getrawtransaction hangs node when calling large size tx #932

1. 
   hebasto commented at 11:53 am on March 2, 2026: member

   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 https://github.com/bitcoin/bitcoin/issues/34703.

2. 
   hebasto commented at 3:33 pm on March 17, 2026: member

   @FafoDevelopment

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

3. 
   hebasto commented at 4:37 pm on March 17, 2026: member

   It seems that QTextEdit::append is responsible for this performance issue.
4. 
   FafoDevelopment commented at 5:46 pm on March 17, 2026: none

   @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.

5. ?
   user_blocked bitcoin-core
6. bitcoin-core deleted a comment on Mar 30, 2026

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hebasto FafoDevelopment