NSQuamber.java NSQuamber.java - 1 year ago 78
C Question

Unable to Run application via Terminal but application working fine in XCode

I am working on lilgp which is a c language based tool for Genetic Programming. The problem that i am facing is that I am using XCode for the project and it is working fine and shows correct output via terminal. But when i try to run the same application in

of my project in XCode i get segmentation fault (11)

Then i have checked the console in Utilities for errors which shows error like this

Process: Theisis [9325]
Path: /Users/USER/Library/Developer/Xcode/DerivedData/Theisis-gszeehddtmnlkqdbicpeffygvkcw/Build/Products/Release/Theisis
Identifier: Theisis
Version: 0
Code Type: X86-64 (Native)
Parent Process: bash [8987]
Responsible: Terminal [299]
User ID: 501

Date/Time: 2016-09-11 01:05:25.158 +0500
OS Version: Mac OS X 10.11.6 (15G31)
Report Version: 11
Anonymous UUID: 4063B9C3-F525-D9BD-EF5E-358810571673

Sleep/Wake UUID: CA5341A7-C252-4C76-B694-7F2DAE196F79

Time Awake Since Boot: 57000 seconds
Time Since Wake: 1600 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000068

VM Regions Near 0x68:
__TEXT 0000000100c4e000-0000000100c6a000 [ 112K] r-x/rwx SM=COW /Users/USER/Library/Developer/Xcode/DerivedData/Theisis-gszeehddtmnlkqdbicpeffygvkcw/Build/Products/Release/Theisis

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_c.dylib 0x00007fff93a8b09e flockfile + 4
1 libsystem_c.dylib 0x00007fff93a8d463 fscanf + 156
2 Theisis 0x0000000100c57853 app_initialize + 195 (app.m:614)
3 Theisis 0x0000000100c4f245 main + 453 (main.m:205)
4 libdyld.dylib 0x00007fff8e0575ad start + 1

Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x00007fff5efb1970 rbx: 0x0000000000000000 rcx: 0x00000b0000000000 rdx: 0x0000000100c6aa8c
rdi: 0x0000000000000000 rsi: 0x0000000100c675d4 rbp: 0x00007fff5efb1860 rsp: 0x00007fff5efb1860
r8: 0x00000000fffffffc r9: 0x00007fff740b1c10 r10: 0x00007fff97709e01 r11: 0x00007fff93a8d3c7
r12: 0x450022575a4d98d4 r13: 0x0000000000000000 r14: 0x0000000100c675d4 r15: 0x0000000000000000
rip: 0x00007fff93a8b09e rfl: 0x0000000000010246 cr2: 0x0000000000000068

Logical CPU: 4
Error Code: 0x00000004
Trap Number: 14

VM Region Summary:
ReadOnly portion of Libraries: Total=176.1M resident=0K(0%) swapped_out_or_unallocated=176.1M(100%)
Writable regions: Total=19.6M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=19.6M(100%)

REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 2048K 2
Kernel Alloc Once 4K 2
MALLOC 9604K 17
Stack 64.0M 3
__DATA 8300K 141
__LINKEDIT 91.4M 4
__TEXT 84.7M 146
__UNICODE 552K 2
shared memory 8K 3
=========== ======= =======
TOTAL 260.2M 312

However, when i checked app.m:614 it has
if (strcmp(c, "regress_asim") != 0) {
where c is a chracter array and this array is working fine from last couple of months and in XCode too. Can anybody tell me what am i missing?


1) The Resolved Project settings for both Debug and Release are same (except for the binary paths for sure)

2) Code not only works in XCode but is also working in eclipse and creating a working binary.

3) The part of the code that crashes in that the array

Declared as

char c[100];

Initillized as

strncpy(c, "Equation_Default_data.csv", sizeof(c));

The code block where it crashes

if (!startfromcheckpoint) {
oprintf( OUT_PRG, 50, "not starting from checkpoint file.\n");

param = get_parameter("app.fitness_cases");
if (param == NULL)
fitness_cases = 200;
else {
fitness_cases = atoi(param);
if (fitness_cases < 0)
"invalid value for \"app.fitness_cases\".");
FILE *in_file = fopen(c, "r");
fscanf(in_file, "%d", &fitness_cases);
if (strcmp(c, "regress_asim") != 0) { //Line 614
app_y_desired = (double *) MALLOC(fitness_cases * sizeof(double));
app_fitness_cases[0] = (double *) MALLOC(
fitness_cases * sizeof(double));
app_fitness_cases[1] = (double *) MALLOC(
fitness_cases * sizeof(double));
app_fitness_cases[2] = (double *) MALLOC(
fitness_cases * sizeof(double));
app_fitness_cases[3] = (double *) MALLOC(
fitness_cases * sizeof(double));

memset(app_fitness_cases[2], 0, fitness_cases * sizeof(double));
memset(app_fitness_cases[3], 0, fitness_cases * sizeof(double));
memset(app_y_desired, 0, fitness_cases * sizeof(double));

app_fitness_importance = (int *) MALLOC(fitness_cases * sizeof(int));
//Asim Code
double x, y;
for (i = 0; i < fitness_cases; ++i) {
fscanf(in_file, "%lf", &x);
fscanf(in_file, "%lf", &y);
app_fitness_cases[0][i] = x;
app_fitness_cases[1][i] = y;
if (strcmp(c, "regress_asim") != 0) {
app_y_desired[i] = y;
app_fitness_importance[i] = checkImportance(x);
datapointsPerImportance = (int*) MALLOC((max_datapoint_importance+1)*sizeof(int));
memset(datapointsPerImportance, 0, (max_datapoint_importance+1)*sizeof(int));
for (i = 0; i < fitness_cases; ++i) {
// printf("%d : %d\n",i,checkImportance(app_fitness_cases[0][i]));

for(int i=0;i<=max_datapoint_importance;i++)
printf("Importance %d =%d\n",i,datapointsPerImportance[i]);
/*oprintf( OUT_PRG, 50, "%d fitness cases:\n", fitness_cases);
for (i = 0; i < fitness_cases; ++i) {
x = (random_double() * 2.0) - 1.0;

// change this line to modify the goal function.
y = x * x * x * x + x * x * x + x * x + x;

app_fitness_cases[0][i] = x;
app_fitness_cases[1][i] = y;

// oprintf( OUT_PRG, 50, " x = %12.5lf, y = %12.5lf\n", x, y);
} else {
oprintf( OUT_PRG, 50, "started from checkpoint file.\n");

Answer Source

Without seeing the code, this is like repairing a car in absolute darkness. Try it.

However, I'll give it a try.

In the stack dump, it shows that you are using fscanf to read data from a file. Later, strcmp crashes.

The obvious idea is that fscanf reads more characters than can fit in the char array, which leaves no space for the closing \0. strcmp (or any other code, doesn't really matter) the runs past the end of the string, until it hits something sensible, and then it crashes.

If this is the reason, making the buffer longer would fix it (temporarily). Set it something huge, like 4096, to verify the approach, and then find the real fix.

If you ask why the same program would work in one place, but not in the other - you are probably reading a different file, so the content of the file has different lengths; or you simple reading the file in a different directory, which has a longer name; any of those can be the reason for the char array overflow.

Second idea: The dump line VM Regions Near 0x68 shows the memory area where it dumped, and its content looks like a part of a ls result or a path/filename (/Users/USER/Library/Developer/Xcode/DerivedData/Theisis-gsze....), so potentially your variable for that path is too short. Make that one longer too and try.

Edit: c[100] is too small, the path shown there is 115 chars. Note that .\Thesis will be replaced by \Users\... by the OS, which then is longer than 100 chars.
Declare c[260] (or even larger) and you will be good.

Recommended from our users: Dynamic Network Monitoring from WhatsUp Gold from IPSwitch. Free Download