Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Chuck Lever III <chuck.lever@oracle.com>
To:     Steven Rostedt <rostedt@goodmis.org>
CC:     LKML <linux-kernel@vger.kernel.org>
Subject: Re: possible trace_printk() bug in v5.19-rc1
Thread-Topic: possible trace_printk() bug in v5.19-rc1
Thread-Index: AQHYgZTiaV2APa8LiECz6bYrBgXq161SKdYAgAAAwoCAAAH0AIAAKEUA
Date:   Thu, 16 Jun 2022 18:07:51 +0000
Message-ID: <88ADA44D-E457-4DA4-BD65-73F583217363@oracle.com>
References: <F6C267B0-83EA-4151-A4EC-44482AC52C59@oracle.com>
 <20220616113400.15335d91@gandalf.local.home>
 <E309A098-DA06-490D-A75C-E6295C2987B9@oracle.com>
 <20220616114342.3aba84ac@gandalf.local.home>
In-Reply-To: <20220616114342.3aba84ac@gandalf.local.home>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?us-ascii?Q?zBhU16XwBjS4kVVnFYbKniBmhnx7vMF5PJBdhW+zXODudNxKmR1vkpC75TAg?=
 =?us-ascii?Q?tfVVM1Df3+VcqQSSU2hPB3QFLK8Ri1JwrT+aTEk9x+MZV1d2gRDRB6YvVll4?=
 =?us-ascii?Q?3jyFqhd0X40mxm5M3Du2rqLJNyiWUFXrYIpHpYA9HnygrGq7W2mH/XAuaELD?=
 =?us-ascii?Q?KCRdUnb4dsVgrf4dR2kjwEZTbT4DYI3k5zpQNfkwjQYHe02pjeFJ7s/XzKo0?=
 =?us-ascii?Q?ZbsL2aNT1ne5485yXi89EJOdnEZxmsVwi5NoVytMTmrKfE+YktMLmQg1tfY1?=
 =?us-ascii?Q?rK6Hikj3Tg994mMpcnWznh0YI8yJjKBB59lNtgdaW8bGu6fspU2tWGvgOLqM?=
 =?us-ascii?Q?B/BGvvp+cZ9Tj0U1r+VM3uPEI8danZeQ81DEaQGf6yHRM6q8/zIeyxRGvkgm?=
 =?us-ascii?Q?8EnA/CzUBe097wWCyi/bjtD9tk/71SICRehKs36ZjWytmX8qKYRhGHd1wkQd?=
 =?us-ascii?Q?IfMwwEh6dAdKXuK7hV/dGpxDL+HDlGnlqfGElawF6ul50UnVCWIH5AXsQqVF?=
 =?us-ascii?Q?J3ZKqBpA2fMfkC6qjbQpNzZxjVkSAXFrnYre2dpMajo0OVQkyYrRyIae1TC/?=
 =?us-ascii?Q?X64ZAqz2Q2/1RNypp0AwGvZdXphnz7g9zutSD3jetibapJd2EXbTpt7CIkRR?=
 =?us-ascii?Q?OZmTtwk25jJJW5BNRXOQFZt7j1yjazCeSMN5k4FQN/dvQP+iaZs+8eN0IZ5M?=
 =?us-ascii?Q?XsGf5kTGZFs34i18Zd4vXhe6mxKCjRGmRwvFORp6ziC/JDGlRqXy+nRBOkr2?=
 =?us-ascii?Q?LCvOYj0Dz6yqrC8pvjiFgOipX/Zco6z0Yip/1CPKsJaDerNP3xBNUPPKLJWA?=
 =?us-ascii?Q?SG1zA49i59beiqVhorP80nkpM2xTKYA1KXVpJrTTK4ealm4Q+nJUffA0pMA1?=
 =?us-ascii?Q?0N767xGJzdyp5Q6WbXydov2C1u4EbRc2WnIIdZvUOdfgMOfRvttvLngLeXOy?=
 =?us-ascii?Q?/y7rk/Hlnvz1efrU7HSvJCw5KVM79UM1E0SrOsKfc8ya4RGkMvVvasxEWjiJ?=
 =?us-ascii?Q?b6cwTR9cyWoJGE200FbfCb9HhODOP6DLVoofptTwh6qjy5vippSoTw2F9w26?=
 =?us-ascii?Q?hqi7pjeK2XNVEEi2lgdsQr0OjKvhPxx+J8BOyknhT4ux+/GXlgFR0LglYvKU?=
 =?us-ascii?Q?Qn7OK5tzvvx7YHdcoM3y8ujWr9oEx//Zjm8J/FM9GmQRFT+yO7onx0HSwl/R?=
 =?us-ascii?Q?WVk9Mya+XHm0II+1gQPT29mqwsPw4mxBx3ZxfhjHv1/z9Sk0nmxRYvRJQMPB?=
 =?us-ascii?Q?sQi13GXamMDU4OeynrqDelivXdnSekPUtimmu1k8a1V6qP5/S8LPiLCyARnb?=
 =?us-ascii?Q?qZf8OUCgfZj7IebdxLzh58cY6MsGu6q/RBgJuMQ9RqcPeFXE3F4hQyQgrACQ?=
