From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.ispras.ru (mail.ispras.ru [83.149.199.84]) by sourceware.org (Postfix) with ESMTPS id 317D73858D28 for ; Sat, 9 Apr 2022 16:07:11 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 317D73858D28 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=ispras.ru Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=ispras.ru Received: from mail.ispras.ru (unknown [83.149.199.84]) by mail.ispras.ru (Postfix) with ESMTPSA id 517B340D4004; Sat, 9 Apr 2022 16:07:08 +0000 (UTC) MIME-Version: 1.0 Date: Sat, 09 Apr 2022 19:07:08 +0300 From: Alexey Izbyshev To: Takashi Yano Cc: cygwin@cygwin.com Subject: Re: Deadlock of the process tree when running make In-Reply-To: <20220409204619.dd0e53902d5e108ef462e510@nifty.ne.jp> References: <9388316255ada0e0fcb2d849cce5a894@ispras.ru> <20220409191743.6da2268a36e8c9b4ab22c722@nifty.ne.jp> <1ecd670b1cdff43e0b0d7e5ee4c9cfc5@ispras.ru> <20220409204619.dd0e53902d5e108ef462e510@nifty.ne.jp> User-Agent: Roundcube Webmail/1.4.4 Message-ID: <907ce1b4416a826cb07990dd601bd687@ispras.ru> X-Sender: izbyshev@ispras.ru Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-0.1 required=5.0 tests=BAYES_00, DOS_RCVD_IP_TWICE_B, KAM_DMARC_STATUS, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) 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: Sat, 09 Apr 2022 16:07:13 -0000 On 2022-04-09 14:46, Takashi Yano wrote: > On Sat, 09 Apr 2022 14:02:38 +0300 > Alexey Izbyshev wrote: >> >> Missed the line in the link above: >> https://cygwin.com/git?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/fhandler_tty.cc;h=7bef6958c106c5e78cc90e014081022fd3a205bc;hb=cygwin-3_3_4-release#l1199 > > Thanks for finding that. It would be very helpfull if you could > find another process which holds pcon_mutex and where it is stopping. ProcessHacker showed that the owner of the pcon mutex is bash.exe with (Windows) PID 6276. However, Cygwin ps doesn't list such a process. Its parent, however, has a Cygwin PID 37961 and is in the hanging tree: make(32651)-+-make(32656)-+-bash(37296)---find(38057) | |-bash(37632)---find(38061) | |-bash(37415)---find(38064) | |-bash(37852)---find(38062) | |-bash(37896)---find(38063) | `-bash(37961)---javac(38032) `-make(32657)-+-bash(38025)---bash(38054)---bash(38055)---readlink(38056) `-bash(37722)---bash(37825)---bash(38058)-+-grep(38060) `-grep(38059) Since javac(38032) is a zombie, my guess is that missing bash.exe (win 6276) is an intermediate process that Cygwin created when bash(37961) forked to run javac. bash.exe (win 6276) has two threads. The first one is blocked at ClosePseudoConsole() (which according to stack trace eventually calls NtWaitForSingleObject()) [1] and the second one is at [2]. [1] https://cygwin.com/git?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/fhandler_tty.cc;h=7bef6958c106c5e78cc90e014081022fd3a205bc;hb=cygwin-3_3_4-release#l3615 [2] https://cygwin.com/git?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/sigproc.cc;h=02d875a7fc947d628ca933690ed43ef03d767d53;hb=cygwin-3_3_4-release#l1359 Hope this is helpful, Alexey