Crash when calling `ma_context_get_device_info` while there's a loaded `module-remap-source` module

[asapha]

Repro

• Load the module (They're removed after a restart)
  • pactl load-module module-null-sink sink_name=audiorelay-virtual-mic-sink sink_properties=device.description=Virtual-Mic-Sink
  • pactl load-module module-remap-source master=audiorelay-virtual-mic-sink.monitor source_name=audiorelay-virtual-mic-sink source_properties=device.description=Virtual-Mic
• Run a program calling ma_context_get_device_info

For example, set this in simple_enumeration.c

  printf("Capture Devices\n");
  for (iDevice = 0; iDevice < captureDeviceCount; ++iDevice)
  {
      ma_device_info info = pCaptureDeviceInfos[iDevice];
      ma_context_get_device_info(&context, ma_device_type_capture, &info.id, &info);
      printf("    %u: %s\n", iDevice, info.name);
  }

Result

Program received signal SIGSEGV, Segmentation fault.
0x0000555555566d47 in ma_context_get_device_info_source_callback__pulse (pPulseContext=0x555555652ed0, pInfo=0x0, endOfList=-1, pUserData=0x7fffffffd280) at [...]
31598	    if (pInfo->name != NULL) {
The target architecture is set to "auto" (currently "i386:x86-64").

ma_context_get_device_info_source_callback__pulse miniaudio.h:31598
ma_wait_for_operation__pulse miniaudio.h:31143
ma_wait_for_operation_and_unref__pulse miniaudio.h:31160
ma_context_get_device_info__pulse miniaudio.h:31651
ma_context_get_device_info miniaudio.h:43578
main simple_enumeration.c:51

If you call run the program again after restarting pulseaudio (via systemctl --user restart pipewire-pulse.service) , it will no longer crash.

Info
Tested with 0.11.25
It doesn't occur with dev-0.12

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 24.04.4 LTS
Release:        24.04
Codename:       noble

pipewire --version
pipewire
Compiled with libpipewire 1.0.5
Linked with libpipewire 1.0.5

pactl --version
pactl 16.1
Compiled with libpulse 16.1.0
Linked with libpulse 16.1.0

---

By the way, are you interested in bug reports for dev-0.12? The pipewire enumeration crashes on my end and, I think I'm getting late (or missed) capture callbacks on other backends.

[mackron]

Thanks a lot for this. I had a report of something very similar. Currently focusing my attention on another project, but will report back when I get a chance.

I'm very interested in bug reports for dev-0.12.

When you say it doesn't occur with 0.12, is that because it was simply not using PulseAudio? PipeWire is the new default with 0.12.

[asapha]

When you say it doesn't occur with 0.12, is that because it was simply not using PulseAudio? PipeWire is the new default with 0.12.

No, no. I forced PulseAudio as PipeWire doesn't work at all on my end (#1104).