multithreaded executor blocked when there are 8 running nodes

[sgf201]

Bug report

Required Info:

• Operating System:
  Ubuntu20
• Installation type:
  binaries
• Version or commit hash:
  ros2humble
• DDS implementation:
  Fast-RTPS
• Client library (if applicable):
  rclcpp

Steps to reproduce issue

launch 8 nodes for pull h264 stream and decode
launch 4 perception_node in multithread executor

Expected behavior

multithread executor works well

Actual behavior

multithreaded executor blocked

Additional information

---

[Zard-C]

From the log, I found process has died, exit code -11, could you check the progress status ? I don't think it's blocked.

[fujitatomoya]

it looks like it received segmentation fault. but we need more information, could you provide how to reproduce this issue? e.g) distribution, rmw implementation, package version.

[sgf201]

From the log, I found process has died, exit code -11, could you check the progress status ? I don't think it's blocked.
It is blocked for a long while ,then crashed

[Zard-C]

From the log, I found process has died, exit code -11, could you check the progress status ? I don't think it's blocked.
It is blocked for a long while ,then crashed

could you add this detail to Bug Report?

as you described:

1. The Executor was spinning but no callback was called, which was not expected to.
2. The Executor spin for a while (how long ?) then the the progress was recieved signal 11 (which is SIGSEGV) .

Out of my head, I have no explanation, why it was blocked, could you provide more information about how to reproduce this issue?

Besides, you can run the program with gdb, and check where it crashed, maybe it's an important clue.

[Zard-C]

@sgf201 any update 😄 ?

[sgf201]

thread safe problem ,4 nodes crashed on the save object. thanks