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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 51B92C43603 for ; Thu, 5 Dec 2019 14:05:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2093122525 for ; Thu, 5 Dec 2019 14:05:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="b09ztlWc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729660AbfLEOFJ (ORCPT ); Thu, 5 Dec 2019 09:05:09 -0500 Received: from mail-oi1-f193.google.com ([209.85.167.193]:39009 "EHLO mail-oi1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729512AbfLEOFI (ORCPT ); Thu, 5 Dec 2019 09:05:08 -0500 Received: by mail-oi1-f193.google.com with SMTP id a67so2805885oib.6 for ; Thu, 05 Dec 2019 06:05:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=xeq4HgJBk0tt+S9xudVxwhQMEwHOJwN3jhLi9OPFVKY=; b=b09ztlWc8v0Um4ctng63ZDT0E7P0RKXrvR927jOraXHcGtJp+Uf2CHIS+MDhda51Bh t/U7WR4cLn1riEonp0c2aWFTbS7B4AKZl2EUZHj5NsL5WDWdHrX8BVO6KWzWJvr2InKS NcLiCmBKk1g//LRtR7nDPgmouAT6mLYsA1WLE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=xeq4HgJBk0tt+S9xudVxwhQMEwHOJwN3jhLi9OPFVKY=; b=jvH6hx+taDig2SoMMVtZWIzNoCWM1tqO7UgUzZ2hvKrIOY9uImjMtCd6mhdrntGZro xZjeGOYXSF03Y2ffzwi5qHAA8SUDY7w4HBYhOy3q78aHtrgQUwwEYRPkVAP+U25PRh89 f7Kybc2RRHFD63FIdVXT5EJmshALvjgLLnWHZKZLb+L5JOs4JDaSCDo5RtuJj14L93un onPyVfcJi5oE5fVBPDYgfULezykbJ7ARv+ckDncaEF0W5OHeDldPKdKw8og5r4OkjOFG U+YEm40iJX9+TaH5hHk6kiBTsSiFJyFMJzv2guASX79WJhoJzIpmurWIp+1oz1bik/Nb 64jg== X-Gm-Message-State: APjAAAWOv2vvBwAY09LlN4P5+rbXtIvWbbwNYFdOwksiWGrA2IedR2h9 8w2Or5IJjkCgks46w89tQfQ6dwoAi9gHLB/QvUvCMA== X-Google-Smtp-Source: APXvYqzl2QkRicAy9CfAYCw7et3Bgx9YggGL0O1f0fzAsagnw/nPzczyEThdywCyJBZDVTdqDQAUNlpNTbUK5vhRF90= X-Received: by 2002:aca:b805:: with SMTP id i5mr7462629oif.110.1575554707452; Thu, 05 Dec 2019 06:05:07 -0800 (PST) MIME-Version: 1.0 References: <0000000000006dff110598d25a9b@google.com> <000000000000bcf3bc0598f5090d@google.com> In-Reply-To: <000000000000bcf3bc0598f5090d@google.com> From: Daniel Vetter Date: Thu, 5 Dec 2019 15:04:55 +0100 Message-ID: Subject: Re: INFO: task hung in fb_open To: syzbot Cc: Dave Airlie , Ayan Kumar Halder , Bartlomiej Zolnierkiewicz , dri-devel , Gerd Hoffmann , Linux ARM , Linux Fbdev development list , Linux Kernel Mailing List , Maarten Lankhorst , Maxime Ripard , Peter Rosin , Sam Ravnborg , syzkaller-bugs , "Syrjala, Ville" , Chen-Yu Tsai Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 5, 2019 at 2:38 PM syzbot wrote: > > syzbot has bisected this bug to: > > commit 979c11ef39cee79d6f556091a357890962be2580 > Author: Ayan Kumar Halder > Date: Tue Jul 17 17:13:46 2018 +0000 > > drm/sun4i: Substitute sun4i_backend_format_is_yuv() with format->is_yuv Pretty sure your GCD machine is not using the sun4i driver. It's also very far away from the code that's blowing up. bisect gone wrong? -Daniel > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15d2f97ee00000 > start commit: 596cf45c Merge branch 'akpm' (patches from Andrew) > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=13d2f97ee00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=7d8ab2e0e09c2a82 > dashboard link: https://syzkaller.appspot.com/bug?extid=a4ae1442ccc637162dc1 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14273edae00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15e7677ae00000 > > Reported-by: syzbot+a4ae1442ccc637162dc1@syzkaller.appspotmail.com > Fixes: 979c11ef39ce ("drm/sun4i: Substitute sun4i_backend_format_is_yuv() > with format->is_yuv") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch