From owner-freebsd-hackers@freebsd.org Thu Mar 14 13:31:17 2019 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id AC50C1543C14 for ; Thu, 14 Mar 2019 13:31:17 +0000 (UTC) (envelope-from darius@dons.net.au) Received: from ipmail06.adl2.internode.on.net (ipmail06.adl2.internode.on.net [150.101.137.129]) by mx1.freebsd.org (Postfix) with ESMTP id B8D4B77C31 for ; Thu, 14 Mar 2019 13:31:09 +0000 (UTC) (envelope-from darius@dons.net.au) Received: from 124-148-131-52.dyn.iinet.net.au (HELO midget.dons.net.au) ([124.148.131.52]) by ipmail06.adl2.internode.on.net with ESMTP; 15 Mar 2019 00:01:00 +1030 Received: from midget.dons.net.au (localhost [127.0.0.1]) by midget.dons.net.au (8.15.2/8.15.2) with ESMTPS id x2EDUiUd092847 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Fri, 15 Mar 2019 00:00:58 +1030 (ACDT) (envelope-from darius@dons.net.au) Received: (from mailnull@localhost) by midget.dons.net.au (8.15.2/8.15.2/Submit) id x2ED2vxd073554 for ; Thu, 14 Mar 2019 23:32:57 +1030 (ACDT) (envelope-from darius@dons.net.au) X-Authentication-Warning: midget.dons.net.au: mailnull set sender to using -f Received: from [10.0.2.26] ([10.0.2.26]) by ns.dons.net.au (envelope-sender ) (MIMEDefang) with ESMTP id x2ED2uTo073551; Thu, 14 Mar 2019 23:32:57 +1030 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.2 \(3445.102.3\)) Subject: Re: USB stack getting confused From: "O'Connor, Daniel" In-Reply-To: Date: Thu, 14 Mar 2019 23:32:56 +1030 Cc: Konstantin Belousov , FreeBSD Hackers Content-Transfer-Encoding: quoted-printable Message-Id: <01E69132-6EB6-4688-ADA2-FF62393F8DFA@dons.net.au> References: <3B29D870-41F9-46AF-B9F3-03106DEC417D@dons.net.au> <20190309152613.GM2492@kib.kiev.ua> <20190309162640.GN2492@kib.kiev.ua> <20190309192330.GO2492@kib.kiev.ua> <20190310094758.GP2492@kib.kiev.ua> <35f69493-4bbb-4142-b61a-3e90adc8777b@selasky.org> <20190310102629.GQ2492@kib.kiev.ua> <40bf77e0-47a5-6edc-b5d0-58e3c44988ac@selasky.org> <030A0C16-4508-4C7C-A87C-72B69B15EDF5@dons.net.au> <1BBD445B-9A27-4BE7-9B60-04BE0814D7CA@dons.net.au> <1692bbc5-02f4-d0e9-a290-219f045ff55b@selasky.org> <205EC4C0-810B-47C3-A21E-A1EE0A6E3824@dons.net.au> <991d10df-b42d-b557-1b47-37db5bfb4d42@selasky.org> To: Hans Petter Selasky X-Mailer: Apple Mail (2.3445.102.3) X-Spam-Score: -1 () No, score=-1.0 required=5.0 tests=ALL_TRUSTED autolearn=unavailable autolearn_force=no version=3.4.1 X-Scanned-By: MIMEDefang 2.83 on 10.0.2.1 X-Rspamd-Queue-Id: B8D4B77C31 X-Spamd-Bar: +++++ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [5.37 / 15.00]; MV_CASE(0.50)[]; HAS_XAW(0.00)[]; TO_DN_ALL(0.00)[]; MX_GOOD(-0.01)[midget.dons.net.au]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_IN_DNSWL_LOW(-0.10)[129.137.101.150.list.dnswl.org : 127.0.5.1]; R_DKIM_NA(0.00)[]; ASN(0.00)[asn:4739, ipnet:150.101.0.0/16, country:AU]; MIME_TRACE(0.00)[0:+]; MID_RHS_MATCH_FROM(0.00)[]; RECEIVED_SPAMHAUS_PBL(0.00)[52.131.148.124.zen.spamhaus.org : 127.0.0.11]; ARC_NA(0.00)[]; RCVD_COUNT_FIVE(0.00)[5]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; NEURAL_SPAM_SHORT(0.98)[0.984,0]; MIME_GOOD(-0.10)[text/plain]; IP_SCORE(1.02)[ip: (3.89), ipnet: 150.101.0.0/16(0.91), asn: 4739(0.32), country: AU(-0.04)]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; AUTH_NA(1.00)[]; DMARC_NA(0.00)[dons.net.au]; NEURAL_SPAM_MEDIUM(0.98)[0.976,0]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_SPAM_LONG(1.00)[1.000,0]; R_SPF_NA(0.00)[]; FREEMAIL_CC(0.00)[gmail.com] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Mar 2019 13:31:17 -0000 > On 14 Mar 2019, at 23:30, Hans Petter Selasky wrote: > On 3/11/19 2:41 PM, Hans Petter Selasky wrote: >>>=20 >>> I have the source code and I can see what the issue is so I'll fix = that, although I am surprised the limit for USB devices is so much lower = than the system limit for file descriptors generally. >>>=20 >> Hi, >> USB has a limit on open FD's per USB device, (USB_FIFO_MAX =3D 128) / = 2 =3D 64. >> --HPS >=20 > There can be up to 127 devices per USB controller, so 127 * 64 FDs is = the maximum allowed. I think the limit is reasonable, given that = non-admin users can have access to such devices. I suppose that makes sense, but the failure mode was pretty surprising = to me. I didn't realise that usbconfig has to open each device to get = information on it - I had assumed that it got it via /dev/usbctl or = similar. > Did you get any further on this issue? Sorry - yes I found the leak in my code. I thought I already said so but = obviously not. -- Daniel O'Connor "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum