From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2133.outbound.protection.outlook.com [40.107.236.133]) by sourceware.org (Postfix) with ESMTPS id BA0E6385E009 for ; Thu, 26 Mar 2020 22:39:28 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org BA0E6385E009 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=QgvN0Vj9sXAfEAZb1+rkNNOygRhyZ/KfCd2vUYQl44eg7U5T6ySfQoJ8zcI8idB+H2vDBuXuRy1nv1N2zBuo0B/RvXloIwyabzmeKXg5Ws/jOXRQ51Ly6HVipgn97InJnROViFHXNZW+9vDoBdgZFGvX+dQ0HEaFJJ7QgDohT5/d2D9dfFr/QuHFs81cIAc/iTGaI1Ac17T/prGJGpgOjDMJsGC2Rfm5mqFb/bb9SiFe80YBEdpA+Cs4dCSdMBqVzM8QzgIJKdYi9T8r9abSntw2U1Mqtux238HnIuVYgL1AAmjPpswqFcnjC3k96K4a4C9k8fV6/m32XkDIeuQoAw== 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=xWzfkqEwGKaraUt0ZfsZMZa4mWdwrfnEv8PQRX8o5bs=; 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This is consistent with my guess that the error is generated by fhandler_fifo::wait. I have a feeling that read_ready should have been created as a manual-reset event, and that more care is needed to make sure it's set when it should be. > I could provide a code-snippet > to reproduce it if wanted ? Yes, please! Ken