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charset=utf-8 Content-Transfer-Encoding: quoted-printable BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev TO: cros-kernel-buildreports@googlegroups.com tree: https://android.googlesource.com/kernel/common android14-kiwi-6.1 head: 831eddf6244dd5478d58b2f2f83a856781ba030b commit: f503efe2c5da084dc5ee2db38409f7a7e4f1bc1e [38/38] drm/etnaviv: Prote= ct the scheduler's pending list with its lock :::::: branch date: 22 hours ago :::::: commit date: 9 months ago config: i386-randconfig-141-20260410 (https://download.01.org/0day-ci/archi= ve/20260411/202604110106.aMi7vRva-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f022= 7cb60147a26a1eeb4fb06e3b505e9c7261) smatch: v0.5.0-9004-gb810ac53 If you fix the issue in a separate patch/commit (i.e. not just a new versio= n of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202604110106.aMi7vRva-lkp@intel.com/ smatch warnings: drivers/gpu/drm/etnaviv/etnaviv_sched.c:66 etnaviv_sched_timedout_job() war= n: variable dereferenced before check 'sched_job' (see line 37) vim +/sched_job +66 drivers/gpu/drm/etnaviv/etnaviv_sched.c e93b6deeb45a78 Lucas Stach 2017-12-04 32 =20 a6a1f036c74e3d Luben Tuikov 2021-01-20 33 static enum drm_gpu_sched_= stat etnaviv_sched_timedout_job(struct drm_sched_job a6a1f036c74e3d Luben Tuikov 2021-01-20 34 *sched_job) e93b6deeb45a78 Lucas Stach 2017-12-04 35 { 6d7a20c0776036 Lucas Stach 2017-12-06 36 struct etnaviv_gem_submit= *submit =3D to_etnaviv_submit(sched_job); f503efe2c5da08 Ma=C3=ADra Canal 2025-06-02 @37 struct drm_gpu_sched= uler *sched =3D sched_job->sched; 6d7a20c0776036 Lucas Stach 2017-12-06 38 struct etnaviv_gpu *gpu = =3D submit->gpu; 2c83a726d6fbb5 Lucas Stach 2018-06-27 39 u32 dma_addr; 2c83a726d6fbb5 Lucas Stach 2018-06-27 40 int change; 2c83a726d6fbb5 Lucas Stach 2018-06-27 41 =20 2c83a726d6fbb5 Lucas Stach 2018-06-27 42 /* 2c83a726d6fbb5 Lucas Stach 2018-06-27 43 * If the GPU managed to = complete this jobs fence, the timout is 2c83a726d6fbb5 Lucas Stach 2018-06-27 44 * spurious. Bail out. 2c83a726d6fbb5 Lucas Stach 2018-06-27 45 */ 6fce3a406108ee Lucas Stach 2018-10-04 46 if (dma_fence_is_signaled= (submit->out_fence)) 50248a3ec0f5e5 Lucas Stach 2020-08-24 47 goto out_no_timeout; 2c83a726d6fbb5 Lucas Stach 2018-06-27 48 =20 2c83a726d6fbb5 Lucas Stach 2018-06-27 49 /* 2c83a726d6fbb5 Lucas Stach 2018-06-27 50 * If the GPU is still ma= king forward progress on the front-end (which 2c83a726d6fbb5 Lucas Stach 2018-06-27 51 * should never loop) we = shift out the timeout to give it a chance to 2c83a726d6fbb5 Lucas Stach 2018-06-27 52 * finish the job. 2c83a726d6fbb5 Lucas Stach 2018-06-27 53 */ 2c83a726d6fbb5 Lucas Stach 2018-06-27 54 dma_addr =3D gpu_read(gpu= , VIVS_FE_DMA_ADDRESS); 2c83a726d6fbb5 Lucas Stach 2018-06-27 55 change =3D dma_addr - gpu= ->hangcheck_dma_addr; cdd156955f946b Lucas Stach 2021-12-22 56 if (gpu->completed_fence = !=3D gpu->hangcheck_fence || cdd156955f946b Lucas Stach 2021-12-22 57 change < 0 || change = > 16) { 2c83a726d6fbb5 Lucas Stach 2018-06-27 58 gpu->hangcheck_dma_addr = =3D dma_addr; cdd156955f946b Lucas Stach 2021-12-22 59 gpu->hangcheck_fence =3D = gpu->completed_fence; 50248a3ec0f5e5 Lucas Stach 2020-08-24 60 goto out_no_timeout; 2c83a726d6fbb5 Lucas Stach 2018-06-27 61 } 6d7a20c0776036 Lucas Stach 2017-12-06 62 =20 2dd415c2e34c5a Lucas Stach 2024-06-21 63 /* block scheduler */ 2dd415c2e34c5a Lucas Stach 2024-06-21 64 drm_sched_stop(&gpu->sche= d, sched_job); 