I see stange crash in gdeque unit if I use unit from FPC trunk https://github.com/graemeg/freepascal/blob/master/packages/fcl-stl/src/gdeque.pp

crash in TDeque.PushFront, i cannot understand it and i don't know the code. pls, reproduce it like me:

- Linux gtk2 x64 (Ubuntu 18.4), fpc 3.0.4, lazarus 2.1 trunk
- get CudaText source and compile it
http://wiki.freepascal.org/CudaText#How_to_compile_program
- unit atsynedit_adapter_cache.pas uses "gdeque"
- now I got FPC trunk file and copied it to atsynedit_deque.pas. Changed 'uses' to use renamed unit.
- run CudaText in IDE, in CudaText open IDE's main.pp (huge file), go to file end, hold the UP arrow to scroll up
- after 1-2 screens are scrolled, i see crash

What causes crash - maybe last diff?
https://github.com/graemeg/freepascal/commit/dc5d2d526db9991af9c6cbada85ce1ab2424c9b4#diff-d1eb1c2b51ef448804f4d14e46ba7eed i tried to change new Increase* method with simple code like FCapacity*=2; and it don't help.

For those who wants to replicated gdeque crash. I avoided using of gdeque unit now, so to replicate, pls get an older version of atsynedit_adapter_cache.pas: before 2019.01.30

https://github.com/Alexey-T/ATSynEdit/commits/master/atsynedit/atsynedit_adapter_cache.pas

Op 2019-01-27 om 19:40 schreef AlexeyT:

To complicated, please simplify it to a small example. Debugging massive frameworks on a single hunch is not doable for the bugtriagers.

Do you use the trunk gdeque in 3.0.4, or whole trunk?