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[23.128.96.18]) by mx.google.com with ESMTP id fx8si11744681ejb.481.2021.03.22.09.17.05; Mon, 22 Mar 2021 09:17:27 -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=FssBN15e; 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 S230134AbhCVQQK (ORCPT + 99 others); Mon, 22 Mar 2021 12:16:10 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:28223 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231243AbhCVQPi (ORCPT ); Mon, 22 Mar 2021 12:15:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1616429737; 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=d9xW4e0ABDahCGPtlmhy6o9ZXwjtcaGWiPhqlG3tVgw=; b=FssBN15e0vPQ0x2BVWaHyFeOlxTqjVrCxtJ9RS/hR9iz45IEl9dwzmcs+Uj4HIsyI9rVs2 MWE9UskB2qnAbB80ezhepwlWqkzjD9zXQVD0Ch5DGU8RQvETRZIWTJ827SffJngCzMgc5A 0Sr1acQTzm7oHIJgLNhSCsBFS2uoqkw= 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-575-Y8-CQZiGMeOGX6cLjLR5tA-1; Mon, 22 Mar 2021 12:15:35 -0400 X-MC-Unique: Y8-CQZiGMeOGX6cLjLR5tA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 105E0108BD0C; Mon, 22 Mar 2021 16:15:33 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.40.194.114]) by smtp.corp.redhat.com (Postfix) with SMTP id 141885B6AB; Mon, 22 Mar 2021 16:15:30 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Mon, 22 Mar 2021 17:15:32 +0100 (CET) Date: Mon, 22 Mar 2021 17:15:29 +0100 From: Oleg Nesterov To: Jens Axboe Cc: io-uring@vger.kernel.org, torvalds@linux-foundation.org, ebiederm@xmission.com, linux-kernel@vger.kernel.org, Stefan Metzmacher Subject: Re: [PATCH 2/2] signal: don't allow STOP on PF_IO_WORKER threads Message-ID: <20210322161529.GB20390@redhat.com> References: <20210320153832.1033687-1-axboe@kernel.dk> <20210320153832.1033687-3-axboe@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210320153832.1033687-3-axboe@kernel.dk> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/20, Jens Axboe wrote: > > --- a/kernel/signal.c > +++ b/kernel/signal.c > @@ -2349,6 +2349,10 @@ static bool do_signal_stop(int signr) > > t = current; > while_each_thread(current, t) { > + /* don't STOP PF_IO_WORKER threads */ > + if (t->flags & PF_IO_WORKER) > + continue; > + This is not enough. At least task_join_group_stop() should check PF_IO_WORKER too. Oleg.