wasmerio/wasmer · error

Internal error: table base out of sync with linker state

Error message

Internal error: table base out of sync with linker state

What it means

After allocating table space for an already-instantiated module, this check compares the newly allocated table base with the module's recorded dylink table_base. If they differ, the linker's allocator and the module's dynamic-linking metadata have drifted, meaning function pointers (table indices) computed at compile time would point to the wrong slots. It aborts rather than silently corrupting indirect calls.

Source

Thrown at lib/wasix/src/state/linker/instance_group/table.rs:124

                was already instantiated in this group"
            )
        };

        let dl_module = linker_state
            .side_modules
            .get(&module_handle)
            .expect("Internal error: module not loaded into linker");

        let table_base = self
            .allocate_function_table(
                store,
                dl_module.dylink_info.mem_info.table_size,
                dl_module.dylink_info.mem_info.table_alignment,
            )
            .map_err(LinkError::TableAllocationError)?;

        if table_base != dl_module.table_base {
            panic!("Internal error: table base out of sync with linker state");
        }

        trace!(table_base, "Allocated table indices for existing module");

        Ok(())
    }

    pub(super) fn apply_resolved_function(
        &self,
        store: &mut impl AsStoreMut,
        name: &str,
        resolved_from: ModuleHandle,
        function_table_index: u32,
    ) -> Result<(), LinkError> {
        trace!(
            ?name,
            ?resolved_from,
            function_table_index,

View on GitHub (pinned to 8c4b9ee9d3)

Solutions

1. Recompile all shared modules with the same compiler/toolchain version so their table_base metadata is consistent
2. Load modules in a deterministic order and avoid manual function-table allocations between dynamic loads
3. Rebuild the instance group from scratch instead of reusing a table that has drifted
4. If reproducible with same-version modules, report as a linker bug with the module set and load order

Example fix

// before: mixing .so files built with different toolchains
load("liba-v1.so"); // table_base=1
load("libb-v2.so"); // table_base mismatch -> panic
// after: rebuild all shared libs with the same version
load("liba-v2.so");
load("libb-v2.so");

fn bases_match(allocated_base: u64, module: &DlModule) -> bool {
    allocated_base == module.dylink_info.table_base
}
// before allocating: verify toolchain versions match for all shared modules

fn same_toolchain(mods: &[&DlModule]) -> bool {
    mods.iter().all(|m| m.toolchain_version == mods[0].toolchain_version)
}

When it happens

Trigger: allocate_function_table_for_existing_module (via apply_dl_operation) when the running table allocator's next free index no longer matches dl_module.table_base, e.g. because other allocations were made in between or the module was compiled with different dylink metadata.

Common situations: Mixed-version shared objects: modules compiled by a different compiler/linker version with inconsistent table_base/table_size; interleaving manual table allocations with dynamic loads; loading modules into a group whose table was grown out-of-band.

Related errors

• Internal error: resolution record for symbol {name} indicate
• Internal error: function table index {index} already occupie
• Internal error: module {resolved_from:?} not loaded by this
• Internal error: allocated index {allocated_index} does not m
• Internal error: unexpected symbol resolution {r:?} for reque

AI-assisted analysis of wasmerio/wasmer@8c4b9ee9d3 (2026-09-01). Data as JSON: /api/errors/c97ace104c703d22. Report an issue: GitHub.