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=-8.7 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 6231EC2D0A8 for ; Sat, 26 Sep 2020 11:55:36 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 C67F72075A for ; Sat, 26 Sep 2020 11:55:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="GS4rXU1v"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Wx/M0MAL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C67F72075A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:To:References:Message-Id:Date:In-Reply-To:From: Subject:Mime-Version:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ASbabkw+THIIVUmptMkzaO4WtHFi3wuFxNrOsSK5Tno=; b=GS4rXU1vKVwv0RNQxedynV5OA kGtk+96+NYq2g/BszlTzL10r2HL54opZ0izYZqzfQtkSZhSqXfXxZ+AmkcpC69diMlCJF3fI0RqIr CIBo0GC6wET9qTNc5JyxHBaCarov4trYcOT98k2AoPz95IqbzKdZDYbkF0X6paixdPK39szcT/Q6a 5shajuZFI8HS65Cwbyv8j4kZSLlw8dIEVxs0/u50k02XsgjX8pvLRxsIHXh28p59WRgsnHLgBk+sW WVqfZwUG+5aOJZTas4OLhsHCatMKbIS5mt+uLll05xD1UCzvr1A9A5ubPwzc5d7CUkodA5Vn+Ghgo ZQcbmsFww==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kM8nV-0005Sq-9J; Sat, 26 Sep 2020 11:55:25 +0000 Received: from mail-wr1-x443.google.com ([2a00:1450:4864:20::443]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kM8nT-0005SW-Fw for linux-amlogic@lists.infradead.org; Sat, 26 Sep 2020 11:55:24 +0000 Received: by mail-wr1-x443.google.com with SMTP id m6so6805232wrn.0 for ; Sat, 26 Sep 2020 04:55:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=lHpDGO3eipCJBv/JBXAcsVMlGwZEUUhI8iuzgMFtJmM=; b=Wx/M0MAL/yQ+YpBbNrG0u5Kp+tUngk6GDqMhOn8Fj1vTTpFl3vdmWvBK7iUK0yle3d yz1Sea7ZDeFH4VeYCP/HABkNfDDgB1j6L+7JanT/IDuMTty92vWPf7/EleMr22lBYP7i z+3JDbySwyexLBGTRsQPhPuqYAq5PhYQ1G92kovhmnhePz2Y59ZXJPIUMjhSjEAac3Lp Su9A6TgYiV1Cq+jSP1IqIINc0SM6kh541v30iy9uT7grEZE5mloaDht1dxHiO4bVxUiJ Dm08X2uQziSlQbYBLQ8C3QebE4/0XEd1ys7d9hoRJkYO1yraiWQJDSg/P5tBq/LfaB/d xq6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=lHpDGO3eipCJBv/JBXAcsVMlGwZEUUhI8iuzgMFtJmM=; b=Qtu8OBZ7Xop/vZ1XAjpdyyyidxHKcQN3den89xltTnWnQhq4HPdyI+Epcfxc5rd79i uKu58mixTf3surRmZciim11AmskQ/NxkdiwXerv15mPKHvPj3xJR2Nsk+rB2GQte/YHr mVm0bQUpf6chAQx9Bs7MV+gyC+/4lHfJcUbdGUBIWBlA1ctKoCqEMnaphjB1sSqMz1X1 Cfgkfb2E8TJIwMhQqgiPkX0dJwno0tW6ad94PaFz++sXn8NjBg0SIWGMhNZnvv1HP0rg LSke/pY9R5MilCEYpt1cDfVPmmEMVPG8IbAc5hVGPPP64WP5LADokAmFuM7RN92SDMpD Vdpg== X-Gm-Message-State: