Enabling audio loopback crashes pulseaudio

Sorry about the delay; loong day at work.

System:
  Kernel: 5.14.7-2-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.14-x86_64 
  root=UUID=ab97410d-219d-4b6b-a11e-ecd4e63ac169 rw quiet apparmor=1 
  security=apparmor udev.log_priority=3 
  Desktop: KDE Plasma 5.22.5 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM 
  Distro: Manjaro Linux base: Arch Linux 
Machine:
  Type: Desktop Mobo: ASUSTeK model: ROG CROSSHAIR VIII HERO (WI-FI) 
  v: Rev X.0x serial: <filter> UEFI: American Megatrends v: 2103 
  date: 06/19/2020 
Battery:
  Message: No system battery data found. Is one present? 
Memory:
  RAM: total: 62.72 GiB used: 3.66 GiB (5.8%) 
  RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
CPU:
  Info: 12-Core model: AMD Ryzen 9 3900X bits: 64 type: MT MCP arch: Zen 2 
  family: 17 (23) model-id: 71 (113) stepping: 0 microcode: 8701021 cache: 
  L2: 6 MiB bogomips: 182131 
  Speed: 2069 MHz min/max: 2200/3800 MHz boost: enabled Core speeds (MHz): 
  1: 2069 2: 2053 3: 2195 4: 2195 5: 2050 6: 2052 7: 3592 8: 3593 9: 2051 
  10: 2050 11: 2092 12: 3593 13: 3593 14: 2110 15: 2196 16: 2195 17: 2197 
  18: 3586 19: 2050 20: 2049 21: 2049 22: 3590 23: 2052 24: 2196 
  Flags: 3dnowprefetch abm adx aes aperfmperf apic arat avic avx avx2 bmi1 
  bmi2 bpext cat_l3 cdp_l3 clflush clflushopt clwb clzero cmov cmp_legacy 
  constant_tsc cpb cpuid cqm cqm_llc cqm_mbm_local cqm_mbm_total cqm_occup_llc 
  cr8_legacy cx16 cx8 de decodeassists extapic extd_apicid f16c flushbyasid 
  fma fpu fsgsbase fxsr fxsr_opt ht hw_pstate ibpb ibs irperf lahf_lm lbrv lm 
  mba mca mce misalignsse mmx mmxext monitor movbe msr mtrr mwaitx nonstop_tsc 
  nopl npt nrip_save nx osvw overflow_recov pae pat pausefilter pclmulqdq 
  pdpe1gb perfctr_core perfctr_llc perfctr_nb pfthreshold pge pni popcnt pse 
  pse36 rapl rdpid rdpru rdrand rdseed rdt_a rdtscp rep_good sep sev sev_es 
  sha_ni skinit smap smca sme smep ssbd sse sse2 sse4_1 sse4_2 sse4a ssse3 
  stibp succor svm svm_lock syscall tce topoext tsc tsc_scale umip v_spec_ctrl 
  v_vmsave_vmload vgif vmcb_clean vme vmmcall wbnoinvd wdt xgetbv1 xsave 
  xsavec xsaveerptr xsaveopt xsaves 
  Vulnerabilities: Type: itlb_multihit status: Not affected 
  Type: l1tf status: Not affected 
  Type: mds status: Not affected 
  Type: meltdown status: Not affected 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Full AMD retpoline, IBPB: conditional, STIBP: 
  conditional, RSB filling 
  Type: srbds status: Not affected 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: NVIDIA GA104 [GeForce RTX 3070] 
