On 05-Oct-00 Boris Popov wrote:
> Hello,
>
> Currently I'm trying to make KLD which uses kernel threads
> unloadable under recent -current. The prototype of functions looks like
> this:
>
> void
> my_thread(void*arg)
> {
> while(wearewanted) {
> do_something();
> tsleep();
> }
> exited = 1;
> kthread_exit(0);
> }
>
> void
> my_unload()
> {
> wearewanted = 0;
> while (!exited)
> tsleep(1sec);
> }
>
> my_unload() function called from the module unload event which
> issued from the kldunload() syscall.
>
> Unfortunately, kernel panics in the mtx_exit_hard() function.
> After some examination I've found that two fields in the Giant mutex
> structure set to unexpected values:
> ----
> empty mtx_blocked for mutex Giant
> mtx_contested not in any list for mutex Giant
> ----
>
> These messages printed by added diagnostics code. With this patch
> (see attachment) it is possible to load and unload KLD without any
> problems on UP machine except that the above messages printed. However,
> I'm don't know if they are correct. (btw, 4.1 doesn't have this problem).
>
> Any ideas why this happened and how to fix it ?
> --
> Boris Popov
> http://www.butya.kz/~bp/
--
John Baldwin <[EMAIL PROTECTED]> -- http://www.FreeBSD.org/~jhb/
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