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feat: responses might be executed before canister_on_low_wasm_memory #271

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feat: responses might be executed before canister_on_low_wasm_memory #271

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feat: responses might be executed before canister_on_low_wasm_memory
mraszyk May 22, 2026
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Potential fix for pull request finding
mraszyk May 22, 2026
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3 changes: 2 additions & 1 deletion docs/references/ic-interface-spec/abstract-behavior.md
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Expand Up @@ -1245,14 +1245,15 @@ Conditions
S.messages = Older_messages · FuncMessage M · Younger_messages
(M.queue = Unordered) or (∀ CallMessage M' | FuncMessage M' ∈ Older_messages. M'.queue ≠ M.queue)
(∀ FuncMessage M' ∈ Older_messages · Younger_messages. M'.receiver ≠ M.receiver or M.entry_point ≠ OnLowWasmMemory)
S.on_low_wasm_memory_hook_status[M.receiver] ≠ Ready
S.canisters[M.receiver] ≠ EmptyCanister
Mod = S.canisters[M.receiver].module
Ctxt = S.call_contexts[M.call_context]
Deadline = deadline_of_context(Ctxt)

Is_response = M.entry_point == Callback _ _ _
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S.on_low_wasm_memory_hook_status[M.receiver] ≠ Ready or Is_response

Env = {
time = S.time[M.receiver];
controllers = S.controllers[M.receiver];
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4 changes: 3 additions & 1 deletion docs/references/ic-interface-spec/canister-interface.md
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Expand Up @@ -179,7 +179,9 @@ The threshold `t` can be defined in the field `wasm_memory_threshold` in the [ca
:::note

While the above function is scheduled immediately once the condition above is triggered, it may not necessarily be executed immediately if the canister does not have enough cycles.
If the canister gets frozen immediately after the function is scheduled for execution, the function will run once the canister's unfrozen _if_ the canister's remaining wasm memory size in bytes remains strictly less than the threshold `t`.
If the canister gets frozen immediately after the function is scheduled for execution, the function will run once the canister is unfrozen _if_ the canister's remaining wasm memory size in bytes remains strictly less than the threshold `t`.
In particular, inter-canister response callback messages might still be executed after the condition is triggered and before the function `canister_on_low_wasm_memory` is executed.

:::

#### Callbacks
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