[BUG][powerpc] OOPs: Kernel access of bad area during zram swap write - kswapd0 crash

[Misbah Anjum N]

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 at chromium.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