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Bug #1247
closedSegfault when using liblttng-ctl to enable events in docker
Status:
Resolved
Priority:
Normal
Assignee:
-
Target version:
-
Start date:
03/27/2020
Due date:
% Done:
100%
Estimated time:
Description
With LTTng 2.11
Host: Linux chrisnux 4.15.0-91-generic #92-Ubuntu SMP Fri Feb 28 11:09:48 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
See attached archive to reproduce
$ ./docker_build.sh
$ ./docker_run.sh
root@...:/lttng-ctl-docker-segfault# ./build_run_app.sh
Use ./docker_build_2-10.sh to try with LTTng 2.10, which should work (i.e. not segfault).
Files
Updated by Christophe Bedard about 4 years ago
As can be seen in the Dockerfile, it's using ubuntu:bionic as a base image and uses the stable-2.11/stable-2.10 PPAs
Updated by Jonathan Rajotte Julien about 4 years ago
- Status changed from New to Feedback
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
Updated by Jonathan Rajotte Julien about 4 years ago
- Status changed from Feedback to Resolved
- % Done changed from 0 to 100
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