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Date: Wed, 16 Jun 1999 14:32:05 +0400 (MSD)
From: isupov@moonhe.jinr.ru
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To: FreeBSD-gnats-submit@freebsd.org
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Subject: kern/12239: KLD module's load/unload errors handled in strange way (or ignored ?)
Sender: owner-freebsd-bugs@FreeBSD.ORG
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>Number:         12239
>Category:       kern
>Synopsis:       KLD module's load/unload errors handled in strange way (or ignored ?)
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jun 16 04:10:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Isupov A.Yu.
>Release:        FreeBSD 3.2-RELEASE i386
>Organization:
JINR, LHE
>Environment:

	FreeBSD 3.2-RELEASE i386 (need nothing else than standard installation)

>Description:

	1) If in a KLD module <sometning_mod>.ko the function
	<sometning_mod>_modevent(struct module *module, int cmd, void *arg)
	returns error at loading time (f.e. :

		case MOD_LOAD :
			if (...) {
				error = ENXIO;
				break;
			}

	), kldload(8) returns 0 (success !!!) and we have picture of the
	following style:

	% kldstat -v
	Id Refs Address    Size     Name
	...
	30    1 0xc0921000 2000     <something_mod>.ko
		Contains modules:
			Id Name

	instead of full absence of <something_mod>.ko here (as was in the
	3.0-RELEASE).
	Such strange object not contains syscall, realised in
	<something_mod>.ko, and can be successfully removed by kldunload(8),
	but what the reasons for its appearing at all ?!!

	2) If in a KLD module <sometning_mod>.ko the same function
	returns error at unloading time (f.e. :

		case MOD_UNLOAD :
			if (...) {
				error = ETXTBSY;
				break;
			}

	), kldunload(8) returns 1 (nonzero, this seems correct...),
	<something_mod>.ko still appear in the kldstat output (

	% kldstat -v
	Id Refs Address    Size     Name
	...
	31    1 0xc0921000 2000     <something_mod>.ko
		Contains modules:
			Id Name
			45 <something_mod>

	), but syscall, which <something_mod> realises, already removed:

	% /usr/share/examples/kld/syscall/test/test
	Bad system call - core dumped

	(test obtains 12 signal) !!!

>How-To-Repeat:

	Play with /usr/share/examples/kld/syscall/module/syscall.c .

>Fix:
	
	1) Don't know, at least because module_register_init() in
	/sys/kern/kern_module.c of type void now.
	2) ???
	What are you think, described behaviour is a bug or a feature ?


>Release-Note:
>Audit-Trail:
>Unformatted:


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