Re: resctrl mount fail on v6.13-rc1

[Reinette Chatre <reinette.chatre@intel.com>]

Hi Tony,

On 12/2/24 1:42 PM, Luck, Tony wrote:
> Anyone better a decoding lockdep dumps then me make sense of this?
> 
> All I did was build v6.13-rc1 with (among others)
> 
> CONFIG_PROVE_LOCKING=y
> CONFIG_PROVE_RAW_LOCK_NESTING=y
> CONFIG_PROVE_RCU=y
> 
> and then mount the resctrl filesystem:
> 
> $ sudo mount -t resctrl resctrl /sys/fs/resctrl
> 
> There are only trivial changes to the resctrl code between
> v6.12 (which works) and v6.13-rc1:
> 
> $ git log --oneline v6.13-rc1 ^v6.12 -- arch/x86/kernel/cpu/resctrl
> 5a4b3fbb4849 Merge tag 'x86_cache_for_v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> 9bce6e94c4b3 x86/resctrl: Support Sub-NUMA cluster mode SNC6
> 29eaa7958367 x86/resctrl: Slightly clean-up mbm_config_show()
> 
> So something in kernfs? Or the way resctrl uses kernfs?

I am not seeing this but that may be because I am not testing with
selinux enabled. My test kernel has:
# CONFIG_SECURITY_SELINUX is not set

I am also not running with any btrfs filesystems. 

Is this your usual setup in which you are seeing this the first time? Is it
perhaps possible for you to bisect?

The subject states "resctrl mount fail" - could you please confirm if
resctrl cannot be mounted in addition to the lockdep warning?

Reinette