Experimental Physics and
Industrial Control System
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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | bug and fix in iocCore |
| From: | Dirk Zimoch <[email protected]> |
| To: | TECHTALK <[email protected]> |
| Date: | Thu, 03 Jun 2004 18:12:01 +0200 |
at least on all EPICS releases 3.13.2 to 3.13.9, is a bug that causes crashes on PPC iocs. (I have not seen a 68k crash here.)
Bug:
When reading the DTYP field of "pure soft records" such as calc via CA, the CA_client task crashes and leaves the ioc in a state where no further access via CA is possible.
data access Exception current instruction address: 0x01705f54 Machine Status Register: 0x0000b030 Data Access Register: 0xf0f0f0f0 Condition Register: 0x28000040 Data storage interrupt Register: 0x40000000 Task: 0x17c31f0 "CA_client"
> tt 17807c vxTaskEntry +60 : camsgtask () 1727a44 camsgtask +2e4: camessage () 172a7f0 camessage +120: read_action () 17286bc read_action +e8 : read_reply () 17284b4 read_reply +144: db_get_field () 171f838 .L198 +40 : dbGetField () 1707650 dbGetField +164: dbGet () 1707760 dbGet +cc : getOptions () 17065d8 getOptions +208: get_enum_strs ()
Fix:
*** base/src/db/dbAccess.c.orig Thu Jun 3 18:04:26 2004
--- base/src/db/dbAccess.c Thu Jun 3 18:10:33 2004
***************
*** 129,134 ****
--- 129,138 ----
goto choice_common;
case DBF_DEVICE:
pdbDeviceMenu = (dbDeviceMenu *)pdbFldDes->ftPvt;
+ if (pdbDeviceMenu == NULL) {
+ no_str = 0;
+ goto choice_common;
+ }
no_str = pdbDeviceMenu->nChoice;
papChoice = pdbDeviceMenu->papChoice;
goto choice_common;After this fix, calc records and the like report DTYP as 0.
Dirk
-- Dr. Dirk Zimoch Swiss Light Source Paul Scherrer Institut Computing and Controls phone +41 56 310 5182 fax +41 56 310 4413
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