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Cisco Bug: CSCvv34695 - 1832 APs crashed due to dnsmasq-host.service failed on upgrading 8540 WLC above 8.5 train

Last Modified

Sep 03, 2020

Products (1)

  • Cisco Aironet 1850 Series Access Points

Known Affected Releases


Description (partial)

There is an 8540 WLC running on with multiple AP models including 1832's. When the controller is upgraded to any code higher than 8.5, all 1832 model AP’s start crashing with crash files generated but other models remain stable. Upon reverting back to 8.5, the 1832 access points stabilize again.

Failure logs seen in the AP crash file:
kernel: [*08/03/2020 23:47:28.6664] systemd[1]: start request repeated too quickly for dnsmasq-host.service
kernel: [*08/03/2020 23:47:28.6664] systemd[1]: Failed to start DNSmasq for host.
kernel: [*08/03/2020 23:47:28.6664] systemd[1]: Unit dnsmasq-host.service entered failed state.
kernel: [*08/03/2020 23:47:28.6664] systemd[1]: dnsmasq-host.service failed.
kernel: [*08/03/2020 23:47:28.6963] systemd[1]: Starting AP process failure for ...
kernel: [*08/03/2020 23:47:28.6963] systemd[1]: Reached target Failure target.
kernel: [*08/03/2020 23:47:28.6963] systemd[1]: Starting Failure target.
kernel: [*08/03/2020 23:47:28.8163] 
kernel: [*08/03/2020 23:47:28.8163] 
kernel: [*08/03/2020 23:47:28.8163] Critical process has crashed repeatedly, This will result in reboot of system
kernel: [*08/03/2020 23:47:28.8163] You have 20 seconds to run this to stop the reboot. Good luck
kernel: [*08/03/2020 23:47:28.8163] 
kernel: [*08/03/2020 23:47:28.8163] freeze -w

8540 WLC running on 8.5 train with 1832 model AP's
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