[ts-7000] busybox init hanging....

["Yan Seiner" <>]

I've chasing a busybox init hanging issue for a while... Occassionally
the busybox init will just hang at "Freeing init memory'.  On my last
rebuild, it started happening consistently, so I did some testing...

I am using busybox 1.2.1, which is the latest stable release.

The problem is in init.c, in the console_init() function.  It tries to
autodetect the console; in the following snippet it wrongly figures
out that console is at /dev/tts/1, rather than /dev/ttyAM1:

                if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
                        /* this is a serial console */
                        snprintf(console, sizeof(console) - 1,
SC_FORMAT, sr.line);
                } 

It then goes on to try and open that device:

while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0 && tried < 2) {...}

and the system hangs.  It apparently hangs totally, since after this
call the system will no longer respond to pings.

I am not much of a console/system programmer, so I would like to know
if there is a general fix for this - can we make the autodetection
work?  For now, I've brute-forced this to skip the autodetection and
just open /dev/ttyAM1, which works fine.

--Yan






 
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