  vendor: PC Partner Limited / Sapphire driver: nvidia v: 470.63.01 
  bus-ID: 0b:00.0 chip-ID: 10de:2484 class-ID: 0300 
  Device-2: ARC Camera type: USB driver: snd-usb-audio,uvcvideo 
  bus-ID: 3-2.1:4 chip-ID: 05a3:9331 class-ID: 0102 serial: <filter> 
  Display: x11 server: X.Org 1.20.13 compositor: kwin_x11 driver: 
  loaded: nvidia display-ID: :0 screens: 1 
  Screen-1: 0 s-res: 5120x1440 s-dpi: 121 s-size: 1073x302mm (42.2x11.9") 
  s-diag: 1115mm (43.9") 
  Monitor-1: DP-2 res: 2560x1440 dpi: 123 size: 527x296mm (20.7x11.7") 
  diag: 604mm (23.8") 
  Monitor-2: DP-4 res: 2560x1440 dpi: 123 size: 527x296mm (20.7x11.7") 
  diag: 604mm (23.8") 
  OpenGL: renderer: NVIDIA GeForce RTX 3070/PCIe/SSE2 
  v: 4.6.0 NVIDIA 470.63.01 direct render: Yes 
Audio:
  Device-1: NVIDIA GA104 High Definition Audio 
  vendor: PC Partner Limited / Sapphire driver: snd_hda_intel v: kernel 
  bus-ID: 0b:00.1 chip-ID: 10de:228b class-ID: 0403 
  Device-2: AMD Starship/Matisse HD Audio vendor: ASUSTeK 
  driver: snd_hda_intel v: kernel bus-ID: 0d:00.4 chip-ID: 1022:1487 
  class-ID: 0403 
  Device-3: FiiO FiiO BTR5 type: USB driver: snd-usb-audio bus-ID: 1-1.1:24 
  chip-ID: 2972:0047 class-ID: fe01 
  Device-4: ARC Camera type: USB driver: snd-usb-audio,uvcvideo 
  bus-ID: 3-2.1:4 chip-ID: 05a3:9331 class-ID: 0102 serial: <filter> 
  Sound Server-1: ALSA v: k5.14.7-2-MANJARO running: yes 
  Sound Server-2: JACK v: 1.9.19 running: no 
  Sound Server-3: PulseAudio v: 15.0 running: yes 
  Sound Server-4: PipeWire v: 0.3.38 running: yes 
Network:
  Device-1: Realtek RTL8125 2.5GbE vendor: ASUSTeK driver: r8169 v: kernel 
  port: e000 bus-ID: 05:00.0 chip-ID: 10ec:8125 class-ID: 0200 
  IF: enp5s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
  IP v4: <filter> type: dynamic noprefixroute scope: global 
  broadcast: <filter> 
  IP v6: <filter> type: noprefixroute scope: link 
  Device-2: Intel I211 Gigabit Network vendor: ASUSTeK driver: igb v: kernel 
  port: d000 bus-ID: 06:00.0 chip-ID: 8086:1539 class-ID: 0200 
  IF: enp6s0 state: down mac: <filter> 
  Device-3: Intel Wi-Fi 6 AX200 driver: iwlwifi v: kernel port: d000 
  bus-ID: 07:00.0 chip-ID: 8086:2723 class-ID: 0280 
  IF: wlp7s0 state: down mac: <filter> 
  WAN IP: <filter> 
Bluetooth:
  Device-1: Intel AX200 Bluetooth type: USB driver: btusb v: 0.8 bus-ID: 1-6:5 
  chip-ID: 8087:0029 class-ID: e001 
  Report: rfkill ID: hci0 rfk-id: 1 state: down bt-service: enabled,running 
  rfk-block: hardware: no software: yes address: see --recommends 
Logical:
  Message: No logical block device data found. 
RAID:
  Message: No RAID data found. 