AOAM532nJx0y+xrdNWL8OX5pwjVXbOMvwU2yBOLKbEyjAoj3pnVw2M5O nLm7EBoYVPH2nHuNqeC907I= X-Google-Smtp-Source: ABdhPJwezDQMRyJjlJ2x54xV5sUJhYCIpJFqrqR8TiMN0dETRCHh5AGT6FWowwiRJAH+y2cy8/HYIg== X-Received: by 2002:a5d:660d:: with SMTP id n13mr9515562wru.308.1601121322592; Sat, 26 Sep 2020 04:55:22 -0700 (PDT) Received: from [172.16.20.20] ([87.200.95.144]) by smtp.gmail.com with ESMTPSA id c14sm6350811wrm.64.2020.09.26.04.55.20 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 26 Sep 2020 04:55:22 -0700 (PDT) Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.15\)) Subject: Re: Deadlock under load with Linux 5.9 and other recent kernels From: Christian Hewitt In-Reply-To: <4a51f6d8-486b-73ee-0585-f2154aa90a83@kernel.dk> Date: Sat, 26 Sep 2020 15:55:20 +0400 Message-Id: References: <5878AC01-8A1B-4F39-B4BD-BDDEFAECFAA2@gmail.com> <4a51f6d8-486b-73ee-0585-f2154aa90a83@kernel.dk> To: Jens Axboe X-Mailer: Apple Mail (2.3445.104.15) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200926_075523_561230_7C5EA814 X-CRM114-Status: GOOD ( 16.88 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-block@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-usb@vger.kernel.org, furkan@fkardame.com, Brad Harper Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org PiAKPiBPbiAyNiBTZXAgMjAyMCwgYXQgMjo1MSBwbSwgSmVucyBBeGJvZSA8YXhib2VAa2VybmVs LmRrPiB3cm90ZToKPiAKPiBPbiA5LzI2LzIwIDE6NTUgQU0sIENocmlzdGlhbiBIZXdpdHQgd3Jv dGU6Cj4+IEkgYW0gdXNpbmcgYW4gQVJNIFNCQyBkZXZpY2Ugd2l0aCBBbWxvZ2ljIFM5MjJYIGNo aXAgKEJlZWxpbmsKPj4gR1MtS2luZy1YLCBhbiBBbmRyb2lkIFNUQikgdG8gYm9vdCB0aGUgS29k aSBtZWRpYWNlbnRyZSBkaXN0cm8KPj4gTGlicmVFTEVDICh3aGljaCBJIHdvcmsgb24pIGFsdGhv dWdoIHRoZSBpc3N1ZSBpcyBhbHNvIHJlcHJvZHVjaWJsZQo+PiB3aXRoIE1hbmphcm8gYW5kIEFy bWJpYW4gb24gdGhlIHNhbWUgaGFyZHdhcmUsIGFuZCB3aXRoIHRoZSBHVC1LaW5nCj4+IGFuZCBH VC1LaW5nIFBybyBkZXZpY2VzIGZyb20gdGhlIHNhbWUgdmVuZG9yIC0gYWxsIHRocmVlIGRldmlj ZXMgYXJlCj4+IHVzaW5nIGEgY29tbW9uIGR0c2k6Cj4+IAo+PiBodHRwczovL2dpdGh1Yi5jb20v Y2hld2l0dC9saW51eC9ibG9iL2FtbG9naWMtNS45LWludGVnL2FyY2gvYXJtNjQvYm9vdC9kdHMv YW1sb2dpYy9tZXNvbi1nMTJiLWdza2luZy14LmR0cwo+PiBodHRwczovL2dpdGh1Yi5jb20vY2hl d2l0dC9saW51eC9ibG9iL2FtbG9naWMtNS45LWludGVnL2FyY2gvYXJtNjQvYm9vdC9kdHMvYW1s b2dpYy9tZXNvbi1nMTJiLWd0a2luZy1wcm8uZHRzCj4+IGh0dHBzOi8vZ2l0aHViLmNvbS9jaGV3 aXR0L2xpbnV4L2Jsb2IvYW1sb2dpYy01LjktaW50ZWcvYXJjaC9hcm02NC9ib290L2R0cy9hbWxv