From nobody Wed Jul 28 00:55:59 2021 X-Original-To: freebsd-hackers@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id E8BE212BB09A; Wed, 28 Jul 2021 00:56:16 +0000 (UTC) (envelope-from rozhuk.im@gmail.com) Received: from mail-lj1-x231.google.com (mail-lj1-x231.google.com [IPv6:2a00:1450:4864:20::231]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4GZFbM6x45z3LG3; Wed, 28 Jul 2021 00:56:15 +0000 (UTC) (envelope-from rozhuk.im@gmail.com) Received: by mail-lj1-x231.google.com with SMTP id a7so963440ljq.11; Tue, 27 Jul 2021 17:56:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:date:to:cc:subject:message-id:mime-version :content-transfer-encoding; bh=DCZeM1CKwiypSoWOdUXjCSR2nfKyUeRVNx+WMtfsmio=; b=pGBqprsQm2KD6+yThBleYUPrQ0bQ95CgzloyHs42ke5HgzwXAx0dDgv92MEUCuwri2 zPVJx+vSfpAgXS4qr8PmD/9gY7wrWl4JY3F24DI+jfkWKbUcnRDUpvkUVI8X8Vb01fVc hOGmBj6U9jicEr2+/7PEhWNwx5OUz6FBhdizRYK2wpfryqBe3mgbxKDmXGy6JiMCNxr3 XJI9Xq6QWMDOorKooOn9kP1Nt2YQFJVrkJN8GoH4M1KIFyUkefl+eOp7ezZzxX4E9rLt ABHQ0zUXolgE732sjcf2ADjqbVexW/Aq+yaO1vxv7qGZW6ZsBXNeIhT/WKYKTKYyzOaj +YAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:to:cc:subject:message-id:mime-version :content-transfer-encoding; bh=DCZeM1CKwiypSoWOdUXjCSR2nfKyUeRVNx+WMtfsmio=; b=ZQ6GlLdOBaCP9qwL0wBBBtBfgM1QcMdvsJqDHuevRpOMCV8gxPtrvDxEFPdVAygJli KbclLZbszoydKSdX7MFcw5ZVgcS4w3bS+0Q9uwzmsR6B/CZnvSElLTPocekVr3pDIJTK 1ugiWIlPeLuCi4EsWkEuaLCHCQ0lEym/8dH2S9yqrLTgrylzsmTis1Mh/gHN4PfG6ija XJAV0Bjmg8069EfiZUimJpG2+B2ZB/+sgO7sQnOjk5a8pDsGG/QXBaw8E1iL18nV3IE5 qSM1TzHJFtYqo/FMpT/tkDW9qc72WjTSJkNHo9gNPscoCtbvshZevZn4ePIoBrlvkw2w WByw== X-Gm-Message-State: AOAM531EJ6h6h2SOoqx2bHClEtR3FazECvR9o6x0P6RfZ53Pkh8DNuQU /3ZLUK6rhkWVTrlqW2Usm0IxjWVASdc= X-Google-Smtp-Source: ABdhPJx6a0Yy2V2S7WAt6b16weuzJh/apsbvh3VSdUXrlIUgtxZVrrYmj/530tf59eKsCWt2w5Kc9Q== X-Received: by 2002:a2e:a90b:: with SMTP id j11mr17507856ljq.338.1627433769211; Tue, 27 Jul 2021 17:56:09 -0700 (PDT) Received: from rimwks.local ([176.99.169.245]) by smtp.gmail.com with ESMTPSA id z13sm432865lfd.49.2021.07.27.17.56.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 17:56:08 -0700 (PDT) From: Rozhuk Ivan X-Google-Original-From: Rozhuk Ivan Date: Wed, 28 Jul 2021 03:55:59 +0300 To: freebsd-hackers@freebsd.org, freebsd-current@freebsd.org Cc: Rozhuk Ivan Subject: pthread_mutex_lock(), EDEADLK and thread ID Message-ID: <20210728035559.3b885fb9@rimwks.local> X-Mailer: Claws Mail 3.18.0 (GTK+ 2.24.33; amd64-portbld-freebsd13.0) List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4GZFbM6x45z3LG3 X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=pGBqprsQ; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of rozhukim@gmail.com designates 2a00:1450:4864:20::231 as permitted sender) smtp.mailfrom=rozhukim@gmail.com X-Spamd-Result: default: False [-2.00 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36:c]; FREEMAIL_FROM(0.00)[gmail.com]; TAGGED_RCPT(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_SOME(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::231:from]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; TAGGED_FROM(0.00)[]; MAILMAN_DEST(0.00)[freebsd-hackers,freebsd-current]; FREEMAIL_CC(0.00)[gmail.com] X-ThisMailContainsUnwantedMimeParts: N Hi! We have some product based on FreeBSD 12.2 that running in different places and environments, more than 5 years. At one place we got EDEADLK some times then calling pthread_mutex_lock(). This happen to often: 1-4 times per 10 minutes. Code designed to call abort() and generate coredump. So we mostly sure that this was not happen in other places in past. I know that we run as VmWare guest and can ask more details. In lib/libthr/thread/thr_mutex.c ... static int mutex_lock_sleep(struct pthread *curthread, struct pthread_mutex *m, const struct timespec *abstime) { uint32_t id, owner; int count, ret; id = TID(curthread); if (PMUTEX_OWNER_ID(m) == id) return (mutex_self_lock(m, abstime)); .... mutex_self_lock() may return EDEADLK for PTHREAD_MUTEX_ERRORCHECK mutex type, which is default. Is it possible that "id = TID(_get_curthread());" some how changed to ID some other thread that lock mutex in past?