Async read stalled? After weeks of running. How to fix?

[MatejsLab]

Hi,

I am running the rtl_433 on two linux pepermint home servers for a year now, i really like it (when working).

Last few months the issues arised that is stops working and needs manual restart of service, odd right.

The rtl_433 randomly stops working after many weeks of normal runitime, it keeps reocouring lately.

Below is the status data, but how do i fix it so it doesn't stall . Or how it should decide to restart? As service doesn't detect error to restart.

For reference i have one blue and one black RTL stick from Aliexpress. Blue has better range, but both work fine in near proximity of temperature sensors and rain sensors.

I forgot if i wrote the service or it was installed?
I compiled it and it is 1 year ago so i barely remember what i did, and so it is harder to fix.

Help Appriciated,

Matej

rtl_433 
version nightly-10-g07368e73 branch master at 202309251404 inputs file rtl_tcp RTL-SDR
Use -h for usage help and see https://triq.org/ for documentation.
Trying conf file at "rtl_433.conf"...
Trying conf file at "/home/serveroh2/.config/rtl_433/rtl_433.conf"...
Reading conf from "/home/serveroh2/.config/rtl_433/rtl_433.conf".
[Protocols] Registered 211 out of 246 device decoding protocols [ 1-4 8 10-12 15-17 19-23 25-26 29-36 38-45 47-60 63 67-71 73-100 102-105 108-116 119-121 124-128 130-149 151-161 163-168 170-175 177-197 199-215 217-228 230-232 234-237 239-241 243-244 246 ]
usb_claim_interface error -6
[sdr_open_rtl] Failed to open rtlsdr device #0.
[sdr_open_rtl] Unable to open a device


service rtl_433 status
● rtl_433.service - <rtl_433_MQTT_MK>
   Loaded: loaded (/etc/systemd/system/rtl_433.service; enabled; vendor preset: enable
   Active: active (running) since Mon 2024-08-12 21:57:46 CEST; 1 months 7 days ago
 Main PID: 1488 (rtl_433)
    Tasks: 3 (limit: 4618)
   CGroup: /system.slice/rtl_433.service
           └─1488 rtl_433 -F mqtt://192.168.1.100 1883 retain 0 devices senzorji_RTL_4

sep 17 22:45:11 serveroh2 bash[1488]: Temperature: 23.20 C
sep 17 22:45:11 serveroh2 bash[1488]: Humidity  : 62 %
sep 17 22:45:11 serveroh2 bash[1488]: Modulation: ASK
sep 17 22:45:11 serveroh2 bash[1488]: Freq      : 433.9 MHz
sep 17 22:45:11 serveroh2 bash[1488]: RSSI      : -9.4 dB
sep 17 22:45:11 serveroh2 bash[1488]: SNR       : 18.1 dB
sep 17 22:45:11 serveroh2 bash[1488]: Noise     : -27.5 dB
sep 17 22:45:20 serveroh2 bash[1488]: [Auto Level] Current noise level -28.7 dB, estim
sep 17 22:45:30 serveroh2 bash[1488]: [Auto Level] Current noise level -28.9 dB, estim
sep 17 22:45:54 serveroh2 bash[1488]: [Input] Async read stalled, exiting!

[zuckschwerdt]

"Async read stalled, exiting!" suggests a hardware failure. The problem is that the RTL-SDR stops sending data -- it is likely locked-up / frozen. That's what the "usb_claim_interface error" also suggests -- the RTL-SDR is not available.

I had this happen with these causes: bad power supply (aging it would undervolt), overheated RTL-SDR (random freezes, days or weeks apart).

[ProfBoc75]

"Async read stalled, exiting!" suggests a hardware failure. The problem is that the RTL-SDR stops sending data -- it is likely locked-up / frozen. That's what the "usb_claim_interface error" also suggests -- the RTL-SDR is not available.

I had this happen with these causes: bad power supply (aging it would undervolt), overheated RTL-SDR (random freezes, days or weeks apart).

Agree, I was also facing such issues due to bad contacts. My advice is to have a good quality usb extension cable, tighten connectors to force contacts, the USB A ground part of the RTL dongle.