From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.126.131]) by sourceware.org (Postfix) with ESMTPS id D0AF03858C27 for ; Mon, 25 Oct 2021 15:39:45 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org D0AF03858C27 Authentication-Results: sourceware.org; dmarc=fail (p=none dis=none) header.from=cygwin.com Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=cygwin.com Received: from calimero.vinschen.de ([24.134.7.25]) by mrelayeu.kundenserver.de (mreue011 [212.227.15.167]) with ESMTPSA (Nemesis) id 1Myb09-1mtP3S3aYf-00yz4I for ; Mon, 25 Oct 2021 17:39:43 +0200 Received: by calimero.vinschen.de (Postfix, from userid 500) id E6215A80F39; Mon, 25 Oct 2021 17:39:42 +0200 (CEST) Date: Mon, 25 Oct 2021 17:39:42 +0200 From: Corinna Vinschen To: cygwin-developers@cygwin.com Subject: Re: malloc crash Message-ID: Reply-To: cygwin-developers@cygwin.com Mail-Followup-To: cygwin-developers@cygwin.com References: <6a4d6675-7e4d-bcb3-9aff-acc0788d211d@cornell.edu> <97873b16-7ec3-02d7-1861-3ec62a79c37e@cornell.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <97873b16-7ec3-02d7-1861-3ec62a79c37e@cornell.edu> X-Provags-ID: V03:K1:U369nfKN1MANcmJC9lTPAaDzxbNfQuB1wYBKavjObuzo4FgUV8I QHvHTKjAudhdpbWsHD52P7HZl6EeJT9QJem2e18MC2PRmCG91kX/JGN+wKc7DGXpQtpH2jp FSIe38VOBXn6LvrF3y2Zvkkfj0v2RBJGCCvdU8fl6rNucp7KlcNX1ZBwR1pd1Q26siBzhx+ mVgFg+PoEMe5C3nGli2KA== X-UI-Out-Filterresults: notjunk:1;V03:K0:kvAJTqykzfo=:F5eEe4rq3m0eAU8P9L8cqJ vmaay3KMqq0SbB0CJmxYwVFWQokvXjK9NFjbbS8BRW5a8/ABuJRkpzaORr+QsjvZk9eWMPEh+ n1KNt9uwyQN3PTdCuHjdLFNcSPS1tYudddVCMapvIPaiMEVjFC0puqUhz7Zl43s0C6W/TuZAR fBwNPBVK+uDrhGl+tRgree3jSOkvJTUfdrMrXhCTY6PzWQbivIOr57hj1Cju1L+19BZJSc56P u55fUeMBHfhSWVKEGPJWtXirhlIk1f0pcy2rJ7GEfKamuUuV1rcY9eHliQ/9B2Sw9rcnaWDnr k5UyOZuFV4vUpAzC7gXdMSjf9Nq+vRNVpnmVEeHAWOLef1GlKjHnKy2XhG+f9xUTyLe5sgUa9 eofhlktS5u125a9z14JSHYk7wawAQJXi30BCiPzGusJklglYt/Rmi0up2CXnYCnavpxLJbYl1 ABfW3685WrZHG6pxNgZoxlZ784n6b9rEGScGSFMMgBJEgu8JKHkxBrmmKAQF2xOuvw+FHCvCy tI1l3ABTJSzcA6en35Rql7NY+RiYGsI9PZtbbbRYKaVIHVptYem14NcN1iPue1m4eP6Gcwkk2 HwM7M7CJU5I8a96nmxLWegRwTO5ZerD0I9qmYytKknu5qdZq9bEm+6v+wQTS/en/59lrFn2cD TiXYAOa7DQQLhg0l5RsizXJwYE34sdajp/wnBnhdPfzwiI/VUHSN3YwxHd13s5dfBMAzWp0un XR3qMsPpPX+MbSud X-Spam-Status: No, score=-99.4 required=5.0 tests=BAYES_00, GOOD_FROM_CORINNA_CYGWIN, JMQ_SPF_NEUTRAL, KAM_DMARC_NONE, KAM_DMARC_STATUS, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NEUTRAL, TXREP, WEIRD_PORT autolearn=ham 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-developers@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Cygwin core component developers mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Oct 2021 15:39:48 -0000 On Oct 25 08:35, Ken Brown wrote: > On 10/25/2021 4:59 AM, Corinna Vinschen wrote: > > Has the thread already been started at this point? > > Yes, here's the backtrace of that thread: > > Thread 5 (Thread 9692.0x7c4c): > #0 0x00000001801934f9 in sys_alloc (m=0x18036f860 <_gm_>, nb=1040) at > ../../../../temp/winsup/cygwin/malloc.cc:4232 > #1 0x0000000180196b96 in dlmalloc (bytes=1024) at > ../../../../temp/winsup/cygwin/malloc.cc:4669 > #2 0x00000001801993e1 in dlrealloc (oldmem=0x0, bytes=1024) at > ../../../../temp/winsup/cygwin/malloc.cc:5187 > #3 0x00000001800e8eed in realloc (p=0x0, size=1024) at > ../../../../temp/winsup/cygwin/malloc_wrapper.cc:73 Er... huh? So both threads are in a malloc function? This shouldn't have happened, given the clunky muto guarding malloc calls. This is really strange. Why's the muto not working here? Corinna