From owner-freebsd-hackers@freebsd.org Mon Aug 6 01:32:02 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 15CE91065779 for ; Mon, 6 Aug 2018 01:32:02 +0000 (UTC) (envelope-from khanzf@gmail.com) Received: from mail-it0-x229.google.com (mail-it0-x229.google.com [IPv6:2607:f8b0:4001:c0b::229]) (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 AB33F80E82 for ; Mon, 6 Aug 2018 01:32:01 +0000 (UTC) (envelope-from khanzf@gmail.com) Received: by mail-it0-x229.google.com with SMTP id h23-v6so15928987ita.5 for ; Sun, 05 Aug 2018 18:32:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=6r7m/4TQe7FpTVZvG91LHkDN8pKOQ4TpsJfCRRgcVpM=; b=LAVO0DeqMOEEM3DOc7B702AVOdz39Bqb667CHEvr2rVhhq32xXGjDTnu5zw/4HaAtJ Gxcq+0G4NzHI7LU3nKGn0qpkOmIatFA1Tt8OBCtK7bcBx+2+pwfScp5ut0L7GsZg54Tv Nbuf6lYwVpGYSltUsk+2iKMojCRbwNfFOjKdtQU3B1aehyU8UPZpXa6cpWQBtaTvWPcV r6BN22960psmyiJaoCfVvtEq4u59SnjMG5RpZ4DJaSqTAMpSL83C9yIDMxaAjbd7/ICe nta6k3WMkwQKD7c0O4M5GBI26juMKtihuk0XlpgdAFjoj6+rxTG/HEVN7lTDS/0xmGPe x2dg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=6r7m/4TQe7FpTVZvG91LHkDN8pKOQ4TpsJfCRRgcVpM=; b=aIwteK4izA8Ea3HdsGCjnyJazoTP3Y9xi8nUcJVdMMI9pSRabeZGM2vc6mllWYIdFo SiPJ2LOL5y6bHbdJ5HJjzvfj+qmj+0aGcsCDeJzQG/U2PgsHVqpfrenIwx4El8+mBub4 mc06UI6rrdUVlmFnWNgQjoVHhZG3Ad1pwbYpBcgt5vw9kk7e28tq73PNT1ZbSp2Kf2YP rPJTR3CuLcDTvfk+naJhyt0BnEiPR1fWlkZJS2eYCHS7hTvwvVYuFa0hkduGRZU2nM8P boMAiFpupkFv24sa6JCuHyOG37AYc1ojZ2PZNKk8XsNoK9oiLVdrMhbTYUzX2aT/wMO2 rfjA== X-Gm-Message-State: AOUpUlHcomOmGqu9O4LLZ0rt3OAWmoCnp/0s8tYCFW01A3487zGOjVZV Sphce/dbm0Tf09d7j86jXw2d26bAvhOGisOnVuo0UfcO9aY= X-Google-Smtp-Source: AA+uWPwSXVnvmfuY+U29jwr/WYgoAT5HRAFXzAdx27rDyAUa69kzw+HN74D87crKd1YWlVK0zP1jKGeFdtm/OKEFez8= X-Received: by 2002:a24:7b8d:: with SMTP id q135-v6mr210129itc.43.1533519120596; Sun, 05 Aug 2018 18:32:00 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:ac0:8101:0:0:0:0:0 with HTTP; Sun, 5 Aug 2018 18:31:40 -0700 (PDT) From: Farhan Khan Date: Sun, 5 Aug 2018 21:31:40 -0400 Message-ID: Subject: addr2line with FreeBSD kernel failing To: freebsd-hackers@freebsd.org Content-Type: text/plain; charset="UTF-8" X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 06 Aug 2018 01:32:02 -0000 Hi all, Is there a way to go from a memory address to a kernel symbol? I am working with a subsystem that uses a lot of function pointers, and I am not certain which particular function is being called. I have dtrace(1) printing out the memory address of the function, like this: printf("Runs vap->iv_newstate: 0x%p", vap->iv_newstate); The resulting memory address will be 0xffffffff834fa6d0. I was told I can use addr2line(1), but it seems to fail, as follows: # addr2line -e /usr/obj/usr/src/amd64.amd64/sys/GENERIC/kernel.full ffffffff834fa6d0 ??:0 Am I doing something wrong? Also, if I can do this directly in dtrace(1), that would be much much better. This is definitely the installed kernel, so there is no kernel mismatch. I have also tried using kernel.debug and kernel, same result. Thank you, -- Farhan Khan PGP Fingerprint: B28D 2726 E2BC A97E 3854 5ABE 9A9F 00BC D525 16EE