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Tue, 13 Sep 2022 07:34:39 -0700 (PDT) Received: from zen (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id 94B121FFB7; Tue, 13 Sep 2022 15:34:38 +0100 (BST) References: User-agent: mu4e 1.9.0; emacs 28.1.91 From: Alex =?utf-8?Q?Benn=C3=A9e?= To: Andreas Schwab Cc: qemu-devel@nongnu.org Subject: Re: qemu-x86_64 runs out of memory Date: Tue, 13 Sep 2022 15:33:57 +0100 In-reply-to: Message-ID: <87sfkvz6kh.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=2a00:1450:4864:20::330; envelope-from=alex.bennee@linaro.org; helo=mail-wm1-x330.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Andreas Schwab writes: > $ cat mmap.c > #include > #include > > int > main (void) > { > void *A; > size_t L =3D 0, U, Max =3D 0; > for (U =3D 1; ; U *=3D 2) > { > A =3D mmap (0, U, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORE= SERVE, -1, 0); > if (A =3D=3D (void *) -1) > break; > else > munmap (A, U); > } > while (L + 1 < U) > { > size_t M =3D L + (U - L) / 2; > A =3D mmap (0, M, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORE= SERVE, -1, 0); > if (A =3D=3D (void *) -1) > U =3D M; > else > { > Max =3D M; > munmap(A, M); > L =3D M; > } > } > printf ("%zx\n", Max); > } > $ cc -O2 -g -Wall -std=3Dgnu11 -g mmap.c -o mmap > $ ./mmap=20 > 7f672e5ff000 > $ qemu-x86_64 ./mmap > Killed This is probably the same as bug: https://gitlab.com/qemu-project/qemu/-/is= sues/967 --=20 Alex Benn=C3=A9e