From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.126.134]) by sourceware.org (Postfix) with ESMTPS id DFBA53858D37 for ; Thu, 6 Aug 2020 11:46:11 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org DFBA53858D37 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=towo.net Authentication-Results: sourceware.org; spf=none smtp.mailfrom=towo@towo.net Received: from [192.168.178.45] ([95.90.245.244]) by mrelayeu.kundenserver.de (mreue010 [212.227.15.167]) with ESMTPSA (Nemesis) id 1M9FX5-1k8L371IO7-006MUs for ; Thu, 06 Aug 2020 13:46:10 +0200 Subject: Re: Race condition hangs on multiple mintty/tcsh? Brad Wetmore To: cygwin@cygwin.com References: <1988bd34-7a17-e70f-bf23-0044f30c8687@towo.net> <1193403444.420395.1596669799506@mail.yahoo.com> From: Thomas Wolff X-Tagtoolbar-Keys: D20200806134608208 Message-ID: Date: Thu, 6 Aug 2020 13:46:08 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <1193403444.420395.1596669799506@mail.yahoo.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K1:3izd4MfYF2ksBBacKN18CJD3Y+MhDEDQY06MIvNE2eJT+CRGcfj YnTu6nlfJPip/nJkCRBootmbXuZ1rICCLYw2gMKOMY4OTSedt4EVYnJBJULMn+qQRkpPFhU sOJ4m/llaGLc7Q5IZbAshmXgGiGLdqCwBrg81VqqmDJQQIWZxyvlK0K9Toy/t7YvyqqPcRq e8wukOmdfgguK9BYdT1Ow== X-UI-Out-Filterresults: notjunk:1;V03:K0:+iQ0j8hsNts=:zVbrXlY5Ujvh+XNUk3v/AS 7ScvEKwYoZeH3BnIlonCT5s7r9oSFfgXN5QjDwR0405flow8kLoF7gpp8npN3yvWqdGt+lAtA 42EbneUCocv1HdeheOspeIj8PQeLPWXJ7fmeDnomhVrsWhVgbZBVrp5Cb4EGudLieY3FDM562 DupCCz73fT4RWQf9qMAbBUXjFTV6x/qCibW16J8KTwe1pIPYVJL9b5Vis7ZRcI4cU8O7BJloL N7g+4OcSKRcS/TAz0oJTyO/kWHlzHLaSXuPZst2rJwGiqMKUSvT4R/TVNXR4SY3hZ+l/n9t45 rRJ9PcWcK/gw+qkj7iVPgQ5Z7rGwxM22iFL6ojXY03kbZlWWlgmsTdPUg/8+HbHjSmiPEbqlt dTC382T6uSeXS20qKq1TFEi9cHL4dLs9BQ82QLzRcMP0iGm35+RkhlwMz5Gs28D+qZMDQN8iM RS+X/eeOex77X5KDK9o5Bq6/k/z4MKy2+46apSsoloouQWQW7mU0xw6vXY1x80Gb9k5Hk38B1 4j+U3BosTOXttJZef5rg3SiG6f3p9lqLXT+YzJlPtfKfL3njicGYasQnbmkvt0WwXoHQrkHPc QI3hDeChPfuXQo+kxAO0+HyPUvSaETPOqHSO3PV6SrjDc1x4wMAqCiZQ2MZonBsIpsCuUomiT xbAp+z0tqYqGwkKucN31igMtEIurk7j5rsZMVquXdL+b8Rqm74XEHeArrcImWpVV9Dhp4Nrs7 HwR0pwTsdWEpxpBaSsca9fzyHdKVsdA2QeA0CMDQ1GC5mjwhywTbvKzTISwsvpDUlNVF795kX hCeoB6/N04HriiBo+UCWuDOja4wbDY7iih9yjZ5o7xZsitjNJXkYBtph4dBGPG14ZYVqPHD X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS, KAM_LAZY_DOMAIN_SECURITY, NICE_REPLY_A, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Aug 2020 11:46:13 -0000 Am 06.08.2020 um 01:23 schrieb Kevin Schnitzius via Cygwin: > On Wednesday, August 5, 2020, 06:56:48 PM EDT, Thomas Wolff wrote: >> Am 04.08.2020 um 12:02 schrieb Thomas Wolff: >>> Am 04.08.2020 um 00:13 schrieb Brad Wetmore via Cygwin: >>>> Hi, >>>> >>>> I generally kick off multiple (10) mintty sessions, and place them >>>> around the screen. >>>> >>>> C:/cygwin64/bin/mintty.exe -i /Cygwin-Terminal.ico \ >>> --position @3 --position 120,0 --size 80x71 /bin/tcsh & >>>> C:/cygwin64/bin/mintty.exe -i /Cygwin-Terminal.ico \ >>>> --position @3 --position 715,0 --size 80x45 /bin/tcsh & >>>> C:/cygwin64/bin/mintty.exe -i /Cygwin-Terminal.ico \ >>>> --position @3 --position 715,660 --size 80x24 /bin/tcsh & >>>> >>>> Within the last 6 months or so, about 2-3 of them would hang and >>>> either mintty/tcsh would not start. I put a "sleep 1" in between each >>>> invocation and that seemed to take care of it. >>>> >>>> With the latest cygwin update, about 8 of them just hang even with >>>> the sleep 1. I put in a "sleep 2", and now everything is coming up >>>> again. >>>> >>>> Not sure if this is a mintty or tcsh issue, but just wondering if >>>> others are seeing this before I start trying to debug this. >>> I can reproduce such behaviour with /bin/bash (easy cross-check), and >>> in fact the shell is running in that case (easy test via `echo > >>> .log`), so I have a vague and unpleasant suspicion it might in fact be >>> related to mintty although I have no idea how that would happen. To be >>> analysed. >> When in this state, on the pty from which mintty receives child process >> output, select() does not report a ready for reading condition; could it >> be related to the recent poll/select patch? I could not reproduce it in >> cygwin 3.0.7. > for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ; do mintty  -i /Cygwin-Terminal.ico  --position @3 --position 120,$i --size 80x24 /bin/bash & done > > This does not fail for me.  Nor does it fail from cmd or powershell using a script. > > I tried 3.1.4 and 3.1.6 on Windows 10.  I tried up to 100 instances of of mintty... Thanks for testing. It is in fact hard to reproduce, maybe also depending on system load (speculating). I could reproduce one case of one of three terminals being unresponsive also with xterm. Does anybody familiar with pty/select or recent changes have any idea? Thomas