Bug #425
closedlttng-sessiond gets a segmentation fault
0%
Description
Situation:
A session is running and just before destroying the session, we launch a bunch of instrumented application.
This made lttng-sessiond do a core dump.
By analyzing the core file, the core dump happened in create_ust_channel.c at line 783
I attached the small analyze that I ran with gdb on the core file.
The version of Lttng used is 1.2.0 with:
lttng-tools: 2.1.1
lttng-ust: 2.1.0
userspace-rcu: 0.7.5
Files
Updated by David Goulet over 11 years ago
- Status changed from New to Confirmed
- Assignee set to David Goulet
- Target version set to 2.1 stable
Updated by David Goulet over 11 years ago
If you can reproduce that with no optimization (gcc -O0), it would be great since the ret value here is quite important. It seems that a ustctl_create_channel call returned a positive value but actually failed to populate the obj.
Furthermore, no optimization will ensure that the segfault is really at that place with more information as well.
Thanks!
Updated by David Goulet over 11 years ago
This might be fixed with the latest commit of lttng-ust.
(stable-2.1) c7b9470b6849bc42d0c3a835b917e764e8c13fc9
There was a code path that could have sent a positive value on error.
Thanks
Updated by David Goulet about 11 years ago
- Status changed from Confirmed to Feedback
Updated by Mathieu Bain about 11 years ago
Hi David,
I tested the patch and up to now i don't see the issue any more.
If this shows up sometime later, i will raise a new bug
Thanks
Updated by David Goulet about 11 years ago
- Status changed from Feedback to Resolved
Ok. Fair enough, I'll close this one since we can't do much for now.
Thanks!