From: andrewm@uow.edu.au (Andrew Morton)
Subject: Re: test12-pre6
Date: 6 Dec 2000 13:04:26 +0100
Organization: innominate AG, Berlin, Germany
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Wakko Warner wrote:
> 
> >  - pre6:
> >     - Andrew Morton: exec_usermodehelper fixes
> 
> pre4 oopsed all over the place on my alpha with modules and autoloading
> turned on as soon as it mounted / and freed unused memory.  I take it this
> was seen on i386 as well?

No...  The problems showed themselves a little more subtly than that,
although in the pre5 version there was potential for schedule_task tasks to
be queued before the kernel thread which handles them was started.

This shouldn't normally be a problem, but it becomes a fatal problem if
someone tries to schedule a task and then synchronously waits
for it to complete, as the new exec_usermodehelper does.

This change didn't affect module loading per-se.  But the
kernel does try to run /sbin/hotplug from deep within sys_insert_module
and sys_delete_module, so they're related.

> Will try pre6.

Please.

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