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[188.155.176.92]) by smtp.gmail.com with ESMTPSA id h14-20020a1709070b0e00b006f3ef214db9sm858906ejl.31.2022.04.29.11.29.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 29 Apr 2022 11:29:27 -0700 (PDT) Message-ID: Date: Fri, 29 Apr 2022 20:29:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH v7 12/12] rpmsg: Fix kfree() of static memory on setting driver_override Content-Language: en-US To: Marek Szyprowski , Greg Kroah-Hartman , "Rafael J. Wysocki" Cc: Stuart Yoder , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Bjorn Helgaas , Bjorn Andersson , Mathieu Poirier , Vineeth Vijayan , Peter Oberparleiter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Andy Gross , linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, NXP Linux Team , linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-spi@vger.kernel.org, virtualization@lists.linux-foundation.org, Linus Torvalds , Rasmus Villemoes , Andy Shevchenko References: <20220419113435.246203-1-krzysztof.kozlowski@linaro.org> <20220419113435.246203-13-krzysztof.kozlowski@linaro.org> <870885de-33f3-e0ba-4d56-71c3c993ac87@samsung.com> <75b94ccd-b739-2164-bc4a-20025356cc34@linaro.org> <6e21f7d3-49d0-eda7-7a89-0f8ac69596a4@samsung.com> From: Krzysztof Kozlowski In-Reply-To: <6e21f7d3-49d0-eda7-7a89-0f8ac69596a4@samsung.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org On 29/04/2022 16:51, Marek Szyprowski wrote: > On 29.04.2022 16:16, Krzysztof Kozlowski wrote: >> On 29/04/2022 14:29, Marek Szyprowski wrote: >>> On 19.04.2022 13:34, Krzysztof Kozlowski wrote: >>>> The driver_override field from platform driver should not be initialized >>>> from static memory (string literal) because the core later kfree() it, >>>> for example when driver_override is set via sysfs. >>>> >>>> Use dedicated helper to set driver_override properly. >>>> >>>> Fixes: 950a7388f02b ("rpmsg: Turn name service into a stand alone driver") >>>> Fixes: c0cdc19f84a4 ("rpmsg: Driver for user space endpoint interface") >>>> Signed-off-by: Krzysztof Kozlowski >>>> Reviewed-by: Bjorn Andersson >>> This patch landed recently in linux-next as commit 42cd402b8fd4 ("rpmsg: >>> Fix kfree() of static memory on setting driver_override"). In my tests I >>> found that it triggers the following issue during boot of the >>> DragonBoard410c SBC (arch/arm64/boot/dts/qcom/apq8016-sbc.dtb): >>> >>> ------------[ cut here ]------------ >>> DEBUG_LOCKS_WARN_ON(lock->magic != lock) >>> WARNING: CPU: 1 PID: 8 at kernel/locking/mutex.c:582 >>> __mutex_lock+0x1ec/0x430 >>> Modules linked in: >>> CPU: 1 PID: 8 Comm: kworker/u8:0 Not tainted 5.18.0-rc4-next-20220429 #11815 >>> Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT) >>> Workqueue: events_unbound deferred_probe_work_func >>> pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) >>> pc : __mutex_lock+0x1ec/0x430 >>> lr : __mutex_lock+0x1ec/0x430 >>> .. >>> Call trace: >>>  __mutex_lock+0x1ec/0x430 >>>  mutex_lock_nested+0x38/0x64 >>>  