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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.155.12; envelope-from=raphael.norwitz@nutanix.com; helo=mx0b-002c1b01.pphosted.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.391, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "qemu-devel@nongnu.org" , Raphael Norwitz , "stefanha@redhat.com" , "pbonzini@redhat.com" , "mreitz@redhat.com" , "sgarzare@redhat.com" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1630936018460100001 Content-Type: text/plain; charset="utf-8" In the vhost-user-blk-test, as of now there is nothing stoping vhost-user-blk in QEMU writing to the socket right after forking off the storage daemon before it has a chance to come up properly, leaving the test hanging forever. This intermittently hanging test has caused QEMU automation failures reported multiple times on the mailing list [1]. This change makes the storage-daemon notify the vhost-user-blk-test that it is fully initialized and ready to handle client connections by creating a pidfile on initialiation. This ensures that the storage-daemon backend won't miss vhost-user messages and thereby resolves the hang. [1] https://lore.kernel.org/qemu-devel/CAFEAcA8kYpz9LiPNxnWJAPSjc=3Dnv532bE= dyfynaBeMeohqBp3A@mail.gmail.com/ Signed-off-by: Raphael Norwitz --- tests/qtest/vhost-user-blk-test.c | 33 ++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) diff --git a/tests/qtest/vhost-user-blk-test.c b/tests/qtest/vhost-user-blk= -test.c index 6f108a1b62..78140e6f28 100644 --- a/tests/qtest/vhost-user-blk-test.c +++ b/tests/qtest/vhost-user-blk-test.c @@ -24,6 +24,9 @@ #define TEST_IMAGE_SIZE (64 * 1024 * 1024) #define QVIRTIO_BLK_TIMEOUT_US (30 * 1000 * 1000) #define PCI_SLOT_HP 0x06 +#define PIDFILE_RETRIES 5 + +const char *pidfile_format =3D "/tmp/daemon-%d"; =20 typedef struct { pid_t pid; @@ -885,7 +888,8 @@ static void start_vhost_user_blk(GString *cmd_line, int= vus_instances, int num_queues) { const char *vhost_user_blk_bin =3D qtest_qemu_storage_daemon_binary(); - int i; + int i, err, retries; + char *daemon_pidfile_path; gchar *img_path; GString *storage_daemon_command =3D g_string_new(NULL); QemuStorageDaemonState *qsd; @@ -898,6 +902,12 @@ static void start_vhost_user_blk(GString *cmd_line, in= t vus_instances, " -object memory-backend-memfd,id=3Dmem,size=3D256M,share=3Don= " " -M memory-backend=3Dmem -m 256M "); =20 + err =3D asprintf(&daemon_pidfile_path, pidfile_format, getpid()); + if (err =3D=3D -1) { + fprintf(stderr, "Failed to format storage-daemon pidfile name %m"); + abort(); + } + for (i =3D 0; i < vus_instances; i++) { int fd; char *sock_path =3D create_listen_socket(&fd); @@ -914,6 +924,9 @@ static void start_vhost_user_blk(GString *cmd_line, int= vus_instances, i + 1, sock_path); } =20 + g_string_append_printf(storage_daemon_command, "--pidfile %s", + daemon_pidfile_path); + g_test_message("starting vhost-user backend: %s", storage_daemon_command->str); pid_t pid =3D fork(); @@ -930,7 +943,25 @@ static void start_vhost_user_blk(GString *cmd_line, in= t vus_instances, execlp("/bin/sh", "sh", "-c", storage_daemon_command->str, NULL); exit(1); } + + /* + * Ensure the storage-daemon has come up properly before allowing the + * test to proceed. + */ + retries =3D 0; + while (access(daemon_pidfile_path, F_OK) !=3D 0) { + if (retries > PIDFILE_RETRIES) { + fprintf(stderr, "The storage-daemon failed to come up after %d= " + "seconds - killing the test", PIDFILE_RETRIES); + abort(); + } + + retries++; + usleep(1000); + } + g_string_free(storage_daemon_command, true); + free(daemon_pidfile_path); =20 qsd =3D g_new(QemuStorageDaemonState, 1); qsd->pid =3D pid; --=20 2.20.1