Please don't reply to lustre-devel. Instead, comment in Bugzilla by using the 
following link:
https://bugzilla.lustre.org/show_bug.cgi?id=11416

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW


Below are some more sample messages..I'll keep digging, but I do not see the
"### lock callback timer expired".  The nodes mount 2 lustre file systems one of
which had issues last week (errors are not coming from the problem fs).  I'm
considering stopping/starting lustre (umount,lconf -d and mount) to see what
happens.

server:

Dec 18 15:22:59 ca894 kernel: LustreError:
7428:0:(ldlm_lockd.c:1043:ldlm_handle_cancel()) received cancel for unknown lock
cookie 0xe39bddcbdac8c2db from client c05a5639-d38f-0400-cfbf-834a787a5e1e id
[EMAIL PROTECTED]
Dec 18 15:22:59 ca894 kernel: LustreError:
7428:0:(ldlm_lockd.c:1043:ldlm_handle_cancel()) Skipped 9 previous similar 
messages
Dec 18 15:25:49 ca894 kernel: LustreError:
7446:0:(ldlm_lockd.c:1043:ldlm_handle_cancel()) received cancel for unknown lock
cookie 0xe39bddcbdac8c22c from client c05a5639-d38f-0400-cfbf-834a787a5e1e id
[EMAIL PROTECTED]
Dec 18 15:25:49 ca894 kernel: LustreError:
7446:0:(ldlm_lockd.c:1043:ldlm_handle_cancel()) Skipped 1 previous similar 
message

client:
Dec 18 15:22:59 eu352 kernel: LustreError:
24052:0:(file.c:747:ll_extent_lock_callback()) Skipped 3 previous similar 
messages
Dec 18 15:23:05 eu352 kernel: LustreError:
24071:0:(ldlm_request.c:746:ldlm_cli_cancel()) client/server (nid
[EMAIL PROTECTED]) out of sync -- not fatal, flags 1056912
Dec 18 15:23:05 eu352 kernel: LustreError:
24071:0:(ldlm_request.c:746:ldlm_cli_cancel()) Skipped 3 previous similar 
messages
Dec 18 15:23:05 eu352 kernel: LustreError:
24071:0:(file.c:747:ll_extent_lock_callback()) ldlm_cli_cancel failed: 116
Dec 18 15:23:05 eu352 kernel: LustreError:
24071:0:(file.c:747:ll_extent_lock_callback()) Skipped 3 previous similar 
messages
Dec 18 15:23:12 eu352 kernel: LustreError:
24069:0:(ldlm_request.c:746:ldlm_cli_cancel()) client/server (nid
[EMAIL PROTECTED]) out of sync -- not fatal, flags 1056912

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