Sometimes, when I try to suspend my computer, it fails to freeze, telling me:

[Wed Sep  9 19:14:36 2020] Freezing user space processes ... 
[Wed Sep  9 19:14:56 2020] Freezing of tasks failed after 20.005 seconds (5 tasks refusing to freeze, wq_busy=0):
[Wed Sep  9 19:14:56 2020] wpa_supplicant  D    0  1065      1 0x00000004
[Wed Sep  9 19:14:56 2020] Call Trace:
[Wed Sep  9 19:14:56 2020]  __schedule+0x291/0x8a0
[Wed Sep  9 19:14:56 2020]  schedule+0x2c/0x80
[Wed Sep  9 19:14:57 2020] Freezing user space processes ... 
[Wed Sep  9 19:15:17 2020] Freezing of tasks failed after 20.007 seconds (9 tasks refusing to freeze, wq_busy=0):
[Wed Sep  9 19:15:17 2020] wpa_supplicant  D    0  1065      1 0x00000004
[Wed Sep  9 19:15:17 2020] Call Trace:
[Wed Sep  9 19:15:17 2020]  __schedule+0x291/0x8a0
[Wed Sep  9 19:15:17 2020]  schedule+0x2c/0x80

This question suggests I should create a script in /etc/pm/sleep.d/. I wrote my script called 00_user: sh #!/bin/sh (killall -9 wpa_supplicant; exit 0) and used chmod +x, but this didn't resolve the issue.

I tried to add the BSSID according to this post, but that didn't help, either.

My machine information is as follows:

(Most notably, using Linux Mint 19.2 which is based on Ubuntu 18.04)

  Host: myNameUwU Kernel: 4.15.0-54-generic x86_64 bits: 64 
  compiler: gcc v: 7.4.0 Desktop: Cinnamon 4.2.4 
  Distro: Linux Mint 19.2 Tina base: Ubuntu 18.04 bionic 
  Type: Laptop System: SAMSUNG 
  product: 500R4K/500R5H/5400RK/501R5H/5500RH/500R5S 
  v: P08RDD serial: <filter> 
  Mobo: SAMSUNG model: NT500R5H-Y53M 
  v: SGL8578A0U-C01-G004-S0001+10.0.10240 serial: <filter> 
  UEFI: American Megatrends v: P08RDD.171.160427.CL 
  date: 04/27/2016 
  ID-1: BAT1 charge: 21.0 Wh condition: 22.8/43.1 Wh (53%) 
  model: SAMSUNG Electronics SR Real Battery 
  status: Discharging 
  Topology: Dual Core model: Intel Core i5-5200U bits: 64 
  type: MT MCP arch: Broadwell rev: 4 L2 cache: 3072 KiB 
  flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 17560 
  Speed: 798 MHz min/max: 500/2700 MHz Core speeds (MHz): 
  1: 800 2: 798 3: 798 4: 798 
  Device-1: Intel HD Graphics 5500 vendor: Samsung Co 
  driver: i915 v: kernel bus ID: 00:02.0 
  Device-2: NVIDIA GM108M [GeForce 940M] vendor: Samsung Co 
  driver: nvidia v: 410.48 bus ID: 03:00.0 
  Display: x11 server: X.Org 1.19.6 
  driver: modesetting,nvidia unloaded: fbdev,nouveau,vesa 
  resolution: 1920x1080~60Hz 
  OpenGL: renderer: GeForce 940M/PCIe/SSE2 
  v: 4.6.0 NVIDIA 410.48 direct render: Yes 
  Device-1: Intel Broadwell-U Audio vendor: Samsung Co 
  driver: snd_hda_intel v: kernel bus ID: 00:03.0 
  Device-2: Intel Wildcat Point-LP High Definition Audio 
  vendor: Samsung Co driver: snd_hda_intel v: kernel 
  bus ID: 00:1b.0 
  Sound Server: ALSA v: k4.15.0-54-generic 
  Device-1: Qualcomm Atheros QCA6174 802.11ac Wireless 
  Network Adapter 
  vendor: Samsung Co driver: ath10k_pci v: kernel port: f040 
  bus ID: 01:00.0 
  IF: wlp1s0 state: up mac: <filter> 
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit 
  vendor: Samsung Co driver: r8169 v: 2.3LK-NAPI port: e000 
  bus ID: 02:00.0 
  IF: enp2s0 state: down mac: <filter> 
  Device-3: Atheros type: USB driver: btusb bus ID: 2-4:3 
  Local Storage: total: 585.00 GiB used: 368.68 GiB (63.0%) 
  ID-1: /dev/sda vendor: LITE-ON model: CV1-8B128 
  size: 119.24 GiB 
  ID-2: /dev/sdb vendor: Toshiba model: MQ01ABF050 
  size: 465.76 GiB 
  ID-1: / size: 71.89 GiB used: 51.88 GiB (72.2%) fs: ext4 
  dev: /dev/sda5 
  System Temperatures: cpu: 57.0 C mobo: 57.0 C gpu: nvidia 
  temp: 55 C 
  Fan Speeds (RPM): N/A 
  Processes: 260 Uptime: 5m Memory: 7.69 GiB 
  used: 2.13 GiB (27.7%) Init: systemd runlevel: 5 Compilers: 
  gcc: 7.5.0 Shell: bash v: 4.4.20 inxi: 3.0.32 

Any help appreciated. Thank you

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