GPU TPC: Bugfix: Memory for TPC Track links was allocated too small

Author: davidrohr

GPU/GPUTracking/Merger/GPUTPCGMMerger.cxx

@@ -280,7 +280,7 @@ void* GPUTPCGMMerger::SetPointersMerger(void* mem)
   computePointerWithAlignment(mem, mTrackCCRoots, mNTotalSliceTracks);
   void* memMax = mem;
   mem = memBase;
-  computePointerWithAlignment(mem, mTrackIDs, mNMaxTracks); // UnpackResetIds - RefitSliceTracks - UnpackSliceGlobal
+  computePointerWithAlignment(mem, mTrackIDs, GPUCA_NSLICES * mNMaxSingleSliceTracks); // UnpackResetIds - RefitSliceTracks - UnpackSliceGlobal
   memMax = (void*)std::max((size_t)mem, (size_t)memMax);
   mem = memBase;
   computePointerWithAlignment(mem, mTrackSort, mNMaxTracks); // PrepareClustersForFit0 - SortTracksQPt - PrepareClustersForFit1 - PrepareClustersForFit1 / Finalize0 - Finalize2