Follow-up Comment #2, bug #16031 (project gnustep): No, it is also accessing it. Note that cWin is a macro for generic.cachedWindow. It then accesses cWin->number. After preprocessing this is generic.cachedWindow->number. Invalid pointer dereference... As for chasing the bug further, not sure. I'm not familiar with the way -back is organized nor very familiar with Xlib. But the problem seems to be that the structure is freed before any calls to NSMapRemove() (it seems to me like XGServerWindow-termwindow: does this.)
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