This seems to be intentional behaviour by cron.
It checks if /etc/crontab is either group- or other- writeable, and if
so, skips the file. The comment in the source is: /* Check
to make sure that the crontab is writable only by root */
from database.c, line 429:
/* Check to make sure that the crontab is writable only by root */
if ((statbuf->st_mode & S_IWGRP) || (statbuf->st_mode & S_IWOTH)) {
log_it(fname, getpid(), "WRONG INODE INFO", tabname);
goto next_crontab;
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https://bugs.launchpad.net/bugs/741979
Title:
cron ignores group-writable crontab, with obscure message
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