SIGSEGV: invalid memory reference in test_read_thumbnail

[jayvdb]

Recent commits on main have been failing in the test coverage job

     Running tests/test_read_thumbnail.rs (target/llvm-cov-target/debug/deps/test_read_thumbnail-7758b85d1eff1541)

running 8 tests
error: test failed, to rerun pass `--test test_read_thumbnail`

Caused by:
  process didn't exit successfully: `/home/runner/work/philips-isyntax-rs/philips-isyntax-rs/target/llvm-cov-target/debug/deps/test_read_thumbnail-7758b85d1eff1541` (signal: 11, SIGSEGV: invalid memory reference)

https://github.com/AzHicham/philips-isyntax-rs/actions/runs/10998002870/job/30534915887

[jayvdb]

I havent looked into this, however we have experienced similar problems. It was quite a while ago, so details are vague, but (roughly) it was that the metadata needs to have been finished reading before any other operation could be performed on the same file.
I can dig out the details if it helps.

[AzHicham]

Hello @jayvdb
Thanks for your help, I have this issue since the first day I don't know how to fix it tbh.
If you have any clues I'd be happy :)

[AzHicham]

may be we just need to run tests with only a single thread

[AzHicham]

After merging this PR
it looks like we do not have any SIGSEGV anymore