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SubjectRe: 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)
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Dear Song,


Am 26.03.22 um 19:46 schrieb Paul Menzel:
> #regzbot introduced: fac54e2bfb5be2b0bbf115fe80d45f59fd773048
> #regzbot title: BUG: Bad page state in process systemd-udevd

> 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).

Sorry, I forget to mention, that this is a 32-bit (i686) userspace, but
a 64-bit Linux kernel, so it might be the same issue as mentioned in
commit eed1fcee556f (x86: Disable HAVE_ARCH_HUGE_VMALLOC on 32-bit x86),
but didn’t fix the issue for 64-bit Linux kernel and 32-bit userspace.


Kind regards,

Paul

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