i'm using the known crowdfunding and token contracts from ethereum.org only slightly modified

contract Token{
    function Token(tokenName,tokenValue,totalSupply){
      //assign these parameter values to contract variable by the same name; 
    function transfer(address to,uint amount){
       //perform transfer operation
contract crowdfunding{
   Token token;
    function crowdfunding(address tokenAddr){
    token = Token(tokenAddr)
    function contribute(){
    // transfer function of Token contract is called

the 2 contracts deploy just fine. when i want to execute contribute function the following thing happens

i get this error everytime i try to mine :

panic: ethash_full_new IO or memory error.
goroutine 128 [running]:
panic(0xcfae80, 0xc083c00670)
    C:/Go/src/runtime/panic.go:481 +0x3f4

and so on

what should i do?

i was getting this error therefore i deleted the chaindata and started afresh and yet the error persists.


2 Answers 2


If you have managed to mine before and this is occurring the first time check for memory intensive processes (use task manager/sysinternal suite). I had a similar issue on a machine running firefox with a large number of open tabs.

  • i have plenty memory.this error comes when i try to execute a particular function only.could it be a result of datatype difference in the code ?
    – Aditi
    Commented Aug 26, 2016 at 7:36
  • Can you please update your question with the function. It may be that you are extending an array with too many elements or are using a recursive call that has no or a buggy stopping condition.
    – Sebi
    Commented Aug 26, 2016 at 7:44

I had same issue of memory panic

I solved it by

1) Checking for the geth bit (32/64 ) I had system of 64bit and ran geth of 32bit and hence faced this issue.

2) Checking for the Storage size I had a Azure VM whose internal memory/RAM size was just 3.5GB and which is not sufficient for DAG generated and stored.

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