Carla has a high chance of closing (stopping the engine) after waking up from suspend or hibernation

[SnipeXandrej]

I run Carla with PipeWire JACK, and there's a pretty high chance that after I suspend/hibernate my laptop, and then wake up, Carla will throw a bunch of "plugin bridges" (or whatever) errors, and after that I just restart Carla.

I am running into this issue on Arch Linux, Carla 2.5.9 and PipeWire 1.2.5 (though much older versions still had these "crashes", so it's not a new bug/regression)

In the logs this gets printed:

lilv_world_add_plugin(): warning: Duplicate plugin <https://github.com/lucianodato/noise-repellent-stereo#new>
lilv_world_add_plugin(): warning: ... found in file:///home/snipex/.lv2/nrepellent.lv2/
lilv_world_add_plugin(): warning: ... and      file:///usr/lib/lv2/nrepellent.lv2/ (ignored)
[carla] Did not receive ping message from server for 30 secs, closing...
[carla] [carla] Did not receive ping message from server for 30 secs, closing...
Did not receive ping message from server for 30 secs, closing...
[carla] [carla] Did not receive ping message from server for 30 secs, closing...[carla] 
[carla] Did not receive ping message from server for 30 secs, closing...
Did not receive ping message from server for 30 secs, closing...
[carla] Did not receive ping message from server for 30 secs, closing...
[carla] Did not receive ping message from server for 30 secs, closing...Did not receive ping message from server for 30 secs, closing...

[carla] Did not receive ping message from server for 30 secs, closing...[carla] 
[carla] Did not receive ping message from server for 30 secs, closing...
Did not receive ping message from server for 30 secs, closing...
[carla] Did not receive ping message from server for 30 secs, closing...
[carla] Did not receive ping message from server for 30 secs, closing...
[carla] CarlaRingBuffer::tryWrite(0x7ffcf4315b74, 4): failed, not enough space
[carla] waitForClient(process) timed out
[carla] waitForClient(process) timed out[carla] waitForClient(process) timed out
[carla] [carla] waitForClient(process) timed out[carla] waitForClient(process) timed out

[carla] [carla] waitForClient(process) timed out
[carla] waitForClient(process) timed out
waitForClient(process) timed out

waitForClient(process) timed out
[carla] waitForClient(process) timed out
[carla] Carla assertion failure: "unlocked" in file ../utils/CarlaSemUtils.hpp, line 182
[carla] CarlaRingBuffer::tryWrite(0x7ffcf4315bd4, 4): failed, not enough space
[carla] [carla] [carla] CarlaRingBuffer::tryWrite(0x7ffc8766fee0, 4): failed, not enough space
CarlaRingBuffer::tryWrite(0x7ffc054bd770, 4): failed, not enough space
CarlaRingBuffer::tryWrite(0x7ffc79516d60, 4): failed, not enough space
[carla] CarlaRingBuffer::tryWrite(0x7ffcf4315bd4, 4): failed, not enough space
[carla] CarlaRingBuffer::tryWrite(0x7ffcf4315bd4, 4): failed, not enough space
[carla] [carla] Bridge: Failed to wait for engine, is audio not running?Bridge: Failed to wait for engine, is audio not running?

[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] waitForClient(process) timed out
[carla] waitForClient(process) timed out
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] Bridge: Failed to wait for engine, is audio not running?
[carla] CarlaThread setup with realtime priority successful
[carla] Carla Bridge Ready!

And so I made a pretty simple workaround patch to stop Carla from unnecessarily and forcibly closing:

diff --git a/source/backend/engine/CarlaEngineBridge.cpp b/source/backend/engine/CarlaEngineBridge.cpp
index 20f1fdff5..9034212d3 100644
--- a/source/backend/engine/CarlaEngineBridge.cpp
+++ b/source/backend/engine/CarlaEngineBridge.cpp
@@ -649,9 +649,9 @@ public:
 
         if (fLastPingTime > 0 && Time::currentTimeMillis() > fLastPingTime + 30000 && ! wasFirstIdle)
         {
-            carla_stderr("Did not receive ping message from server for 30 secs, closing...");
-            signalThreadShouldExit();
-            callback(true, true, ENGINE_CALLBACK_QUIT, 0, 0, 0, 0, 0.0f, nullptr);
+            carla_stderr("Did not receive ping message from server for 30 secs, closing... (not closing heheh)");
+            // signalThreadShouldExit();
+            // callback(true, true, ENGINE_CALLBACK_QUIT, 0, 0, 0, 0, 0.0f, nullptr);
         }
     }
 

now it just prints that it would be closing like before, but actually doesn't with the above patch, and just continues running just fine

[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] [carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] [carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)Did not receive ping message from server for 30 secs, closing... (not closing heheh)

[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] [carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
[carla] Did not receive ping message from server for 30 secs, closing... (not closing heheh)
Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25
[carla] Carla assertion failure: "groupName != nullptr && groupName[0] != '\0'" in file ../utils/CarlaPatchbayUtils.cpp, line 25