FS#2745 - wpa_supplicant watchdog not working on second wifi interface (phy1)

[openwrt-bot]

guillermoeuillades:

• Device problem occurs on
  I'm using a mikrotik rb952 with QCA9531 and QCA9887 16M flash and 64 RAM.
• Software versions of OpenWrt/LEDE release, packages, etc.
  latest version compiled from source (version is from date january 17 2020)
• Steps to reproduce
  long way:
  1)remove configuration of wifi client
  2) connect wifi client (eap)

3. repaet 1)&2) 4 or mor times

short way:

1. check you have the two wpa_supplicant running with "ps | grep wpa"
2. kill the wpa_supplciant process for phy1
   this process will no be restarted.

• Overview
  for some reason after change wifi client configuration more than 4 times (or more) wifi client won't connect any more. the issue is related with wpa_supplicant (wpad symbol link) wich stop running (I could't find the reason) for the phy interface of wifi. I have two phy wifi interfaces (5ghz and 2.4ghz).
  the issue is on phy1. the process "/usr/sbin/wpa_supplicant -s -n phy1 -g /var/run/wpa_supplicant-phy1/global"
  will not be restarted automatically. but if I kill the process for phy0, after 10 seconds it will be running again.

Workarround: I found that if I run manually "hotplug-call ieee80211" the two instances of wpa_supplicant (phy0 and phy1) will be running again.

Where is the watchdog for wpa_supplicant process?
It seams that the watchdog only will monitor the first wpa_supplicant process (for phy0) and not for phy1.