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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76CD2C433F5 for ; Wed, 30 Mar 2022 03:02:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234295AbiC3DDw (ORCPT ); Tue, 29 Mar 2022 23:03:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242191AbiC3DDu (ORCPT ); Tue, 29 Mar 2022 23:03:50 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 2CF63B716F for ; Tue, 29 Mar 2022 20:02:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1648609325; 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=xxzvoUYwD8SSYfs6qQXKCiAwI4oUDxgTEMP9uTO4mCk=; b=UIOYWg6+zRDpv4BAtKC+2yw5ck9gch3swMJ8yjCLZOLrO6DVXRf3MiYHuybLH7a1fVhlmu JC7DbJOS0VRJAZOSFxd4VxRcpH2j+CGGYZStq6SylhkiZ4BC1NWUGcksKejdJVHP24C4lo 5geOcw8tBpIOYy53fmNLDg77hl+HmSI= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-32-OWISo9TON5mPeQ0u3-hOeQ-1; Tue, 29 Mar 2022 23:01:59 -0400 X-MC-Unique: OWISo9TON5mPeQ0u3-hOeQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6541029DD991; Wed, 30 Mar 2022 03:01:59 +0000 (UTC) Received: from T590 (ovpn-8-29.pek2.redhat.com [10.72.8.29]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 69D652166B3F; Wed, 30 Mar 2022 03:01:45 +0000 (UTC) Date: Wed, 30 Mar 2022 11:01:40 +0800 From: Ming Lei To: syzbot Cc: axboe@kernel.dk, cgroups@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tj@kernel.org Subject: Re: [syzbot] possible deadlock in throtl_pending_timer_fn Message-ID: References: <0000000000009518f205db66a47a@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000009518f205db66a47a@google.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Tue, Mar 29, 2022 at 07:52:57PM -0700, syzbot wrote: > > On Wed, Mar 30, 2022 at 5:23 AM syzbot > > wrote: > >> > >> Hello, > >> > >> syzbot found the following issue on: > >> > >> HEAD commit: cb7cbaae7fd9 Merge tag 'drm-next-2022-03-25' of git://anon.. > >> git tree: upstream > >> console output: https://syzkaller.appspot.com/x/log.txt?x=17ef8b43700000 > >> kernel config: https://syzkaller.appspot.com/x/.config?x=7094767cefc58fb9 > >> dashboard link: https://syzkaller.appspot.com/bug?extid=934ebb67352c8a490bf3 > >> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > >> > >> Unfortunately, I don't have any reproducer for this issue yet. > >> > >> IMPORTANT: if you fix the issue, please add the following tag to the commit: > >> Reported-by: syzbot+934ebb67352c8a490bf3@syzkaller.appspotmail.com > > > > #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git > > This crash does not have a reproducer. I cannot test it. This one is triggered in case of memory allocation failure, especially blkg_free() is called from blkg_alloc() directly. That is why it is hard to reproduce, and it is one old issue. Thanks, Ming