On Mon, 17 Jul 2000, Zhihui Zhang wrote:
>
> I am writing a KLD that gives me kernel fault each time I run 'ps' command
> after 'make unload'. The KLD has a system call to create several kernel
> threads by calling kthread_create(). During unload, I set flags to each
> threads so that they will call exit1() upon wakeup (sleep on a timeout).
> Before the last thread calls exit1(), it wakeup the kld unload process so
> that make 'unload' can finish. Is there anything wrong or better
> solutions?
>
> I also use vm_zone to allocate some data structes within the KLD. When
> unloading, I can use zfree() to free them except the zone header that I
> can not free(some_zone, M_ZONE). This is because M_ZONE is defined as
> *static* in vm_zone.c I wonder if this will cause memory leak after
> several loading and unloading the KLD.
>
> Finally, I want to know how to save the panic screen without hand writing
> it down. Any info on debugging under db> after fault?
>
> Any help is appreciated.
Thanks to those who have helped me privately. It is not a good idea to
use zone allocator with KLD. You must clear everything before unloading
the KLD. Any kernel threads can be reparented to initproc to avoid 'ps'
panic.
-Zhihui
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