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When a process is down - how to get a coredump in arm board?


 
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# 1  
Old 03-01-2010
When a process is down - how to get a coredump in arm board?

Running a multi-threaded program in my arm board one day or more ,The process down .
In order to get a coredump to analysis of the stack , . I use commands ulimited -c unlimited .
but when the process down . no coredump

But I write a test

Code:
#include <stdio.h>
int main(void){
    int m = 0;
    scanf("%d",m);
    return 0;
}

input a number , coredump generated .




why?

Last edited by pludi; 03-02-2010 at 02:54 AM.. Reason: code tags, please...
# 2  
Old 03-02-2010
ulimit -c 100

Quote:
while executing the ulimit command , you need give some value for -c option .
Here -c option value is for saying the approximate size of the dump file
Then you run the segmentation fault object file , it would give you core dumped file
example:
$ ulimit -c 100
$ cc file.c
$ a.out
43
Segmentation fault (core dumped)

Last edited by pavun_cool; 03-02-2010 at 02:59 AM.. Reason: Adding some statements
# 3  
Old 03-02-2010
Quote:
Originally Posted by pavun_cool
example:
$ ulimit -c 100
$ cc file.c
$ a.out
43
Segmentation fault (core dumped)
yes I know the test example I wrote can get a coredump .

The question is why my multi-threaded process can't get a coredump when it down or collapsed Smilie

Thanks !
# 4  
Old 03-03-2010
Possible answers

The user running the app has a ulimit setting to prevent it - environment setting
You linked against an object that blocks SIGSEGV/SIGBUS
You block SIGSEGV/SIGBUS in your code somewhere

I do not know much about ARM. When you execute the image file is there some separate environment in which it runs? To check resource settings:
ex:
Code:
struct rlimit rlp;
if(getrlimit(RLIMIT_CORE, rlp)==0)
    fprintf(stdout, "core dump blocked\n");

I would guess this is the first place to look, and if this is not the case then it pretty much has to be signal blocking somewhere.
# 5  
Old 03-03-2010
Quote:
Originally Posted by jim mcnamara
Possible answers

The user running the app has a ulimit setting to prevent it - environment setting
You linked against an object that blocks SIGSEGV/SIGBUS
You block SIGSEGV/SIGBUS in your code somewhere

I do not know much about ARM. When you execute the image file is there some separate environment in which it runs? To check resource settings:
ex:
Code:
struct rlimit rlp;
if(getrlimit(RLIMIT_CORE, rlp)==0)
    fprintf(stdout, "core dump blocked\n");

I would guess this is the first place to look, and if this is not the case then it pretty much has to be signal blocking somewhere.
Quote:
The user running the app has a ulimit setting to prevent it - environment setting
I use " ulimit -c unlimited ", not" ulimit -c 100 "or something else .

Quote:
You block SIGSEGV/SIGBUS in your code somewhere
I can use functions setjmp, longjmp ,and signal to catch SIGSEGV/SIGBUS and do anything i want .
Even so , I don't know the place generate SIGSEGV/SIGBUS
Code:
struct rlimit rlp;
if(getrlimit(RLIMIT_CORE, rlp)==0)
    fprintf(stdout, "core dump blocked\n");

I use ulimit -a to display the setting , It's right !

/proc/sys/fs $ ulimit -a
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) unlimited
stack(kbytes) 2040
coredump(blocks) unlimited
memory(kbytes) unlimited
locked memory(kbytes) 32
process 768
nofiles 1024
vmemory(kbytes) unlimited
locks unlimited
/proc/sys/fs $

Last edited by aobai; 03-03-2010 at 11:31 PM..
# 6  
Old 03-04-2010
Yes, we know, but something in the program or in a library you use may be modifying those limits as well. Doesn't hurt to double-check.

Are you already catching SIGSEGV then?
# 7  
Old 03-06-2010
Quote:
Originally Posted by aobai
Running a multi-threaded program in my arm board one day or more ,The process down .
In order to get a coredump to analysis of the stack , . I use commands ulimited -c unlimited .
but when the process down . no coredump

But I write a test <snip> input a number , coredump generated .

why?
Perhaps no enough space available on the flash to write the core dump?

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