Hi Denys !
>> Problem means it may make diagnosing other problems a hell.
Why is it hell? "strace -p1" works.
If you have a working strace ...
... or in other words: Do you have a working Busybox applet for this?
You are right, I do not use init. Respawn on error is not the only,
or the biggest problem it has.
http://busybox.net/~vda/init_vs_runsv.html
Ok, this story is funny to read, but has nothing to do with the problems
of Busybox init. And still there are people which dislike this
runit/runsv/runsvdir. I'm highly disagreeing with all that information
of daemons being scattered around so many directories and subdirectories
and files. I tried this and I got lost on even simple systems. That's
definitely not the way I like to have my system.
... but that does not change my mind, that Busybox init has a long
standing bug of uncontrolled and endless respawning processes, and it's
now at the time to solve this bug, anyhow!
I posted a simple change which stops this endless respawning for some
kinds of problems, until init gets a SIGHUP (reload inittab).
- This catches open problems with the console (a case which may be
detected in master, but this one is the only case, which may be handled
there).
- Exec failures, which usually return with status -1, stop the respawning.
- Getty may return status -1 for open problems (e.g. all pre login
prompt problems), and for problems when exec to login (as it was done in
several gettys I used). This won't endless respawn this console, until
someone could fix the reason and does a SIGHUP.
sysinit and runonce actions get not affected, and respawn actions
usually run after sysinit actions have gone, so system resources shall
all be available to start respawning.
If a process exits with any other value except the well known -1 status,
or if a process is terminated by a signal, it is always triggered for
restart and not stopped.
... but other solutions to fix the problem may also be welcome ... but
not if only unspecific redirection to use a different init mechanics.
--
Harald
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