[Bug 578866] Re: NFS4 kills system (no reboot possible)

[H.-Dirk Schmitt]

** Tags added: apport-collected

** Description changed:

  I have migrated from a NFS3 infrastructure to NFS4 (without kerberos)
  (to workaround  #525154)
  
  Setup:
  * ubuntu/lucid amd64
     autofs5/lucid uptodate 5.0.4-3.1ubuntu5
     linux-image-generic/lucid uptodate 2.6.32.22.23 [because I have got troubles to boot the system with a -server kernel (since lucid) I'm using currently the -generic kernel]
     nfs-kernel-server/lucid uptodate 1:1.2.0-4ubuntu4
  * create /srv/nfs4 and export it via NFS4
  * have bind mounts from /srv/nfs4 to the traditional mount points of the exported shares
  
  With NFS4 I can't use bind mount with autofs (out of the box).
  So I have to access "shared" drives locally also with NFS4.
  
  If I copy a big file (e.g. a CD image) to a share mounted via NFS4 locally after short time the system is blocked.
  * LoadAvg grows to infinity 
  * After some time I see messages about blocked task correlated to nfs or accessing nfs shares on the local sever and all clients accessing this server
  * shutdown/reboot will also blocked and not come to an end
    To reboot the system I have to issue a hard reboot on the server console
  
  The problem doesn't occur if I:
  * copy only smaller files
  * copy files from client to the server (e.g. a 160GB hdd image was processed without error)
  
  The problem occurs on both nfs servers.
  
  Hardware:
  2 similar boxes with:
  * TYAN Thunder  K8WE S2895
  * 2 Opteron K8 CPUs
  * SCSI and SATA hdds
  
  
  [As a workaround I will create diverted autofs configuration with explicit local binding mounts.]
+ --- 
+ Architecture: amd64
+ DistroRelease: Ubuntu 10.04
+ Package: linux (not installed)
+ ProcEnviron:
+  LANGUAGE=de_DE:de:en_US:en
+  PATH=(custom, no user)
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
+  LC_PAPER=de_DE.UTF-8
+ ProcVersionSignature: Ubuntu 2.6.32-24.39-server 2.6.32.15+drm33.5
+ Regression: Yes
+ Reproducible: Yes
+ Tags: lucid  regression-release needs-upstream-testing
+ Uname: Linux 2.6.32-24-server x86_64
+ UserGroups:

-- 
NFS4 kills system (no reboot possible)
https://bugs.launchpad.net/bugs/578866
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