[eCAL 6] Linux - SHM Subscribers can appear connected but do not receive data #1914
Comments
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Ahaha, reproduced the problem in CI with a modified test case https://github.com/DownerCase/ecal/actions/runs/12828875683/job/35773823178#step:11:897 so not specific to my setup 😄 |
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Testing different config settings to narrow down the problem:
Problem appears to be with the SHM transport layer. Log from good UDP transportLog from bad SHM transportNothing leaps out when diffing the two, the structure of the logs appears functionally identical. |
DownerCase
changed the title
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Didn't get too close with this. I could see that in the zombie case sync events were being sent but somehow not received on the other end... Address and undefined behaviour sanitizers didn't report anything but thread sanitizer was extraordinarily upset. I'll work through the various synchronization errors in the vain hope one of them will help... |
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Ok, I've found that disabling the call to ecal/ecal/core/src/ecal_event.cpp Line 180 in 4bbe51c What is happening is that:
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Thanks for debugging into this issue so much. Maybe we should take a step back, and see what kind of behavior we we would like to see.
I guess there are pros / cons to both approaches. |
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Preliminary fixed by #1943. |
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Status: Problem understood. When only a single subscriber for a topic is present, unsubscribing and resubscribing in less than the registration timeout period will result in the subscriber using a stale SHM file and be unable to receive new messages.
Extracted from #1880 (comment)
Problem Description
I found that with eCAL monitor applications when inspecting messages from topic A, switching to topic B, and then returning to topic A the application will no longer receive any messages, despite it indicating being connected.
How to reproduce
cmake --preset clicmake --build --preset cli./out/cli/build/bin/ecal_mon_tui./out/cli/build/bin/ecal_sample_person_snd./out/cli/build/bin/ecal_sample_minimal_sndHow did you get eCAL?
Built from source
Environment
eCAL System Information
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