 =?us-ascii?Q?TQHfoIWIYVxTp0sCSrQWGrQ6sWZYZbGHj1onB7Sji9daO+i/l1oa7KbKkplU?=
 =?us-ascii?Q?wzHsl/nQvQke0z8lkpvllXiZS6bxk8SLbLsZgEqSqjuV8Y21OldyV63CTPv7?=
 =?us-ascii?Q?yx/L6FbmC2XpDbhwR7cHtHBrYIEpAz1QXzD4NLHi99EzsSHkdOYSIEpOOTGJ?=
 =?us-ascii?Q?QzziFZJfKkrSBXxRGWMSkmT5jboT+wpyRVkOh54pVEeJvy4kBZSOnrVF6FMo?=
 =?us-ascii?Q?riTU/j9HVaq2wfryC7tmNYcw6z7UEdAYi6aKhUm6b/QsLtzY1Wg81ZNVpv32?=
 =?us-ascii?Q?UgNw3AJKPgBkbNL3uIpb8sY03ONRJmlaGq3PTn1LTyXvRfSi4bzdJ7MMrU2J?=
 =?us-ascii?Q?CfTq138uJ5GC+fDt70TrqMeClrbNDMg=3D?=
Content-Type: text/plain; charset="us-ascii"
Content-ID: <4922D1FDF9C2364DA4EC49422B55146B@namprd10.prod.outlook.com>
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-OriginatorOrg: oracle.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: BN0PR10MB5128.namprd10.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: deb54420-1aa2-4f47-0a65-08da4fc320a5
X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Jun 2022 18:07:51.0625
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: NMCZNXUuSyvS/olTMrQOeYygnZ3vZ1lnFXrvZYiFruABtEOHzrRsO5qc0qDaVyussav1YwviqqdWjsFpMJv+TQ==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR10MB1693
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.517,18.0.883
 definitions=2022-06-16_14:2022-06-16,2022-06-16 signatures=0
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxlogscore=999
 bulkscore=0 spamscore=0 phishscore=0 adultscore=0 suspectscore=0
 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1
 engine=8.12.0-2204290000 definitions=main-2206160073
X-Proofpoint-GUID: F2QYPYwTYUSYPhFWpZ7IByAX437X44Ou
X-Proofpoint-ORIG-GUID: F2QYPYwTYUSYPhFWpZ7IByAX437X44Ou
X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW,
        RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE
        autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org


> On Jun 16, 2022, at 11:43 AM, Steven Rostedt <rostedt@goodmis.org> wrote:
>=20
> On Thu, 16 Jun 2022 15:36:43 +0000
> Chuck Lever III <chuck.lever@oracle.com> wrote:
>=20
>> I haven't explicitly removed nfsd.ko, and lsmod says it's still there.
>> And, trace_printk was working as expected on v5.18.
>=20
> If you were to add a printk() with the same format in the same location,
> does it work?
>=20
> That is:
>=20
> 	printk("%pS still here\n", __func__);

Sorry for the delay; lunch was mandatory-to-implement.

This code:

	pr_info("%pS\n", (void *)_THIS_IP_);

generates:

Jun 16 14:05:53 klimt.1015granger.net kernel: nfsd_file_slab_free+0xb6/0x10=
a [nfsd]

--
Chuck Lever