Received-SPF: softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) client-ip=23.128.96.19;
Message-ID: <d4c31c67-de25-ac88-7115-4872e31f8bdf@intel.com>
Date:   Sat, 4 Jun 2022 18:14:27 +0800
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
 Firefox/91.0 Thunderbird/91.9.1
Subject: Re: [rust:rust-next 2/24] ld.lld: error:
 kernel/built-in.a(kallsyms.o):(function get_symbol_offset: .text+0x5f0):
 relocation R_RISCV_PCREL_HI20 out of range: -524435 is not in [-524288,
 524287]; references kallsyms_names
Content-Language: en-US
To:     Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
CC:     Miguel Ojeda <ojeda@kernel.org>, <kbuild-all@lists.01.org>,
        <llvm@lists.linux.dev>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <202205240321.sb0gX2mq-lkp@intel.com>
 <cdd02535-b446-5547-4fdd-6deaf3fba6a6@intel.com>
 <CANiq72k69wUZxvCeJFH3=9LsyjT76XFcfbf5aKZbb-u91wMmkQ@mail.gmail.com>
From:   Yujie Liu <yujie.liu@intel.com>
In-Reply-To: <CANiq72k69wUZxvCeJFH3=9LsyjT76XFcfbf5aKZbb-u91wMmkQ@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"; format=flowed
Content-Transfer-Encoding: 7bit
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?QlFSUXdmNXpJSGlOelBhMndyMTVsRkNLNklUMDlxVnZVbitGZmNmc0wxQkpG?=
 =?utf-8?B?cGR6dzhGWTZBL0dRWnI1cE5BUnZ5c0dVNGFSVmo5anoyQTJwSUtZT3lVdDNw?=
 =?utf-8?B?dCtpUFArUEQ4elNwQ2YvRXViTmlPcVN3cER2ZEV4ZEV5WGhISVlsSmlXODdr?=
 =?utf-8?B?VmwydzR1MUJXZVFDeC9rSzluWVlTdkVqN1NGRlByU2orMjhWMDNabzNxSmpN?=
 =?utf-8?B?UUl6NVdXWmUyVEo0RXlxWVFIZGNXRzFOVHNEN2Y0V2dKclI5aGVSVjVvQkhV?=
 =?utf-8?B?b0R3VVphNFBiUWVSQnI0WDk0MlBWTTBuM0NGVGF1ME1TZmdhTy8vNE92b0t2?=
 =?utf-8?B?YVZObkpLTHFaR0dldmQ5TVBFd3lXclRKbTFKNFhPeEsrZ04zNDhxSVorRlUr?=
 =?utf-8?B?V3JoeHVuc0VYZ05jYmpXYXdzcExhdnJxa3AxaGIrWlRxOERpbUR4b3R2RDVr?=
 =?utf-8?B?ZUxlWUtidkhoWnhPcFM5S1d6TktMV1MvMVpvNDZkWUtSMzZHSUE3R3U1dVZS?=
 =?utf-8?B?Zm14K05ER3FvaTBUWG1QbUppVmRYVyt5empsazdFUU5hVmluaWExRU1kdmk4?=
 =?utf-8?B?anNnb2pWdGgzdU10aU1zM255VUdTOEZERHNmajkrWkRTVFV2bUFKbDlZUUM2?=
 =?utf-8?B?aTMzcE42S2RSN0FVRDhHdXA0Yi9BN2ZPaGdoWmxmVStzZk5HQVJ4SHpCSFkv?=
 =?utf-8?B?Unh0NHF1TGR2Uk00eUJrVmVBT3p5L1JDTmRPTGgvdEQ5MUFWWDBFUERhN3dx?=
 =?utf-8?B?b0poWms2NWViMUxLelRra3dFbkFaMktkNFNhd1I0aHdXS3R4ODV6Y29WTDVl?=
 =?utf-8?B?MHlzNmFSVnAvdy9RVDNYL1ZvVHNjenBnQmF2WHNEV01Yd0sycDZFNXlzSzE1?=
 =?utf-8?B?clNnNWJJV1NsRDByRVVnT1gwUnpZZ200UEpHYlZoNzA2WWJmRkZzL0N0RGMy?=
 =?utf-8?B?NUFkK2c5ekE1eEtvdVpYQi9tblJLelgyUzZSK1AxVDkyQllLa0RoaVczZUVW?=
 =?utf-8?B?alU5V2wwTS93RGZ4R3dPdlJ6ZFg1RDVybCs3eVRmVTFOYWVLaW1NRS9IRTdS?=
 =?utf-8?B?WTFSazNERVcrU0xyWTVGTExWeGRCSW1mdmE1YWx5bnJyZG1oQ01KdHZQT0JF?=
 =?utf-8?B?eEdKUjBXQWRESlVrYndGek0rM2JQNGJPZnJsVldZc1QwdHhFOTdhRVVzU05w?=
 =?utf-8?B?THVsVy9ON0RlR1k3MVlQSTdDY0I1MDZhMm11YmQ1S29Rdll3czcxellrVVQr?=
 =?utf-8?B?Z0UrSnluU2lCNTZCMlB0VElCUXM0V0x6a3RFYWxSS3hQaXVHcEJTN0xMNWkw?=
 =?utf-8?B?NlBCWW9DdXdCNVBuRldIOHF0THhRWW9QQXdmVGpHdENhTnZCNUpGSnV1bGx5?=
 =?utf-8?B?ZW5MejdndmhBTVdDdlhkVnAyTG5jU2gydVgvL3M2cFZoSGZ6Y21oVVlEMVBS?=
