I STAND CORRECTED!  The problem does
appear to be NT.. The thing that irritated me was that nobody was
interested in giving any backup data!  Everyone just wanted to blindly
admit that it must be NT. Ok.. Enuf bitching.. On to the better stuff...

Anyway, David Mansfield and I are trying to narrow down the machine
configurations where this happens.. Currently, we've found that even
without a Samba server in the picture that NT's networking subsystem
will crash (leaving the rest of the OS working fine) when copying large
files (around 40mb) from one NT box to another.. This leads me to
wonder why this information isn't commonly known (ie. it isn't in the NT
FAQ, etc).  Has anyone reported this BUG to Microsloth?  Are there
any known workarounds?  Could it be a bug in the NIC if the only NICs
effected are 3com cards?  Currently our failure machines are running
3com 3c595's in 100mb mode.

So, if you see the NT network subsystem go DOA on you, can you tell
us what network card you are running along with other vital stats (ie.
10mb / 100mb mode, full/half duplex, make/model of NIC, NT version,
is the local subnet router in full or half duplex, etc.).


-- Rick

P.S. I've CC'd this message over to the Amanda mailing-list just for
       those other users that may not be aware of this conversation..
       Please post any followups on the samba mailing list if possible.
-----Original Message-----
From: David Mansfield <david at cobite.com>
To: Multiple recipients of list <samba at samba.anu.edu.au>
Date: Monday, June 29, 1998 3:03 PM
Subject: Re: NT crashes during smbtar

>On Mon, 29 Jun 1998, Rick Flower wrote:
>> David,
>> You are not the only one that sees this problem.. I posted another
>> about this approx. 1 month ago (or less).  We see it here frequently
>> Samba in conjunction with Amanda.  All of our machines are NT 4.0 with
>> (or in some cases SP2).  Everything you say it true -- no networking
>> I've talked to one other individual that saw this problem.  I suspect
>> if and
>> when more people start seeing this problem, then and only then will it
>> addressed...  For now, nobody appears to be too interested in finding out
>> WHY it happens..  Like I wrote in my last message, I had some idiot reply
>> to my initial message saying that it must be NT's fault!  Yeah right!
>> -- Rick
>> -----Original Message-----
>> From: David Mansfield <david at cobite.com>
>> To: Multiple recipients of list <samba at samba.anu.edu.au>
>> Date: Thursday, June 25, 1998 9:37 PM
>> Subject: NT crashes during smbtar
>> >I have been regularly crashing my NT boxen trying to back them up via an
>> >smbtar (smbclient).  The crash is not complete - the network layer on NT
>> >goes away.  You can still operate the console, but no net traffic.  This
>> >is NT workstation and server 4.0 with sp3.  The UNIX samba server is
>> >Solaris 2.5 with the latest samba version (1.9.18p8?) also with other
>> >samba versions.
>> >
>> >I tried updating the NT tcpip stack with the teardrop fix (hoping that
>> >someone would have found this little bug) but no go.  The machine has a
>> >3c595 NIC in case that matters.
>> >
>> >I don't THINK the machine crashes except when being accessed like this
>> >smbclient, although it did crash once when copying from this machine to
>> >samba server via a third party nt workstation (does this copy go through
>> >the intermediate machine or is it smart enough to copy direct?)
>> >
>> >Any clues?
>> >
>> >Please cc direct to me in case I miss responses in the digest.
>> >Thanks.
>> >
>> >*==============================*
>> >| David Mansfield              |
>> >| david at cobite.com             |
>> >|                              |
>> >| (212) 536-9115               |
>> >*==============================*
>> >
>> >
>| David Mansfield              |
>| david at cobite.com             |
>|                              |
>| (212) 536-9115               |

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