From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from simark.ca by simark.ca with LMTP id 8saoC6WiNGL6EwAAWB0awg (envelope-from ) for ; Fri, 18 Mar 2022 11:17:57 -0400 Received: by simark.ca (Postfix, from userid 112) id 191CF1F3CC; Fri, 18 Mar 2022 11:17:57 -0400 (EDT) X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on simark.ca X-Spam-Level: X-Spam-Status: No, score=-3.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.2 Received: from lists.lttng.org (lists.lttng.org [167.114.26.123]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by simark.ca (Postfix) with ESMTPS id 95AB21EDF0 for ; Fri, 18 Mar 2022 11:17:56 -0400 (EDT) Received: from lists-lttng01.efficios.com (localhost [IPv6:::1]) by lists.lttng.org (Postfix) with ESMTP id 4KKnh40tHbzG9y; Fri, 18 Mar 2022 11:17:56 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=lists.lttng.org; s=default; t=1647616676; bh=ygRK5tuH3P18fFaBdD5kwW7uHm4dRKrSe7J4YP3Ezjg=; h=To:Cc:Date:In-Reply-To:References:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From:Reply-To:From; b=aWyKAArdqAfnADEAVofHqNheQN7OYyrMoTJgwy8K9fNbAbdQHap/5A9rQcrXSAJ1H 4lhSttNOQB8m+EWwpkYgckr7c9SFuBbFAmCvgVm/9Ls7pDk76dcmeistlvs6b4gzTQ a8onTQB6Ls5v0oy4PVXnbHGpe2cbZ4BoOg1pv2xKXq/PImr1YQSSAC7xYtc0KYbZJq iNxqtPoV0911v1wxn7AOjWDTGo+CGoIMzEjSHDr9B1/lnsOK6Cr2ti/vcB4kJFxadS Ibab5mJhcegRzOtDm33uQgHIsX7GO63GL87fQaMjHS2nj6yXxMYEksBxcGf+HrrJOF kL1lOyT6oPIUw== Received: from mail.kdab.com (mail.kdab.com [176.9.126.58]) by lists.lttng.org (Postfix) with ESMTPS id 4KKnh26wZczG0L for ; Fri, 18 Mar 2022 11:17:49 -0400 (EDT) X-Virus-Scanned: amavisd-new at kdab.com To: Mathieu Desnoyers Cc: lttng-dev Date: Fri, 18 Mar 2022 16:17:37 +0100 Message-ID: <2277326.HLNEk0qn7D@milian-workstation> Organization: KDAB In-Reply-To: <881325190.163218.1647615600126.JavaMail.zimbra@efficios.com> References: <5884867.lOV4Wx5bFT@agathemoarbauer> <881325190.163218.1647615600126.JavaMail.zimbra@efficios.com> MIME-Version: 1.0 Subject: Re: [lttng-dev] getting lttng-modules to work on archlinux? X-BeenThere: lttng-dev@lists.lttng.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: LTTng development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Milian Wolff via lttng-dev Reply-To: Milian Wolff Content-Type: multipart/mixed; boundary="===============0615928942206285345==" Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" --===============0615928942206285345== Content-Type: multipart/signed; boundary="nextPart1694949.AOmfBYOYmx"; micalg="sha256"; protocol="application/pkcs7-signature" --nextPart1694949.AOmfBYOYmx Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1" On Freitag, 18. M=E4rz 2022 16:00:00 CET Mathieu Desnoyers wrote: > ----- On Mar 18, 2022, at 10:34 AM, lttng-dev lttng-dev@lists.lttng.org=20 wrote: > > Hey all, > >=20 > > in the past lttng-modules used to work on archlinux. But with a current > > kernel, I cannot get it to work anymore. Has anyone an idea what is goi= ng > > on here? > >=20 > > I compiled and installed lttng-modules from the latest git, which works > > fine. > >=20 > > ``` > >=20 > > make > > sudo make modules_install > > sudo depmod -a > >=20 > > ``` > >=20 > > But loading the kernel modules then fails like this: > >=20 > > ``` > > lttng-sessiond > > Error: Unable to load required module lttng-ring-buffer-client-discard > > Warning: No kernel tracer available > > ``` > >=20 > > In dmesg I see the following output then, and I wonder if I'm doing > > something obviously wrong? > >=20 > > ``` > > [16245.772646] Spectre V2 : System may be vulnerable to spectre v2 > > [16245.772653] lttng_uprobes: loading module not compiled with retpoline > > compiler. >=20 > Hi Milian, Hey Mathieu! > I suspect you need to use the same compiler (a compiler that supports > retpoline Spectre v2 mitigation) to compile lttng-modules as was used to > compile your kernel. >=20 > I suspect the kernel rejects those modules because they are compiled with= a > different compiler than your Linux kernel. Indeed, that seems to have been it. I wasn't deliberately using a different= =20 compiler (normal system GCC) but something seems to have influenced it. Usi= ng=20 a clean environment without any of my normal overwrites has fixed the issue= =20 and now it works as expected. Thanks for making me try this once more! Cheers =2D-=20 Milian Wolff | milian.wolff@kdab.com | Senior Software Engineer KDAB (Deutschland) GmbH, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt, C++ and OpenGL Experts --nextPart1694949.AOmfBYOYmx Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEekw ggWBMIIEaaADAgECAhA5ckQ6+SK3UdfTbBDdMTWVMA0GCSqGSIb3DQEBDAUAMHsxCzAJBgNVBAYT AkdCMRswGQYDVQQIDBJHcmVhdGVyIE1hbmNoZXN0ZXIxEDAOBgNVBAcMB1NhbGZvcmQxGjAYBgNV BAoMEUNvbW9kbyBDQSBMaW1pdGVkMSEwHwYDVQQDDBhBQUEgQ2VydGlmaWNhdGUgU2VydmljZXMw HhcNMTkwMzEyMDAwMDAwWhcNMjgxMjMxMjM1OTU5WjCBiDELMAkGA1UEBhMCVVMxEzARBgNVBAgT Ck5ldyBKZXJzZXkxFDASBgNVBAcTC0plcnNleSBDaXR5MR4wHAYDVQQKExVUaGUgVVNFUlRSVVNU IE5ldHdvcmsxLjAsBgNVBAMTJVVTRVJUcnVzdCBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkw ggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQCAEmUXNg7D2wiz0KxXDXbtzSfTTK1Qg2Hi 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