Received: by 2002:a05:6a10:6744:0:0:0:0 with SMTP id w4csp5029052pxu; Tue, 13 Oct 2020 12:56:20 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxnJBvFpbldxxvuTSGr1tGoBR/0lvNITkX0zFgC40BqXGiAT5j9sIrmfeEoG513nzJigkug X-Received: by 2002:a17:906:7f8c:: with SMTP id f12mr1580434ejr.8.1602618980574; Tue, 13 Oct 2020 12:56:20 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1602618980; cv=none; d=google.com; s=arc-20160816; b=YzZWixN/iSwveTC9xF+0PYQfFzuDy0VRZNOlX+tHeMXck0v3vA0CvC41M1RWS7r3Ca zocHhwu4499GzZwR1bJpBnNVwbtbuKf23D+bCKa8gV+P2zbgKRkFzLPzXlLUP0NPWWqW Tqgtdky4gRKNSxSGsD9h4ky9fut9hlYKASfWcMi7Oleu4omuNri1M9jw9QboyT5iXPi4 Q5hpWUF0uKrblegXh7Kr4i5yQmO61sKehu42vwf1LqZO+dXFMCHUQ5fJFLskldJe7diA mrS2MQxl21g3xJ0z4oK4pXUPsZw/I9dyr6MvWpOlbFOFRwsuSWhnPq1hoDWxtokZ6rfv KlUA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:date:cc:to:from:subject:message-id :dkim-signature; bh=r8ZV+rYkGeSUFu36KKN8YPgpFKIbE9gDjxNbUNZQHuw=; b=eBgD+l/4dvnyD2diIqMsidkvdUmG97R+btbTzP3kWJsAA+nNwVsozeK6e6dLYSmLMP CU31nR/tkUPX8N+hoofb2mWcmQww7Sla2iHl+HEoQJNGB3JZ2klSnU1lleSsdp4nc6GS LVU7kAGKd6xmIpzq1bCqPM1DQjtAqmJoEpFydYVywsomIfEXRiZpiGft68PvOa7X0SeI 2scy/AFTmyT8oJ9Eofd4vHPdl0Jy/fxT3YLrHB7adMbc4y9DkdRn6WewdYuQPe3R9kWZ 60V1hhLoDcxLGwMNlMvgx/XFgcU6sCtcrXdtJ6IwNamm2mIr4JFxn8qBaR51Bj+mrqMH s/uw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=N2Cx7XIR; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id d4si617251edo.178.2020.10.13.12.55.57; Tue, 13 Oct 2020 12:56:20 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=N2Cx7XIR; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727986AbgJMTxl (ORCPT + 99 others); Tue, 13 Oct 2020 15:53:41 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:50709 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726476AbgJMTxk (ORCPT ); Tue, 13 Oct 2020 15:53:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1602618819; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=r8ZV+rYkGeSUFu36KKN8YPgpFKIbE9gDjxNbUNZQHuw=; b=N2Cx7XIRVsThMw1w2CJYXtcB3y1tGim+OM8kHiUdX7MvdYuflyT5CsQAAxqh3RAmfSFz7W cW5W3ayuOi+tvymBBAV/HJ6e2ldXpPquaY6aO4gz1jZas04C94h6jXrUHUbt48tZjpzGXK fBTKb6+WtGk8eFmjsvoYbUpUxelOZmY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-354-uMFhaWd5PtiNzlJ5-7N3Qg-1; Tue, 13 Oct 2020 15:53:33 -0400 X-MC-Unique: uMFhaWd5PtiNzlJ5-7N3Qg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C92DA800683; Tue, 13 Oct 2020 19:53:31 +0000 (UTC) Received: from ovpn-118-16.rdu2.redhat.com (ovpn-118-16.rdu2.redhat.com [10.10.118.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id BCA0E73664; Tue, 13 Oct 2020 19:53:24 +0000 (UTC) Message-ID: Subject: Re: Unbreakable loop in fuse_fill_write_pages() From: Qian Cai To: Vivek Goyal Cc: Miklos Szeredi , Alexander Viro , Stefan Hajnoczi , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, virtio-fs@redhat.com Date: Tue, 13 Oct 2020 15:53:19 -0400 In-Reply-To: <20201013185808.GA164772@redhat.com> References: <7d350903c2aa8f318f8441eaffafe10b7796d17b.camel@redhat.com> <20201013184026.GC142988@redhat.com> <20201013185808.GA164772@redhat.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2020-10-13 at 14:58 -0400, Vivek Goyal wrote: > I am wondering if virtiofsd still alive and responding to requests? I > see another task which is blocked on getdents() for more than 120s. > > [10580.142571][ T348] INFO: task trinity-c36:254165 blocked for more than 123 > +seconds. > [10580.143924][ T348] Tainted: G O 5.9.0-next-20201013+ #2 > [10580.145158][ T348] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > +disables this message. > [10580.146636][ T348] task:trinity-c36 state:D stack:26704 pid:254165 > ppid: > +87180 flags:0x00000004 > [10580.148260][ T348] Call Trace: > [10580.148789][ T348] __schedule+0x71d/0x1b50 > [10580.149532][ T348] ? __sched_text_start+0x8/0x8 > [10580.150343][ T348] schedule+0xbf/0x270 > [10580.151044][ T348] schedule_preempt_disabled+0xc/0x20 > [10580.152006][ T348] __mutex_lock+0x9f1/0x1360 > [10580.152777][ T348] ? __fdget_pos+0x9c/0xb0 > [10580.153484][ T348] ? mutex_lock_io_nested+0x1240/0x1240 > [10580.154432][ T348] ? find_held_lock+0x33/0x1c0 > [10580.155220][ T348] ? __fdget_pos+0x9c/0xb0 > [10580.155934][ T348] __fdget_pos+0x9c/0xb0 > [10580.156660][ T348] __x64_sys_getdents+0xff/0x230 > > May be virtiofsd crashed and hence no requests are completing leading > to a hard lockup? Virtiofsd is still working. Once this happened, I manually create a file on the guest (in virtiofs) and then I can see the content of it from the host.