I think that bit is TCBAREQ in TCBNDSP3. Lennie -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Attila Fogarasi Sent: 09 June 2026 10:26 To: [email protected] Subject: Re: Subtask not getting dispatched
take a dump and check the TCBNDSP and TCBSTP fields (any bit on will prevent dispatch). TESTAUTH used to have a "feature" that ATTACH from a non-APF authorized library will cause unpredictable results, including non-dispathch (supposed to cause S306 abend). Don't know if this is still the case, but somewhat matches your symptom. On Tue, Jun 9, 2026 at 4:45 AM Joseph Reichman < [email protected]> wrote: > I have a breakpoint at the entry point of the subtask > > > So after I do the first attach it goes right there > > For second I it never does I do listtcb with the TCB ADDR and tcbser > is on > > Rob gave me a good idea if you have ideas how how I would debug this > please share > > Thanks > > > Joe Reichman > > On Mon, Jun 8, 2026 at 2:34 PM Binyamin Dissen < > [email protected]> wrote: > > > That doesn't answer the questions. > > > > How do you know that it never took off? > > :> > > What basic debugging or tracing have you done? > > > > Did you try GTFing your code? Did you examine the task structure > > from a DUMP? > > > > Possible issues with your code. > > > > Are SYSECB and PARM unique for each occurrence of ATTACH? > > > > > > > > > > > > On Mon, 8 Jun 2026 13:17:22 -0400 Joseph Reichman > > <[email protected]> wrote: > > > > :>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 :>:> > > > :>:>------------------------------------------------------------------ > ---- > > :>:>For IBM-MAIN subscribe / signoff / archive access instructions, > :>send > > :>email to [email protected] with the message: INFO IBM-MAIN > > > > -- > > Binyamin Dissen <[email protected]> > > http://www.dissensoftware.com > > > > Director, Dissen Software, Bar & Grill - Israel > > > > -------------------------------------------------------------------- > > -- For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO > > IBM-MAIN > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
