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=-13.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 03962C433DF for ; Thu, 21 May 2020 14:21:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CA0242072C for ; Thu, 21 May 2020 14:21:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="nVtO74pa" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729493AbgEUOVU (ORCPT ); Thu, 21 May 2020 10:21:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726965AbgEUOVT (ORCPT ); Thu, 21 May 2020 10:21:19 -0400 Received: from mail-qt1-x842.google.com (mail-qt1-x842.google.com [IPv6:2607:f8b0:4864:20::842]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4F6CBC061A0E for ; Thu, 21 May 2020 07:21:19 -0700 (PDT) Received: by mail-qt1-x842.google.com with SMTP id v4so5597368qte.3 for ; Thu, 21 May 2020 07:21:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Pcs70r+jLgxPgoJvLwzbsID0j/rkvxXG6DlxyjvqoHw=; b=nVtO74pap1x8NIfAz5i0d2jKSmGXkeOJVwRYOKDarinCRDgjGGUkxE/J1TzUNJygsB O0ZN796Z0V2+Aa818R8buT8JqL2CU6R27ko02QCE3xn2FnMUlLaIGEbuvrrYh+6029bv Bk40Rvo/C5vIvkdkbSXp1Xi06BFwFlDOeVBpLQRCbJ5NqywhmTDL7yTSz8jhJFCVqoRq 895JFanRAKlfeBE0G0OciV7jFbKC0KFOgNCLs4sipHE0m5TW8vhoXDLf1Ln90s1K75Pl dZ3gY9Imvc0UZWiZ2ETTlJz9pw1zPPnBlNcwcTbmamAUtuSvb+9t66vXLhKcdRF3zxtV vnIw== 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=Pcs70r+jLgxPgoJvLwzbsID0j/rkvxXG6DlxyjvqoHw=; b=ora7NYmiTYF2JOCyva2NyrNJLGiSQHkO5/DWwzC3rypo/zxWECZy6vPUjuWnxcyoh9 5JdUCAVluXUAz6ZjtAiywj5XsSKLQeF/fooSfzwTe8//rjzV71MovRKA5dgKsW5GdaaC NMf4UxTkbvPWTwQmUK+zEgXcBdJhA5f9wNdGZl/IWpeqdGfXg6gekA1YWv2RI3he01aV rSRYTArusinIjtesP9g5uKEERS1gEFFp4HuD4F67DTr+rCzRKvK70Go7u5cnjc1U7rPH 6g8X0EooWlQD0f+fm8V9i+xHr5hLuBP2SaLjwIDShKQiWb+25OENOcHaM4A84IlelOca +rRg== X-Gm-Message-State: AOAM533iP16KvCpgXzx9jqw4T4TOKOdeq1PYXiPa0Rzvb6OHOUQJTL5M +UmDKINN0gNTIOa93m55TWt5AL4OnvfMFqumUUj4IA== X-Google-Smtp-Source: ABdhPJy8cCZ9oT9uBMA6ACH2vLLvE83My3rHUrXgHIL8dqU1ksdB3gDA/0LyZ6iOZrlRI5zm7Dk9jTVm3ZdPjeFJGsA= X-Received: by 2002:aed:37e7:: with SMTP id j94mr10693345qtb.57.1590070878207; Thu, 21 May 2020 07:21:18 -0700 (PDT) MIME-Version: 1.0 References: <000000000000c866c705a61a95d4@google.com> <9a337dfa-175f-e13b-1977-0f63d589f37c@I-love.SAKURA.ne.jp> In-Reply-To: <9a337dfa-175f-e13b-1977-0f63d589f37c@I-love.SAKURA.ne.jp> From: Dmitry Vyukov Date: Thu, 21 May 2020 16:21:06 +0200 Message-ID: Subject: Re: INFO: task hung in locks_remove_posix To: Tetsuo Handa Cc: syzbot , syzkaller-bugs , LKML 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, May 21, 2020 at 4:09 PM Tetsuo Handa wrote: > > On 2020/05/21 5:53, syzbot wrote: > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: 806d8acc USB: dummy-hcd: use configurable endpoint naming .. > > git tree: https://github.com/google/kasan.git usb-fuzzer > > console output: https://syzkaller.appspot.com/x/log.txt?x=16c9ece2100000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=d800e9bad158025f > > dashboard link: https://syzkaller.appspot.com/bug?extid=f5bc30abd8916982419c > > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > > > Unfortunately, I don't have any reproducer for this crash yet. > > This seems to be a mislabeling due to '?' in all lines in a trace. > > #syz dup: INFO: task hung in wdm_flush It seems that unwind from __schedule is broken. Fixing the unwinder may be the action item here, otherwise we will get an infinite number of such reports.