In rare cases CRC codes dont match when reading data from couch file

I experimented with building index on 6 cluster_run nodes and 9E6 simple docs. Everything went fine and results appeared right, but I'm seeing

[ns_server:debug,2012-09-05T21:31:14.218,n_5@10.17.21.241:compaction_daemon:compaction_daemon:schedule_next_compaction:1204]Finished compaction too soon. Next run will be in 30s
[couchdb:error,2012-09-05T21:31:14.296,n_2@10.17.21.241:<0.9681.0>:couch_log:error:42]Set view `default`, replica group `_design/dev_t`, doc loader error
error:

{file_corruption,<<"file corruption">>}

stacktrace: [

{couch_file,pread_iolist,2}

,

{couch_db,open_doc_int,3}

,

{couch_set_view_updater,load_doc,4}

,

{couch_set_view_updater,'-load_changes/7-fun-0-',6}

,

{couch_btree,stream_kv_node2,8}

,

{couch_btree,stream_kp_node,7}

,

{couch_btree,fold,4}

,

{couch_db,enum_docs_since,5}

]

[couchdb:error,2012-09-05T21:31:14.297,n_2@10.17.21.241:<0.6715.0>:couch_log:error:42]Set view `default`, replica group `_design/dev_t`, received error from updater:

{file_corruption, <<"file corruption">>}

[couchdb:info,2012-09-05T21:31:17.856,n_2@10.17.21.241:<0.6715.0>:couch_log:info:39]Starting updater for set view `default`, replica group `_design/dev_t`
[couchdb:info,2012-09-05T21:31:17.856,n_2@10.17.21.241:<0.9753.0>:couch_log:info:39]Updater for set view `default`, replica group `_design/dev_t` started

in logs. Will attach logs from this box.