Re: Garbage collector: Out of memory (when running AWT/SWING code on arm-linux)

[Andrew Haley <aph at redhat dot com>]

ffileppo wrote:
>> ffileppo wrote:
>>>> Hi guys,
>>>>
>>>> I'm getting the following error:
>>>>
>>>> GC Warning: Out of Memory! Returning NIL!
>>>>
>>>> when I try to run any AWT/SWING code compiled with arm-linux-gcj on my embedded box (PXA270 - 128MB Ram). (Other code just runs fine)
>>>>
>>>> For example this code:
>>>>
>>>> import javax.swing.*;
>>>>
>>>> public class SimpleFrame {
>>>>   public static void main(String args[]) {
>>>>     System.out.println("Check 1");
>>>>     JFrame f = new JFrame("Simple Frame");
>>>>     System.out.println("Check 2");
>>>>     f.setSize(200,100);
>>>>     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
>>>>     f.setVisible(true);
>>>>   }
>>>> }
>>>>
>>>> gives out of memory error after printing "Check 1".
>>>> Trying with some other code I can see that the first AWT/SWING call causes this error.
>>>>
>>>> Any idea to fix / debug this problem?
>> I think I've found it.  The unwinder is infinitely looping 'til it runs out
>> of memory.
>>
>> Some library somewhere has probably has invalid unwind information.
>>
>> Add this line to _Jv_StackTrace::UnwindTraceFn in stacktrace.cc:
>>
>> *** stacktrace.cc~      Tue Sep  4 19:00:31 2007
>> --- stacktrace.cc       Fri Jun  6 17:42:25 2008
>> ***************
>> *** 110,115 ****
>> --- 110,117 ----
>>     // Check if the trace buffer needs to be extended.
>>     if (pos == state->length)
>>       {
>> +       return _URC_END_OF_STACK;
>> +
>>         int newLength = state->length * 2;
>>         void *newFrames = _Jv_AllocBytes (newLength * sizeof(_Jv_StackFrame));
>>         memcpy (newFrames, state->frames, state->length * sizeof(_Jv_StackFrame));
>>
>> This will prevent more than 100 stack frames from being traced.

> 
> I confirm it's working now.
> 
> Thank you Andrew, you saved me...again

OK, right.  I'm going to have to fix this one properly: it's a serious bug
that prevents anyone from running any GUI applications on gcj/ARM eabi.

Andrew.