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Thu, 4 Mar 2021 07:51:16 +0000 Subject: Re: drm/ttm: ttm_bo_release called without lock To: Thomas Zimmermann , Petr Mladek Cc: David Airlie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Huang Rui , Dave Airlie , Gerd Hoffmann References: From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <98bbfb1e-c3b2-a8dc-518f-ecb9fa55b4da@amd.com> Date: Thu, 4 Mar 2021 08:51:10 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Originating-IP: [2a02:908:1252:fb60:64f0:29b:e922:7ee4] X-ClientProxiedBy: FRYP281CA0015.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10::25) To MN2PR12MB3775.namprd12.prod.outlook.com (2603:10b6:208:159::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2a02:908:1252:fb60:64f0:29b:e922:7ee4] (2a02:908:1252:fb60:64f0:29b:e922:7ee4) by FRYP281CA0015.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3933.14 via Frontend Transport; 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Christian. Am 04.03.21 um 08:42 schrieb Thomas Zimmermann: > (cc'ing Gerd) > > This might be related to the recent clean-up patches for the BO > handling in qxl. > > Am 03.03.21 um 16:07 schrieb Petr Mladek: >> On Wed 2021-03-03 15:34:09, Petr Mladek wrote: >>> Hi, >>> >>> the following warning is filling my kernel log buffer >>> with 5.12-rc1+ kernels: >>> >>> [  941.070598] WARNING: CPU: 0 PID: 11 at >>> drivers/gpu/drm/ttm/ttm_bo.c:139 ttm_bo_move_to_lru_tail+0x1ba/0x210 >>> [  941.070601] Modules linked in: >>> [  941.070603] CPU: 0 PID: 11 Comm: kworker/0:1 Kdump: loaded >>> Tainted: G        W         5.12.0-rc1-default+ #81 >>> [  941.070605] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), >>> BIOS rel-1.12.0-59-gc9ba527-rebuilt.opensuse.org 04/01/2014 >>> [  941.070606] Workqueue: events qxl_gc_work >>> [  941.070609] RIP: 0010:ttm_bo_move_to_lru_tail+0x1ba/0x210 >>> [  941.070610] Code: 93 e8 02 00 00 48 89 0a e9 00 ff ff ff 48 8b 87 >>> 38 01 00 00 be ff ff ff ff 48 8d 78 70 e8 8e 7d 46 00 85 c0 0f 85 6f >>> fe ff ff <0f> 0b 8b 93 fc 02 00 00 85 d2 0f 84 6d fe ff ff 48 89 df >>> 5b 5d 41 >>> [  941.070612] RSP: 0018:ffffbddf4008fd38 EFLAGS: 00010246 >>> [  941.070614] RAX: 0000000000000000 RBX: ffff95ae485bac00 RCX: >>> 0000000000000002 >>> [  941.070615] RDX: 0000000000000000 RSI: ffff95ae485badb0 RDI: >>> ffff95ae40305108 >>> [  941.070616] RBP: 0000000000000000 R08: 0000000000000001 R09: >>> 0000000000000001 >>> [  941.070617] R10: ffffbddf4008fc10 R11: ffffffffa5401580 R12: >>> ffff95ae42a94e90 >>> [  941.070618] R13: ffff95ae485bae70 R14: ffff95ae485bac00 R15: >>> ffff95ae455d1800 >>> [  941.070620] FS:  0000000000000000(0000) GS:ffff95aebf600000(0000) >>> knlGS:0000000000000000 >>> [  941.070621] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> [  941.070622] CR2: 00007f8ffb2f8000 CR3: 0000000102c5e005 CR4: >>> 0000000000370ef0 >>> [  941.070624] DR0: 0000000000000000 DR1: 0000000000000000 DR2: >>> 0000000000000000 >>> [  941.070626] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: >>> 0000000000000400 >>> [  941.070627] Call Trace: >>> [  941.070630]  ttm_bo_release+0x551/0x600 >>> [  941.070635]  qxl_bo_unref+0x3a/0x50 >>> [  941.070638]  qxl_release_free_list+0x62/0xc0 >>> [  941.070643]  qxl_release_free+0x76/0xe0 >>> [  941.070646]  qxl_garbage_collect+0xd9/0x190 >>> [  941.080241]  process_one_work+0x2b0/0x630 >>> [  941.080249]  ? process_one_work+0x630/0x630 >>> [  941.080251]  worker_thread+0x39/0x3f0 >>> [  941.080255]  ? process_one_work+0x630/0x630 >>> [  941.080257]  kthread+0x13a/0x150 >>> [  941.080260]  ? kthread_create_worker_on_cpu+0x70/0x70 >>> [  941.080265]  ret_from_fork+0x1f/0x30 >>> [  941.080277] irq event stamp: 757191 >>> [  941.080278] hardirqs last  enabled at (757197): >>> [] vprintk_emit+0x27f/0x2c0 >>> [  941.080280] hardirqs last disabled at (757202): >>> [] vprintk_emit+0x23c/0x2c0 >>> [  941.080281] softirqs last  enabled at (755768): >>> [] __do_softirq+0x30f/0x432 >>> [  941.080284] softirqs last disabled at (755763): >>> [] irq_exit_rcu+0xea/0xf0 >> >> I have just realized that it actually prints two warnings over and >> over again. The 2nd one is: >> >> [  186.078790] WARNING: CPU: 0 PID: 146 at >> drivers/gpu/drm/ttm/ttm_bo.c:512 ttm_bo_release+0x533/0x600 >> [  186.078794] Modules linked in: >> [  186.078795] CPU: 0 PID: 146 Comm: kworker/0:2 Kdump: loaded >> Tainted: G        W         5.12.0-rc1-default+ #81 >> [  186.078797] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), >> BIOS rel-1.12.0-59-gc9ba527-rebuilt.opensuse.org 04/01/2014 >> [  186.078799] Workqueue: events qxl_gc_work >> [  186.078801] RIP: 0010:ttm_bo_release+0x533/0x600 >> [  186.078803] Code: e9 c6 fb ff ff 4c 8b 7d d0 b9 4c 1d 00 00 31 d2 >> be 01 00 00 00 49 8b bf d0 fe ff ff e8 86 f1 04 00 49 8b >> 47 e0 e9 2b ff ff ff <0f> 0b 48 8b 45 d0 31 d2 4c 89 f7 48 8d 70 08 >> c7 80 94 00 00 00 00 >> [  186.078805] RSP: 0018:ffffa22a402e3d60 EFLAGS: 00010202 >> [  186.078807] RAX: 0000000000000001 RBX: ffff9334cd8f5668 RCX: >> 0000000000001180 >> [  186.078808] RDX: ffff93353f61a7c0 RSI: ffffffffa6401580 RDI: >> ffff9334c44f9588 >> [  186.078810] RBP: ffffa22a402e3d90 R08: 0000000000000001 R09: >> 0000000000000001 >> [  186.078811] R10: ffffa22a402e3c10 R11: ffffffffa6401580 R12: >> ffff9334c48fa300 >> [  186.078812] R13: ffff9334c0f24e90 R14: ffff9334cd8f5400 R15: >> ffff9334c4528000 >> [  186.078813] FS:  0000000000000000(0000) GS:ffff93353f600000(0000) >> knlGS:0000000000000000 >> [  186.078814] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> [  186.078816] CR2: 00007f1908079860 CR3: 0000000021824004 CR4: >> 0000000000370ef0 >> [  186.078818] DR0: 0000000000000000 DR1: 0000000000000000 DR2: >> 0000000000000000 >> [  186.078819] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: >> 0000000000000400 >> [  186.078821] Call Trace: >> [  186.078826]  qxl_bo_unref+0x3a/0x50 >> [  186.078829]  qxl_release_free_list+0x62/0xc0 >> [  186.078834]  qxl_release_free+0x76/0xe0 >> [  186.078837]  qxl_garbage_collect+0xd9/0x190 >> [  186.078843]  process_one_work+0x2b0/0x630 >> [  186.078850]  ? process_one_work+0x630/0x630 >> [  186.078853]  worker_thread+0x39/0x3f0 >> [  186.078857]  ? process_one_work+0x630/0x630 >> [  186.078859]  kthread+0x13a/0x150 >> [  186.078861]  ? kthread_create_worker_on_cpu+0x70/0x70 >> [  186.078866]  ret_from_fork+0x1f/0x30 >> [  186.078879] irq event stamp: 619687 >> [  186.091417] hardirqs last  enabled at (619761): >> [] console_unlock+0x45b/0x570 >> [  186.091421] hardirqs last disabled at (619766): >> [] vprintk_emit+0x23c/0x2c0 >> [  186.091423] softirqs last  enabled at (617742): >> [] __do_softirq+0x30f/0x432 >> [  186.091425] softirqs last disabled at (617737): >> [] irq_exit_rcu+0xea/0xf0 >> [  186.091427] ---[ end trace ac74376b06d2036c ]--- >> >> >> Tke kernel is based on Linus' tree and the last commit >> f69d02e37a85645aa90d1 ("Merge tag 'misc-5.12-2021-03-02' of >> git://git.kernel.dk/linux-block"). >> >> Best Regards, >> Petr >> _______________________________________________ >> dri-devel mailing list >> dri-devel@lists.freedesktop.org >> https://lists.freedesktop.org/mailman/listinfo/dri-devel >> >