Re: [next-20240925] possible circular locking: uart vs kmemleak

[Sergey Senozhatsky]

On (24/09/26 15:32), Petr Mladek wrote:
> On Thu 2024-09-26 13:07:15, Sergey Senozhatsky wrote:
> > Greetings,
> > 
> > Ran into the following issue today.  It's sort of interesting, not sure
> > what even to do about it.  The
> > 
> > 	uart -> tty -> mm /* kmalloc -> kmemleak */
> > 
> > chain looks problematic, it certainly overlaps with
> > 
> > 	mm -> printk -> uart  /* which can kmalloc and re-enter mm -> kmemleak? */
> 
> I believe that it will get solved by the uart console driver
> conversion to nbcon. I should remove the path:
> 
> 	printk -> uart
> 
> or more precisely, it should remove the path:
> 
> 	console_owner --> &port_lock_key
> 
> The patchset with the uart 8250 console driver conversion is still
> pending a review, see the last version at
> https://lore.kernel.org/r/20240913140538.221708-1-john.ogness@xxxxxxxxxxxxx

It does fix the issue for me, you are right.  Thanks for the pointers.