Experimental Physics and
Industrial Control System

Noboru Yamamoto <[email protected]> · Wed, 17 Nov 1999 19:38:35 +0900

Hi,

We occasionary encounter the following error messages on IOC.

CA event: A call to "assert (ev_que->evUser->nDuplicates>=1u)" failed in
../dbEvent.c at 977
Please send a copy of the output from "tt (0xddc5f0)" and a copy of this message
to the author or "[email protected]"
This problem occurred in "@(#)Version R3.13.1.1 $$Date: 1999/05/13
05:35:28 $$"
filename="../taskwd.c" line number=176
task ddc5f0 CA event suspended

-> tt (0xddc5f0)
173f5c vxTaskEntry    +60 : event_task ()
1c96778 event_task     +100: 1c96928 ()
1c96a68 event_task     +3f0: epicsAssert ()
1cb4320 epicsAssert    +d4 : taskSuspend ()
value = 0 = 0x0
-> ti (0xddc5f0)

  NAME        ENTRY       TID    PRI   STATUS      PC       SP     ERRNO
 DELAY
---------- ------------ -------- --- ---------- -------- --------
------- -----
CA event   event_task     ddc5f0  49 SUSPEND+I    16f230   ddc510      
0     0

stack: base 0xddc5f0  end 0xddb208  size 4816   high 2840   margin 1976

options: 0xc
VX_DEALLOC_STACK    VX_FP_TASK

r0     =  160620c   sp     =   ddc510   r2     =        0   r3     =    
   0
r4     =    fcfbe   r5     =       32   r6     =        0   r7     =    
   3
r8     =        2   r9     =       64   r10    =        1   r11    =    
   0
r12    =        2   r13    =        0   r14    =        0   r15    =    
   0
r16    =        0   r17    =        0   r18    =        0   r19    =    
   0

As you see, this error suspend "CA event" task and noone can open new CA
connection on this IOC, resulting IOC reboot.
In the tech-talk archive, I can find the similar but slightly different
post shown bellow.

> 
> Hi Rosemary,
> I think you must be running the sequencer and 
> there may be a problem with it.  
> 
> There were several bugs fixed in the sequencer between the
> versions sent out with Beta11 and the one sent out with Beta12
> and there is also a special version that William Lupton at Keck
> is using, so it would be helpful to know which one you have.
> 
> 
> 
> When you first start
> up the sequencer on the ioc by
> typing 
> seq &<your sequence program name>
> it should tell you what version you are using. 
> 
> In my case I type:
>  seq & llrfFillHistory
> and it replies:
> @(#)SNC/SEQ Version 1.9.2.Beta12 : Fri Sep  4 10:42:22 1998
> which means it is Version 1.9.2.Beta12.
>   
> Could you please tell us what Version of the sequencer you are using?
> 
> 
> Thanks,
> Rozelle
> 
> ---------------------------------------------------------
> |                                                       |
> |Rozelle Wright              Phone (505) 667-4804       |
> |Los Alamos Natl Labs LANSCE-8  FAX (505) 665-5107      |
> |PO Box 1663 MS-H820         Group Office (505) 667-6087|
> |Los Alamos, NM 87545        email : [email protected]   |
> |                                                       |
> ---------------------------------------------------------
>   
> 
> 
> 
> 
> > From [email protected] Mon Oct  5 21:06 MDT 1998
> > Date: Mon, 5 Oct 1998 17:00:47 -1000
> > To: [email protected]
> > Subject: Failure of assert within dbEvet.c
> > Content-Type: text
> > Content-Length: 1095
> > X-Lines: 36
> > 
> > 
> > 
> > Aloha,
> > 
> > Any ideas with regard to the below?  
> > 
> > 
> > ------------------------------------------------------------
> > EV seqAux: A call to "assert (ev_que->evUser->nDuplicates>=1u)" failed in ../dbEvent.c at 1036
> > Please send a copy of the output from "tt (0xb635d8)" and a copy of this message
> > to the author or "[email protected]"
> > This problem occurred in "@(#)Version R3.13.0.beta.11 $$Date: 1997/07/14 14:04:12 $$"
> > 
> > 
> > ###################################
> > cp_control (ready): offset
> > task: 0Xc7b338 taskwd
> > task b635d8 EV seqAux suspended
> > 
> > 
> > -> tt (0xb635d8)
> >  2cb98 _vxTaskEntry   +c  : _event_task (c4e188, a63478, b6ce60, 0, 0, 0)
> > e5367c _event_task    +cc : e53858 (a63478, ffffffff, 0, b2000, 4401fc3, 8)
> > e53968 _event_task    +3b8: _epicsAssert (e53130, 40c, e53838, 0, e7a208, 4)
> > e6fcd8 _epicsAssert   +8c : _taskSuspend (0, e6fc10, e53838, e53130, 40c, &_dtiPixX)
> > value = 0 = 0x0
> > ->    
> > ------------------------------------------------------------
> > 
> > Mahalo,
> > Rosemary Alles
> > Software Engineer
> > Canada France Hawaii Telescope
> > e-mail: <[email protected]>
> > Phone : 808-885-3178
> > Fax   : 808-885-7288
> > 

 Does anyone have any idea to avoid this error ?

Thanks, 

Noboru Yamamoto
KEKB control group
KEK, Accelerator Lab.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System