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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DFAEDC43217 for ; Tue, 15 Mar 2022 12:04:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348119AbiCOMFf (ORCPT ); Tue, 15 Mar 2022 08:05:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42436 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233997AbiCOMFf (ORCPT ); Tue, 15 Mar 2022 08:05:35 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4B7ED52E72; Tue, 15 Mar 2022 05:04:23 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id s42so19329908pfg.0; Tue, 15 Mar 2022 05:04:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=Uk+trKTmv4OHZazX5n2Z6Y+7WCkuvCW9bJ/ylyLCIlU=; b=bVptJXmwmq6k6OUSAUF/Yd1FQ97UY+8l6gG1Iu8Q3dPLGZCllHLa0o+bs5xgaEKJng eEubmm6FZCCeC/xB5/6J999xTjq9nXfcWjh8XJnp3jTsxPiDHccMt/GwHtCynaPRCsdd OpSfUrOrgKuZffNOHq+DW2hGttb9Vpfb2YsOsxnvFhZm123lCvJYCUAk3/5eICa5d7t+ V9xgDRhMfGXU/pRIcicwDfu26iUIqHtLG6z36YR+6q4aCPpTEm5d5nCzjqDTxLFCskXH LJn1f88cgrUqihu2eY/8IrKZwnn9wq/mU/qTrjBuy+EW9LgTmRv/WekgNIkbYwPgGGG2 qQVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=Uk+trKTmv4OHZazX5n2Z6Y+7WCkuvCW9bJ/ylyLCIlU=; b=Yu2QD9JVEUfg6G3Y3e4RxU7Lr1jl1DmbHTJDZlDRI7f6d6mWkzjpklxHzv2rxwq4cs nmdvnWkRSSE/91+ZFb8lYe76pijOgpqY2BFBmD9/LWIsVEOQunAvuC/iUcPN4MlZVm6q IUszdNa2JiDkqkNqttgiBbVHKSCCHt5taszohMjhTpSTzJ+AY7HzC2ArqW79fqJkUQaC 2PXTme4OOjwkcnoXiEWA4WSvA2/UN3F7v1AyQKz+mVe0yOYvegdQh/E5nKNe1VigUxjY eIcyLqoEBqBWlDhEjbsmKJ9bVykEtppc1GpDluh1kPUdWCyxtWfnjHLzZiCGPD8GYG2f G8Ow== X-Gm-Message-State: AOAM530hLcNOJ8V0CwI0HQKo2KchDQYfJjf/Piv64MAiUNMz+hd55Tjj aUyT28Gonfftgx2x90cEcE4= X-Google-Smtp-Source: ABdhPJzDMpKhPVS3UR+SPpnJBt/JV72yW+bNTlusJ5lGLtPSPFG4eaHSQgeZyvz3EZ59vk34Jl6rLg== X-Received: by 2002:aa7:9156:0:b0:4f6:dbc5:d0be with SMTP id 22-20020aa79156000000b004f6dbc5d0bemr28531425pfi.13.1647345862671; Tue, 15 Mar 2022 05:04:22 -0700 (PDT) Received: from odroid ([114.29.23.97]) by smtp.gmail.com with ESMTPSA id h2-20020a056a00218200b004f66d50f054sm24227869pfi.158.2022.03.15.05.04.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Mar 2022 05:04:22 -0700 (PDT) Date: Tue, 15 Mar 2022 12:04:07 +0000 From: Hyeonggon Yoo <42.hyeyoo@gmail.com> To: Byungchul Park Cc: torvalds@linux-foundation.org, damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, mingo@redhat.com, linux-kernel@vger.kernel.org, peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, chris@chris-wilson.co.uk, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, bfields@fieldses.org, gregkh@linuxfoundation.org, kernel-team@lge.com, linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org, jglisse@redhat.com, dennis@kernel.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org, paolo.valente@linaro.org, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, jack@suse.cz, jack@suse.com, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, airlied@linux.ie, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com Subject: Re: [PATCH v4 00/24] DEPT(Dependency Tracker) Message-ID: <20220315120407.GA1471334@odroid> References: <1646377603-19730-1-git-send-email-byungchul.park@lge.com> <20220314065906.GA6255@X58A-UD3R> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220314065906.GA6255@X58A-UD3R> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Mon, Mar 14, 2022 at 03:59:06PM +0900, Byungchul Park wrote: > On Sat, Mar 12, 2022 at 01:53:26AM +0000, Hyeonggon Yoo wrote: > > On Fri, Mar 04, 2022 at 