Drives:
  Local Storage: total: 2.96 TiB used: 56.51 GiB (1.9%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/nvme0n1 maj-min: 259:5 model: PCIe SSD size: 238.47 GiB 
  block-size: physical: 512 B logical: 512 B speed: 31.6 Gb/s lanes: 4 
  type: SSD serial: <filter> rev: ECFM22.6 temp: 27.9 C scheme: GPT 
  ID-2: /dev/nvme1n1 maj-min: 259:0 model: PCIe SSD size: 931.51 GiB 
  block-size: physical: 512 B logical: 512 B speed: 63.2 Gb/s lanes: 4 
  type: SSD serial: <filter> rev: EGFM11.0 temp: 35.9 C scheme: GPT 
  ID-3: /dev/sda maj-min: 8:0 vendor: Seagate model: ST2000DM001-1ER164 
  size: 1.82 TiB block-size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s 
  type: HDD rpm: 7200 serial: <filter> rev: CC25 scheme: GPT 
  Message: No optical or floppy data found. 
Partition:
  ID-1: / raw-size: 238.17 GiB size: 233.43 GiB (98.01%) 
  used: 56.51 GiB (24.2%) fs: ext4 dev: /dev/nvme0n1p2 maj-min: 259:7 
  label: N/A uuid: ab97410d-219d-4b6b-a11e-ecd4e63ac169 
  ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%) 
  used: 280 KiB (0.1%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:6 label: N/A 
  uuid: F49E-8144 
Swap:
  Alert: No swap data was found. 
Unmounted:
  ID-1: /dev/nvme1n1p1 maj-min: 259:1 size: 529 MiB fs: ntfs label: Recovery 
  uuid: A0CEC91DCEC8ED1A 
  ID-2: /dev/nvme1n1p2 maj-min: 259:2 size: 100 MiB fs: vfat label: N/A 
  uuid: 10C9-47BA 
  ID-3: /dev/nvme1n1p3 maj-min: 259:3 size: 16 MiB fs: <superuser required> 
  label: N/A uuid: N/A 
  ID-4: /dev/nvme1n1p4 maj-min: 259:4 size: 930.88 GiB fs: ntfs label: N/A 
  uuid: 084EC9E74EC9CE1E 
  ID-5: /dev/sda1 maj-min: 8:1 size: 1.82 TiB fs: ntfs label: externalData 
  uuid: 2652FC3C52FC11F3 
USB:
  Hub-1: 1-0:1 info: Full speed (or root) Hub ports: 6 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-2: 1-1:2 info: Realtek RTS5411 Hub ports: 3 rev: 2.1 speed: 480 Mb/s 
  chip-ID: 0bda:5411 class-ID: 0900 
  Device-1: 1-1.1:24 info: FiiO FiiO BTR5 type: Audio driver: snd-usb-audio 
  interfaces: 3 rev: 2.0 speed: 480 Mb/s chip-ID: 2972:0047 class-ID: fe01 
  Device-2: 1-1.3:10 info: Realtek BillBoard Device type: Billboard 
  driver: N/A interfaces: 1 rev: 2.0 speed: 480 Mb/s chip-ID: 0bda:5418 
  class-ID: 1100 serial: <filter> 
  Hub-3: 1-5:3 info: Genesys Logic Hub ports: 4 rev: 2.0 speed: 480 Mb/s 
  power: 100mA chip-ID: 05e3:0610 class-ID: 0900 
  Device-1: 1-5.3:6 info: ASUSTek AURA LED Controller type: HID 
  driver: hid-generic,usbhid interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 16mA 
  chip-ID: 0b05:18f3 class-ID: 0300 serial: <filter> 
  Device-2: 1-6:5 info: Intel AX200 Bluetooth type: Bluetooth driver: btusb 
  interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 100mA chip-ID: 8087:0029 
  class-ID: e001 
  Hub-4: 2-0:1 info: Full speed (or root) Hub ports: 4 rev: 3.1 speed: 10 Gb/s 
