One apparent problem with this implementation
> + *
> + * This verifies that the fault happens in kernel space
> + * (error_code & 4) == 0, and that the fault was not a
> + * protection error (error_code & 1) == 0.
> - if (address >= TASK_SIZE)
> + if (address >= TASK_SIZE && !(error_code & 5))
> goto vmalloc_fault;
address might be from the following vmalloc fault. The error code would
indicate user space, so we would do a bogus user space fix up for vmalloc
space, fault and die.
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