linux-kernel - Re: [PATCH v8 0/1] kasan: Avoid sleepable page allocation from atomic context

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Message-ID: <53a86990-0aa5-4816-a252-43287f3451b8@gmail.com>
Date: Tue, 13 May 2025 18:43:56 +0200
From: Andrey Ryabinin <ryabinin.a.a@...il.com>
To: Alexander Gordeev <agordeev@...ux.ibm.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Daniel Axtens <dja@...ens.net>,
 Harry Yoo <harry.yoo@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 kasan-dev@...glegroups.com, linux-s390@...r.kernel.org,
 stable@...r.kernel.org
Subject: Re: [PATCH v8 0/1] kasan: Avoid sleepable page allocation from atomic
 context



On 5/13/25 5:21 PM, Alexander Gordeev wrote:
> Hi All,
> 
> Chages since v7:
> - drop "unnecessary free pages" optimization
> - fix error path page leak
> 
> Chages since v6:
> - do not unnecessary free pages across iterations
> 


Have you looked at boot failure report from kernel test robot ?
https://lkml.kernel.org/r/202505121313.806a632c-lkp@intel.com

I think the report is for v6 version, but I don't see evidence that it was
addressed, so the v8 is probably affected as well?


> Chages since v5:
> - full error message included into commit description
> 
> Chages since v4:
> - unused pages leak is avoided
> 
> Chages since v3:
> - pfn_to_virt() changed to page_to_virt() due to compile error
> 
> Chages since v2:
> - page allocation moved out of the atomic context
> 
> Chages since v1:
> - Fixes: and -stable tags added to the patch description
> 
> Thanks!
> 
> Alexander Gordeev (1):
>   kasan: Avoid sleepable page allocation from atomic context
> 
>  mm/kasan/shadow.c | 77 ++++++++++++++++++++++++++++++++++++++---------
>  1 file changed, 63 insertions(+), 14 deletions(-)
>