id summary reporter owner description type status priority milestone component version resolution keywords cc launchpad_bug 698 corrupted file displayed to user after failure to download followed by retry zooko "I clicked the bookmark to load my blog writably, and I got an HTML page saying: {{{ : FirstError(>, 2) : FirstError(>, 2) }}} I looked at the ""Recent Uploads/Downloads"" page and saw that my attempt to load it had failed: {{{ 09:23:12 07-May-2009 download lxershd2xflho66w6yikhwg3ne No 588.7kB 0.0% Failed 09:23:12 07-May-2009 retrieve 6s64wyhfbm7yxb5cwzqblnndpe No 2.0kB 100.0% Done 09:23:12 07-May-2009 mapupdate MODE_READ 6s64wyhfbm7yxb5cwzqblnndpe No -NA- 100.0% Done }}} The three details pages are attached: {{{mapupdate-35.html}}}, {{{retrieve-35.html}}}, and {{{down-13.html}}}. I looked in the {{{logs}}} directory of my Tahoe node, and saw that the {{{twistd.log}}} had these same error messages about {{{DeadReferenceError}}}. {{{twistd.log}}} is attached (bzipped). I looked in the {{{logs/incidents}}} directory and saw that there was one incident that was recorded at the time of this attempt to load. It is attached as {{{incident-2009-05-07-094319-jg54cni.flog.bz2}}}. The triggering incident line is {{{ 13:51:05.704 [6928]: SCARY (hekksgbfsn6w): download failed! FAILURE: [CopiedFailure instance: Traceback from remote host -- Traceback (most recent call last): Failure: twisted.internet.defer.FirstError: FirstError(>, 0) ] }}} So far I think that this Tahoe demonstrating suboptimal handling of a network failure -- it should probably have returned an HTTP 503 ""Service Unavailable"" (or maybe 504 ""Gateway Timeout"" or just 500 ""Internal Server Error""?) instead of an HTML page containing cryptic error messages. But it gets worse: Then I hit the ""Reload"" button on my web browser, and I got the same two error message lines followed by a partial copy of the contents of my blog source code! This result is attached as {{{wiki.html}}} (bzipped). This is what I mean by a corrupted file being displayed to the user. The ""Recent Uploads and Downloads"" now says: {{{ 09:47:10 07-May-2009 retrieve 6s64wyhfbm7yxb5cwzqblnndpe No 2.0kB 100.0% Done 09:47:10 07-May-2009 mapupdate MODE_READ 6s64wyhfbm7yxb5cwzqblnndpe No -NA- 100.0% Done 09:23:12 07-May-2009 download lxershd2xflho66w6yikhwg3ne No 588.7kB 0.0% Failed 09:23:12 07-May-2009 retrieve 6s64wyhfbm7yxb5cwzqblnndpe No 2.0kB 100.0% Done 09:23:12 07-May-2009 mapupdate MODE_READ 6s64wyhfbm7yxb5cwzqblnndpe No -NA- 100.0% Done }}} The fact that there is no download following the map-update is surprising to me. The details from the new {{{mapupdate-36.html}}} and {{{retrieve-36.html}}} are attached. There are no new problems reported in the {{{twistd.log}}} or the {{{logs/incidents/}}}. I'm going to go ahead and mark this with {{{Priority: critical}}} because I see a corrupted file and I don't understand why. Hopefully it will turn out to be a bug in the web browser, which is an unstable release: firefox-3.5 {{{3.5~b4~hg20090330r24021+nobinonly-0ubuntu1}}}." defect closed critical 1.5.0 code-network 1.4.1 invalid integrity