[linux-next20260917] BUG: Bad page map in process

Greetings!!!

IBM CI has reported following boot warning on Power11 pseries machine 
running linux-next 7.3.0-rc3-next-20260917.


Traces:

[    4.944846] BUG: Bad page map in process rtas_errd pte:c00000001fff0786
[    4.944850] pgd:8000000064e76009 p4d:8000000064e76009 
pud:8000000064013009 pmd:8000000064011009
[    4.944858] addr:00003fffa9382000 vm_flags:080000fb 
anon_vma:0000000000000000 mapping:c0000000054443a0 index:1fff0
[    4.944865] file:mem fault:0x0 mmap:0x0 mmap_prepare: 
mmap_mem_prepare read_folio:0x0
[    4.944875] CPU: 17 UID: 0 PID: 773 Comm: rtas_errd Not tainted 
7.3.0-rc3-next-20260917 #1 PREEMPT(lazy)
[    4.944877] Hardware name: IBM,9080-HEX Power11 (architected) 
0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries
[    4.944879] Call Trace:
[    4.944879] [c00000001791b4e0] [c00000000135a92c] 
dump_stack_lvl+0x8c/0xf0 (unreliable)
[    4.944885] [c00000001791b510] [c0000000006708c0] 
print_bad_page_map.part.0.constprop.0+0x18c/0x260
[    4.944887] [c00000001791b5f0] [c000000000674fa4] 
vm_normal_page+0x140/0x17c
[    4.944890] [c00000001791b630] [c00000000067648c] 
zap_present_ptes.constprop.0+0x9c/0x9ac
[    4.944893] [c00000001791b700] [c000000000677038] 
zap_pte_range+0x29c/0x5f4
[    4.944895] [c00000001791b840] [c000000000677500] 
zap_pmd_range.isra.0+0x170/0x310
[    4.944898] [c00000001791b8d0] [c000000000677a00] 
__zap_vma_range+0x360/0x4cc
[    4.944900] [c00000001791b980] [c0000000006780e0] unmap_vmas+0x98/0x1a0
[    4.944903] [c00000001791ba10] [c0000000006b0f68] unmap_region+0x94/0x108
[    4.944905] [c00000001791bad0] [c0000000006b1c7c] 
vms_complete_munmap_vmas+0x11c/0x2c8
[    4.944907] [c00000001791bb60] [c0000000006b273c] 
do_vmi_align_munmap+0x1ac/0x1f8
[    4.944909] [c00000001791bca0] [c0000000006b52c0] __vm_munmap+0xdc/0x1fc
[    4.944911] [c00000001791bd60] [c00000000068b154] sys_munmap+0x28/0x3c
[    4.944913] [c00000001791bd80] [c000000000032150] 
system_call_exception+0x190/0x4b0
[    4.944916] [c00000001791be50] [c00000000000d05c] 
system_call_vectored_common+0x15c/0x2ec
[    4.944919] ---- interrupt: 3000 at 0x3fffa9143754
[    4.944920] NIP:  00003fffa9143754 LR: 00003fffa9143754 CTR: 
0000000000000000
[    4.944922] REGS: c00000001791be80 TRAP: 3000   Not tainted 
(7.3.0-rc3-next-20260917)
[    4.944923] MSR:  800000000280f033 
<SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE>  CR: 44002408  XER: 00000000
[    4.944928] IRQMASK: 0
[    4.944928] GPR00: 000000000000005b 00003fffc0a69a20 00003fffa9237d00 
00003fffa9382000
[    4.944928] GPR04: 0000000000001000 0000000000000002 0000000000000000 
0000000000000001
[    4.944928] GPR08: 000000000000001b 0000000000000000 0000000000000000 
0000000000000000
[    4.944928] GPR12: 0000000000000000 00003fffa937f860 0000000000000000 
00003fffa9383550
[    4.944928] GPR16: 0000000000000000 00003fffc0a69cd8 00003fffc0a69ca0 
68746150706d7544
[    4.944928] GPR20: 00003fffc0a69c10 0068746150706d75 636170614364656c 
747365526f747541
[    4.944928] GPR24: 000000013ad9e130 00003fffc0a6a0d8 6d726f6674616c50 
00003fffa92f5ee0
[    4.944928] GPR28: 00003fffa9382000 000000001fff0000 0000000000000009 
0000000000100000
[    4.944945] NIP [00003fffa9143754] 0x3fffa9143754
[    4.944946] LR [00003fffa9143754] 0x3fffa9143754
[    4.944947] ---- interrupt: 3000


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

Reported-by: Venkat Rao Bagalkote <redacted>


Regards,

Venkat.