From owner-freebsd-hackers@freebsd.org Wed Oct 24 15:48:54 2018 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 5FE2DFF1AA2 for ; Wed, 24 Oct 2018 15:48:54 +0000 (UTC) (envelope-from rysto32@gmail.com) Received: from mail-lf1-x136.google.com (mail-lf1-x136.google.com [IPv6:2a00:1450:4864:20::136]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id BF4376A80B; Wed, 24 Oct 2018 15:48:53 +0000 (UTC) (envelope-from rysto32@gmail.com) Received: by mail-lf1-x136.google.com with SMTP id n3-v6so4363199lfe.7; Wed, 24 Oct 2018 08:48:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=TiUMubkGlefpV52oJ2EoKnW/OllSXGqnYX9pmmBDUAA=; b=EYDlh1KeMSwdSGI5GURFf6fc3844DIwFBoMpK1zlhQQNYvFvt/xHm1CPP4KsaXktgN GFZKyU4byzfKRVD81XnKnyYbuU4xb13JGCkngJaso1GliErNctdE38UwN+OyDuoOPi26 KkW6UWk7315j6MzrzZ/wGyCwaVNlPNesRVyYzWUg70647CeFifj6I1kjtJhKX6tDTtVN rHItqQPzbRuAp6W9W+Fm/jv/SmV6aU0CSf5ExVinp28IUpZHxmvNx5U0RZ3OiYwtALin 9LQdJLBi6Bol9FRcCBMoTYHiGFj+CT0cjTrZR+LOqmr3UhZDcXFDgnhVndsvvijCL2/T k3mg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=TiUMubkGlefpV52oJ2EoKnW/OllSXGqnYX9pmmBDUAA=; b=DICC3yTDIUoYnYUcFarhTj+LTbkse/4h4PyubKxn5oNGCcX9F+ITKqGHBRuo5/4c8t +lyQv71O3kzIx38w5GwfqJXfmnZneMX8Mq3Ofhlz+jgwOAxIUxNfXwNHHj7eQRYiLtUb wvWYhgNEwoVDTIzqT8pAhXXXHVfsJiBenIyIiDrcKmKI8H1LKmJ/1P9KGHEbIRnzWgOs m7+aTAHDS/1cksSx2XXd4gVM1ChuzT1hIFScz2fnxpjortyFY1xs7caewgWs8V0yJMIg td01+4j9nXtXcI+DTqsZueJtULMAky6k93BT5mXWuo+jEkoamm6Boydd3UPEpVFV+r7W svpg== X-Gm-Message-State: ABuFfogyXf5ZU4Z+GdtBAFuNj6DJM68nZNc0ljF9EqGKvpbJw+JsAztN VfAqu2DbTCTJESpyGxG5IYlG2tGSimCSlKH/3NVbDYUC X-Google-Smtp-Source: ACcGV63pkb+MEhwUR22j1jyPcyB+VEbsfXSp9ejohZES8HZcLOmDu2gZP/syN73I0wt8Hoh6XQisYwTUlKvkB5Q8jJA= X-Received: by 2002:ac2:434d:: with SMTP id o13-v6mr15910372lfl.129.1540396132003; Wed, 24 Oct 2018 08:48:52 -0700 (PDT) MIME-Version: 1.0 References: <170994671.20181021201021@serebryakov.spb.ru> <475670271.20181022003734@serebryakov.spb.ru> <234d745d-37a9-9610-15b9-0f5cd5af21bf@FreeBSD.org> <168122586.20181024003412@serebryakov.spb.ru> In-Reply-To: <168122586.20181024003412@serebryakov.spb.ru> From: Ryan Stone Date: Wed, 24 Oct 2018 11:48:40 -0400 Message-ID: Subject: Re: What is wrong with dtrace's stack()? To: lev@freebsd.org Cc: freebsd-hackers@freebsd.org, Conrad Meyer , Alan Somers Content-Type: text/plain; charset="UTF-8" X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Oct 2018 15:48:54 -0000 sosend_generic+0x112c is the return address, so it's one instruction after the call instruction that called lock_delay. What's the line number of sosend_generic+0x112b? On Tue, Oct 23, 2018 at 5:34 PM Lev Serebryakov wrote: > > Hello Ryan, > > Monday, October 22, 2018, 11:50:29 PM, you wrote: > > > Adding -fno-optimize-sibling-calls to the compiler flags will eliminate the TCO. > Stacks are better but still strange. For example I have such stack (which I > like better than previous): > > kernel`lock_delay+0x72 > kernel`sosend_generic+0x112c > kernel`sosend+0x79 > kernel`soo_write+0x6b > kernel`fo_write+0x4a > kernel`dofilewrite+0xcd > kernel`kern_writev+0x79 > kernel`sys_write+0x8f > kernel`syscallenter+0x774 > kernel`amd64_syscall+0x1b > kernel`0xffffffff80cebf6d > > According to addr2line `sosend_generic+0x112c' is > > https://svnweb.freebsd.org/base/head/sys/kern/uipc_socket.c?revision=339419&view=markup#l1579 > > Which is call to protocol-specific send function. Where is this function > (it should be tcp for sure)?! > > -- > Best regards, > Lev mailto:lev@FreeBSD.org >