From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 43690CA5FF0 for ; Mon, 5 Oct 2026 12:05:23 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1xDhRN-00051j-2K; Mon, 05 Oct 2026 08:05:11 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1xDhQz-00050Q-7k for qemu-devel@nongnu.org; Mon, 05 Oct 2026 08:04:46 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1xDhQx-0003n3-JU for qemu-devel@nongnu.org; Mon, 05 Oct 2026 08:04:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1791201881; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=yYwHnlmZYlzCh5qkAjnXvYra3zgQiPztuA5d2BgTr88=; b=Ig8BmwbYLyhg3j+ruV4UmxUEqrO5kFvwVev2WXQVamFZ6w3qRlnSQTvabkPdeTPZzdcA3Z pX53JdR+BQU8fVTJKEWEG4irYycsS/zKMPyX8+4oFKyEV5Yt86kp/OE+HINqt04Mm7rcqI Ny3+m4EnpTw9Zkd0zkVcj9VvLPr4SS8= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-577-SnZnFbTMMdiJyNwL4cyE6g-1; Mon, 05 Oct 2026 08:04:38 -0400 X-MC-Unique: SnZnFbTMMdiJyNwL4cyE6g-1 X-Mimecast-MFC-AGG-ID: SnZnFbTMMdiJyNwL4cyE6g_1791201877 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id ECE8F1800677; Mon, 5 Oct 2026 12:04:36 +0000 (UTC) Received: from berrange.csb (headnet03.pony-001.prod.iad2.dc.redhat.com [10.2.32.114]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 969661800581; Mon, 5 Oct 2026 12:04:35 +0000 (UTC) From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: Fabiano Rosas , Paolo Bonzini , Laurent Vivier , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH] qtest: fail fast when QEMU terminates early Date: Mon, 5 Oct 2026 13:04:34 +0100 Message-ID: <20261005120434.413891-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.24, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org If QEMU fails to start, or crashes early, before libqtest has opened its qtest and QMP sockets, we'll get into an 'accept()' call with a 50 second timeout waiting for a connection that the zombie QEMU process will never initiate. Use a short 250ms timeout with accept(), but loop 200 times instead, checking whether the process is alive on each iteration. With this qtest detects dead QEMU immediately. socket_accept is renamed to qtest_socket_accept to reflect that it now requires QTestState. Signed-off-by: Daniel P. Berrangé --- tests/qtest/libqtest.c | 45 ++++++++++++++++++++++++++---------------- 1 file changed, 28 insertions(+), 17 deletions(-) diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c index 05d88476154..9e7a2d43a18 100644 --- a/tests/qtest/libqtest.c +++ b/tests/qtest/libqtest.c @@ -44,13 +44,14 @@ #define MAX_IRQ 256 +#define ACCEPT_TIMEOUT_MS 250 +#define ACCEPT_RETRIES (4 * 50) + #ifndef _WIN32 -# define SOCKET_TIMEOUT 50 # define CMD_EXEC "exec " # define DEV_STDERR "/dev/fd/2" # define DEV_NULL "/dev/null" #else -# define SOCKET_TIMEOUT 50000 # define CMD_EXEC "" # define DEV_STDERR "2" # define DEV_NULL "nul" @@ -116,20 +117,17 @@ static int init_socket(const char *socket_path) return sock; } -static int socket_accept(int sock) +static int qtest_socket_accept(QTestState *s, int sock) { struct sockaddr_un addr; socklen_t addrlen; int ret; - /* - * timeout unit of blocking receive calls is different among platforms. - * It's in seconds on non-Windows platforms but milliseconds on Windows. - */ + size_t i; #ifndef _WIN32 - struct timeval timeout = { .tv_sec = SOCKET_TIMEOUT, - .tv_usec = 0 }; + struct timeval timeout = { .tv_sec = 0, + .tv_usec = ACCEPT_TIMEOUT_MS * 1000ul }; #else - DWORD timeout = SOCKET_TIMEOUT; + DWORD timeout = ACCEPT_TIMEOUT_MS; #endif if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, @@ -140,13 +138,26 @@ static int socket_accept(int sock) return -1; } - do { + for (i = 0; i < ACCEPT_RETRIES ; i++) { + if (!qtest_probe_child(s)) { + fprintf(stderr, + "child process unexpectedly exited, skipping socket accept\n"); + goto cleanup; + } + addrlen = sizeof(addr); ret = accept(sock, (struct sockaddr *)&addr, &addrlen); - } while (ret == -1 && errno == EINTR); - if (ret == -1) { - fprintf(stderr, "%s failed: %s\n", __func__, strerror(errno)); + if (ret == -1) { + if (errno == EINTR || errno == EAGAIN) { + continue; + } else { + fprintf(stderr, "%s failed: %s\n", __func__, strerror(errno)); + } + } + return ret; } + + cleanup: close(sock); return ret; @@ -549,9 +560,9 @@ void qtest_connect(QTestState *s) g_autofree gchar *qmp_socket_path = qtest_socket_path("qmp"); g_assert(s->sock >= 0 && s->qmpsock >= 0); - s->fd = socket_accept(s->sock); + s->fd = qtest_socket_accept(s, s->sock); if (s->fd >= 0) { - s->qmp_fd = socket_accept(s->qmpsock); + s->qmp_fd = qtest_socket_accept(s, s->qmpsock); } unlink(socket_path); unlink(qmp_socket_path); @@ -663,7 +674,7 @@ QTestState *qtest_init_with_serial(const char *extra_args, int *sock_fd) qts = qtest_initf("-chardev socket,id=s0,path=%s -serial chardev:s0 %s", sock_path, extra_args); - *sock_fd = socket_accept(sock_fd_init); + *sock_fd = qtest_socket_accept(qts, sock_fd_init); unlink(sock_path); g_free(sock_path); -- 2.55.0