driver_set_override+0x124/0x150 >>>  qcom_smd_register_edge+0x2a8/0x4ec >>>  qcom_smd_probe+0x54/0x80 >>>  platform_probe+0x68/0xe0 >>>  really_probe.part.0+0x9c/0x29c >>>  __driver_probe_device+0x98/0x144 >>>  driver_probe_device+0xac/0x14c >>>  __device_attach_driver+0xb8/0x120 >>>  bus_for_each_drv+0x78/0xd0 >>>  __device_attach+0xd8/0x180 >>>  device_initial_probe+0x14/0x20 >>>  bus_probe_device+0x9c/0xa4 >>>  deferred_probe_work_func+0x88/0xc4 >>>  process_one_work+0x288/0x6bc >>>  worker_thread+0x248/0x450 >>>  kthread+0x118/0x11c >>>  ret_from_fork+0x10/0x20 >>> irq event stamp: 3599 >>> hardirqs last  enabled at (3599): [] >>> _raw_spin_unlock_irqrestore+0x98/0x9c >>> hardirqs last disabled at (3598): [] >>> _raw_spin_lock_irqsave+0xc0/0xcc >>> softirqs last  enabled at (3554): [] _stext+0x470/0x5e8 >>> softirqs last disabled at (3549): [] >>> __irq_exit_rcu+0x180/0x1ac >>> ---[ end trace 0000000000000000 ]--- >>> >>> I don't see any direct relation between the $subject and the above log, >>> but reverting the $subject on top of linux next-20220429 hides/fixes it. >>> Maybe there is a kind of memory trashing somewhere there and your change >>> only revealed it? >> Thanks for the report. I think the error path of my patch is wrong - I >> should not kfree(rpdev->driver_override) from the rpmsg code. That's the >> only thing I see now... >> >> Could you test following patch and tell if it helps? >> https://pastebin.ubuntu.com/p/rp3q9Z5fXj/ > > This doesn't help, the issue is still reported. I think I screwed this part of code. The new helper uses device_lock() (the mutexes you see in backtrace) but in rpmsg it is called before device_register() which initializes the device. I don't have a device using qcom-smd rpmsg, so it's a bit tricky to reproduce. Best regards, Krzysztof 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 08240C433EF for ; Fri, 29 Apr 2022 18:30:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=VDgex54XM/ay7S3WXkA8QHvX9eU/irNl78p0AG5mQng=; b=JIyBhNVUjiwePU hZxX9AWwlgpyakRf2P2cEwxwOH/yxtS4/OjHjuNw8WCl1qbT9B4Rrec3znUj0C4Jxid6dDw5R3OWc VqjVQvMOkeFNTcCzOXY4Q4VLEQBwnhOn795d1BKUNcUicnX1c4vrgO4a2IaGVCoTk3DY5ZrYmxGRz S1Djnu6d7uBmdgl2/fgac2Ggl+IjQoHuimqNlIqJyml5m8ofEVc8vMXcWTbj2tTUOnHcOFKmkj4cc RxNlyf4VVM0tbhYynpV050J/9SMC3r2gUB6urs6ypMx1FJHjZgfunrqK0PjhJ74n/+hywzCTqlC4R iBmTspLsJHZ9k+QQG/eA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nkVN1-00CD88-Eb; Fri, 29 Apr 2022 18:29:35 +0000 Received: from mail-ej1-x62f.google.com ([2a00:1450:4864:20::62f]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nkVMy-00CD7g-2y for linux-arm-kernel@lists.infradead.org; Fri, 29 Apr 2022 18:29:33 +0000 Received: by mail-ej1-x62f.google.com with SMTP id y3so16934634ejo.12 for ; Fri, 29 Apr 2022 11:29:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to:content-transfer-encoding; bh=1Zn4UF57t4pnfMwkACd31jjeal5RhpHnkwFarZTu/dQ=; b=Yju2gP3H7feQ0jeMIY/hZkOEOoSoa00CEibfna6oVQzF9/eQ5+ytMAsdLe5WX7mHeQ J61qzVV7hJgD2E7DTMm799fD1ExZWC92O5Z5MQJ3Izz75VW5dcvN/q6CSgHUbws9RglY 