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Subject: Segmentation fault at dbConvert.c in Ubuntu 32/64 bit
From: Carsten Winkler <carsten.winkler@helmholtz-berlin.de>
To: <tech-talk@aps.anl.gov>
Date: Mon, 20 Feb 2017 15:40:27 +0100
Hi there,

I always run into a  "Segmentation fault" in function "putFloatString" |
"putDoubleString" of BASE/src/db/dbConvert.c

When I comment out following lines (call of get_precision) everything is
working again:
3947
3948
4157
4158

Test system
=================================================
Ubunu 16.04 (64 bit)
EPICS BASE 3.14.12.6 (64 bit)


To check the error, I used this code:
test.cpp
=================================================

#include <malloc.h>
#include <cadef.h>
//#define DOUBLE

using namespace std;

int main() {
    chid chanID;
    int iNumber = 1;
    int timeout = 0;
    void *pValue = 0x0;

    ca_context_create(ca_enable_preemptive_callback);
#if defined DOUBLE
    pValue = (double*)malloc(iNumber*sizeof(double));
    for(int i=0; i<iNumber; i++) {
        ((double*)pValue)[i] = (double)((1+i)*3.1415926535897);
    }
#else
    pValue = (float*)malloc(iNumber*sizeof(float));
    for(int i=0; i<iNumber; i++) {
        ((float*)pValue)[i] = (float)((1+i)*3.1415926535897);
    }
#endif
    ca_create_channel("caLab:waveString", 0, 0, 50, &chanID);
    timeout = 3000;
    while(ca_state(chanID) != cs_conn && timeout--) {
        epicsThreadSleep(.001);
    }
#if defined DOUBLE
    ca_array_put(DBR_DOUBLE, 1, chanID, pValue);
#else
    ca_array_put(DBR_FLOAT, 1, chanID, pValue);
#endif
    ca_context_destroy();
    free(pValue);
    return 0;
}

g++ -I/usr/local/epics/base-3.14.12.6/include/os/Linux
-I/usr/local/epics/base-3.14.12.6/include -O0 -g3 -Wall -c
-fmessage-length=0 -MMD -MP -MF"test.d" -MT"test.d" -o "test.o" "test.cpp"
g++ -L/usr/local/epics/base-3.14.12.6/lib/linux-x86_64 -o "test"
test.o   -lCom -lca

Any advice to solve this issue?

Best regards
Carsten Winkler

PS Same problem in 32 bit systems


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Replies:
Re: Segmentation fault at dbConvert.c in Ubuntu 32/64 bit Carsten Winkler

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