Z2ljL21lc29uLWcxMmItZ3RraW5nLmR0cwo+PiBodHRwczovL2dpdGh1Yi5jb20vY2hld2l0dC9s aW51eC9ibG9iL2FtbG9naWMtNS45LWludGVnL2FyY2gvYXJtNjQvYm9vdC9kdHMvYW1sb2dpYy9t ZXNvbi1nMTJiLXc0MDAuZHRzaQo+PiAKPj4gSSBoYXZlIHNjaGVtYXRpY3MgZm9yIHRoZSBkZXZp Y2VzLCBidXQgY2FuIG9ubHkgc2hhcmUgdGhvc2UgcHJpdmF0ZWx5Cj4+IG9uIHJlcXVlc3QuCj4+ IAo+PiBGb3IgdGVzdGluZyBJIGFtIGJvb3RpbmcgTGlicmVFTEVDIGZyb20gU0QgY2FyZC4gVGhl IGJveCBoYXMgYSA0VEIKPj4gU0FUQSBkcml2ZSBpbnRlcm5hbGx5IGNvbm5lY3RlZCB3aXRoIGEg VVNCID4gU0FUQSBicmlkZ2UsIHNlZSBkbWVzZzoKPj4gaHR0cDovL2l4LmlvLzJ5TGggYW5kIEkg Y29ubmVjdCBhIFVTQiBzdGljayB3aXRoIGEgNEdCIElTTyBmaWxlIHRoYXQgSQo+PiBjb3B5IHRv IHRoZSBpbnRlcm5hbCBTQVRBIGRyaXZlLiBXaXRoaW4gMTAtMjAgc2Vjb25kcyBvZiBzdGFydGlu ZyB0aGUKPj4gY29weSB0aGUgYm94IGRlYWRsb2NrcyBuZWVkaW5nIGEgaGFyZCBwb3dlciBjeWNs ZSB0byByZWNvdmVyLiBUaGUKPj4gdGltaW5nIG9mIHRoZSBkZWFkbG9jayBpcyB2YXJpYWJsZSBi dXQgdGhlIGRldmljZSBfYWx3YXlzXyBkZWFkbG9ja3MuCj4+IEFsdGhvdWdoIEkgYW0gdXNpbmcg YSBzaW1wbGUgY29weSB1c2UtY2FzZSwgdGhlcmUgYXJlIHNpbWlsYXIgcmVwb3J0cwo+PiBpbiBB cm1iaWFuIGZvcnVtcyBwZXJmb3JtaW5nIHRhc2tzIGxpa2UgaW5zdGFsbHMvdXBkYXRlcyB0aGF0 IGludm9sdmUKPj4gSS9PIGxvYWRzLgo+PiAKPj4gRm9sbG93aW5nIGFkdmljZSBpbiB0aGUgI2xp bnV4LWFtbG9naWMgSVJDIGNoYW5uZWwgSSBhZGRlZAo+PiBDT05GSUdfU09GVExPQ0tVUF9ERVRF Q1RPUiBhbmQgQ09ORklHX0RFVEVDVF9IVU5HX1RBU0sgYW5kIHdhcyBhYmxlIHRvCj4+IGdldCBv dXRwdXQgb24gdGhlIEhETUkgc2NyZWVuIChpdCBpcyBub3QgcG9zc2libGUgdG8gY29ubmVjdCB0 byBVQVJUCj4+IHBpbnMgd2l0aG91dCBkZXN0cm95aW5nIHRoZSBib3ggY2FzZSkuIElmIHlvdSBh ZHZhbmNlIHRoZSBmb2xsb3dpbmcKPj4gdmlkZW8gZnJhbWUgYnkgZnJhbWUgaW4gVkxDIHlvdSBj YW4gc2VlIHRoZSBvdXRwdXQ6Cj4+IAo+PiBodHRwczovL3d3dy5kcm9wYm94LmNvbS9zL2tsdmNp emltOGNzNWx6ZS9sb2NrdXBfY2xpcC5tb3Y/ZGw9MAo+IAo+IFRyeSB3aXRoIHRoaXMgcGF0Y2g6 Cj4gCj4gaHR0cHM6Ly9sb3JlLmtlcm5lbC5vcmcvbGludXgtYmxvY2svMjAyMDA5MjUxOTE5MDIu NTQzOTUzLTEtc2hha2VlbGJAZ29vZ2xlLmNvbS8KCkl0IHN0aWxsIGxvY2tzIHVwIGFwcHJveC4g MjUgc2Vjb25kcyBpbnRvIHRoZSBjb3B5IG9wZXJhdGlvbi4gSGVyZeKAmXMgdGhlIG91dHB1dCBp biB2aWRlbyBhZ2FpbiAoYSBsaXR0bGUgYmx1cnJ5KToKCmh0dHBzOi8vd3d3LmRyb3Bib3guY29t L3MvM2oyY3phcTUwOWFyZzZnL2xvY2t1cF9jbGlwMi5tb3Y/ZGw9MAoKQ2hyaXN0aWFuCl9fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFtbG9naWMg bWFpbGluZyBsaXN0CmxpbnV4LWFtbG9naWNAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlz dHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFtbG9naWMK