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GatewayClient: the websocket handle was destroyed in place by loop() and connect() on the main task while other tasks (OTA progress, the websocket task's own pong) could still be inside a send on it. The atomic state check is a snapshot and the IDF client frees its locks on destroy without taking them, so a sender blocked for up to the 10 s send timeout touched freed memory. A SimpleMutex now guards the handle: senders hold it across the send, teardown takes the handle out under it and destroys outside it (the websocket task may be waiting for the same mutex, and destroy waits for that task), and the handle is published before start() so the first CONNECTED event's boot status finds it. The boot-status flag is atomic. VisualStateManager: the flag word is 32-bit (64-bit atomics are emulated with a critical section on every supported chip), and both it and the LED test flag use sequentially consistent ordering. updateVisualState() RMWs the flags then loads the test flag; RunLedTest() stores the test flag then loads the flags. Under relaxed ordering both can see stale values and a change made during the test is lost; it only worked before because the emulated 64-bit RMW happened to be a full barrier. OtaUpdateManager: the image state is written by Init() and the OTA task and read by other tasks; make it atomic. CaptivePortalInstance: the account-link rate limiter was an unlocked lazy init that was safe only because httpd is single-tasked. Use a block-scope static, which the toolchain's thread-safe statics make once-only on every target (ESP32-C3 has no inline fast path, acceptable for a per-request handler). CaptivePortal: double-checked locking for the instance. An advisory atomic flag, written under the instance mutex, lets GetInstance() skip the mutex while the portal is closed; the pointer under the mutex stays authoritative. A new AppHooks::CaptivePortalIsRunning() exposes it to core, and WiFiManager checks it before serializing local events, so a closed portal no longer costs a FlatBuffer per WiFi event.
The handle lock in sendMessageTXT/BIN waited forever, while the IDF send behind it gives up after 10 s. A sender queued behind another full-length send could therefore wait longer than the timeout it was promised. Wait for the lock with the same bound as the send and drop the message with a warning on timeout; one constant now covers both.
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title accurately summarizes the pull request's main changes: fixing race conditions and strengthening shared-state synchronization across the gateway, captive portal, LED state, and OTA state. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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I manually reviewed every file and it looks good to me, can you look over it @nullstalgia ? |
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Review comments at @components/core/src/GatewayClient.cpp:
- Line 28: Update the GatewayClient send path using GATEWAY_SEND_TIMEOUT to
measure one timeout across m_handleMutex acquisition and the WebSocket send;
after acquiring the mutex, calculate the remaining time and pass that remainder
to esp_websocket_client_send_*() rather than starting a fresh timeout.
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📒 Files selected for processing: 9
components/captive_portal/src/captiveportal/CaptivePortalInstance.cppcomponents/captive_portal/src/captiveportal/Manager.cppcomponents/core/include/AppHooks.hcomponents/core/src/AppHooks.cppcomponents/core/src/GatewayClient.cppcomponents/core/src/GatewayClient.hcomponents/core/src/wifi/WiFiManager.cppcomponents/device_control/src/visual/VisualStateManager.cppcomponents/ota/src/OtaUpdateManager.cpp
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Summary
An audit of shared state across tasks (double-checked locking candidates, atomic ordering, lazy init) found two race conditions and a few places where the guarantees were weaker than the code assumed. This PR fixes the races and tightens the rest.
Race 1: gateway websocket handle destroyed under a sender
GatewayClient::loop()(ping timeout) andconnect()destroyed the IDF websocket handle in place on the main task while other tasks could still be inside a send on it: the OTA task sends progress for every flashed chunk, and the websocket task sends its own pong and boot status. The atomic state check is a snapshot with no happens-before to the destroyer, andesp_websocket_client_destroy()deletes the client's semaphores and frees the struct without taking them. A sender blocked for up to the 10 s send timeout was left touching freed memory. The retire list protected the C++ object, not the handle inside it.SimpleMutexnow guards the handle. Senders hold it across the whole send.esp_websocket_client_start()so the first CONNECTED event's boot status finds it; senders are still rejected by the Connecting state until then.s_bootStatusSentis atomic: a retired client's websocket task can still be running when the new client's connects.A plain mutex was chosen over the repo's
ReadWriteMutexon purpose: the IDF client already serializes sends on its own locks, so concurrent "readers" gain nothing, and the reader-preferring RW lock would let a stream of OTA progress sends starve the destroyer.Race 2: visual state lost during the LED test
updateVisualState()RMWs the state flags then loads the LED-test flag;RunLedTest()stores the LED-test flag then loads the state flags. Under relaxed ordering both sides may see stale values, so a state change made during the LED test (an E-Stop indication, a connection change) is lost until the next unrelated event. It worked before only because the flags were a 64-bit atomic, and ESP-IDF emulates every 64-bit atomic with a critical section, which happens to be a full barrier.Shared-state guarantees
OtaUpdateManager. The image state is written by
Init()and by the OTA task on validation, and read by other tasks. Made itstd::atomic.Captive portal lazy init.
getAccountLinkRateLimiter()was an unlocked lazy init of a static pointer, safe only because httpd is single-tasked. It is now a block-scope static, which the toolchain's thread-safe statics make once-only on every target (verified:-fthreadsafe-staticsis on, IDF supplies__cxa_guard_*). Note for the ESP32-C3: GCC emits no inline fast path there, so each call takes the guard's global mutex. Fine for a per-request handler, which is why nothing hotter was converted.Captive portal double-checked locking.
GetInstance()now reads an advisory atomic flag, written under the instance mutex, and skips the mutex while the portal is closed. The pointer read under the mutex stays authoritative, so the flag is relaxed on purpose. A newAppHooks::CaptivePortalIsRunning()exposes it to core, andWiFiManagerchecks it before serializing local events, so a closed portal (the normal state) no longer builds and discards a FlatBuffer per WiFi event; 17 call sites go through three small helpers.Not changed
std::atomic<std::shared_ptr>, and the call rates do not justify it.Init()functions stay explicit; they are boot sequencing, not lazy init.Testing
nmconfirmsGatewayClient.cpp.objandVisualStateManager.cpp.objno longer reference emulated 64-bit atomics for anything but timestamps.Summary by CodeRabbit