It did it again, this time with no kernel upgrade. Bzr diff hangs, and kill -9 doesn't stop it. Nfsd, rpciod, nfsiod, and kthreadd are running afterwards, and I don't see any system activity that could explain their activity. I moved to the server directory, and tried some bzr commands as follows: $ bzr diff bzr: ERROR: Could not acquire lock "/export/gpk/Documents/2010/predict_next/.bzr/checkout/dirstate": [Errno 11] Resource temporarily unavailable $ ps -e -f | grep bzr gpk 9578 9512 0 08:51 ? 00:00:00 /usr/bin/python /usr/bin/bzr-notify gpk 11416 9809 0 11:55 pts/1 00:00:00 /usr/bin/python /usr/bin/bzr diff gpk 19849 20672 0 11:58 pts/3 00:00:00 grep bzr $ kill 11416 $ kill -9 11416 $ ps -e -f | grep bzr gpk 9578 9512 0 08:51 ? 00:00:00 /usr/bin/python /usr/bin/bzr-notify gpk 11416 9809 0 11:55 pts/1 00:00:00 /usr/bin/python /usr/bin/bzr diff gpk 26240 20672 0 11:58 pts/3 00:00:00 grep bzr $ rm /export/gpk/Documents/2010/predict_next/.bzr/checkout/dirstate desk:predict_next$ bzr diff bzr: ERROR: invalid header line: '' $ So, breaking the lock simply reveals that the .bzr directory is in an inconsistent state. I attach the relevant bit of the output of mount: localhost:/gpk on /home/gpk/n type nfs4 (rw,intr,addr=127.0.0.1,clientaddr=127.0.0.1) and /etc/exports: /export 192.168.2.2(rw,fsid=0,root_squash,no_subtree_check,async) 127.0.0.1(rw,fsid=0,root_squash,no_subtree_check,async) 192.168.3.2(rw,fsid=0,root_squash,no_subtree_check,async) and the output of find .bzr -ls: $ find .bzr -ls 2150176 0 drwxrwxr-x 1 gpk gpk 108 Oct 21 10:35 .bzr 2150177 0 drwxrwxr-x 1 gpk gpk 0 Oct 21 10:35 .bzr/branch-lock 2150180 0 -rw-rw-r-- 1 gpk gpk 141 Oct 21 10:35 .bzr/README 2150181 0 -rw-rw-r-- 1 gpk gpk 35 Oct 21 10:35 .bzr/branch-format 2150182 0 drwxrwxr-x 1 gpk gpk 104 Oct 22 23:53 .bzr/repository 2150183 0 drwxrwxr-x 1 gpk gpk 0 Oct 22 23:53 .bzr/repository/lock 2150186 0 drwxrwxr-x 1 gpk gpk 1440 Oct 22 23:53 .bzr/repository/indices 2150223 0 -rw-rw-r-- 1 gpk gpk 165 Oct 21 10:36 .bzr/repository/indices/be4c431cb7cba2707a9aac1cfbde3a8f.rix 2150224 0 -rw-rw-r-- 1 gpk gpk 165 Oct 21 10:36 .bzr/repository/indices/be4c431cb7cba2707a9aac1cfbde3a8f.iix 2150225 0 -rw-rw-r-- 1 gpk gpk 226 Oct 21 10:36 .bzr/repository/indices/be4c431cb7cba2707a9aac1cfbde3a8f.tix 2150226 0 -rw-rw-r-- 1 gpk gpk 72 Oct 21 10:36 .bzr/repository/indices/be4c431cb7cba2707a9aac1cfbde3a8f.six 2150227 0 -rw-rw-r-- 1 gpk gpk 184 Oct 21 10:36 .bzr/repository/indices/be4c431cb7cba2707a9aac1cfbde3a8f.cix 2150312 0 -rw-rw-r-- 1 gpk gpk 188 Oct 21 12:46 .bzr/repository/indices/7a8be53033f27ce13033053c17275f63.rix 2150313 0 -rw-rw-r-- 1 gpk gpk 187 Oct 21 12:46 .bzr/repository/indices/7a8be53033f27ce13033053c17275f63.iix 2150314 0 -rw-rw-r-- 1 gpk gpk 216 Oct 21 12:46 .bzr/repository/indices/7a8be53033f27ce13033053c17275f63.tix 2150315 0 -rw-rw-r-- 1 gpk gpk 72 Oct 21 12:46 .bzr/repository/indices/7a8be53033f27ce13033053c17275f63.six 2150316 0 -rw-rw-r-- 1 gpk gpk 150 Oct 21 12:46 .bzr/repository/indices/7a8be53033f27ce13033053c17275f63.cix 2152677 0 -rw-rw-r-- 1 gpk gpk 227 Oct 22 21:00 .bzr/repository/indices/f3ecd8d5773da7439df1d8437833ca8e.rix 2152678 0 -rw-rw-r-- 1 gpk gpk 227 Oct 22 21:00 .bzr/repository/indices/f3ecd8d5773da7439df1d8437833ca8e.iix 2152679 0 -rw-rw-r-- 1 gpk gpk 224 Oct 22 21:00 .bzr/repository/indices/f3ecd8d5773da7439df1d8437833ca8e.tix 2152680 0 -rw-rw-r-- 1 gpk gpk 72 Oct 22 21:00 .bzr/repository/indices/f3ecd8d5773da7439df1d8437833ca8e.six 2152681 0 -rw-rw-r-- 1 gpk gpk 148 Oct 22 21:00 .bzr/repository/indices/f3ecd8d5773da7439df1d8437833ca8e.cix 2153539 0 -rw-rw-r-- 1 gpk gpk 183 Oct 22 23:53 .bzr/repository/indices/3b2ecd3633cfda9bd3ae8146481686f0.rix 2153540 0 -rw-rw-r-- 1 gpk gpk 180 Oct 22 23:53 .bzr/repository/indices/3b2ecd3633cfda9bd3ae8146481686f0.iix 2153541 0 -rw-rw-r-- 1 gpk gpk 212 Oct 22 23:53 .bzr/repository/indices/3b2ecd3633cfda9bd3ae8146481686f0.tix 2153542 0 -rw-rw-r-- 1 gpk gpk 72 Oct 22 23:53 .bzr/repository/indices/3b2ecd3633cfda9bd3ae8146481686f0.six 2153543 0 -rw-rw-r-- 1 gpk gpk 150 Oct 22 23:53 .bzr/repository/indices/3b2ecd3633cfda9bd3ae8146481686f0.cix 2150187 0 drwxrwxr-x 1 gpk gpk 0 Oct 21 10:35 .bzr/repository/obsolete_packs 2150188 0 drwxrwxr-x 1 gpk gpk 296 Oct 22 23:53 .bzr/repository/packs 2150222 2 -rw-rw-r-- 1 gpk gpk 2358 Oct 21 10:36 .bzr/repository/packs/be4c431cb7cba2707a9aac1cfbde3a8f.pack 2150311 3 -rw-rw-r-- 1 gpk gpk 2720 Oct 21 12:46 .bzr/repository/packs/7a8be53033f27ce13033053c17275f63.pack 2152676 3 -rw-rw-r-- 1 gpk gpk 3418 Oct 22 21:00 .bzr/repository/packs/f3ecd8d5773da7439df1d8437833ca8e.pack 2153538 3 -rw-rw-r-- 1 gpk gpk 3514 Oct 22 23:53 .bzr/repository/packs/3b2ecd3633cfda9bd3ae8146481686f0.pack 2150189 0 drwxrwxr-x 1 gpk gpk 0 Oct 22 23:53 .bzr/repository/upload 2150191 0 -rw-rw-r-- 1 gpk gpk 54 Oct 21 10:35 .bzr/repository/format 2153546 0 -rw-rw-r-- 1 gpk gpk 227 Oct 22 23:53 .bzr/repository/pack-names 2150192 0 drwxrwxr-x 1 gpk gpk 76 Oct 22 23:53 .bzr/branch 2150193 0 drwxrwxr-x 1 gpk gpk 0 Oct 22 23:53 .bzr/branch/lock 2150198 0 -rw-rw-r-- 1 gpk gpk 0 Oct 21 10:35 .bzr/branch/tags 2150199 0 -rw-rw-r-- 1 gpk gpk 39 Oct 21 10:35 .bzr/branch/format 2152671 0 -rw-rw-r-- 1 gpk gpk 250 Oct 22 21:00 .bzr/branch/branch.conf 2153547 0 -rw-rw-r-- 1 gpk gpk 52 Oct 22 23:53 .bzr/branch/last-revision 2150200 0 drwxrwxr-x 1 gpk gpk 88 Oct 23 11:59 .bzr/checkout 2150201 0 drwxrwxr-x 1 gpk gpk 0 Oct 22 23:53 .bzr/checkout/lock 2150204 0 -rw-rw-r-- 1 gpk gpk 40 Oct 21 10:35 .bzr/checkout/format 2150206 0 -rw-rw-r-- 1 gpk gpk 0 Oct 21 10:35 .bzr/checkout/views 2152688 0 -rw-rw-r-- 1 gpk gpk 33 Oct 22 21:00 .bzr/checkout/merge-hashes 2152689 0 -rw-rw-r-- 1 gpk gpk 27 Oct 22 21:00 .bzr/checkout/conflicts 2154324 0 -rw-rw-r-- 1 gpk gpk 0 Oct 23 11:59 .bzr/checkout/dirstate