Space pointer error

[petersioufi]

Hi Support,

We're having internal pointer error problems that we can't trace. I've been able to trace a job log showing following:

Message ID . . . . . . : MCH0601 Severity . . . . . . . : 40
Message type . . . . . : Escape
Date sent . . . . . . : 22/04/20 Time sent . . . . . . : 12:28:39

Message . . . . : Space offset X'00000000' or X'0000000DB93A9AC0' is outside
current limit for object VALENCE52PQTMHHTTP 032979.
Cause . . . . . : A program tried to set a space pointer, tried to use
storage outside a space, or tried to use an unallocated page in teraspace.
The space class is X'07'. The space class designates the type of space:
00-primary associated space (includes space objects).
01-secondary associated space 0.
02-implicit process space for automatic storage.
03-implicit process space for static storage in activation group mark
X'0000000000000000'.
04-implicit process space for heap identifier X'00000000' in activation
group mark X'0000000000000000'.
05-constant space.
06-space for handle-based heap identifier X'00000000'.
07-teraspace offset X'0000000DB93A9AC0'.
08-teraspace for System i5 PASE memory address X'0000000DB93A9AC0'.
Offset X'00000000' only applies to storage outside teraspace.
X'80000000000000000000000DB93A9AC0' is a pointer to the teraspace page or
the start of the implicit process space for the allocation.

Doing F9 to show message details reveals:

Message ID . . . . . . : MCH0601 Severity . . . . . . . : 40
Date sent . . . . . . : 22/04/20 Time sent . . . . . . : 12:38:39
Message type . . . . . : Escape
From . . . . . . . . . : QTMHHTP1 CCSID . . . . . . . . : 65535

From program . . . . . . . . . : ARRAYLIST
From library . . . . . . . . : VALENCE52P
From module . . . . . . . . : ARRAYLIST
From procedure . . . . . . . : arraylist_get
From statement . . . . . . . : 417

To program . . . . . . . . . . : ARRAYLIST
To library . . . . . . . . . : VALENCE52P
To module . . . . . . . . . : ARRAYLIST
To procedure . . . . . . . . : arraylist_get
To statement . . . . . . . . : 417


I think this causes HTTP server to slow down because users complain. But the job remains active and continues anyway, users just try again.

[robert.swanson]

Hi Peter,

This appears to be coming from the JSON parse utility. Do any of your programs use VVJSON? Are you sure the job is not terminating or going into MSGW? Seems odd that it would just continue after a message of that severity. It would be really helpful to see a call stack at the time of the error. Is anything getting thrown into the Valence error log?

Is there a specific program or app they're using that appears to trigger this problem where the users just try again?

[petersioufi]

This will take some effort to trace because this is a live application and there are hundreds of external users. Let me do some investigation tomorrow.