 =?utf-8?B?LytSb2xQeUYrclUwUUo1YXRYbE1sQjJ2ZUJpVXBQbENjWEZLTE5ja1hZTVVl?=
 =?utf-8?B?cXNBQS9rRUVIUHExVVlQc0pzNm4xN01ra3ovSEM5Vmg4R0tBMHhyWnU4U0tr?=
 =?utf-8?B?RGd0eUtnYm1KK0lHb2JqbFJ3d2tVdTA0YkVQVmphNjZQWG1xcElCdjEzNjBx?=
 =?utf-8?B?MThIQm5wQkVSMUpmb1A1WnVNd2RFNXRDSHVua3ZxSDZrWjlJSGNDdXVyN2kx?=
 =?utf-8?B?Qld6R2dkaUVHR3hYTTl2NXByWU8vUUNQRHo3RVBhUjNWT2ZOQTdYcnlMWktp?=
 =?utf-8?B?SVZ0WkxKV1VDY2ZnZys0b2Nrd1JMdjhtdkJZeW5XQ0RBaUxEQ3BlT040MS9j?=
 =?utf-8?B?aWxSZ2luZE1ueE1EbnhTVk04a1oxbnJEMks1UUxFdkJrdDVXdFpEdGxIUEtn?=
 =?utf-8?B?M25oN0dVckM3YitFK2V5dzVFa3ltVEsvTG1RL3g3S3UxVkpTRGZLeWJtdlpN?=
 =?utf-8?B?VHUzY1M1RVVwTXBocURWM2hDYTdrYWxEYkRBQ0UxdXRvUTcyQVVJOHczYVBq?=
 =?utf-8?B?OXVzakV2Nitod0cwTzV3VDRQcml3SFlNTmJuRktpYWJFS0FITEN6Y0dRKzlG?=
 =?utf-8?B?UU5PUzJSOEhNVU1hUjR2VVhBejI4M0RiVVN3b1c0a0JFR1VwbXpzSTZaWnpn?=
 =?utf-8?B?cW14MWF4TTdKVFBwc05IVC9raU9WeklWb014cTZ0U25YL1A4SmVVTngydXd6?=
 =?utf-8?B?QndGV3MvWlI1eEpCSTFEQnRCSkJJWGZyK1g2YmhHVW9NU0dDbFViN2FaT21i?=
 =?utf-8?B?d25GdTlhNDUwQmpQQlZPRXY3cXJYZ3B2L1FVdW9kVTFYREQyRHRQT3V2TUZX?=
 =?utf-8?B?L1VqMk1RakFpMVBRNkxoMnhnN09BSE1Dd2J4VVlsNDdxQ1FCUE1sdz09?=
X-MS-Exchange-CrossTenant-Network-Message-Id: b7de7ecc-49bf-48bf-e2b3-08da461306cd
X-MS-Exchange-CrossTenant-AuthSource: MW4PR11MB5933.namprd11.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jun 2022 10:14:36.1635
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: qKcM3Ek0XxFyZeRnSv03yvOPqj9dvL0FjoTELxSBb+9Y1BY2ACZTzH8DSEtL6Dv+ZBrx96fdzNbADQ8xDkcFpg==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR11MB3310
X-OriginatorOrg: intel.com
X-Spam-Status: No, score=-4.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,
	DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,NICE_REPLY_A,RDNS_NONE,SPF_HELO_NONE,
	T_SCC_BODY_TEXT_LINE autolearn=unavailable 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 6/3/2022 19:01, Miguel Ojeda wrote:
> On Fri, Jun 3, 2022 at 12:32 PM kernel test robot <yujie.liu@intel.com> wrote:
>>
>>   >> ld.lld: error: kernel/built-in.a(kallsyms.o):(function get_symbol_offset: .text+0x5f0): relocation R_RISCV_PCREL_HI20 out of range: -524435 is not in [-524288, 524287]; references kallsyms_names
>>      >>> referenced by kallsyms.c
>>      >>> defined in kernel/built-in.a(kallsyms.o)
> 
> There are similar reports for the same relocation type in trees
> without Rust support merged, so this might not be being triggered by
> Rust itself, e.g.:
> 
>      https://lore.kernel.org/llvm/202206010956.rOpdU4dr-lkp@intel.com/
>      https://lore.kernel.org/llvm/202205280837.PPVZBhXr-lkp@intel.com/

Thanks for the info, it looks like an existing relocation issue in
kallsyms under riscv arch.

commit 2087d6ac3567b (kallsyms: support "big" kernel symbols) changed
some code of kallsyms to support long Rust symbols, so it exposed that
relocation issue and triggered this report.

We'll do more checks next time to ensure the reported issue is indeed
Rust related.

Thanks,
Yujie

> 
> Cheers,
> Miguel