2dd415c2e34c5a Lucas Stach 2024-06-21 65 =20 222b5f04415987 Andrey Grodzovsky 2018-12-04 @66 if(sched_job) 222b5f04415987 Andrey Grodzovsky 2018-12-04 67 drm_sched_increase_karma= (sched_job); 6d7a20c0776036 Lucas Stach 2017-12-06 68 =20 6d7a20c0776036 Lucas Stach 2017-12-06 69 /* get the GPU back into = the init state */ 9a1fdae5876016 Lucas Stach 2019-08-09 70 etnaviv_core_dump(submit); 6d7a20c0776036 Lucas Stach 2017-12-06 71 etnaviv_gpu_recover_hang(= gpu); 6d7a20c0776036 Lucas Stach 2017-12-06 72 =20 222b5f04415987 Andrey Grodzovsky 2018-12-04 73 drm_sched_resubmit_jobs(&= gpu->sched); 222b5f04415987 Andrey Grodzovsky 2018-12-04 74 =20 a6a1f036c74e3d Luben Tuikov 2021-01-20 75 drm_sched_start(&gpu->sch= ed, true); a6a1f036c74e3d Luben Tuikov 2021-01-20 76 return DRM_GPU_SCHED_STAT= _NOMINAL; a6a1f036c74e3d Luben Tuikov 2021-01-20 77 =20 50248a3ec0f5e5 Lucas Stach 2020-08-24 78 out_no_timeout: f503efe2c5da08 Ma=C3=ADra Canal 2025-06-02 79 spin_lock(&sched->jo= b_list_lock); f503efe2c5da08 Ma=C3=ADra Canal 2025-06-02 80 list_add(&sched_job-= >list, &sched->pending_list); f503efe2c5da08 Ma=C3=ADra Canal 2025-06-02 81 spin_unlock(&sched->= job_list_lock); a6a1f036c74e3d Luben Tuikov 2021-01-20 82 return DRM_GPU_SCHED_STAT= _NOMINAL; e93b6deeb45a78 Lucas Stach 2017-12-04 83 } e93b6deeb45a78 Lucas Stach 2017-12-04 84 =20 :::::: The code at line 66 was first introduced by commit :::::: 222b5f044159877504dbac9bc1910f89a74136e2 drm/sched: Refactor ring mi= rror list handling. :::::: TO: Andrey Grodzovsky :::::: CC: Alex Deucher --=20 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f43.google.com (mail-wm1-f43.google.com [209.85.128.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E4003DA7CF for ; 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Fri, 10 Apr 2026 11:05:43 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488d538c03esm89763415e9.13.2026.04.10.11.05.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Apr 2026 11:05:43 -0700 (PDT) Date: Fri, 10 Apr 2026 21:05:39 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, cros-kernel-buildreports@googlegroups.com Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev Subject: [android-common:android14-kiwi-6.1 38/38] drivers/gpu/drm/etnaviv/etnaviv_sched.c:66 etnaviv_sched_timedout_job() warn: variable dereferenced before check 'sched_job' (see line 37) Message-ID: <202604110106.aMi7vRva-lkp@intel.com> Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit Message-ID: <20260410180539.l0kIhLoIErDG0klS_ysdPAEi_baOuLFs5QJcIQ3ozUE@z> tree: https://android.googlesource.com/kernel/common android14-kiwi-6.1 head: 831eddf6244dd5478d58b2f2f83a856781ba030b commit: f503efe2c5da084dc5ee2db38409f7a7e4f1bc1e [38/38] drm/etnaviv: Protect the scheduler's pending list with its lock config: i386-randconfig-141-20260410 (https://download.01.org/0day-ci/archive/20260411/202604110106.aMi7vRva-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) smatch: v0.5.0-9004-gb810ac53 If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202604110106.aMi7vRva-lkp@intel.com/ smatch warnings: drivers/gpu/drm/etnaviv/etnaviv_sched.c:66 etnaviv_sched_timedout_job() warn: variable dereferenced before check 'sched_job' (see line 37) vim +/sched_job +66 drivers/gpu/drm/etnaviv/etnaviv_sched.c e93b6deeb45a78 Lucas Stach 2017-12-04 32 a6a1f036c74e3d Luben Tuikov 2021-01-20 33 static enum drm_gpu_sched_stat etnaviv_sched_timedout_job(struct drm_sched_job a6a1f036c74e3d Luben Tuikov 2021-01-20 34 *sched_job) e93b6deeb45a78 Lucas Stach 2017-12-04 35 { 6d7a20c0776036 Lucas Stach 2017-12-06 36 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job); f503efe2c5da08 Maíra Canal 2025-06-02 @37 struct drm_gpu_scheduler *sched = sched_job->sched; ^^^^^^^^^^^^^^^^ Dereferenced. 