Re: [linux-next:master] [slub] b82c7add4c: WARNING:at_mm/slub.c:#slab_free_after_rcu_debug

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On Wed, Aug 07, 2024 at 02:54:52PM +0200, Jann Horn wrote:
> Hi!
> 
> On Wed, Aug 7, 2024 at 10:42 AM kernel test robot <oliver.sang@xxxxxxxxx> wrote:
> > hi, Jann Horn,
> >
> > as you educated me last time, I know this b82c7add4c is v5:)
> > the CONFIG_SLUB_RCU_DEBUG is really enabled, and we saw lots of WARNING in dmesg
> > https://download.01.org/0day-ci/archive/20240807/202408071606.258f19a0-oliver.sang@xxxxxxxxx/dmesg.xz
> >
> > not sure if it's expected? below report (parsed one of WARNING) just FYI.
> 
> Thanks a lot, and sorry that my series is creating so much work for you...

not at all! our team's work is testing linux kernel and helping developers
regarding with increasing kernel code quality.

> 
> Okay, all these warnings at mm/slub.c:4550 are for the "if
> (WARN_ON(is_kfence_address(rcu_head)))" check, which was wrong up to
> v5 and fixed in v6. syzbot had also encountered that bug...

thanks a lot for information!

> 
> Thanks for letting me know, and have a nice day!




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