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Wed, 3 Feb 2021 08:36:45 +0000 Subject: Re: [amdgpu] deadlock To: Daniel Gomez , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, alexander.deucher@amd.com References: From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <58e41b62-b8e0-b036-c87d-a84d53f5a26e@amd.com> Date: Wed, 3 Feb 2021 09:36:23 +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:be8a:bd56:1f94:86e7] X-ClientProxiedBy: AM0PR10CA0105.EURPRD10.PROD.OUTLOOK.COM (2603:10a6:208:e6::22) 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:be8a:bd56:1f94:86e7] (2a02:908:1252:fb60:be8a:bd56:1f94:86e7) by AM0PR10CA0105.EURPRD10.PROD.OUTLOOK.COM (2603:10a6:208:e6::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3825.17 via Frontend Transport; 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Which OpenCl stack are you using? Regards, Christian. Am 03.02.21 um 09:33 schrieb Daniel Gomez: > Hi all, > > I have a deadlock with the amdgpu mainline driver when running in parallel two > OpenCL applications. So far, we've been able to replicate it easily by executing > clinfo and MatrixMultiplication (from AMD opencl-samples). It's quite old the > opencl-samples so, if you have any other suggestion for testing I'd be very > happy to test it as well. > > How to replicate the issue: > > # while true; do /usr/bin/MatrixMultiplication --device gpu \ > --deviceId 0 -x 1000 -y 1000 -z 1000 -q -t -i 50; done > # while true; do clinfo; done > > Output: > > After a minute or less (sometimes could be more) I can see that > MatrixMultiplication and clinfo hang. In addition, with radeontop you can see > how the Graphics pipe goes from ~50% to 100%. Also the shader clocks > goes up from ~35% to ~96%. > > clinfo keeps printing: > ioctl(7, DRM_IOCTL_SYNCOBJ_WAIT, 0x7ffe46e5f950) = -1 ETIME (Timer expired) > > And MatrixMultiplication prints the following (strace) if you try to > kill the process: > > sched_yield() = 0 > futex(0x557e945343b8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, > NULL, FUTEX_BITSET_MATCH_ANYstrace: Process 651 detached > > > After this, the gpu is not functional at all and you'd need a power cycle reset > to restore the system. > > Hardware info: > CPU: AMD Ryzen Embedded V1605B with Radeon Vega Gfx (8) @ 2.000GHz > GPU: AMD ATI Radeon Vega Series / Radeon Vega Mobile Series > > 03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. > [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] > (rev 83) > DeviceName: Broadcom 5762 > Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge > [Radeon Vega Series / Radeon Vega Mobile Series] > Kernel driver in use: amdgpu > Kernel modules: amdgpu > > Linux kernel info: > > root@qt5222:~# uname -a > Linux qt5222 5.11.0-rc6-qtec-standard #2 SMP Tue Feb 2 09:41:46 UTC > 2021 x86_64 x86_64 x86_64 GNU/Linux > > By enabling the kernel locks stats I could see the MatrixMultiplication is > hanged in the amdgpu_mn_invalidate_gfx function: > > [ 738.359202] 1 lock held by MatrixMultiplic/653: > [ 738.359206] #0: ffff88810e364fe0 > (&adev->notifier_lock){+.+.