This bug is missing log files that will aid in diagnosing the problem.
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apport-collect 1602827

and then change the status of the bug to 'Confirmed'.

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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1602827

Title:
  NFS server "shutting down socket" during large file copies Ubunutu
  14.04.4 LTS

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This is very similar to bug 585657: 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/585657
  Difference is my server doesn't freeze, it closes the socket. System 
integrity is still responsive.

  I'm running NFS version 4 on Ubuntu 14.04.4 LTS and during large rsync
  file copies (200MB+) they die midway. This is killing my zimbra email
  backups :(. I haven't had the system freeze during this scenario but
  what ends up happening is the copy fails on the client side and then
  my NFS server shuts the socket down due to excessive failures. Smaller
  file copies work perfectly fine.

  Here are the client/server logs.

  #Client
  Jul  9 01:00:39 mailserv01 kernel: [591473.216168] nfs: server NFS-Backup01 
not responding, still trying
  Jul  9 01:00:39 mailserv01 kernel: [591473.216174] nfs: server NFS-Backup01 
not responding, still trying
  Jul  9 01:00:39 mailserv01 kernel: [591473.218841] nfs: server NFS-Backup01 OK
  Jul  9 01:00:39 mailserv01 kernel: [591473.219159] nfs: server NFS-Backup01 OK
  Jul  9 01:01:14 mailserv01 kernel: [591508.710863] nfs: server NFS-Backup01 
not responding, still trying
  Jul  9 01:08:16 mailserv01 kernel: [591929.870358] nfs: server NFS-Backup01 OK
  Jul  9 01:08:44 mailserv01 kernel: [591958.514953] nfs: server NFS-Backup01 
not responding, still trying
  Jul  9 01:10:23 mailserv01 kernel: [592056.840273] nfs: server NFS-Backup01 OK
  Jul  9 01:11:19 mailserv01 kernel: [592113.298900] nfs: server NFS-Backup01 
not responding, still trying
  Jul  9 01:13:07 mailserv01 kernel: [592221.275966] nfs: server NFS-Backup01 OK
  Jul  9 01:15:22 mailserv01 kernel: [592355.580401] nfs: server NFS-Backup01 
not responding, still trying
  Jul  9 01:15:22 mailserv01 kernel: [592355.615649] nfs: server NFS-Backup01 OK
  Jul  9 01:16:03 mailserv01 kernel: [592397.459848] nfs: server NFS-Backup01 
not responding, still trying
  Jul  9 01:16:08 mailserv01 kernel: [592401.663381] nfs: server NFS-Backup01 OK
  Jul  9 01:17:06 mailserv01 kernel: [592460.381059] nfs: server NFS-Backup01 
not responding, still trying

  #NFS Server
  Jul  9 01:01:51 NFS-Backup01 kernel: [130980.762798] RPC request reserved 156 
but used 176
  Jul  9 01:08:28 NFS-Backup01 kernel: [131377.839675] RPC request reserved 156 
but used 176
  Jul  9 01:08:46 NFS-Backup01 kernel: [131395.943517] rpc-srv/tcp: nfsd: got 
error -32 when sending 136 bytes - shutting down socket
  Jul  9 01:10:17 NFS-Backup01 kernel: [131486.962508] RPC request reserved 156 
but used 176
  Jul  9 01:10:22 NFS-Backup01 kernel: [131492.447565] RPC request reserved 156 
but used 176
  Jul  9 01:10:27 NFS-Backup01 kernel: [131496.837561] rpc-srv/tcp: nfsd: got 
error -32 when sending 136 bytes - shutting down socket
  Jul  9 01:10:54 NFS-Backup01 kernel: [131524.423501] RPC request reserved 156 
but used 176
  Jul  9 01:15:31 NFS-Backup01 kernel: [131801.603553] rpc-srv/tcp: nfsd: got 
error -32 when sending 136 bytes - shutting down socket
  Jul  9 01:16:55 NFS-Backup01 kernel: [131885.232973] rpc-srv/tcp: nfsd: got 
error -32 when sending 136 bytes - shutting down socket

  #Client fstab
  NFS-Backup01:/mnt/backup /mnt/backup nfs 
rsize=8192,wsize=8192,nfsvers=4,hard,timeo=14,intr

  #NFS Server fstab
  /mnt/backup    /mnt/backup  none    bind  0  0

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