Seeing this in recent master. It seems to recover after a restart.
ium/bpf/include -D__NR_CPUS__=2 -DENABLE_ARP_RESPONDER=1 -DHANDLE_NS=1 -DFROM_HOST -DSECLABEL=1 -DBPF_PKT_DIR=0 '-DNODE_MAC={.addr={0x8e,0xdc,0x4e,0x28,0xc5,0x82}}' -DCALLS_MAP=cilium_calls_netdev_ns_1 -c /var/lib/cilium/bpf/bpf_netdev.c -o -" subsys=datapath-loader
level=warning msg="+ tc qdisc replace dev cilium_host clsact" subsys=datapath-loader
level=warning msg="++ grep -v 'pref 1 bpf chain 0 $\\|pref 1 bpf chain 0 handle 0x1'" subsys=datapath-loader
level=warning msg="++ tc filter show dev cilium_host egress" subsys=datapath-loader
level=warning msg="+ '[' -z '' ']'" subsys=datapath-loader
level=warning msg="+ cilium-map-migrate -s bpf_host.o" subsys=datapath-loader
level=warning msg="+ set +e" subsys=datapath-loader
level=warning msg="+ tc filter replace dev cilium_host egress prio 1 handle 1 bpf da obj bpf_host.o sec from-netdev" subsys=datapath-loader
level=warning msg="Map object 'cilium_ipv4_frag_datagrams' rejected: Unknown error 524 (524)!" subsys=datapath-loader
level=warning msg=" - Type: 9" subsys=datapath-loader
level=warning msg=" - Identifier: 0" subsys=datapath-loader
level=warning msg=" - Pinning: 2" subsys=datapath-loader
level=warning msg=" - Size key: 12" subsys=datapath-loader
level=warning msg=" - Size value: 4" subsys=datapath-loader
level=warning msg=" - Max elems: 8192" subsys=datapath-loader
level=warning msg=" - Flags: 0x1" subsys=datapath-loader
level=warning subsys=datapath-loader
level=warning msg="Error loading maps into kernel!" subsys=datapath-loader
level=warning msg="Error fetching ELF ancillary data!" subsys=datapath-loader
level=warning msg="Unable to load program" subsys=datapath-loader
level=warning msg="+ RETCODE=1" subsys=datapath-loader
level=warning msg="+ set -e" subsys=datapath-loader
level=warning msg="+ cilium-map-migrate -e bpf_host.o -r 1" subsys=datapath-loader
level=warning msg="+ return 1" subsys=datapath-loader
level=error msg="Error while initializing daemon" error="exit status 1" subsys=daemon
level=fatal msg="Error while creating daemon" error="exit status 1" subsys=daemon
level=debug msg="Controller func execution time: 15.044µs" name=metricsmap-bpf-prom-sync subsys=controller uuid=2a6c9d38-7aaf-11ea-a138-0258a0fe1826
Seeing this in recent master. It seems to recover after a restart.