}-{3:3}, at: > amdgpu_mn_invalidate_gfx+0x34/0xa0 [amdgpu] > > I can see in the the amdgpu_mn_invalidate_gfx function: the > dma_resv_wait_timeout_rcu uses wait_all (fences) and MAX_SCHEDULE_TIMEOUT so, I > guess the code gets stuck there waiting forever. According to the > documentation: "When somebody tries to invalidate the page tables we block the > update until all operations on the pages in question are completed, then those > pages are marked as accessed and also dirty if it wasn’t a read only access." > Looks like the fences are deadlocked and therefore, it never returns. Could it > be possible? any hint to where can I look to fix this? > > Thank you in advance. > > Here the full dmesg output: > > [ 738.337726] INFO: task MatrixMultiplic:653 blocked for more than 122 seconds. > [ 738.344937] Not tainted 5.11.0-rc6-qtec-standard #2 > [ 738.350384] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > disables this message. > [ 738.358240] task:MatrixMultiplic state:D stack: 0 pid: 653 > ppid: 1 flags:0x00004000 > [ 738.358254] Call Trace: > [ 738.358261] ? dma_fence_default_wait+0x1eb/0x230 > [ 738.358276] __schedule+0x370/0x960 > [ 738.358291] ? dma_fence_default_wait+0x117/0x230 > [ 738.358297] ? dma_fence_default_wait+0x1eb/0x230 > [ 738.358305] schedule+0x51/0xc0 > [ 738.358312] schedule_timeout+0x275/0x380 > [ 738.358324] ? dma_fence_default_wait+0x1eb/0x230 > [ 738.358332] ? mark_held_locks+0x4f/0x70 > [ 738.358341] ? dma_fence_default_wait+0x117/0x230 > [ 738.358347] ? lockdep_hardirqs_on_prepare+0xd4/0x180 > [ 738.358353] ? _raw_spin_unlock_irqrestore+0x39/0x40 > [ 738.358362] ? dma_fence_default_wait+0x117/0x230 > [ 738.358370] ? dma_fence_default_wait+0x1eb/0x230 > [ 738.358375] dma_fence_default_wait+0x214/0x230 > [ 738.358384] ? dma_fence_release+0x1a0/0x1a0 > [ 738.358396] dma_fence_wait_timeout+0x105/0x200 > [ 738.358405] dma_resv_wait_timeout_rcu+0x1aa/0x5e0 > [ 738.358421] amdgpu_mn_invalidate_gfx+0x55/0xa0 [amdgpu] > [ 738.358688] __mmu_notifier_release+0x1bb/0x210 > [ 738.358710] exit_mmap+0x2f/0x1e0 > [ 738.358723] ? find_held_lock+0x34/0xa0 > [ 738.358746] mmput+0x39/0xe0 > [ 738.358756] do_exit+0x5c3/0xc00 > [ 738.358763] ? find_held_lock+0x34/0xa0 > [ 738.358780] do_group_exit+0x47/0xb0 > [ 738.358791] get_signal+0x15b/0xc50 > [ 738.358807] arch_do_signal_or_restart+0xaf/0x710 > [ 738.358816] ? lockdep_hardirqs_on_prepare+0xd4/0x180 > [ 738.358822] ? _raw_spin_unlock_irqrestore+0x39/0x40 > [ 738.358831] ? ktime_get_mono_fast_ns+0x50/0xa0 > [ 738.358844] ? amdgpu_drm_ioctl+0x6b/0x80 [amdgpu] > [ 738.359044] exit_to_user_mode_prepare+0xf2/0x1b0 > [ 738.359054] syscall_exit_to_user_mode+0x19/0x60 > [ 738.359062] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > [ 738.359069] RIP: 0033:0x7f6b89a51887 > [ 738.359076] RSP: 002b:00007f6b82b54b18 EFLAGS: 00000246 ORIG_RAX: > 0000000000000010 > [ 738.359086] RAX: fffffffffffffe00 RBX: 00007f6b82b54b50 RCX: 00007f6b89a51887 > [ 738.359091] RDX: 00007f6b82b54b50 RSI: 00000000c02064c3 RDI: 0000000000000007 > [ 738.359096] RBP: 00000000c02064c3 R08: 0000000000000003 R09: 00007f6b82b54bbc > [ 738.359101] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000165a0bc00 > [ 738.359106] R13: 0000000000000007 R14: 0000000000000001 R15: 0000000000000000 > [ 738.359129] > Showing all locks held in the system: > [ 738.359141] 1 lock held by khungtaskd/54: > [ 738.359148] #0: ffffffff829f6840 (rcu_read_lock){....}-{1:2}, at: > debug_show_all_locks+0x15/0x183 > [ 738.359187] 1 lock held by systemd-journal/174: > [ 738.359202] 1 lock held by MatrixMultiplic/653: > [ 738.359206] #0: ffff88810e364fe0 > (&adev->notifier_lock){+.+.}-{3:3}, at: > amdgpu_mn_invalidate_gfx+0x34/0xa0 [amdgpu] > > Daniel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8FCBCC433E0 for ; Wed, 3 Feb 2021 08:36:50 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 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