kld regression

Andriy Gapon avg at icyb.net.ua
Thu Jan 31 07:06:01 PST 2008


on 31/01/2008 14:39 Andriy Gapon said the following:
> on 31/01/2008 13:07 John Baldwin said the following:
>> On Wednesday 30 January 2008 12:39:14 pm Andriy Gapon wrote:
>>> The problem is as follows:
>>> 1. put udf_load="YES" in loader.conf
>>> 2. you can mount and unmount udf filesystems
>>> 3. you can kldunload udf if no udf filesystems are mounted
>>> 4. now mount udf fs while udf.ko is unloaded
>>> 5. udf is auto loaded and fs is mounted
>>> 6. unmount fs
>>> 7. try to kldunload udf
>>> kldunload: can't unload file: Device busy
>>> kernel message: kldunload: attempt to unload file that was loaded by the
>>> kernel
>>>
>>> Yeah, it was loaded by kernel indeed, but WTF - what is the difference
>>> from manual/loader.conf loading and why I can not manage my modules as I
>>> wish?
>> Hmm, the relevant code (vfs_init.c) hasn't changed in 6.x since 6.0.  There 
>> were some changes in 7.0, but this should work in both branches.  What is the 
>> previous release that this worked on?
>>
> 
> Maybe I was wrong when I called this regression, but this was very
> surprising behavior for me. And in 5.X I did a lot of udf
> debugging/experimenting and never encountered such a problem. Maybe I
> always did kldload before mount, I can't tell now.
> Anyway, this seems like an annoyance at the very least, pinning a kernel
> module without any important reasons.
> 

Hmm, I found one difference with previous setups: in step 1 I also have
udf_iconv_load="YES" and udf_iconv.ko module is what seems to prevent
udf.ko from unloading in step 7. I can actually unload udf_iconv and
then I am able again to unload udf.

Still don't understand what is a big difference here.

And if I had UDF_ICONV built into kernel then I wouldn't have this
work-around.

-- 
Andriy Gapon


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