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Bug 13111 – GC.realloc returns invalid memory for large reallocation

Status: RESOLVED
Resolution: FIXED
Severity: regression
Priority: P1
Component: druntime
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2014-07-12T17:10:00Z
Last change time: 2014-07-13T19:10:26Z
Keywords: pull
Assigned to: nobody
Creator: r.sagitario

Comments

Comment #0 by r.sagitario — 2014-07-12T17:10:30Z

Reported by Gary Willoughby, reduced by anonymous: import core.memory; void main() { alias T = ubyte; enum size1 = 2_049; /* > 2_048 = 2^^11 */ enum size2 = 1_048_577; /* > 1_048_576 = 2^^20 */ T* _data; _data = cast(T*)GC.calloc(size1, GC.BlkAttr.NO_MOVE); _data = cast(T*)GC.realloc(_data, size2, GC.BlkAttr.NO_MOVE); T* _pointer = _data; foreach(i; 0 .. size2) { *_pointer = 0; /* segfault at i = 1_048_576 */ _pointer++; } }

Comment #1 by r.sagitario — 2014-07-12T17:19:02Z

https://github.com/D-Programming-Language/druntime/pull/884

Comment #2 by safety0ff.bugz — 2014-07-12T17:39:39Z

2.065 Regression introduced by: https://github.com/D-Programming-Language/druntime/commit/4fe17c32bcfa9140e3b52e92b27474c3b60b3f95