Segfault on MacOS 15.6.1

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

I was scrolling up and down in a big-ish (1127 RAWs) import right after import was done (trying to find a duplicate because the Lighttable UI showed "0 images selected of 112_8_").

Steps to reproduce

It has rarely happened to me: actually, the second time in the year of using Darktable.
Both times, it was scrolling up and down several times while previews were still being generated.

1. Start big-ish (1000+ RAWs) import as darktable ~/folder/with/raws
2. Wait till "importing…" progress bar disappear
3. Start scrolling down to the bottom
4. Wait till thumbnails to render there and start scrolling up
5. …
6. Sometimes darktable crashes.

Expected behavior

Continue working

Logfile | Screenshot | Screencast

Here is a CrashDump from the last segfault of mine.

darktable_2025.10.02.crashdump.gz

Commit

No response

Where did you obtain darktable from?

distro packaging

darktable version

2.5.1

What OS are you using?

Mac

What is the version of your OS?

15.6.1 (24G90)

Describe your system

Model Name: MacBook Pro
Model Identifier: Mac15,7
Model Number: Z1AK001DLB/A
Chip: Apple M3 Pro
Total Number of Cores: 12 (6 performance and 6 efficiency)
Memory: 36 GB
System Firmware Version: 11881.140.96
OS Loader Version: 11881.140.96

Built-in and external monitors are used

Are you using OpenCL GPU in darktable?

Yes

If yes, what is the GPU card and driver?

Apple M3 Pro

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

Reproducible only with RAWs afaik.

Start by examining the attached crashdump and reproducing the reported sequence: import 1,000+ RAWs, wait for importing to finish, then scroll while thumbnails render. Compare behavior on macOS 15.6.1 with OpenCL enabled; done means identifying and preventing the segfault without interrupting normal browsing.