04:06:19PM +0900, Byungchul Park wrote: > > > Hi Linus and folks, > > > > > > I've been developing a tool for detecting deadlock possibilities by > > > tracking wait/event rather than lock(?) acquisition order to try to > > > cover all synchonization machanisms. It's done on v5.17-rc1 tag. > > > > > > https://github.com/lgebyungchulpark/linux-dept/commits/dept1.14_on_v5.17-rc1 > > > > > > > Small feedback unrelated to thread: > > I'm not sure "Need to expand the ring buffer" is something to call > > WARN(). Is this stack trace useful for something? > > Yeah. It seems to happen too often. I won't warn it. Thanks. Thanks! > > ======== > > > > Hello Byungchul. These are two warnings of DEPT on system. > > Both cases look similar. > > > > In what case DEPT says (unknown)? > > I'm not sure we can properly debug this. > > > > =================================================== > > DEPT: Circular dependency has been detected. > > 5.17.0-rc1+ #3 Tainted: G W > > --------------------------------------------------- > > summary > > --------------------------------------------------- > > *** AA DEADLOCK *** > > > > context A > > [S] (unknown)(&vfork:0) > > [W] wait_for_completion_killable(&vfork:0) > > [E] complete(&vfork:0) > > All the reports look like having to do with kernel_clone(). I need to > check it more. Thank you very much. > > You are awesome, Hyeonggon. > Thank you. Let me know if there is something I can help! > Thank you, > Byungchul > > > [S]: start of the event context > > [W]: the wait blocked > > [E]: the event not reachable > > --------------------------------------------------- > > context A's detail > > --------------------------------------------------- > > context A > > [S] (unknown)(&vfork:0) > > [W] wait_for_completion_killable(&vfork:0) > > [E] complete(&vfork:0) > > > > [S] (unknown)(&vfork:0): > > (N/A) > > > > [W] wait_for_completion_killable(&vfork:0): > > [] kernel_clone+0x25c/0x2b8 > > stacktrace: > > dept_wait+0x74/0x88 > > wait_for_completion_killable+0x60/0xa0 > > kernel_clone+0x25c/0x2b8 > > __do_sys_clone+0x5c/0x74 > > __arm64_sys_clone+0x18/0x20 > > invoke_syscall.constprop.0+0x78/0xc4 > > do_el0_svc+0x98/0xd0 > > el0_svc+0x44/0xe4 > > el0t_64_sync_handler+0xb0/0x12c > > el0t_64_sync+0x158/0x15c > > > > [E] complete(&vfork:0): > > [] mm_release+0x7c/0x90 > > stacktrace: > > dept_event+0xe0/0x100 > > complete+0x48/0x98 > > mm_release+0x7c/0x90 > > exit_mm_release+0xc/0x14 > > do_exit+0x1b4/0x81c > > do_group_exit+0x30/0x9c > > __wake_up_parent+0x0/0x24 > > invoke_syscall.constprop.0+0x78/0xc4 > > do_el0_svc+0x98/0xd0 > > el0_svc+0x44/0xe4 > > el0t_64_sync_handler+0xb0/0x12c > > el0t_64_sync+0x158/0x15c > > --------------------------------------------------- > > information that might be helpful > > --------------------------------------------------- > > CPU: 6 PID: 229 Comm: start-stop-daem Tainted: G W 5.17.0-rc1+ #3 > > Hardware name: linux,dummy-virt (DT) > > Call trace: > > dump_backtrace.part.0+0x9c/0xc4 > > show_stack+0x14/0x28 > > dump_stack_lvl+0x9c/0xcc > > dump_stack+0x14/0x2c > > print_circle+0x2d4/0x438 > > cb_check_dl+0x44/0x70 > > bfs+0x60/0x168 > > add_dep+0x88/0x11c > > do_event.constprop.0+0x19c/0x2c0 > > dept_event+0xe0/0x100 > > complete+0x48/0x98 > > mm_release+0x7c/0x90 > > exit_mm_release+0xc/0x14 > > do_exit+0x1b4/0x81c > > do_group_exit+0x30/0x9c > > __wake_up_parent+0x0/0x24 > > invoke_syscall.constprop.0+0x78/0xc4 > > do_el0_svc+0x98/0xd0 > > el0_svc+0x44/0xe4 > > el0t_64_sync_handler+0xb0/0x12c > > el0t_64_sync+0x158/0x15c > > > > > > > > > > =================================================== > > DEPT: Circular dependency has been detected. > > 5.17.0-rc1+ #3 Tainted: G W > > --------------------------------------------------- > > summary > > --------------------------------------------------- > > *** AA DEADLOCK *** > > > > context A > > [S] (unknown)(&try_completion:0) > > [W] wait_for_completion_timeout(&try_completion:0) > > [E] complete(&try_completion:0) > > > > [S]: start of the event context > > [W]: the wait blocked > > [E]: the event not reachable > > --------------------------------------------------- > > context A's detail > > --------------------------------------------------- > > context A > > [S] (unknown)(&try_completion:0) > > [W] wait_for_completion_timeout(&try_completion:0) > > [E] complete(&try_completion:0) > > > > [S] (unknown)(&try_completion:0): > > (N/A) > > > > [W] wait_for_completion_timeout(&try_completion:0): > > [] kunit_try_catch_run+0xb4/0x160 > > stacktrace: > > dept_wait+0x74/0x88 > > wait_for_completion_timeout+0x64/0xa0 > > kunit_try_catch_run+0xb4/0x160 > > kunit_test_try_catch_successful_try_no_catch+0x3c/0x98 > > kunit_try_run_case+0x9c/0xa0 > > kunit_generic_run_threadfn_adapter+0x1c/0x28 > > kthread+0xd4/0xe4 > > ret_from_fork+0x10/0x20 > > > > [E] complete(&try_completion:0): > > [] kthread_complete_and_exit+0x18/0x20 > > stacktrace: > > dept_event+0xe0/0x100 > > complete+0x48/0x98 > > kthread_complete_and_exit+0x18/0x20 > > kunit_try_catch_throw+0x0/0x1c > > kthread+0xd4/0xe4 > > ret_from_fork+0x10/0x20 > > > > --------------------------------------------------- > > information that might be helpful > > --------------------------------------------------- > > CPU: 15 PID: 132 Comm: kunit_try_catch Tainted: G W 5.17.0-rc1+ #3 > > Hardware name: linux,dummy-virt (DT) > > Call trace: > > dump_backtrace.part.0+0x9c/0xc4 > > show_stack+0x14/0x28 > > dump_stack_lvl+0x9c/0xcc > > dump_stack+0x14/0x2c > > print_circle+0x2d4/0x438 > > cb_check_dl+0x44/0x70 > > bfs+0x60/0x168 > > add_dep+0x88/0x11c > > do_event.constprop.0+0x19c/0x2c0 > > dept_event+0xe0/0x100 > > complete+0x48/0x98 > > kthread_complete_and_exit+0x18/0x20 > > kunit_try_catch_throw+0x0/0x1c > > kthread+0xd4/0xe4 > > ret_from_fork+0x10/0x20 > > > > -- > > Thank you, You are awesome! > > Hyeonggon :-) 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id CF683C433EF for ; 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Tue, 15 Mar 2022 05:04:22 -0700 (PDT) Date: Tue, 15 Mar 2022 12:04:07 +0000 From: Hyeonggon Yoo <42.hyeyoo@gmail.com> To: Byungchul Park Subject: Re: [PATCH v4 00/24] DEPT(Dependency Tracker) Message-ID: <20220315120407.GA1471334@odroid> References: <1646377603-19730-1-git-send-email-byungchul.park@lge.com> <20220314065906.GA6255@X58A-UD3R> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220314065906.GA6255@X58A-UD3R> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: hamohammed.sa@gmail.com, jack@suse.cz, peterz@infradead.org, daniel.vetter@ffwll.ch, amir73il@gmail.com, david@fromorbit.com, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, bfields@fieldses.org, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, joel@joelfernandes.org, cl@linux.com, will@kernel.org, duyuyang@gmail.com, sashal@kernel.org, paolo.valente@linaro.org, damien.lemoal@opensource.wdc.com, willy@infradead.org, hch@infradead.org, airlied@linux.ie, mingo@redhat.com, djwong@kernel.org, vdavydov.dev@gmail.com, rientjes@google.com, dennis@kernel.org, linux-ext4@vger.kernel.org, linux-mm@kvack.org, ngupta@vflare.org, johannes.berg@intel.com, jack@suse.com, dan.j.williams@intel.com, josef@toxicpanda.com, rostedt@goodmis.