  chip-ID: 1d6b:0003 class-ID: 0900 
  Hub-5: 2-3:2 info: Realtek Hub ports: 2 rev: 3.1 speed: 5 Gb/s 
  chip-ID: 0bda:0411 class-ID: 0900 
  Hub-6: 3-0:1 info: Full speed (or root) Hub ports: 6 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-7: 3-2:2 info: ASMedia ASM1074 High-Speed hub ports: 4 rev: 2.1 
  speed: 480 Mb/s power: 100mA chip-ID: 174c:2074 class-ID: 0900 
  Device-1: 3-2.1:4 info: ARC Camera type: Video,Audio 
  driver: snd-usb-audio,uvcvideo interfaces: 4 rev: 2.0 speed: 480 Mb/s 
  power: 200mA chip-ID: 05a3:9331 class-ID: 0102 serial: <filter> 
  Device-2: 3-5:3 info: Cooler Master AMD SR4 lamplight Control 
  type: Keyboard,HID driver: hid-generic,usbhid interfaces: 3 rev: 2.0 
  speed: 12 Mb/s power: 100mA chip-ID: 2516:0051 class-ID: 0300 
  Hub-8: 4-0:1 info: Full speed (or root) Hub ports: 4 rev: 3.1 speed: 10 Gb/s 
  chip-ID: 1d6b:0003 class-ID: 0900 
  Hub-9: 4-2:2 info: ASMedia ASM1074 SuperSpeed hub ports: 4 rev: 3.0 
  speed: 5 Gb/s power: 8mA chip-ID: 174c:3074 class-ID: 0900 
  Hub-10: 5-0:1 info: Full speed (or root) Hub ports: 4 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-11: 5-1:2 info: Texas Instruments TUSB8041 4-Port Hub ports: 4 rev: 2.1 
  speed: 480 Mb/s chip-ID: 0451:8142 class-ID: 0900 
  Hub-12: 5-2:3 info: Texas Instruments TUSB8041 4-Port Hub ports: 4 rev: 2.1 
  speed: 480 Mb/s chip-ID: 0451:8142 class-ID: 0900 
  Hub-13: 5-4:4 info: Realtek RTS5411 Hub ports: 4 rev: 2.1 speed: 480 Mb/s 
  chip-ID: 0bda:5411 class-ID: 0900 
  Device-1: 5-4.1:5 info: SINOWEALTH Game Mouse type: Mouse,Keyboard 
  driver: hid-generic,usbhid interfaces: 2 rev: 1.1 speed: 12 Mb/s 
  power: 256mA chip-ID: 258a:1007 class-ID: 0301 
  Device-2: 5-4.4:6 info: Microdia Redragon Mitra RGB Keyboard 
  type: Keyboard,Mouse driver: hid-generic,usbhid interfaces: 2 rev: 2.0 
  speed: 12 Mb/s power: 400mA chip-ID: 0c45:5004 class-ID: 0301 
  Hub-14: 6-0:1 info: Full speed (or root) Hub ports: 4 rev: 3.1 
  speed: 10 Gb/s chip-ID: 1d6b:0003 class-ID: 0900 
  Hub-15: 6-1:2 info: Texas Instruments TUSB8041 4-Port Hub ports: 4 rev: 3.0 
  speed: 5 Gb/s chip-ID: 0451:8140 class-ID: 0900 
  Hub-16: 6-2:3 info: Texas Instruments TUSB8041 4-Port Hub ports: 4 rev: 3.0 
  speed: 5 Gb/s chip-ID: 0451:8140 class-ID: 0900 
  Hub-17: 6-4:4 info: Realtek Hub ports: 4 rev: 3.1 speed: 5 Gb/s 
  chip-ID: 0bda:0411 class-ID: 0900 
Sensors:
  System Temperatures: cpu: 50.0 C mobo: N/A gpu: nvidia temp: 32 C 
  Fan Speeds (RPM): N/A gpu: nvidia fan: 37% 
Info:
  Processes: 405 Uptime: 9m wakeups: 0 Init: systemd v: 249 tool: systemctl 
  Compilers: gcc: 11.1.0 clang: 12.0.1 Packages: pacman: 1389 lib: 425 
  flatpak: 0 Shell: Bash v: 5.1.8 running-in: konsole inxi: 3.3.06 

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