bevyengine/bevy · critical

Aborting due to allocator error

Error message

Aborting due to allocator error

What it means

bevy_ecs guards raw allocator operations with an AbortOnPanic drop guard: if any panic occurs while allocator state may be inconsistent, the guard's Drop panics again with this message, deliberately converting the unwind into an abort to avoid undefined behavior. The message is therefore always a consequence of an earlier panic inside allocation-heavy storage code, not the root cause.

Source

Thrown at crates/bevy_ecs/src/storage/mod.rs:73

    pub fn prepare_component(&mut self, component: &ComponentInfo) {
        match component.storage_type() {
            StorageType::Table => {
                // table needs no preparation
            }
            StorageType::SparseSet => {
                self.sparse_sets.get_or_insert(component);
            }
        }
    }
}

/// Guards against allocator panics. Needs to be `mem::forget`en on success.
struct AbortOnPanic;

impl Drop for AbortOnPanic {
    fn drop(&mut self) {
        // Panicking while unwinding will force an abort.
        panic!("Aborting due to allocator error");
    }
}

/// Unsafe extension functions for `Vec<T>`
trait VecExtensions<T> {
    /// Removes an element from the vector and returns it.
    ///
    /// The removed element is replaced by the last element of the vector.
    ///
    /// This does not preserve ordering of the remaining elements, but is O(1). If you need to preserve the element order, use [`remove`] instead.
    ///
    ///
    /// # Safety
    ///
    /// All of the following must be true:
    /// - `self.len() > 1`
    /// - `index < self.len() - 1`
    ///

View on GitHub (pinned to 396ca72708)

Solutions

1. Look at the first panic above this message (stderr/log order) - it names the real failure; this abort is only the fallout.
2. If it is memory pressure: reduce memory use (fewer entities, smaller payloads, despawn aggressively), look for leaks in long-lived resources, or increase available memory.
3. If it reproduces with modest memory usage, minimize the case and report it - a non-OOM trigger here is a storage-layer bug.

// Pre-check bulk spawn scale instead of letting the allocator abort
let bytes = count
    .checked_mul(core::mem::size_of::<T>())
    .expect("count overflow");
assert!(bytes <= isize::MAX as usize, "allocation too large");

When it happens

Trigger: An underlying panic inside Vec/blob/table growth paths while the guard is live - e.g. the allocation error handler firing on allocation failure, or a bug during a resize - causing a panic during unwinding and thus an abort.

Common situations: Memory exhaustion while spawning very large numbers of entities/components; corrupted allocator state caused by unsafe code elsewhere in the process; runaway growth from unbounded spawns or leaks.

Related errors

• array layout should be valid
• Union types are not supported yet.
• Expected a Template type path
• Can only derive VariantDefaults for enums
• Cannot call `ReflectComponent::reflect_mut` on component {na

AI-assisted analysis of bevyengine/bevy@396ca72708 (2026-08-20). Data as JSON: /api/errors/6f423b8641ccf06c. Report an issue: GitHub.