Some NFS file transfers fail and hang automounting
From Linux NFS
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About
- Kernel version: 2.6.33.5-112.fc13.x86_64
- Bug 126213
- Reported by: Philippe Dax (June 15, 2010)
- Fixed by: Trond Myklebust (June 16, 2010)
Symptoms
- Given a file "foo" of 50Mb on a remote machine "remote".
- This command will never finish
<localmachine $> cp /remote_mount_point/foo bar
- bar will have a size less than foo.
- automounting of the local machine is hung.
- This command will never finish
- The following message will show up in /var/log/messages
kernel: Callback slot table overflowed
- The problem doesn't occur if foo has a size less than 10Mb
- The final size of bar appears to be random
- This incident occurs with:
sunrpc.tcp_slot_table_entries = 16
- This incident does NOT occur with:
sunrpc.tcp_slot_table_entries = 32
Cause
Resolution
This problem was fixed by:
commit b76ce56192bcf618013fb9aecd83488cffd645cc Author: Trond Myklebust <Trond.Myklebust@netapp.com> Date: Wed Jun 16 13:57:32 2010 -0400 SUNRPC: Fix a re-entrancy bug in xs_tcp_read_calldir() If the attempt to read the calldir fails, then instead of storing the read bytes, we currently discard them. This leads to a garbage final result when upon re-entry to the same routine, we read the remaining bytes. Fixes the regression in bugzilla number 16213. Please see https://bugzilla.kernel.org/show_bug.cgi?id=16213 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@kernel.org