ci: libFuzzer disabled leak detection after every mutation #32681

1. 
   fanquake commented at 9:51 am on June 5, 2025: member

   https://cirrus-ci.com/task/4646509657980928?logs=ci#L91

   0[05:44:30.094] INFO: libFuzzer disabled leak detection after every mutation.
   1[05:44:30.094]       Most likely the target function accumulates allocated
   2[05:44:30.094]       memory in a global state w/o actually leaking it.
   3[05:44:30.094]       You may try running this binary with -trace_malloc=[12]      to get a trace of mallocs and frees.
   4[05:44:30.094]       If LeakSanitizer is enabled in this process it will still
   5[05:44:30.094]       run on the process shutdown.
   

   Happening in at least txgraph & transaction. Not sure I’ve seen this before.

2. fanquake added the label Tests on Jun 5, 2025
3. 
   maflcko commented at 9:56 am on June 5, 2025: member

   See https://github.com/bitcoin/bitcoin/pull/31481
4. 
   MkDev11 commented at 0:40 am on February 16, 2026: none

   Hey @fanquake, I’d like to fix this by passing -detect_leaks=0 to the fuzz binary in test/fuzz/test_runner.py (same idea as #31481), so leak detection only runs at process exit. I’d add it in the run_once and generate_corpus code paths (and optionally merge_inputs). Is this approach okay before I open a PR?
5. 
   maflcko commented at 12:40 pm on February 17, 2026: member

   Can this be closed?
6. 
   fanquake commented at 12:41 pm on February 17, 2026: member

   Yea I think so.
7. fanquake closed this on Feb 17, 2026

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8. fanquake added the label Fuzzing on Feb 17, 2026

Contributors
fanquake maflcko MkDev11

Labels
Tests Fuzzing