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Sat, 19 Sep 2026 00:21:48 -0700 (PDT) Received: from localhost.localdomain ([240e:b8f:1df9:a600:c693:b19f:ada0:748]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-877a6ae905fsm742901b3a.3.2026.09.19.00.21.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 19 Sep 2026 00:21:48 -0700 (PDT) Date: Sat, 19 Sep 2026 15:21:41 +0800 From: Vernon Yang To: Venkat Rao Bagalkote Cc: "linux-mm@kvack.org" , LKML , linuxppc-dev , Madhavan Srinivasan , Ritesh Harjani , Shrikanth Hegde , Lorenzo Stoakes , Andrew Morton , Liam.Howlett@oracle.com Subject: Re: [linux-next20260917] BUG: Bad page map in process Message-ID: References: X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Fri, Sep 18, 2026 at 12:38:29PM +0530, Venkat Rao Bagalkote wrote: > 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   > 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 Hi Venkat, Thanks for reporting this bug. I also reproduced this phenomenon on my local machine and found that Lorenzo[1] has already fixed the bug, and Mike[2] also provided a detailed analysis. [1] https://lore.kernel.org/linux-mm/aq06hcheI4OGi_3A@gremlin/ [2] https://lore.kernel.org/linux-mm/aquz9Z9JrK_H_E0g@kernel.org/ -- Cheers, Vernon