getrawtransaction hangs node when calling large size tx

[hebasto]

Is there an existing issue for this?

• I have searched the existing issues

Current behaviour

Using Bitcoin Core (bitcoin-qt) 30.2 console, the command "getrawtransaction 30794005e228089a56cca58b6ad85e8cc0667cdc06b0ee6f9fe72aa19f50acd2" leaves the software unresponsive. This transaction is non-standard and included in block 938523. The transaction is 3.98 MB in size according to a 3rd party block explorer.

Expected behaviour

Expected raw transaction output in Console

Steps to reproduce

Run "getrawtransaction 30794005e228089a56cca58b6ad85e8cc0667cdc06b0ee6f9fe72aa19f50acd2"

(warning: expect your node to become unresponsive)

Relevant log output

No response

How did you obtain Bitcoin Core

Compiled from source

What version of Bitcoin Core are you using?

30.2

Operating system and version

Ubuntu 24.04.2 LTS

Machine specifications

Moved from bitcoin/bitcoin#34703.

[hebasto]

@FafoDevelopment

Could you clarify please if the GUI is truly frozen, or if it's just taking too long time to produce the output?

[hebasto]

It seems that QTextEdit::append is responsible for this performance issue.

[FafoDevelopment]

@FafoDevelopment

Could you clarify please if the GUI is truly frozen, or if it's just taking too long time to produce the output?

The first time I ran into this issue, I let it run overnight (7-8 hours) and still had no output. The GUI becomes unresponsive - cannot close the console window, cannot open the Settings drop down menu, etc.