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Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <932184.1710871728@warthog.procyon.org.uk> References: <932184.1710871728@warthog.procyon.org.uk> To: "Liam R. Howlett" Cc: dhowells@redhat.com, maple-tree@lists.infradead.org, linux-mm@kvack.org Subject: Re: kernel BUG at lib/maple_tree.c:1237! MIME-Version: 1.0 Date: Thu, 21 Mar 2024 15:09:12 +0000 Message-ID: <1415330.1711033752@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="us-ascii" Content-ID: <1415329.1711033752.1@warthog.procyon.org.uk> X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D9B341A0013 X-Stat-Signature: 1bpixzf35afn48n4y9nyedi3s9pk5n6a X-HE-Tag: 1711033762-911448 X-HE-Meta: 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 uFubkJFf r9wA9vrHG+xqQWSakmGS3/uFb5xV9djy+wRDbC73gygU+jAVm3GjZ9i1X4TaaNxtVCUU5COwfV1I/tfOjutLRLAm6UpWt9mr//7lvm/fkmc0eCknURA8wBE4XHYULLpyIJS8w2cEcF0xCUbz40sQlL9GgHsTZ9l5FEmEUHbzCTFiwGJOMY8ObKT+Kfv8Vlc5VX8T94hbr+91eTnVXaf3zqGmlCgJsQbRZs5bhJXVY8V1R8sW2mVmkIswZ/w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Okay, it seems this was due to a double free in error handling in my modified version of cifs. The reason it's happening in the maple tree code is that the netfs_io_subrequest struct might match the size of the maple tree nodes and be sharing a slab. David