NationalSecurityAgency/ghidra · error · ByteBlockAccessException

Could not set target memory

Error message

Could not set target memory

What it means

Thrown by DebuggerMemoryBytesProvider.doSet when an asynchronous write to target memory via controlService.createStateEditor(...).setVariable(...) fails. The ByteBlockAccessException wraps any InterruptedException, ExecutionException, or TimeoutException (1-second deadline) from the future.

Source

Thrown at Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/memory/DebuggerMemoryBytesProvider.java:366

			return controlService != null;
		}

		protected ByteBuffer alloc(int size) {
			return ByteBuffer.allocate(size)
					.order(isBigEndian()
							? ByteOrder.BIG_ENDIAN
							: ByteOrder.LITTLE_ENDIAN);
		}

		protected void doSet(Address address, ByteBuffer buffer) throws ByteBlockAccessException {
			checkEditsAllowed(address, buffer.capacity());
			try {
				controlService.createStateEditor(current)
						.setVariable(address, buffer.array())
						.get(1, TimeUnit.SECONDS);
			}
			catch (InterruptedException | ExecutionException | TimeoutException e) {
				throw new ByteBlockAccessException("Could not set target memory", e);
			}
		}

		@Override
		public void setByte(BigInteger index, byte value) throws ByteBlockAccessException {
			doSet(getAddress(index), alloc(Byte.BYTES).put(value));
		}

		@Override
		public void setShort(BigInteger index, short value) throws ByteBlockAccessException {
			doSet(getAddress(index), alloc(Short.BYTES).putShort(value));
		}

		@Override
		public void setInt(BigInteger index, int value) throws ByteBlockAccessException {
			doSet(getAddress(index), alloc(Integer.BYTES).putInt(value));
		}

View on GitHub (pinned to d5f144c24d)

Solutions

1. Confirm the target/emulator is alive and responsive, then retry the edit.
2. Verify the address being written is writable and mapped in the current coordinates.
3. If timeouts recur, check for a blocked target agent or a locked trace; restart the debug session.
4. Ensure no other transaction holds the trace open in a way that stalls the state editor.

Example fix

// before
controlService.createStateEditor(current)
    .setVariable(address, buffer.array())
    .get(1, TimeUnit.SECONDS); // may throw on timeout

// after - separate the failure modes
try {
    editor.setVariable(address, buffer.array()).get(1, TimeUnit.SECONDS);
} catch (TimeoutException te) {
    throw new ByteBlockAccessException("Timed out writing target memory; is the target alive?", te);
} catch (ExecutionException ee) {
    throw new ByteBlockAccessException("Target rejected memory write", ee.getCause());
}

boolean writable = controlService != null && current != null;
// also confirm address is mapped/writable via editor.isVariableWritable where available

try {
    provider.setByte(index, value);
} catch (ByteBlockAccessException e) {
    Throwable root = e.getCause();
    if (root instanceof TimeoutException) { /* target slow/dead */ }
    Msg.showError(this, null, "Write failed", e.getMessage(), root);
}

When it happens

Trigger: Editing a byte in the Memory Bytes provider while the control service's state editor future times out (>1s), is interrupted, or the underlying target/emu write raises an ExecutionException.

Common situations: Target connection lost or unresponsive; emulator stalled; heavy I/O making the 1-second timeout too tight; writing to read-only or unmapped target memory that the backend rejects; concurrent close of the trace during edit.

Related errors

• Cannot find process containing %s
• %s: %s
• Failed to read memory
• TODO: Unoptimized byte diff
• Byte arrays cannot exceed length of variable

AI-assisted analysis of NationalSecurityAgency/ghidra@d5f144c24d (2026-08-14). Data as JSON: /api/errors/2f0df32d7e4be07b. Report an issue: GitHub.