BSC Transaction revert but no reason

Question

I encountered a problem. My contract occasionally has execution exceptions, but there is no error prompt. I read the VM trace and found the following errors, but I don't understand why. Can someone help me? t https://bscscan.com/vmtrace?txhash=0x4a0b818dcf9c67289e28215a2deb0f1e18e6e50a5d13d86d94d6bd6e9d96996a

Ismael · Accepted Answer · 2021-08-25 04:03:19Z

1

The contract is running out of gas.

The line where the error is show:

Operation      Gas   GasCost
----------------------------
EXTCODESIZE    44       700

The available gas at that point is 44, and EXTCODESIZE requires 700.

answered Aug 25, 2021 at 4:03

Ismael♦

30.3k23 gold badges54 silver badges97 bronze badges

Thanks for your reply! But why is it good most of the time, only occasionally? Moreover, even if the gas price is increased, such problems occasionally occur.
– bencong he
Commented Aug 25, 2021 at 8:43
The users use metamask. Doesn't metamask execute in advance? Why do users still fail when they pay enough gas fees?
– bencong he
Commented Aug 25, 2021 at 8:47
For a similar contract ,I have never met this bug on matic, but there is a 10% probability on BSC
– bencong he
Commented Aug 25, 2021 at 8:48
@benconghe The gas calculation depends on the contract's state if it changes between the estimation and the transaction mined it might cause this type of errors. When doing my transactions I'll add an extra 10%. You could examine the contract's source and make it less dependent on state changes.
– Ismael ♦
Commented Aug 25, 2021 at 14:25

Add a comment |

1 Answer 1