Issue While Executing Stored Procedures

I would be grateful if someone can provide some kind of explanation over why this issue has happened.

I had the following statements in a query window.

exec dbo.usp_sProc1
go
exec dbo.usp_sProc2

go
exec dbo.usp_sProc3
go


In order to monitor the progress of each procedure, I have a table called progress_log into which each step executing in the procedure is written. Each procedure has a "Begin" and "End" text written to this progress_log.

When I clicked the execution button on the window, I made the assumption that each stored procedure will finish before the next one executes. However something different happened.


The progress_log shows the following

S/N proc_Name Step
1 sProc1 Begin
2 sProc1 sProctep1
3 sProc1 sproc1: Step2

4 sproc1 sproc1tep3
5 sProc2 sproc2:Begin
6 sProc2 sProc2tep1
7 sproc2 sProc2tep2
8 sproc2 sproc2:End
9 sProc3 Begin
10 sProc3 Sproc3: Step1


From the above (S/N: 5) , it can be seen that the procedure did not finish executing Sproc1 because there was no "END" statement written to the Progress_Log before the "Begin" statement of SProc2.

On checking the error_log, I found there were no errors in the stored procedure. However, a message was written to the query window about insufficient space on the database at S/N:10 in the log above.

How is it possible that the Sproc2 stored procedure can be started without the Sproc1 stored procedure having ended?

I can give more explanation if not clear.

many thanks for any help