I am running the code under TESTAUTH it's a concurrent server with 4
subtasks

As soon as the ECB wait bit gets set I attach the next

After the first task hits this point 

I attached the second which right away has TCBSER on 

And I don't see any abend on the console


RD_TASK_LOOP DS 0H

*

                                                    
        LA     R10,EZASMGW          GLOBAL WORK AREA

        STC    R6,TASK_ADDR

        OI     TASK_ADDR,X'F0'

*       LA     R15,NOW.TIE_DSECT

*       MVC    E$ASMTOK-MYTIE(L'E$ASMTOK,R15),E$ASMTOK

        ST     R11,ECB_ADDR

        ST     R9,END_ECB

*       L      R14,COMMADDR         Get Communication Address

        MVC    CLEANUP,=A(CLEAN_UP)

*       USING  COM,R14

*       MVC    NOW.END_ECB,COMECBPT     Store Commincation ecb

.ATT    ANOP

        ATTACH EP=DBGRTSK,                                             X

               PARAM=((R10),(R7),CLIENT,SOCKTBL),                      
             ECB=SYSECB,                                             X

               SZERO=YES,                                              X

               SVAREA=YES,                                             X

               ASYNCH=NO,                                              X

               ESTAI=(R12),                                            X

               ALCOPY=NO,MF=(E,PARM),SF=(E,ATT_LIS)

        LTR   R15,R15              ALL OKAY

        BZ    SET_TCB              STORE TCB ADDRESS

        WTO   'PROBLEM CREATING TASKS..'

        B      RETURN

SET_TCB DS    0H

        LR    R8,R1                 HOLD TCB

IS_WAIT DS    0H   
       L    R10,0(,R7)   
       TM   0(R10),X'80'

       BO    ST_TCB              A; NO; WAIT

*

       STIMER   WAIT,DINTVL=LTINTVL   WAIT A BIT

*

       B     IS_WAIT

ST_TCB DS    0H

       STCM   R8,B'0111',TASK_ADDR+1 STORE TCB ADDRESS

*

*

TEMP8  DS    0H

       LA    R7,THREAD_LEN(,R7)    BUMP UP Storage for threads

       LA    R11,4(,R11)             Bump up end ecb addr

       LA    R9,4(,R9)             Bump ecb address

       BCT   R6,RD_TASK_LOOP






                                                             -----Original
Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of
Binyamin Dissen
Sent: Monday, June 8, 2026 11:56 AM
To: [email protected]
Subject: Re: Subtask not getting dispatched

How do you know that it never took off?

What basic debugging or tracing have you done?

On Mon, 8 Jun 2026 10:54:51 -0400 Joseph Reichman
<[email protected]> wrote:

:>Hi
:>
:>I attach a subtask get a TCB however the subtask never takes off :> :>My
only hint is that TCBSER of TCBFLGS4 :> :>Is on for TCB that never got
dispatched :> :>Can anyone give me a clue how to get to the bottom of this
:>
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--
Binyamin Dissen <[email protected]>
http://www.dissensoftware.com

Director, Dissen Software, Bar & Grill - Israel

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