linux-kernel - BUG: Bad page state in process systemd-udevd (was: [PATCH v9 bpf-next 1/9] x86/Kconfig: select HAVE_ARCH_HUGE_VMALLOC with HAVE_ARCH_HUGE

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Message-ID: <14444103-d51b-0fb3-ee63-c3f182f0b546@molgen.mpg.de>
Date:   Sat, 26 Mar 2022 19:46:21 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Song Liu <song@...nel.org>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kernel-team@...com, peterz@...radead.org, x86@...nel.org,
        iii@...ux.ibm.com, Song Liu <songliubraving@...com>,
        bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Rick P Edgecombe <rick.p.edgecombe@...el.com>,
        regressions@...ts.linux.dev
Subject: BUG: Bad page state in process systemd-udevd (was: [PATCH v9 bpf-next
 1/9] x86/Kconfig: select HAVE_ARCH_HUGE_VMALLOC with HAVE_ARCH_HUGE_VMAP)

#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@...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@...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
View attachment "linux-5.18-vmap-bad-page-state.txt" of type "text/plain" (271183 bytes)