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AJvYcCVI0UEhalvhmvqspxMZT8Tah4Go4Lw9TGKIHs6XVZC1T4C6++Dei89BAWQHfEw3QNep7+bRULT70IRVgQH3I7GIfSs= X-Gm-Message-State: AOJu0YzaEhMmNm8NQehR687nBUZHAHe55zoRUIAVudmpfqyV8lHV6M11 bMEr8uMmQ7AFg5HWwx6j4bZ3uzmlwo669Ax3RudUA2d6W+/jjiRTyybp1/dLg6hl5KiHFFQ0UVB 4VCAYECPUN1Ak/nBpw//s/cZfm4M= X-Google-Smtp-Source: AGHT+IES/nnSEmMxi/+v1o8+8MwujeaTbAGsycbSSBUrukrvLxCCkxgHNlojWIOUwNe1CEXUus8ZuUUuprvy1G39u9A= X-Received: by 2002:a05:6214:3005:b0:6a0:e713:2121 with SMTP id 6a1803df08f44-6a151384c17mr62184766d6.0.1715255983399; Thu, 09 May 2024 04:59:43 -0700 (PDT) MIME-Version: 1.0 References: <0672f0b7-36f5-4322-80e6-2da0f24c101b@redhat.com> In-Reply-To: <0672f0b7-36f5-4322-80e6-2da0f24c101b@redhat.com> From: Mikhail Gavrilov Date: Thu, 9 May 2024 16:59:30 +0500 Message-ID: Subject: Re: 6.9/BUG: Bad page state in process kswapd0 pfn:d6e840 To: David Hildenbrand Cc: Linux List Kernel Mailing , Linux Memory Management List Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 638DEC000E X-Stat-Signature: dp68i7tb5yw1gy49f3mfh6iypng8nyyw X-Rspam-User: X-HE-Tag: 1715255984-828608 X-HE-Meta: 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 JRT0iFUA vXEVfmk5148HvSedqngYW7BXcy5BYgFtnrDfle5CGBGso6u6Z6bpKux43H6q0vGamF0Irrg6X/Rk6PaWylN3v/Z2o/e02MqzisSC11HXoERX9zq3KncM2ODv+uVMnvtHFC2SMbv49dNrCbbeNDbi8xLT+ZjVf84oxELi9gd8LPvbCNn9JqA3DBSZbL6ymosFOo5M2doteb6Z3qCk48rQnvpKFqpUwg43FZPcV0/09WG/8DvuF2szqhsoV6ZDJGrFtREKvrFrB3JQ72oymbNit5LeBw0LcQSo7I0hhLNVETSLmF/OvjoNz9R9lUQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.066972, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, May 8, 2024 at 10:45=E2=80=AFPM David Hildenbrand wrote: > > "page dumped because: non-NULL mapping" > > Is the relevant bit. We are freeing a page, but page->mapping is not > NULL. IIUC, it might happen under memory pressure when reclaiming memory. > > It's weird that only you are seeing that, if it would be something > "obvious" I would expect multiple reports :/ > Maybe because the problem is really difficult to reproduce (rare combination of the kernel build option and workload). I even thought that the problem was fixed because it did not reproduce itself for a week. But yesterday when it happened again with the kworker process, I stopped doubting that it was fixed. Now I am concerned with the question of how to be as useful as possible when reproducing bug again? --=20 Best Regards, Mike Gavrilov.