Re: [syzbot] possible deadlock in vm_mmap_pgoff

[Peter Zijlstra]

On Wed, Apr 28, 2021 at 09:30:18AM -0400, Steven Rostedt wrote:

> > Break the lock chain by asking kworker to destroy perf event.
> > Thoughts other than workqueue are appreciated.
> 
> I think this could cause a problem with the delay.
> 
> This is called from event->destroy()
> 
> 
> 	if (event->destroy)
> 		event->destroy(event);
> 	module_put(pmu->module);

The uprobe and tracepoint pmus will never be a module.