6d7a20c0776036 Lucas Stach 2017-12-06 38 struct etnaviv_gpu *gpu = submit->gpu; 2c83a726d6fbb5 Lucas Stach 2018-06-27 39 u32 dma_addr; 2c83a726d6fbb5 Lucas Stach 2018-06-27 40 int change; 2c83a726d6fbb5 Lucas Stach 2018-06-27 41 2c83a726d6fbb5 Lucas Stach 2018-06-27 42 /* 2c83a726d6fbb5 Lucas Stach 2018-06-27 43 * If the GPU managed to complete this jobs fence, the timout is 2c83a726d6fbb5 Lucas Stach 2018-06-27 44 * spurious. Bail out. 2c83a726d6fbb5 Lucas Stach 2018-06-27 45 */ 6fce3a406108ee Lucas Stach 2018-10-04 46 if (dma_fence_is_signaled(submit->out_fence)) 50248a3ec0f5e5 Lucas Stach 2020-08-24 47 goto out_no_timeout; 2c83a726d6fbb5 Lucas Stach 2018-06-27 48 2c83a726d6fbb5 Lucas Stach 2018-06-27 49 /* 2c83a726d6fbb5 Lucas Stach 2018-06-27 50 * If the GPU is still making forward progress on the front-end (which 2c83a726d6fbb5 Lucas Stach 2018-06-27 51 * should never loop) we shift out the timeout to give it a chance to 2c83a726d6fbb5 Lucas Stach 2018-06-27 52 * finish the job. 2c83a726d6fbb5 Lucas Stach 2018-06-27 53 */ 2c83a726d6fbb5 Lucas Stach 2018-06-27 54 dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS); 2c83a726d6fbb5 Lucas Stach 2018-06-27 55 change = dma_addr - gpu->hangcheck_dma_addr; cdd156955f946b Lucas Stach 2021-12-22 56 if (gpu->completed_fence != gpu->hangcheck_fence || cdd156955f946b Lucas Stach 2021-12-22 57 change < 0 || change > 16) { 2c83a726d6fbb5 Lucas Stach 2018-06-27 58 gpu->hangcheck_dma_addr = dma_addr; cdd156955f946b Lucas Stach 2021-12-22 59 gpu->hangcheck_fence = gpu->completed_fence; 50248a3ec0f5e5 Lucas Stach 2020-08-24 60 goto out_no_timeout; 2c83a726d6fbb5 Lucas Stach 2018-06-27 61 } 6d7a20c0776036 Lucas Stach 2017-12-06 62 2dd415c2e34c5a Lucas Stach 2024-06-21 63 /* block scheduler */ 2dd415c2e34c5a Lucas Stach 2024-06-21 64 drm_sched_stop(&gpu->sched, sched_job); 2dd415c2e34c5a Lucas Stach 2024-06-21 65 222b5f04415987 Andrey Grodzovsky 2018-12-04 @66 if(sched_job) ^^^^^^^^^ Checked too late. Probably just delete this check. 222b5f04415987 Andrey Grodzovsky 2018-12-04 67 drm_sched_increase_karma(sched_job); 6d7a20c0776036 Lucas Stach 2017-12-06 68 6d7a20c0776036 Lucas Stach 2017-12-06 69 /* get the GPU back into the init state */ 9a1fdae5876016 Lucas Stach 2019-08-09 70 etnaviv_core_dump(submit); 6d7a20c0776036 Lucas Stach 2017-12-06 71 etnaviv_gpu_recover_hang(gpu); 6d7a20c0776036 Lucas Stach 2017-12-06 72 222b5f04415987 Andrey Grodzovsky 2018-12-04 73 drm_sched_resubmit_jobs(&gpu->sched); 222b5f04415987 Andrey Grodzovsky 2018-12-04 74 a6a1f036c74e3d Luben Tuikov 2021-01-20 75 drm_sched_start(&gpu->sched, true); a6a1f036c74e3d Luben Tuikov 2021-01-20 76 return DRM_GPU_SCHED_STAT_NOMINAL; a6a1f036c74e3d Luben Tuikov 2021-01-20 77 50248a3ec0f5e5 Lucas Stach 2020-08-24 78 out_no_timeout: f503efe2c5da08 Maíra Canal 2025-06-02 79 spin_lock(&sched->job_list_lock); f503efe2c5da08 Maíra Canal 2025-06-02 80 list_add(&sched_job->list, &sched->pending_list); f503efe2c5da08 Maíra Canal 2025-06-02 81 spin_unlock(&sched->job_list_lock); a6a1f036c74e3d Luben Tuikov 2021-01-20 82 return DRM_GPU_SCHED_STAT_NOMINAL; e93b6deeb45a78 Lucas Stach 2017-12-04 83 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki