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--- linux:samba:troubleshooting [2012/01/16 21:43]
109.230.216.225 JSAjtgiZuFdpLbuUcra
+++ linux:samba:troubleshooting [2012/01/17 21:49] (current)
greebo old revision restored
@@ Line 1: / Line 1: @@
-Okay I'm cnovniecd. Let's put it to action.
+===== CIFS VFS No response for cmd n mid… =====
+<note>Taken from http://blog.dhampir.no/content/cifs-vfs-no-response-for-cmd-n-mid</note>
+<code>
+Aug 1 22:58:16 dreadnought kernel: CIFS VFS: No response to cmd 46 mid 25661
+Aug 1 22:58:16 dreadnought kernel: CIFS VFS: Send error in read = -11
+Aug 1 22:58:16 dreadnought kernel: CIFS VFS: No response for cmd 50 mid 25664
+Aug 1 22:58:16 dreadnought kernel: CIFS VFS: No response to cmd 47 mid 25663
+Aug 1 22:58:20 dreadnought kernel: CIFS VFS: No response to cmd 47 mid 25662
+Aug 1 22:58:20 dreadnought kernel: CIFS VFS: Write2 ret -11, written = 0
+Aug 1 22:58:20 dreadnought kernel: CIFS VFS: Send error in read = -9
+Aug 1 22:58:20 dreadnought kernel: CIFS VFS: Write2 ret -9, written = 0
+Aug 1 22:59:52 dreadnought kernel: CIFS VFS: No writable handles for inode
+Aug 1 23:00:29 dreadnought kernel: CIFS VFS: close with pending writes
+Aug 1 23:00:36 dreadnought kernel: CIFS VFS: close with pending writes
+Aug 1 23:01:16 dreadnought kernel: CIFS VFS: No writable handles for inode
+Aug 1 23:02:28 dreadnought kernel: CIFS VFS: close with pending writes
+Aug 1 23:03:23 dreadnought kernel: CIFS VFS: close with pending writes
+Aug 1 23:03:44 dreadnought kernel: CIFS VFS: close with pending writes
+Aug 1 23:05:35 dreadnought kernel: CIFS VFS: No writable handles for inode
+Aug 1 23:06:18 dreadnought kernel: CIFS VFS: close with pending writes
+Aug 1 23:06:35 dreadnought kernel: CIFS VFS: close with pending writes
+Aug 1 23:06:46 dreadnought kernel: CIFS VFS: No writable handles for inode
+Aug 1 23:06:46 dreadnought kernel: CIFS VFS: close with pending writes
+Aug 1 23:07:02 dreadnought kernel: CIFS VFS: close with pending writes
+Aug 1 23:07:46 dreadnought kernel: CIFS VFS: server not responding
+</code>
+I found a workaround which involves disabling Opportunistic Locking. This will have a small performance impact, but at least the thing wont hang up and use 100% CPU for no goddamn reason. Yes, this article has an angry tone, because this issue has eaten way too much of my time today. [[http://blog.dhampir.no/content/cifs-vfs-no-response-for-cmd-n-mid]]
+To disable Opportunistic Locking, you have to set the contents of the file “''**/proc/fs/cifs/OplockEnabled**''” to **0**. This file only exists after the cifs module has been loaded, and will be replaced if the module is unloaded and reloaded. Thus, I configured my /etc/rc.local script (use whatever equivalent your distro has to a startup script) to both load the cifs module and set the contents of said file:
+<code>
+# cifs client workaround
+modprobe cifs
+echo 0 > /proc/fs/cifs/OplockEnabled
+</code>