OK, this is the original problem I was trying to figure with the debug
version of init. In house we have an app that was starting a process
manager from init. It was starting after the sysinit entry and before
the runlevel script entries (it needed to be around when the runlevel
scripts were ran to respond to requests from application rc scripts to
start there processes). The entry looked something like this:
# System initialization.
si::sysinit:/etc/rc.d/rc.sysinit
> pm:4:respawn:/sbin/procmgr
l0:0:wait:/etc/rc.d/rc 0
l1:1:wait:/etc/rc.d/rc 1
l2:2:wait:/etc/rc.d/rc 2
l3:3:wait:/etc/rc.d/rc 3
l4:4:wait:/etc/rc.d/rc 4
l5:5:wait:/etc/rc.d/rc 5
l6:6:wait:/etc/rc.d/rc 6
This worked fine sometimes, but other times it would not get ran
at all, and init would not continue on and run the runlevel 4 rc
scripts. I created the file:
/etc/initscript
Which gets called by init as a proxy for starting processes if it exists,
and I could see that it would call the rc.sysinit stuff, but it would
never call the process manager when the problem occured. I then put
a debug version of init on the system (the subject of the previous email)
and eventually when I got the debug version rebooting I saw the following:
Enabling local filesystem quotas: [ OK ]
Enabling swap space: [ OK ]
INIT: chld_handler: unknown child 67 exited.
INIT: Checking for children to start"(E*�_chld_handler: unknown child 375
exited.
INIT: SYSINIT -> BOOT
And there she sat. Note it had ran rc.sysinit, and then it caught a
sigchild from an orphaned child of rc.sysinit or one of its children.
After that it starts checking to see what it needs to start next.
Note, in that ouytput we have a little bit of garbage (an internal buffer
overflow?). After it prints "SYSINIT -> BOOT", no more output occurs,
and since it has not ran the rc scripts (or are started the gettys) you
have system that is effectively hung.
Any ideas of where I should look in the init code or how I might debug
this further?
Thanks...james
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