The message generated for web commits:
web commit by mädduck
is not utf-8 encoded before passed to Git (which uses utf-8 as default encoding for commit messages). This causes a wrongly-encoded log entry, and makes ikiwiki spew warnings as it creates recentchanges:
utf8 "\xF6" does not map to Unicode at /usr/share/perl5/IkiWiki/Rcs/git.pm line 36, <$OUT> line 57.
Malformed UTF-8 character (unexpected non-continuation byte 0x6e, immediately after start byte 0xf6) in pattern match (m//) at /usr/share/perl5/IkiWiki/Rcs/git.pm line 393.
utf8 "\xF6" does not map to Unicode at /usr/share/perl5/IkiWiki/Rcs/git.pm line 36, <$OUT> line 5.
(This is version 2.53.3~bpo40+1 for lack of a newer backport for sarge)
Please make sure that commit messages for Git are always utf-8.
This is a change by user mädduck to trigger the error.