Re: [PULL 10/38] tests/qtest/migration: Add a test for the analyze-migration script

["Alex Bennée" <alex.bennee@linaro.org>]

Juan Quintela <quintela@redhat.com> writes:

> From: Fabiano Rosas <farosas@suse.de>
>
> Add a smoke test that migrates to a file and gives it to the
> script. It should catch the most annoying errors such as changes in
> the ram flags.
>
> After code has been merged it becomes way harder to figure out what is
> causing the script to fail, the person making the change is the most
> likely to know right away what the problem is.
>
> Signed-off-by: Fabiano Rosas <farosas@suse.de>
> Acked-by: Thomas Huth <thuth@redhat.com>
> Reviewed-by: Juan Quintela <quintela@redhat.com>
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> Message-ID: <20231009184326.15777-7-farosas@suse.de>

I bisected the failures I'm seeing on s390x to the introduction of this
script. I don't know if its simply a timeout on a relatively slow VM:

Summary of Failures:

 36/546 qemu:qtest+qtest-s390x / qtest-s390x/migration-test                       ERROR          93.51s   killed by signal 6 SIGABRT

It seems to be unstable as we pass sometimes:

11:26:42 [ajb@qemu01:~/l/q/b/system] master|… + ./pyvenv/bin/meson test --repeat 100 qtest-s390x/migration-test
ninja: Entering directory `/home/ajb/lsrc/qemu.git/builds/system'
[1/9] Generating qemu-version.h with a custom command (wrapped by meson to capture output)
  1/100 qemu:qtest+qtest-s390x / qtest-s390x/migration-test          ERROR          251.98s   killed by signal 6 SIGABRT
>>> MALLOC_PERTURB_=9 PYTHON=/home/ajb/lsrc/qemu.git/builds/system/pyvenv/bin/python3 G_TEST_DBUS_DAEMON=/home/ajb/lsrc/qemu.git/tests/dbus-vmstate-daemon.sh QTEST_QEMU_BINARY=./qemu-system-s390x QTEST_QEMU_IMG=./qemu-img QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon /home/ajb/lsrc/qemu.git/builds/system/tests/qtest/migration-test --tap -k

  2/100 qemu:qtest+qtest-s390x / qtest-s390x/migration-test          ERROR          258.71s   killed by signal 6 SIGABRT
>>> PYTHON=/home/ajb/lsrc/qemu.git/builds/system/pyvenv/bin/python3 MALLOC_PERTURB_=205 G_TEST_DBUS_DAEMON=/home/ajb/lsrc/qemu.git/tests/dbus-vmstate-daemon.sh QTEST_QEMU_BINARY=./qemu-system-s390x QTEST_QEMU_IMG=./qemu-img QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon /home/ajb/lsrc/qemu.git/builds/system/tests/qtest/migration-test --tap -k

  3/100 qemu:qtest+qtest-s390x / qtest-s390x/migration-test          OK             302.53s   46 subtests passed
  4/100 qemu:qtest+qtest-s390x / qtest-s390x/migration-test          OK             319.56s   46 subtests passed
  5/100 qemu:qtest+qtest-s390x / qtest-s390x/migration-test          OK             320.11s   46 subtests passed
  6/100 qemu:qtest+qtest-s390x / qtest-s390x/migration-test          OK             328.40s   46 subtests passed

Ok:                 4   
Expected Fail:      0   
Fail:               2   
Unexpected Pass:    0   
Skipped:            0   
Timeout:            0   

> ---
>  tests/qtest/migration-test.c | 60 ++++++++++++++++++++++++++++++++++++
>  tests/qtest/meson.build      |  2 ++
>  2 files changed, 62 insertions(+)
>
> diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
> index 8eb2053dbb..cef5081f8c 100644
> --- a/tests/qtest/migration-test.c
> +++ b/tests/qtest/migration-test.c
> @@ -66,6 +66,8 @@ static bool got_dst_resume;
>   */
>  #define DIRTYLIMIT_TOLERANCE_RANGE  25  /* MB/s */
>  
> +#define ANALYZE_SCRIPT "scripts/analyze-migration.py"
> +
>  #if defined(__linux__)
>  #include <sys/syscall.h>
>  #include <sys/vfs.h>
> @@ -1501,6 +1503,61 @@ static void test_baddest(void)
>      test_migrate_end(from, to, false);
>  }
>  
> +#ifndef _WIN32
> +static void test_analyze_script(void)
> +{
> +    MigrateStart args = {
> +        .opts_source = "-uuid 11111111-1111-1111-1111-111111111111",
> +    };
> +    QTestState *from, *to;
> +    g_autofree char *uri = NULL;
> +    g_autofree char *file = NULL;
> +    int pid, wstatus;
> +    const char *python = g_getenv("PYTHON");
> +
> +    if (!python) {
> +        g_test_skip("PYTHON variable not set");
> +        return;
> +    }
> +
> +    /* dummy url */
> +    if (test_migrate_start(&from, &to, "tcp:127.0.0.1:0", &args)) {
> +        return;
> +    }
> +
> +    /*
> +     * Setting these two capabilities causes the "configuration"
> +     * vmstate to include subsections for them. The script needs to
> +     * parse those subsections properly.
> +     */
> +    migrate_set_capability(from, "validate-uuid", true);
> +    migrate_set_capability(from, "x-ignore-shared", true);
> +
> +    file = g_strdup_printf("%s/migfile", tmpfs);
> +    uri = g_strdup_printf("exec:cat > %s", file);
> +
> +    migrate_ensure_converge(from);
> +    migrate_qmp(from, uri, "{}");
> +    wait_for_migration_complete(from);
> +
> +    pid = fork();
> +    if (!pid) {
> +        close(1);
> +        open("/dev/null", O_WRONLY);
> +        execl(python, python, ANALYZE_SCRIPT, "-f", file, NULL);
> +        g_assert_not_reached();
> +    }
> +
> +    g_assert(waitpid(pid, &wstatus, 0) == pid);
> +    if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) != 0) {
> +        g_test_message("Failed to analyze the migration stream");
> +        g_test_fail();
> +    }
> +    test_migrate_end(from, to, false);
> +    cleanup("migfile");
> +}
> +#endif
> +
>  static void test_precopy_common(MigrateCommon *args)
>  {
>      QTestState *from, *to;
> @@ -2837,6 +2894,9 @@ int main(int argc, char **argv)
>      }
>  
>      qtest_add_func("/migration/bad_dest", test_baddest);
> +#ifndef _WIN32
> +    qtest_add_func("/migration/analyze-script", test_analyze_script);
> +#endif
>      qtest_add_func("/migration/precopy/unix/plain", test_precopy_unix_plain);
>      qtest_add_func("/migration/precopy/unix/xbzrle", test_precopy_unix_xbzrle);
>      /*
> diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
> index 66795cfcd2..d6022ebd64 100644
> --- a/tests/qtest/meson.build
> +++ b/tests/qtest/meson.build
> @@ -357,6 +357,8 @@ foreach dir : target_dirs
>      test_deps += [qsd]
>    endif
>  
> +  qtest_env.set('PYTHON', python.full_path())
> +
>    foreach test : target_qtests
>      # Executables are shared across targets, declare them only the first time we
>      # encounter them

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro