message: constrain sinPhi in case the last update brought it to > 1, such that backpropagation can work, and the track is not lost
diff: @@ -240,6 +240,8 @@ GPUd() bool AliHLTTPCGMTrackParam::Fit(const AliHLTTPCGMPolynomialField* field,
  }
  else break; // bad chi2 for the whole track, stop the fit
  }
  + if (fP[2] > HLTCA_MAX_SIN_PHI) fP[2] = HLTCA_MAX_SIN_PHI;
  + else if (fP[2] < -HLTCA_MAX_SIN_PHI) fP[2] = -HLTCA_MAX_SIN_PHI;
  }
  bool ok = N >= TRACKLET_SELECTOR_MIN_HITS(fP[4]) && CheckNumericalQuality();
  