This article explains the meaning of the Syslog message, 'QX-chip(1): scheduler 1 - internal memory error​'  and the effects of the error on the device.

Syslog messages :

Aug 21 08:37:05  Router_RE0 fpc2 QX-chip(1): scheduler 1 - internal memory error 
Aug 21 08:37:05  Router_RE0 fpc2 QX-chip(1): scheduler 1 - L2 addr:0x00000000 L2 data:0x00000000 L3 addr:0x000002e1 L3 data:0x00000002 
Aug 21 08:37:06  Router_RE0 fpc2 QX-chip(1): scheduler 1 - internal memory error 

Check for active alarms:

Router_RE0> show chassis alarms no-forwarding
No alarms currently active

There won't be any alarms present due to this error:

Detailed logs:

Aug 21 08:37:05  Router_RE0 fpc2 QX-chip(1): scheduler 1 - internal memory error
Aug 21 08:37:05  Router_RE0 fpc2 QX-chip(1): scheduler 1 - L2 addr:0x00000000 L2 data:0x00000000 L3 addr:0x000002e1 L3 data:0x00000002
Aug 21 08:37:06  Router_RE0 fpc2 QX-chip(1): scheduler 1 - internal memory error
Aug 21 08:37:06  Router_RE0 fpc2 QX-chip(1): scheduler 1 - L2 addr:0x00000000 L2 data:0x00000000 L3 addr:0x00000000 L3 data:0x00000000
Aug 21 08:59:22  Router_RE0 kmd: ui_client_connect_to_kmd_instance: KMD-SHOW connect to kmd-instance failed kmd-instance RE, fpc slot 0, pic slot 0
Aug 21 08:59:22  Router_RE0 kmd: ui_client

Recommendation:

The above log messages indicate a memory issue with the QX chip of FPC. These logs have an impact where the particular QX chip stops forwarding traffic.
It is recommended to reload FPC during a safe window to clear the 'internal memory error'.