83cEuaWdBuKpqQTXIrafNSDyCsuv2Ew28D74WXz/Ik2eST10Un3FzGmvqMC8O+fYL4PC 8JQYD4vG/i4KtH8ZMZH0GPFGUg6Nz8RKmYkXLtDfxBXypISaZi6+WTwWX/9LGj3oj9Ql L8++NV0TVRjT6Iqj0aHMEIgQOGyyJP0xnB5R1z3nGhE9kAKq1TuJQ1gQ5SW7rPZfWhCn o50w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=1Zn4UF57t4pnfMwkACd31jjeal5RhpHnkwFarZTu/dQ=; b=2st5ka0tiPl8pYDGBvzWSnluPHm/JFyKC3uRUyHHyW6b+szRCBiaAwHNS9cI9vwBmV IOYClzxmI+szo0Fts+V8yeHamLG86/d6bwAHCn3okF5A8/Jh9LLasF9NXL8aJFDNKmRD /l7PTcrMeV2fxJ+9LptOMWCAEI8mw9BWmAc+c1pRYHtUb1eqlkLDg+TRvcW+3LZ+YhTY LW7+pcD2787hYED7e2Qf1DyNVVv/76xZClTufZh9as12lqmCcKkWW+JlLar4/fagIS6C SO/nE39XXrHGoXvMHA6N6S0yWAs/A4pWMuHGfkU5YYbVlXxUDxm6i1ClVp64+jWA1xQG TP0g== X-Gm-Message-State: AOAM530qi7r0KEAi/PsY4qbNsLYoqe6MZQ/HYC11MlcFyEIL/PugcGwQ B5JusRXrpHAjp3U1STea2BIgFQ== X-Google-Smtp-Source: ABdhPJxnnexTfm1ciFrnHmiTZVvUaiD85uL4/xEhS6m4C1gFLe/tyvaZCnOhPWZFKjyEpqAej5KZuQ== X-Received: by 2002:a17:907:2cc6:b0:6f0:2de3:9446 with SMTP id hg6-20020a1709072cc600b006f02de39446mr581569ejc.690.1651256968301; Fri, 29 Apr 2022 11:29:28 -0700 (PDT) Received: from [192.168.0.175] (xdsl-188-155-176-92.adslplus.ch. [188.155.176.92]) by smtp.gmail.com with ESMTPSA id h14-20020a1709070b0e00b006f3ef214db9sm858906ejl.31.2022.04.29.11.29.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 29 Apr 2022 11:29:27 -0700 (PDT) Message-ID: Date: Fri, 29 Apr 2022 20:29:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH v7 12/12] rpmsg: Fix kfree() of static memory on setting driver_override Content-Language: en-US To: Marek Szyprowski , Greg Kroah-Hartman , "Rafael J. Wysocki" Cc: Stuart Yoder , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Bjorn Helgaas , Bjorn Andersson , Mathieu Poirier , Vineeth Vijayan , Peter Oberparleiter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Andy Gross , linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, NXP Linux Team , linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-spi@vger.kernel.org, virtualization@lists.linux-foundation.org, Linus Torvalds , Rasmus Villemoes , Andy Shevchenko References: <20220419113435.246203-1-krzysztof.kozlowski@linaro.org> <20220419113435.246203-13-krzysztof.kozlowski@linaro.org> <870885de-33f3-e0ba-4d56-71c3c993ac87@samsung.com> <75b94ccd-b739-2164-bc4a-20025356cc34@linaro.org> <6e21f7d3-49d0-eda7-7a89-0f8ac69596a4@samsung.com> From: Krzysztof Kozlowski In-Reply-To: <6e21f7d3-49d0-eda7-7a89-0f8ac69596a4@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220429_112932_194215_E22BFDB6 X-CRM114-Status: GOOD ( 18.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMjkvMDQvMjAyMiAxNjo1MSwgTWFyZWsgU3p5cHJvd3NraSB3cm90ZToKPiBPbiAyOS4wNC4y MDIyIDE2OjE2LCBLcnp5c3p0b2YgS296bG93c2tpIHdyb3RlOgo+PiBPbiAyOS8wNC8yMDIyIDE0 OjI5LCBNYXJlayBTenlwcm93c2tpIHdyb3RlOgo+Pj4gT24gMTkuMDQuMjAyMiAxMzozNCwgS3J6 eXN6dG9mIEtvemxvd3NraSB3cm90ZToKPj4+PiBUaGUgZHJpdmVyX292ZXJyaWRlIGZpZWxkIGZy b20gcGxhdGZvcm0gZHJpdmVyIHNob3VsZCBub3QgYmUgaW5pdGlhbGl6ZWQKPj4+PiBmcm9tIHN0 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