bigcouch: Uncaught error in HTTP request: {exit, normal}

scanning through bigcouch.log shows similar errors on dev.bm + bm:

dsh -cM -g bm.couch -g dev.bm.couch -g unstable.bm.couch -g cdev.bm.couch "/srv/leap/couchdb/scripts/tests/check_bigcouch_errors.sh" 
elk: 1 Bigcouch_Log errors=5 Warning: 5 errors in total in /opt/bigcouch/var/log/bigcouch.log. 5 occurrences of "Uncaught error in HTTP request: {exit,".
urchin: 2 Bigcouch_Log errors=8 Critical: 8 errors in total in /opt/bigcouch/var/log/bigcouch.log. 8 occurrences of "Uncaught error in HTTP request: {exit,".
clam: 2 Bigcouch_Log errors=11 Critical: 11 errors in total in /opt/bigcouch/var/log/bigcouch.log. 11 occurrences of "Uncaught error in HTTP request: {exit,".
panda: 0 Bigcouch_Log errors=0 OK: 0 errors in total in /opt/bigcouch/var/log/bigcouch.log.
gadwall: 0 Bigcouch_Log errors=0 OK: 0 errors in total in /opt/bigcouch/var/log/bigcouch.log.
thrips: 1 Bigcouch_Log errors=3 Warning: 3 errors in total in /opt/bigcouch/var/log/bigcouch.log. 3 occurrences of "Uncaught error in HTTP request: {exit,".
ant: 2 Bigcouch_Log errors=6 Critical: 6 errors in total in /opt/bigcouch/var/log/bigcouch.log. 6 occurrences of "Uncaught error in HTTP request: {exit,".

i paste one example of this from clam (dev.bm):

[Fri, 28 Feb 2014 20:18:29 GMT] [error] [<0.22162.711>] [be71db8a] Uncaught error in HTTP request: {exit,
                                                                    normal}
[Fri, 28 Feb 2014 20:18:29 GMT] [info] [<0.22162.711>] [be71db8a] Stacktrace: [{mochiweb_request,send,2,
                                                [{file,
                                                  "src/mochiweb_request.erl"},
                                                 {line,146}]},
                                               {mochiweb_request,respond,2,
                                                [{file,
                                                  "src/mochiweb_request.erl"},
                                                 {line,330}]},
                                               {couch_httpd,send_response,4,
                                                [{file,"src/couch_httpd.erl"},
                                                 {line,618}]},
                                               {chttpd,handle_request,1,
                                                [{file,"src/chttpd.erl"},
                                                 {line,198}]},
                                               {mochiweb_http,headers,5,
                                                [{file,
                                                  "src/mochiweb_http.erl"},
                                                 {line,126}]},
                                               {proc_lib,init_p_do_apply,3,
                                                [{file,"proc_lib.erl"},
                                                 {line,227}]}]
[Fri, 28 Feb 2014 20:18:29 GMT] [info] [<0.22162.711>] [be71db8a] undefined - - 'GET' / 500

i can't find anything related in any logs that could have caused this.

drebs, do you know what could be that causes bigcouch to throw this error ? but i don't see any relation to

(from redmine: created on 2014-02-28, closed on 2014-03-04, relates #5005 (closed), relates #6901 (closed))