linux-kernel - Re: [tip:x86/mm] [x86/mm] 1248fb6a82: Kernel_panic-not_syncing:kasan_populate_pmd:Failed_to_allocate

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Message-ID: <1c3209e7-a184-22f7-096c-874a2f77ce55@gmail.com>
Date:   Fri, 28 Oct 2022 00:35:44 +0300
From:   Andrey Ryabinin <ryabinin.a.a@...il.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        kernel test robot <yujie.liu@...el.com>
Cc:     oe-lkp@...ts.linux.dev, lkp@...el.com,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Seth Jenkins <sethjenkins@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev@...glegroups.com, "Yin, Fengwei" <fengwei.yin@...el.com>
Subject: Re: [tip:x86/mm] [x86/mm] 1248fb6a82:
 Kernel_panic-not_syncing:kasan_populate_pmd:Failed_to_allocate_page



On 10/27/22 18:12, Dave Hansen wrote:
> On 10/25/22 08:39, Andrey Ryabinin wrote:
>> KASAN tries to allocate shadow memory for the whole cpu entry area.
>> The size is CPU_ENTRY_AREA_MAP_SIZE/8 and this is obviously fails after your patch.
>> The fix this might be something like this:
>>
>> ---
>>  arch/x86/include/asm/kasan.h |  2 ++
>>  arch/x86/mm/cpu_entry_area.c |  3 +++
>>  arch/x86/mm/kasan_init_64.c  | 16 +++++++++++++---
>>  3 files changed, 18 insertions(+), 3 deletions(-)
> 
> Andrey, if you have a minute, could you send this as a real patch, with
> a SoB?

Done, It slightly different because there was a bug in vaddr->nid calculation.