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, jglisse@redhat.com, viro@zeniv.linux.org.uk, tglx@linutronix.de, mhocko@kernel.org, vbabka@suse.cz, melissa.srw@gmail.com, sj@kernel.org, tytso@mit.edu, rodrigosiqueiramelo@gmail.com, kernel-team@lge.com, gregkh@linuxfoundation.org, jlayton@kernel.org, linux-kernel@vger.kernel.org, penberg@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, tj@kernel.org, akpm@linux-foundation.org, torvalds@linux-foundation.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Mon, Mar 14, 2022 at 03:59:06PM +0900, Byungchul Park wrote: > On Sat, Mar 12, 2022 at 01:53:26AM +0000, Hyeonggon Yoo wrote: > > On Fri, Mar 04, 2022 at 04:06:19PM +0900, Byungchul Park wrote: > > > Hi Linus and folks, > > > > > > I've been developing a tool for detecting deadlock possibilities by > > > tracking wait/event rather than lock(?) acquisition order to try to > > > cover all synchonization machanisms. It's done on v5.17-rc1 tag. > > > > > > https://github.com/lgebyungchulpark/linux-dept/commits/dept1.14_on_v5.17-rc1 > > > > > > > Small feedback unrelated to thread: > > I'm not sure "Need to expand the ring buffer" is something to call > > WARN(). Is this stack trace useful for something? > > Yeah. It seems to happen too often. I won't warn it. Thanks. Thanks! > > ======== > > > > Hello Byungchul. These are two warnings of DEPT on system. > > Both cases look similar. > > > > In what case DEPT says (unknown)? > > I'm not sure we can properly debug this. > > > > =================================================== > > DEPT: Circular dependency has been detected. > > 5.17.0-rc1+ #3 Tainted: G W > > --------------------------------------------------- > > summary > > --------------------------------------------------- > > *** AA DEADLOCK *** > > > > context A > > [S] (unknown)(&vfork:0) > > [W] wait_for_completion_killable(&vfork:0) > > [E] complete(&vfork:0) > > All the reports look like having to do with kernel_clone(). I need to > check it more. Thank you very much. > > You are awesome, Hyeonggon. > Thank you. Let me know if there is something I can help! > Thank you, > Byungchul > > > [S]: start of the event context > > [W]: the wait blocked > > [E]: the event not reachable > > --------------------------------------------------- > > context A's detail > > --------------------------------------------------- > > context A > > [S] (unknown)(&vfork:0) > > [W] wait_for_completion_killable(&vfork:0) > > [E] complete(&vfork:0) > > > > [S] (unknown)(&vfork:0): > > (N/A) > > > > [W] wait_for_completion_killable(&vfork:0): > > [] kernel_clone+0x25c/0x2b8 > > stacktrace: > > dept_wait+0x74/0x88 > > wait_for_completion_killable+0x60/0xa0 > > kernel_clone+0x25c/0x2b8 > > __do_sys_clone+0x5c/0x74 > > __arm64_sys_clone+0x18/0x20 > > invoke_syscall.constprop.0+0x78/0xc4 > > do_el0_svc+0x98/0xd0 > > el0_svc+0x44/0xe4 > > el0t_64_sync_handler+0xb0/0x12c > > el0t_64_sync+0x158/0x15c > > > > [E] complete(&vfork:0): > > [] mm_release+0x7c/0x90 > > stacktrace: > > dept_event+0xe0/0x100 > > complete+0x48/0x98 > > mm_release+0x7c/0x90 > > exit_mm_release+0xc/0x14 > > do_exit+0x1b4/0x81c > > do_group_exit+0x30/0x9c > > __wake_up_parent+0x0/0x24 > > invoke_syscall.constprop.0+0x78/0xc4 > > do_el0_svc+0x98/0xd0 > > el0_svc+0x44/0xe4 > > el0t_64_sync_handler+0xb0/0x12c > > el0t_64_sync+0x158/0x15c > > --------------------------------------------------- > > information that might be helpful > > --------------------------------------------------- > > CPU: 6 PID: 229 Comm: start-stop-daem Tainted: G W 5.17.0-rc1+ #3 > > Hardware name: linux,dummy-virt (DT) > > Call trace: > > dump_backtrace.part.0+0x9c/0xc4 > > show_stack+0x14/0x28 > > dump_stack_lvl+0x9c/0xcc > > dump_stack+0x14/0x2c > > print_circle+0x2d4/0x438 > > cb_check_dl+0x44/0x70 > > bfs+0x60/0x168 > > add_dep+0x88/0x11c > > do_event.constprop.0+0x19c/0x2c0 > > dept_event+0xe0/0x100 > > complete+0x48/0x98 > > mm_release+0x7c/0x90 > > exit_mm_release+0xc/0x14 > > do_exit+0x1b4/0x81c > > do_group_exit+0x30/0x9c > > __wake_up_parent+0x0/0x24 > > invoke_syscall.constprop.0+0x78/0xc4 > > do_el0_svc+0x98/0xd0 > > el0_svc+0x44/0xe4 > > el0t_64_sync_handler+0xb0/0x12c > > el0t_64_sync+0x158/0x15c > > > > > > > > > > =================================================== > > DEPT: Circular dependency has been detected. > > 5.17.0-rc1+ #3 Tainted: G W > > --------------------------------------------------- > > summary > > --------------------------------------------------- > > *** AA DEADLOCK *** > > > > context A > > [S] (unknown)(&try_completion:0) > > [W] wait_for_completion_timeout(&try_completion:0) > > [E] complete(&try_completion:0) > > > > [S]: start of the event context > > [W]: the wait blocked > > [E]: the event not reachable > > --------------------------------------------------- > > context A's detail > > --------------------------------------------------- > > context A > > [S] (unknown)(&try_completion:0) > > [W] wait_for_completion_timeout(&try_completion:0) > > [E] complete(&try_completion:0) > > > > [S] (unknown)(&try_completion:0): > > (N/A) > > > > [W] wait_for_completion_timeout(&try_completion:0): > > [] kunit_try_catch_run+0xb4/0x160 > > stacktrace: > > dept_wait+0x74/0x88 > > wait_for_completion_timeout+0x64/0xa0 > > kunit_try_catch_run+0xb4/0x160 > > kunit_test_try_catch_successful_try_no_catch+0x3c/0x98 > > kunit_try_run_case+0x9c/0xa0 > > kunit_generic_run_threadfn_adapter+0x1c/0x28 > > kthread+0xd4/0xe4 > > ret_from_fork+0x10/0x20 > > > > [E] complete(&try_completion:0): > > [] kthread_complete_and_exit+0x18/0x20 > > stacktrace: > > dept_event+0xe0/0x100 > > complete+0x48/0x98 > > kthread_complete_and_exit+0x18/0x20 > > kunit_try_catch_throw+0x0/0x1c > > kthread+0xd4/0xe4 > > ret_from_fork+0x10/0x20 > > > > --------------------------------------------------- > > information that might be helpful > > --------------------------------------------------- > > CPU: 15 PID: 132 Comm: kunit_try_catch Tainted: G W 5.17.0-rc1+ #3 > > Hardware name: linux,dummy-virt (DT) > > Call trace: > > dump_backtrace.part.0+0x9c/0xc4 > > show_stack+0x14/0x28 > > dump_stack_lvl+0x9c/0xcc > > dump_stack+0x14/0x2c > > print_circle+0x2d4/0x438 > > cb_check_dl+0x44/0x70 > > bfs+0x60/0x168 > > add_dep+0x88/0x11c > > do_event.constprop.0+0x19c/0x2c0 > > dept_event+0xe0/0x100 > > complete+0x48/0x98 > > kthread_complete_and_exit+0x18/0x20 > > kunit_try_catch_throw+0x0/0x1c > > kthread+0xd4/0xe4 > > ret_from_fork+0x10/0x20 > > > > -- > > Thank you, You are awesome! > > Hyeonggon :-)