Memory leak with ICU 72.1.0.2 (Windows 11 24H2)

[mterrisse]

Hello,

We have a memory leak with ICU 72.1.0.2 on Windows 11 24H2. This doesn't happen with ICU 68.2.0.10 on Windows 11 23H2.

Here are the steps in a gui program with a File / Save As command:

• LoadLibrary('icuuc.dll')
• Get the addresses of u_init, u_cleanup, and u_setMemoryFunctions
• LoadLibrary ('icuin.dll'). This loads icu.dll too.
• Get the addresses of ucol_open, ucol_close, ucol_strcoll, and ucol_setAttribute
• Call u_setMemoryFunctions to set memory allocation functions
• Call u_init. The memory allocation functions are called
• Open a Save As dialog (GetSaveFileName, comdlg32.dll) and cancel
• Call u_cleanup (). This doesn't release memory allocated by u_init
• Call FreeLibray for icuin.dll. icu.dll is not unloaded and memory is not released
• Note that at this step if you haven't called GetSaveFileName, icu.dll is unloaded and the memory is released
• Call FreeLibrary for icuuc.dll. No change.

Regards,

Michel Terrisse

[mterrisse]

Hello,

The bug is still present after Windows 11 2025-01 cumulative update.
Do you need more information to reproduce the problem?

Regards,

Michel Terrisse

[mterrisse]

Hello,

The bug is still present after Windows 11 2025-04 cumulative update.
ICU version is now 72.1.0.4

Regards,

Michel Terrisse