LTTng » LTTng-tools

Hi

We were able to reproduce a similar issue with the self_check.cpp you provided using a local 2.11 lttng.

It seems that initializing the struct to zero as documented in the header file fixes it:

/*
 * Generic lttng event
 *
 * The structures should be initialized to zero before use.
 */
#define LTTNG_EVENT_PADDING1               12
#define LTTNG_EVENT_PADDING2               LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_event {

self_check.cpp diff:

@ self_check_orig.cpp:24 @ int lttng_init(

    int ret = 1;
    // struct lttng_domain domain_kernel;
    struct lttng_domain domain_ust;
    struct lttng_domain domain_ust = {};
    // struct lttng_handle * channel_kernel;
    struct lttng_handle * channel_ust;

@ self_check_orig.cpp:77 @ int lttng_init(
    //     }
    // }
    for (auto it = events_ust.begin(); it != events_ust.end(); it++) {
        struct lttng_event event;
        struct lttng_event event = {};
        event.type = LTTNG_EVENT_TRACEPOINT;
        strcpy(event.name, it->c_str());
        event.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;

Could you validate that it indeed fixes it inside a docker env?

Cheers