#regzbot introduced: fac54e2bfb5be2b0bbf115fe80d45f59fd773048
#regzbot title: BUG: Bad page state in process systemd-udevd


Dear Song,


Am 04.02.22 um 19:57 schrieb Song Liu:
> From: Song Liu <songliubraving@fb.com>
> 
> This enables module_alloc() to allocate huge page for 2MB+ requests.
> To check the difference of this change, we need enable config
> CONFIG_PTDUMP_DEBUGFS, and call module_alloc(2MB). Before the change,
> /sys/kernel/debug/page_tables/kernel shows pte for this map. With the
> change, /sys/kernel/debug/page_tables/ show pmd for thie map.
> 
> Signed-off-by: Song Liu <songliubraving@fb.com>
> ---
>   arch/x86/Kconfig | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 6fddb63271d9..e0e0d00cf103 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -159,6 +159,7 @@ config X86
>   	select HAVE_ALIGNED_STRUCT_PAGE		if SLUB
>   	select HAVE_ARCH_AUDITSYSCALL
>   	select HAVE_ARCH_HUGE_VMAP		if X86_64 || X86_PAE
> +	select HAVE_ARCH_HUGE_VMALLOC		if HAVE_ARCH_HUGE_VMAP
>   	select HAVE_ARCH_JUMP_LABEL
>   	select HAVE_ARCH_JUMP_LABEL_RELATIVE
>   	select HAVE_ARCH_KASAN			if X86_64

Testing Linus’ current master branch, Linux logs critical messages like 
below:

     BUG: Bad page state in process systemd-udevd  pfn:102e03

I bisected to your commit fac54e2bfb5 (x86/Kconfig: select 
HAVE_ARCH_HUGE_VMALLOC with HAVE_ARCH_HUGE_VMAP).


Kind regards,

Paul