PowerPC: Random memory corruption causing kernel oops on Power11

Greetings!!!

Kernel 7.1.0-rc5-next-20260528 crashes randomly on IBM Power11 hardware. 
Attached is the config file.

**System:**
- Hardware: IBM 9080-HEX Power11, pSeries
- Broken: 7.1.0-rc5-next-20260528
- Config: 64K pages, Radix MMU


**Problem:**
Different crash at each reboot.


**Example Crash 1:**

[    4.678016] BUG: Unable to handle kernel data access at 
0xbffffffefec10628
[    4.678112] NIP [c008000004e3c74c] 
xfs_dir2_block_lookup_int+0xd4/0x300 [xfs]
[    4.678281] [c000000005eaf7d0] [c008000004e3c6d4] 
xfs_dir2_block_lookup_int+0x5c/0x300 [xfs]
[    4.678363] [c000000005eaf850] [c008000004e3d56c] 
xfs_dir2_block_lookup+0x44/0x1e0 [xfs]


**Example Crash 2:**

[    6.327116] BUG: Unable to handle kernel data access at 
0x762f736563697695
[    6.327242] NIP [c00000000073cf34] __refill_obj_stock+0x74/0x2c0
[    6.327261] [c0000013ffdbfd10] [c0000000007418b8] 
obj_cgroup_uncharge+0x48/0x70
[    6.327271] [c0000013ffdbfd50] [c00000000062fffc] 
free_percpu.part.0+0x12c/0x630


If you happen to fix this, please add below tag.

Reported-by: Venkat Rao Bagalkote <redacted>


Regards,

Venkat.