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Bug 653672 - sys-apps/sysvinit-2.89-r1 spawns extra non-configured agetty on console tty
Summary: sys-apps/sysvinit-2.89-r1 spawns extra non-configured agetty on console tty
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo's Team for Core System packages
Depends on:
Reported: 2018-04-21 09:09 UTC by Daniel Dawson
Modified: 2018-04-21 10:46 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---


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Description Daniel Dawson 2018-04-21 09:09:08 UTC
This version is spawning an extra agetty on whatever tty is specified as console on the kernel command line, making it unusable due to the two instances clashing over input. After some investigation, I found the following in the source, in src/init.c line 1349 (function check_kernel_console()):

        if (!strncmp(dev, "tty", 3))
                strncpy(id, dev+3, sizeof(id));
                strncpy(id, dev, sizeof(id));

        for(old = newFamily; old; old = old->next) {
                if (!strcmp(old->id, id)) {
                        dup = 1;
        if (!dup) {
                sprintf(ch->process, "/sbin/agetty -L -s 115200,38400,9600 %s vt102", dev);

IIUC, this is searching through the inittab rules, trying to find any whose id matches the value of the "console" parameter (or the part after "tty" if that's present), previously copied to dev. If it doesn't find any, then it adds an extra rule—one not specified in inittab—that launches the command seen at the end.

I assume this is meant as some sort of failsafe. The question is, why is it requiring inittab to follow the tradition of gettys being launched on tty{1,2,3,...} in rules with ids "1", "2", "3", etc. (especially when the man page essentially calls it outdated)? Gentoo's own default inittab certainly doesn't, guaranteeing a problem unless the admin happens to like that tradition enough to edit inittab. For that matter, why is it caring about the id at all, beyond it being a mere identifier? And why is it assuming a serial console? This all seems very questionable to me.