From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on2138.outbound.protection.outlook.com [40.107.243.138]) by sourceware.org (Postfix) with ESMTPS id 583B8385DC1A for ; Tue, 7 Apr 2020 16:01:22 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 583B8385DC1A ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=N4gG5OYkRMMvXkPgRHAhaZiHMq9xUXaGrI2gR/YVq0poQkwgV7a6elQ+U4HL2u+myyRjw4ytttM/2Lse5T8kt3jzMvbjyn9N9WHloaUgWIEHLBKogGpAI/+xSkbT6Dq7YGMolbyvOYAmnW1QP0WMsCPJxUtq/Jh/HGhLXmlnUGgMGxTARSq71gqLGODcP7DvTJMIZNlBXKUKtE7T96/svZZQS+1L6KVBMJ6nFoC36c1lokjG1rievVNOnxStXcHp92mkbq2oLlHwxyI3zmQiPMmkR/C5U01DAiSoTiUIiRGbpb63umshBiJCdfF6izl97Ye/qS1mGtWB2mWvLn+Q+g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=9qEcbsnTm9K52N+phYl+Lf2a6Ha2K6TgvKue3aKr6ZE=; 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I can't reproduce this on my system. I changed 1000 to 10000 and then ran your test case 10 times, and it never failed. I tested both cygwin-3.1.4 and the HEAD of the topic/fifo branch (which I recently force-pushed in case you want to try it). Can you run your test under strace and see if that provides a clue? Ken