Hmm. According to the C standard, strcpy() with overlapping buffers gives undefined behavior and that's what I'm seeing.
http://www.opengroup.org/onlinepubs/000095399/functions/strcpy.html So, it's not a libc6 issue. But, I wonder why it seems to be only happening with x64 only now? Anyway, I've attached a more official patch. It's been tested on testing-x64 and stable-x32. /dc.
diff -Nur sysklogd-1.5.orig/syslogd.c sysklogd-1.5/syslogd.c --- sysklogd-1.5.orig/syslogd.c 2007-07-04 13:04:01.000000000 -0600 +++ sysklogd-1.5/syslogd.c 2010-07-02 08:12:56.000000000 -0600 @@ -2392,7 +2392,7 @@ if (*p == '\0' || *p == '#') continue; #if CONT_LINE - strcpy(cline, p); + memmove(cline, p, strlen(p)+1); #endif for (p = strchr(cline, '\0'); isspace(*--p);); #if CONT_LINE
