Re: try_module_get and friends

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Steven Rostedt <rostedt@xxxxxxxxxxx> writes:

> [...]
> There's a theoretical potential for the system to crash in -rt when
> unloading a module. Simply because interrupts are threads.
>
> Some device has an interrupt handler that is called and preempted.
> At that moment the module for that device is unloaded. [...]
> Since the code for the interrupt handler no longer exists... KABOOM!

Perhaps you can identify those modules that have asked for interrupts,
and block only them from unloading.  Or, would it be outrageously
expensive to increment the module refcount while one of its interrupt
handlers is running?

- FChE
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