GZIP .NET Errors: Grounding and Power

.NET GZIP Errors Caused by Power Supply and Grounding Issues

A C# application reading GZIP archives was throwing an InvalidDataException with the message "The archive entry was compressed using an unsupported compression method." The error was highly intermittent: sometimes extraction succeeded, other times it crashed. The files themselves never changed, checksums matched perfectly, yet repeated read attempts would occasionally fail—even in Bash, throwing a "can’t seek file descriptor" error.

The stack trace pointed directly to DeflateStream.ReadCore in System.IO.Compression.dll (.NET Core 3.1.16). Inside ReadCore, the condition if (count <= this._buffer.Length) was evaluating to false: count was somehow exceeding the buffer size, triggering the InvalidDataException.

internal int ReadCore(Span<byte> buffer) {
  this.EnsureDecompressionMode();
  this.EnsureNotDisposed();
  this.EnsureBufferInitialized();
  int start = 0;
  while (true) {
    do {
      int num = this._inflater.Inflate(buffer.Slice(start));
      start += num;
      if (start == buffer.Length || this._inflater.Finished() && (!this._inflater.IsGzipStream() || !this._inflater.NeedsInput()))
        goto label_7;
    }
    while (!this._inflater.NeedsInput());
    int count = this._stream.Read(this._buffer, 0, this._buffer.Length);
    if (count > 0) {
      if (count <= this._buffer.Length) // here the condition evaluated to false
        this._inflater.SetInput(this._buffer, 0, count);
      else
        break;
    } else
      goto label_7;
  }
  throw new InvalidDataException(SR.GenericInvalidData);
  label_7:
  return start;
}

Deeper in the call stack, ZLibNative.Inflate was returning DataError or StreamError, which the runtime interpreted as corrupted data or an inconsistent stream.

Hardware Failure Symptoms

The issues quickly spilled beyond GZIP extraction. Visual Studio began crashing with obscure errors requiring repairs, icons would vanish, and text rendering became distorted. CrystalDiskInfo reported zero bad sectors, yet sfc /scannow repeatedly found and "fixed" corrupted system files.

The critical pattern emerged: failures only occurred when plugged into AC power. On battery, the system ran flawlessly. Additional symptoms included:

• Green and red visual artifacts across two different monitors.
• A noticeable electric tingle when touching the trackpad and chassis of a MacBook Pro 2012 (running Boot Camp).
• Apartment lights faintly glowing after being switched off.
• Sluggish application launches and random, unexplained shutdowns.

The Windows Event Log was logging APIC errors explicitly tied to power management.

Diagnosing the Electrical Root Cause

A simple outlet tester confirmed a complete lack of grounding in the wall sockets. The instability strongly correlated with high humidity, ambient heat, and the air conditioner running. Voltage sags (dropping below 120V) triggered the UPS with AVR to beep constantly, logging over 20 power events in just a few days.

Plugging the machine directly into a GFCI-protected outlet (in the bathroom) temporarily stabilized the system, even under heavy Prime95 load. Switching back to the standard power strip immediately brought the crashes back.

Likely culprits:

• Missing ground wire: Electrical current had nowhere to dissipate, causing static buildup on device chassis.
• Voltage sags from the AC unit: Heavy compressor cycles were dragging down line voltage.
• High humidity: Exacerbated electrical leakage across ungrounded circuits.

Resolution and Key Takeaways

Installing a properly grounded outlet (bonded to the water heater's grounding system) eliminated every single symptom. The outlet tester confirmed a solid ground connection. GZIP extraction stabilized completely, monitor artifacts vanished, and the electrical shocks stopped.

What to remember:

• Intermittent InvalidDataException errors in DeflateStream don't always mean corrupted files—they can point to hardware-level read failures.
• A count > buffer.Length condition in ReadCore is a classic symptom of input stream corruption at the hardware level.
• Missing grounding causes electrical potential to build up on metal chassis, directly interfering with storage drives and display outputs.
• Voltage sags combined with high humidity can cause silent data corruption without triggering bad sector warnings.
• Always rule out power and grounding issues before diving into deep code-level debugging.

Debugging I/O operations requires looking beyond the IDE and considering the entire physical chain—right down to the wall outlet.

— Editorial Team