From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8A54BF507 for ; Sun, 23 Mar 2025 19:47:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742759269; cv=none; b=oqhAUkmo31xv7/UCTj3cpKtKmk1aK8KHLq6jZCl76X1v6ui+5T2rMWCHfQlBjgaH+D0WpZVIwXQ/06x9kxi4JNVvssT+TfoKL8/UC5Foics1/z8PSuDjH8SMVeD/zylyUIIYFKFAbns1YrM8iQBGmp0ItsokQL/DgM0RPVO4QHY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742759269; c=relaxed/simple; bh=iUR3681lmcQ8e6lNQBa94X6U9ui9TWzgm3USzDftaHU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=u8HGsJAIwP4PzQVaQyg+T+BRpUtzKALE086hPaCofAjkFMIJdybfxyvmBKKpvJCFDg/5XPyCoMp/dkEaZq3m8dB6l7M9EIO5MPlsKFS18zt8FIp9x4/diHFm20flEx8pquuJ9uGgHM3eRMAuU5gNWbAj3qZoHIF91OO40n4LO0Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=KA7UFNDy; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="KA7UFNDy" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1742759266; 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: in-reply-to:in-reply-to:references:references; bh=iUR3681lmcQ8e6lNQBa94X6U9ui9TWzgm3USzDftaHU=; b=KA7UFNDylyslgnq0aEs3TTCnJJSrXY72AkV+plL/VHdMux8MlL9UkIq23AGBFOgUTQg1+k GZQSQwAg6ewC/GSneZfinziX/E7k/nEt0s/V43TojzDyIv5fC89SfEuO4wyJ9ryETY4hVL 360+2WmSaap4HQ/RWRf/B9nirVwND6g= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-690-MbqQq6QfOPCwiRx3qmyF7g-1; Sun, 23 Mar 2025 15:47:43 -0400 X-MC-Unique: MbqQq6QfOPCwiRx3qmyF7g-1 X-Mimecast-MFC-AGG-ID: MbqQq6QfOPCwiRx3qmyF7g_1742759261 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0EB56196D2CC; Sun, 23 Mar 2025 19:47:41 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.45.224.42]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id 2FC6F30001A1; Sun, 23 Mar 2025 19:47:35 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Sun, 23 Mar 2025 20:47:08 +0100 (CET) Date: Sun, 23 Mar 2025 20:47:02 +0100 From: Oleg Nesterov To: syzbot Cc: brauner@kernel.org, dhowells@redhat.com, jack@suse.cz, jlayton@kernel.org, kprateek.nayak@amd.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, mjguzik@gmail.com, netfs@lists.linux.dev, swapnil.sapkal@amd.com, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Subject: Re: [syzbot] [netfs?] INFO: task hung in netfs_unbuffered_write_iter Message-ID: <20250323194701.GC14883@redhat.com> References: <20250323184848.GB14883@redhat.com> <67e05e30.050a0220.21942d.0003.GAE@google.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <67e05e30.050a0220.21942d.0003.GAE@google.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 On 03/23, syzbot wrote: > > Hello, > > syzbot has tested the proposed patch but the reproducer is still triggering an issue: > INFO: task hung in netfs_unbuffered_write_iter OK, as expected. Dear syzbot, thank you. So far I think this is another problem revealed by aaec5a95d59615523db03dd5 ("pipe_read: don't wake up the writer if the pipe is still full"). I am going to forget about this report for now and return to it later, when all the pending pipe-related changes in vfs.git are merged. Oleg.