On 9/30/20 12:15 AM, Stephane Eranian wrote: >> + /* >> + * Software page-table walkers must disable IRQs, >> + * which prevents any tear down of the page tables. >> + */ >> + local_irq_save(flags); >> + >> + size = __perf_get_page_size(current->active_mm, addr); >> + > When I tested on my kernel, it panicked because I suspect > current->active_mm could be NULL. Adding a check for NULL avoided the > problem. But I suspect this is not the correct solution.
Did you happen to capture the oops? I can _imagine_ scenarios where current->active_mm could be NULL, I just can't find any obvious ones in the code.
