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TRBDF2 + NonlinearSolveAlg(Simple*) fails on singular diagonal mass matrix ROBER since #4560

Status: Open.

#4617 In SciML/OrdinaryDiffEq.jl;

· ChrisRackauckas-Claude opened on Sep 24, 2026

DiffEqBase: FlexUnits, ReverseDiff, Tracker, Measurements, MonteCarloMeasurements ODE_DEFAULT_NORM compute sqrt(mean(|x|)), not RMS

Status: Open.

#4610 In SciML/OrdinaryDiffEq.jl;

· ChrisRackauckas-Claude opened on Sep 23, 2026

FBDF/QNDF: constant predictor on the first step makes the BDF1 error estimate O(h); solve aborts at t0 when t0 ≫ 0 (dt < eps(t0))

Status: Open.

#4606 In SciML/OrdinaryDiffEq.jl;

· ChrisRackauckas-Claude opened on Sep 23, 2026

Float32: initdt falls back to dt=1e-6 via absolute eps guard, +27% steps on Lorenz

Status: Open.

#4601 In SciML/OrdinaryDiffEq.jl;

· ChrisRackauckas-Claude opened on Sep 23, 2026

Rosenbrock DAE error estimate uses inv(abstol), which is wrong for vector abstol

Status: Open.

#4598 In SciML/OrdinaryDiffEq.jl;

· ChrisRackauckas-Claude opened on Sep 23, 2026

NonlinearSolveAlg: NoInitCache and Homotopy inner algorithms can terminate before the integrator's κ/η test

Status: Open.

#4597 In SciML/OrdinaryDiffEq.jl;

· ChrisRackauckas-Claude opened on Sep 23, 2026

DiffEqBase: Unitful ODE_DEFAULT_NORM computes sqrt(mean(|x|)), not RMS

Status: Open.

#4596 In SciML/OrdinaryDiffEq.jl;

· ChrisRackauckas-Claude opened on Sep 23, 2026

DiffEqBase: ODE_DEFAULT_NORM uses @fastmath, which lets isnan/isfinite checks be compiled away

Status: Open.

#4595 In SciML/OrdinaryDiffEq.jl;

· ChrisRackauckas-Claude opened on Sep 23, 2026

DelayDiffEq: callback save_positions decides the correctness of the history, not just the saved output

Status: Open.

#4515 In SciML/OrdinaryDiffEq.jl;

· devmotion opened on Sep 11, 2026

PDIRK QA fails on Julia 1.10: stale threading imports and documented SciMLBase reexports rejected

Status: Open.

#4463 In SciML/OrdinaryDiffEq.jl;

· ChrisRackauckas-Claude opened on Sep 5, 2026

Wrapping PETSc TS behind the common interface

Status: Open.

#4451 In SciML/OrdinaryDiffEq.jl;

· singhharsh1708 opened on Aug 31, 2026

StochasticDiffEq: JumpProblem callback stored in kwargs fires twice

Status: Open.

#4439 In SciML/OrdinaryDiffEq.jl;

· ChrisRackauckas-Claude opened on Aug 30, 2026