On 9/14/2019 12:11 PM, Fred Smith wrote:
Hi all!
I’m new to this list, but have used Valgrind many times in the past.
Today I’m making a serious effort to clean up a non-trivial body of
code, and have run into a number of error reports like this one:
==00:00:00:11.329 1533== Conditional jump or move depends on
uninitialised value(s)
==00:00:00:11.329 1533== at 0x7B0BCC2: ttci2n (in
/home/interface/interface/oralib-12/lib/libclntsh.so.12.1)
==00:00:00:11.329 1533== by 0x7B20DF5: ttcacs (in
/home/interface/interface/oralib-12/lib/libclntsh.so.12.1)
==00:00:00:11.329 1533== by 0x7AF2503: ttcdrv (in
/home/interface/interface/oralib-12/lib/libclntsh.so.12.1)
==00:00:00:11.329 1533== by 0x7AE14C8: nioqwa (in
/home/interface/interface/oralib-12/lib/libclntsh.so.12.1)
==00:00:00:11.329 1533== by 0x7AC35CB: upirtrc (in
/home/interface/interface/oralib-12/lib/libclntsh.so.12.1)
==00:00:00:11.329 1533== by 0x7ACDDE5: kpurcsc (in
/home/interface/interface/oralib-12/lib/libclntsh.so.12.1)
==00:00:00:11.329 1533== by 0x7AC710D: kpuexec (in
/home/interface/interface/oralib-12/lib/libclntsh.so.12.1)
==00:00:00:11.329 1533== by 0x7AC3F78: OCIStmtExecute (in
/home/interface/interface/oralib-12/lib/libclntsh.so.12.1)
==00:00:00:11.329 1533== by 0x45078D: HS_do_OCI_stuff (HS_oci.c:1460)
==00:00:00:11.329 1533== by 0x407DA0: HS_send2HS (HS_thr_out.c:261)
==00:00:00:11.329 1533== by 0x4083BB: HS_convertandsend
(HS_thr_out.c:468)
==00:00:00:11.329 1533== by 0x40884E: HS_out_msg (HS_thr_out.c:629)
==00:00:00:11.329 1533== by 0x40913C: HS_out_main (HS_thr_out.c:933)
==00:00:00:11.329 1533== by 0x409797: HS_main_out (HS_thr_out.c:1172)
==00:00:00:11.329 1533== by 0x9C50DD4: start_thread
(pthread_create.c:307)
==00:00:00:11.329 1533== Uninitialised value was created by a stack
allocation
==00:00:00:11.329 1533== at 0x407C67: HS_send2HS (HS_thr_out.c:231)
==00:00:00:11.329 1533==
The problem with that report is that line 231 contains no explicit code:
static HS_IF_STATE HS_send2HS (HS_out_thread * myoutthr,
HS_MSGBUF * msgbuf,
HS_IF_PARMS * ifparms,
xmlChar * xmlbufptr,
char * HS_resp,
HS_patdat * patdat,
char * databuf)
{ ç line 231
HS_IF_STATE status = OK;
int success, warnings;
int numtries = 0
I can’t find anything that’s allocated in that function that would be
un-initialized later in the program, and I don’t know what it thinks
is on line 231.
Advice will be appreciated, thanks in advance!
The allocation is probably in the function's stack frame, which would be
set up at function entry. The compiler probably assigned line 231 to
that task. I see line 261 in your call stack; what local variables does
it use?
--
David Chapman dcchap...@acm.org
Chapman Consulting -- San Jose, CA
EDA Software Developer, Expert Witness
www.chapman-consulting-sj.com
2018-2019 Chair, IEEE Consultants' Network of Silicon Valley
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