Bug 435316

Description of problem:

A copy from or to a samba share frequently fails with error:
"The specified network name is no longer available"

Filesize is correct, but is corrupt (ends in several megabyte ascii-nul).

Around the same time the event log in the Windows machine says:
NetBT Event ID 4322:
NetBT could not process a request, because at least one
OutOfResources-Exception occurred in the last hour".

Network tracing showed it is the Windows PC that sends a TCP RST
packet to the server, breaking the connection.

Version-Release number of selected component (if applicable):
samba-3.0.25b-1.el5_1.4


How reproducible:

We can only reproduce it on our faster servers (Xeon dual core) with 
gigabit ethernet, and older PC clients (WinXP, 4 years old),
which are connected with 100mbit.

The error has more chance of occurring when you copy some other small
files into the same directory while a large file copy is busy.

The error has *less* chance of occurring when modifying the socket
options in smb.conf, and settings the socket buffers to 8K or 4K.
(I believe the default buffersize is 65K?).


Steps to Reproduce:
1.  Copy a large file to the share (e.g. 10 mB).
2.  
3.
  
Actual results:

Error msg on Windows PC. Samba logs contains an error
followed by a reconnect from the client PC to the share:

[2008/02/28 10:02:03, 0] lib/util_sock.c:read_data(534)
  read_data: read failure for 4 bytes to client 10.32.1.143. Error = Connection
reset by peer
[2008/02/28 10:02:04, 0] lib/util_sock.c:write_data(562)
  write_data: write failure in writing to client 10.32.1.143. Error Broken pipe
[2008/02/28 10:02:04, 0] lib/util_sock.c:send_smb(769)
  Error writing 75 bytes to client. -1. (Broken pipe)
[2008/02/28 10:02:04, 0] lib/util_sock.c:write_data(562)
  write_data: write failure in writing to client 10.32.1.143. Error Connection
reset by peer
[2008/02/28 10:02:04, 0] lib/util_sock.c:send_smb(769)
  Error writing 4 bytes to client. -1. (Connection reset by peer)
[2008/02/28 10:02:10, 1] smbd/service.c:make_connection_snum(1033)
  ajaccio (10.32.1.143) connect to service xls initially as user sophiep
(uid=1163, gid=10) (pid 10900)


Expected results:


Additional info:

In a test setup I applied the patch found at:
https://bugzilla.samba.org/show_bug.cgi?id=4763
and I could not reproduce the error anymore.  
That patch probably can fix it.