Solution : https://service.sap.com/sap/support/notes/1115861 (SAP Service marketplace login required)
Key words :
patch level 138sap web application server, patch level 82sap netweaver 2004s, static profile parameter rfc/inb_sched_resource_threshold, terms rfc/inb_sched_resource_threshold reason, profile parameter rfc/inb_sched_resource_threshold, competing processes receive resources, resource bottleneck occurred, kernel patch levels, qrfc inbound scheduler, patch level 210
Related Notes :
1324454 | qRFC scheduler is still set to WAITING status |