ebpf: delete entry from map for off cpu sampling

support/ebpf/off_cpu.ebpf.c

@@ -82,6 +82,10 @@ int finish_task_switch(struct pt_regs *ctx)
     return 0;
   }
 
+  // Remove entry from the map so the stack for the same pid_tgid does not get unwound and
+  // reported accidentally without the start timestamp updated in tracepoint/sched/sched_switch.
+  bpf_map_delete_elem(&sched_times, &pid_tgid);
+
   u64 diff = ts - *start_ts;
   DEBUG_PRINT("==== finish_task_switch ====");