linux-kernel - Re: [BUG][powerpc] OOPs: Kernel access of bad area during zram swap write

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Message-ID: <29cec5ca090a1b833c6a68d103ef9e15@linux.ibm.com>
Date: Mon, 19 May 2025 23:37:13 +0530
From: Misbah Anjum N <misanjum@...ux.ibm.com>
To: Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: Ritesh Harjani <riteshh@...ux.ibm.com>, yosry.ahmed@...ux.dev,
        linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org, maddy@...ux.ibm.com,
        mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu,
        naveen@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG][powerpc] OOPs: Kernel access of bad area during zram swap
 write - kswapd0 crash

On 2025-05-07 06:03, Sergey Senozhatsky wrote:
> Hi,
> 
> On (25/05/06 11:09), Misbah Anjum N wrote:
>> I am facing this issue even with the latest kernel: 
>> 6.15.0-rc4-g5721cf0b9352
>> The suspecting commit is: 44f76413496ec343da0d8292ceecdcabe3e6ec16. 
>> The
>> commit introduces zs_obj_write() function.
>> Link: 
>> https://github.com/torvalds/linux/commit/44f76413496ec343da0d8292ceecdcabe3e6ec16
> 
> Can you try the following fix
> https://lore.kernel.org/linux-mm/20250504110650.2783619-1-senozhatsky@chromium.org

Hi,

Thank you for the patch. I can confirm that it resolves the issue. After 
applying it, the kernel panic no longer occurs during memory reclaim 
with in my KVM guest testing environment. The Avocado-VT functional 
tests now complete successfully.

Patch:
Author: Sergey Senozhatsky <senozhatsky@...omium.org>
Date:   Sun May 4 20:00:22 2025 +0900
     zsmalloc: don't underflow size calculation in zs_obj_write()

Thank You,
Misbah Anjum N