Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nKEUK-0002Ho-M5 for pgsql-hackers@arkaria.postgresql.org; Wed, 16 Feb 2022 07:12:32 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1nKEUI-0002jc-VT for pgsql-hackers@arkaria.postgresql.org; Wed, 16 Feb 2022 07:12:30 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nKEUI-0002jS-It for pgsql-hackers@lists.postgresql.org; Wed, 16 Feb 2022 07:12:30 +0000 Received: from mail-pf1-x435.google.com ([2607:f8b0:4864:20::435]) by makus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1nKEUG-0004Fz-3r for pgsql-hackers@postgresql.org; Wed, 16 Feb 2022 07:12:29 +0000 Received: by mail-pf1-x435.google.com with SMTP id i6so1421227pfc.9 for ; Tue, 15 Feb 2022 23:12:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=date:message-id:to:cc:subject:from:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=RW+ph80nitRxrblDw8WH8oVMnldUtwC6oSkzPCcaV/U=; b=prRl/lsT/ayHPf6SZxLkv3rBK0aiemGweQwZ7qj15hOumFo/hWk6kctAq+uASifyQD suzPz2fzGrC1M8iIEX1J3b8BsFyppxsuVznIQIPZGsUiZVQH9HccZ9tbYulSsoW8oRcJ G406mgUhVl/CKpwI5735UhQJrN3CQ876rt0rT3s8GSRdOs959c+RsJYQ8VJoqkYORYYz 9H/GD2AfPIIy3hxWjCyMQj8MVFhVra+txMys7BcQrw89ZWLxrWlcKJ0pVggLGDhfFIxQ 8P/YsvbgkiQ7Ien6zWSsbUr0BIydGH2hSSeyRPaIESPgVnMTKYdwLdtIqtD64/z/8Lj5 hhqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:message-id:to:cc:subject:from:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=RW+ph80nitRxrblDw8WH8oVMnldUtwC6oSkzPCcaV/U=; b=jOZ/1Yt4bAOclXVD5i2SUJmrUZeifS1duvkloEtJnYrmqdSYw209p3TeDZIQtcgtFP GxnshJZP3E52Wbw9sauCTXpQ2dVxqatYZGTJ4SXubW0lmzTnFL6/VxNPmSZoE2XgX/k0 TmMdxknb4XuLhYZJRkYg8tqZrYn9FuMVdszYV9olBz/enyEIUzOZqYd0GLADNKGsD5NG h16LzRt/+WaMAsctXonG3RnSyIxjbOIOVhaoCZrij3qT88XJ00uXLRgQuXYWxrSFaC5s IghLzS3aoVc4x5sojNm1kYjzdOsWdRdIHSOEZg61LUQqIzYM2Keg2mchL9C69MN8G0Tq /fZw== X-Gm-Message-State: AOAM533tSWHn8r1GKkA94N1Ko9fOzDRtgJggzan8xpauO9+rsCiE0758 F5HpKv6U2XURyCnKzEPdMn0= X-Google-Smtp-Source: ABdhPJxTkVli2vpsfa5NhetPEKjFr0ERTlshIrZuOovxZVKnfM1R7iqleSXp2anA4m8QdyPeDaY9aA== X-Received: by 2002:a63:1ca:0:b0:365:52ee:70fb with SMTP id 193-20020a6301ca000000b0036552ee70fbmr1178134pgb.19.1644995546750; Tue, 15 Feb 2022 23:12:26 -0800 (PST) Received: from localhost (KD036014041111.ppp-bb.dion.ne.jp. [36.14.41.111]) by smtp.gmail.com with ESMTPSA id h14sm47479511pfh.95.2022.02.15.23.12.24 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 15 Feb 2022 23:12:26 -0800 (PST) Date: Wed, 16 Feb 2022 16:12:24 +0900 (JST) Message-Id: <20220216.161224.1895701800767011322.horikyota.ntt@gmail.com> To: sawada.mshk@gmail.com Cc: andres@anarazel.de, hlinnaka@iki.fi, pgsql-hackers@postgresql.org Subject: Re: Race conditions in 019_replslot_limit.pl From: Kyotaro Horiguchi In-Reply-To: <20220216.152227.2011857448174448615.horikyota.ntt@gmail.com> References: <20220216.142637.1918987197255698649.horikyota.ntt@gmail.com> <20220216.152227.2011857448174448615.horikyota.ntt@gmail.com> User-Agent: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk At Wed, 16 Feb 2022 15:22:27 +0900 (JST), Kyotaro Horiguchi wrote in > At Wed, 16 Feb 2022 14:58:23 +0900, Masahiko Sawada wrote in > > Or it's possible that the process took a time to clean up the > > temporary replication slot? > > Checkpointer may take ReplicationSlotControlLock. Dead lock between > ReplicationSlotCleanup and InvalidateObsoleteReplicationSlots > happened? Or missing CV broadcast? Anyway I haven't find a scenario of interfering between checkpointer and walsender. regards. -- Kyotaro Horiguchi NTT Open Source Software Center