Graveman up to 0.3.12_p4 invokes mkisofs with -J (joliet) but without -joliet-long, making it fail to sort the joliet tree when 2 or more files have the same first 64 characters in their file name, during creation of a data cd or dvd. mkisofs fails with "joliet tree sort failed" and graveman aborts with an uninformative "Input/output error". That's an upstream bug fixed in svn. I backported the fix which should be applied to our current version, otherwise it should be marked unstable.
Created attachment 63107 [details] fix to no -joliet-long bug for graveman-0.3.12_p4
Patch included in 0.3.12_p4-r1. Thanks Federico!