Shut down subscription clients when DeviceController shuts down. #22323
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Sep 1, 2022
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And just to address #20085 (comment) : If we're shutting down the DeviceController for a fabric, nixing all the sessions for that fabric, etc, not calling Close on the subscription clients is a bit odd. It also leads to races: clients waiting on the server will get closed (because their session goes away), but clients not thus waiting would just stick around... |
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The Darwin CI failure here is real, though the problem pre-existing: we used to leak the ReadClient and the callback waiting on it. Now we're freeing the ReadClient, but not the callback (because we are using the ReadInteraction SubscribeAttribute API, which never calls OnDone on us, and hence we never know whether we can free the callback bits. LSAN used to not detect the leak because we leaked objects that referred to each other, and LSAN does not detect that. But now we free one of them, not the other, and the leak gets noticed. |
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Filed #22333 on the leak issue. Will just add a suppression for now, since it's not being made worse by this PR. |
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PR #22323: Size comparison from bd32efa to afeb46c Increases (42 builds for bl602, cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, nrfconnect, psoc6, qpg, telink)
Decreases (6 builds for cc13x2_26x2)
Full report (45 builds for bl602, cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, psoc6, qpg, telink)
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yunhanw-google
approved these changes
Sep 1, 2022
vivien-apple
approved these changes
Sep 1, 2022
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V1 accepted: fixes potential crash. |
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PR #22323: Size comparison from bd32efa to e39968d Increases (17 builds for bl602, cc13x2_26x2, k32w, linux, nrfconnect, qpg, telink)
Decreases (6 builds for cc13x2_26x2)
Full report (20 builds for bl602, cc13x2_26x2, k32w, linux, mbed, nrfconnect, qpg, telink)
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PR #22323: Size comparison from bd32efa to cb7ac0c Increases (42 builds for bl602, cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, nrfconnect, psoc6, qpg, telink)
Decreases (6 builds for cc13x2_26x2)
Full report (45 builds for bl602, cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, psoc6, qpg, telink)
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Other clients get shut down due to their sessions going away, but subscription clients can be in a state where they are not waiting on a response, and those should get shut down too. Also: 1) Fixes ReadClient::Close to release its exchange, so shutting down a subscription while it's waiting for a response from the server actually shuts it down, instead of delivering OnDone and then getting a message on the exchange and possibly sending more notifications after OnDone. 2) Fixes potential use-after-free in the ShutdownSubscriptions functions. Fixes project-chip#22319
…ning subscriptions.
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PR #22323: Size comparison from 0f0e1e9 to 10fb972 Increases (42 builds for bl602, cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, nrfconnect, psoc6, qpg, telink)
Decreases (7 builds for cc13x2_26x2, esp32)
Full report (45 builds for bl602, cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, psoc6, qpg, telink)
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bzbarsky-apple
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Sep 2, 2022
This leak got fixed in project-chip#22323
andy31415
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Sep 2, 2022
This leak got fixed in #22323
isiu-apple
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Sep 16, 2022
…ject-chip#22323) * Shut down subscription clients when DeviceController shuts down. Other clients get shut down due to their sessions going away, but subscription clients can be in a state where they are not waiting on a response, and those should get shut down too. Also: 1) Fixes ReadClient::Close to release its exchange, so shutting down a subscription while it's waiting for a response from the server actually shuts it down, instead of delivering OnDone and then getting a message on the exchange and possibly sending more notifications after OnDone. 2) Fixes potential use-after-free in the ShutdownSubscriptions functions. Fixes project-chip#22319 * Suppress now-visible LSan leak and have IM engine shut down any remaining subscriptions. * Fix lifetime management in subscribeAttributeWithEndpointId. * Address review comment: reduce duplication in read client iteration methods.
isiu-apple
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Sep 16, 2022
This leak got fixed in project-chip#22323
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Other clients get shut down due to their sessions going away, but subscription
clients can be in a state where they are not waiting on a response, and those
should get shut down too.
Also:
Fixes ReadClient::Close to release its exchange, so shutting down a
subscription while it's waiting for a response from the server actually shuts it
down, instead of delivering OnDone and then getting a message on the exchange
and possibly sending more notifications after OnDone.
Fixes potential use-after-free in the ShutdownSubscriptions functions.
Fixes #22319
Problem
Crashes possible due to subscription clients outliving shutdown.
Change overview
Make sure we call OnDone on all relevant subscriptions when shutting down a DeviceController.
Testing
Verified that if I create a subscription in chip-tool or darwin-framework-tool and then shut down the relevant controller I see
~ReadClientgetting called.