#9452: freeGroup: block size is zero -------------------------------------+------------------------------------- Reporter: | Owner: simonmar scott.sadler | Status: new Type: bug | Milestone: Priority: normal | Version: 7.8.3 Component: Runtime | Keywords: System | Architecture: x86_64 (amd64) Resolution: | Difficulty: Unknown Operating System: MacOS X | Blocked By: Type of failure: Runtime | Related Tickets: crash | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by rwbarton): According to my reading of https://www.opengl.org/sdk/docs/man2/xhtml/glReadPixels.xml, `glReadPixels` with `format=GL_RGBA` and `type=GL_UNSIGNED_INT` will write one unsigned int per channel per pixel, so it will overwrite the array you allocated by a factor of 4. Looks like it is overwriting some GC information as `evacuate` and `freeGroup` are GC-related functions (not surprising that the GC would run during `peekArray`, as it has to allocate a large list). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9452#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler