From owner-freebsd-bugs@freebsd.org Mon Jan 11 16:11:03 2021 Return-Path: Delivered-To: freebsd-bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 9994C4DE1B1 for ; Mon, 11 Jan 2021 16:11:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 4DDzGH3dPpz4S2X for ; Mon, 11 Jan 2021 16:11:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 7C7724DE1B0; Mon, 11 Jan 2021 16:11:03 +0000 (UTC) Delivered-To: bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 7AA794DE40D for ; Mon, 11 Jan 2021 16:11:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4DDzGH1sMbz4S0Y for ; Mon, 11 Jan 2021 16:11:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 3318E1D269 for ; Mon, 11 Jan 2021 16:11:03 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 10BGB34H013175 for ; Mon, 11 Jan 2021 16:11:03 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 10BGB3PW013174 for bugs@FreeBSD.org; Mon, 11 Jan 2021 16:11:03 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 252582] Linuxulator: epoll create drop user data Date: Mon, 11 Jan 2021 16:11:03 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: ankohuu@outlook.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Jan 2021 16:11:03 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D252582 Bug ID: 252582 Summary: Linuxulator: epoll create drop user data Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: ankohuu@outlook.com Created attachment 221464 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D221464&action= =3Dedit patch for epoll create In function epoll_create_common calls epoll_fd_install when kern_kqueue success, I guess this is to initialize the proc emuldata space. But when epoll has allocated a descriptor equal to EPOLL_DEF_SZ, the above action will clear the user data of fd EPOLL_DEF_SZ.This should be an error. static int epoll_create_common(struct thread *td, int flags) { int error; error =3D kern_kqueue(td, flags, NULL); if (error !=3D 0) return (error); epoll_fd_install(td, EPOLL_DEF_SZ, 0); return (0); } In my scenario, the function epoll_fd_install will cause the electron gpu thread consumes a lot of cpu resources because the returned fd cannot be processed correctly. My patch is in the attachment. --=20 You are receiving this mail because: You are the assignee for the bug.=