From owner-freebsd-bugs@freebsd.org Sat Jul 18 13:16:07 2020 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 8D7CC369720 for ; Sat, 18 Jul 2020 13:16:07 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (mailman.nyi.freebsd.org [IPv6:2610:1c1:1:606c::50:13]) by mx1.freebsd.org (Postfix) with ESMTP id 4B87m73K9Dz4JSs for ; Sat, 18 Jul 2020 13:16:07 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 6F98A36971F; Sat, 18 Jul 2020 13:16:07 +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 6F5F836971E for ; Sat, 18 Jul 2020 13:16:07 +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 4B87m72MX5z4Jf2 for ; Sat, 18 Jul 2020 13:16:07 +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 3379EB416 for ; Sat, 18 Jul 2020 13:16:07 +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 06IDG7SG066641 for ; Sat, 18 Jul 2020 13:16:07 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 06IDG7ds066640 for bugs@FreeBSD.org; Sat, 18 Jul 2020 13:16:07 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 248065] Linuxulator: 32-bit compat + send with MSG_NOSIGNAL Date: Sat, 18 Jul 2020 13:16:06 +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 Only Me X-Bugzilla-Who: iwtcex@gmail.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 cc attachments.mimetype 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: 2.1.33 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 18 Jul 2020 13:16:07 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248065 Bug ID: 248065 Summary: Linuxulator: 32-bit compat + send with MSG_NOSIGNAL Product: Base System Version: CURRENT Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: iwtcex@gmail.com CC: trasz@FreeBSD.org Attachment #216539 text/plain mime type: Created attachment 216539 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D216539&action= =3Dedit minimal repro Apparently, with a sufficiently large payload and the MSG_NOSIGNAL flag, blocking send turns out not quite as blocking as expected. So far this is o= nly observable with 32-bit Linux applications: % /compat/linux/usr/bin/cc -DSERVER -DCLIENT -std=3Dc99 -Wall -m32 eagain-b= ug.c -pthread -o eagain-bug % ./eagain-bug server started client started connection accepted [server] Sending 100000 bytes... [server] sent: 49032 [server] Sending 100000 bytes... [server] sent: -1 [server] send: Resource temporarily unavailable See attachment for the code. (Or grab it from https://github.com/shkhln/unexpected-eagain.) --=20 You are receiving this mail because: You are the assignee for the bug.=