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Allow 'expired system timers' to be cancelled before execution. #22372

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Closed

Allow 'expired system timers' to be cancelled before execution. #22372

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andy31415
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Problem

SystemTimers cannot be reliably cancelled for socket impl.

Specifically to avoid starvation, system timers keeps a list of 'active timers' and that is not cancelable.

Change overview

  • Add unit test to verify that we can cancel in-progress timers
  • Fix timer cancellation (have a member list instead of stack variable for 'in process' list
  • Fix unit test for LoopbackTransport (self-cancelling timers on message send scheduling seemed to interfere with tests).

Fixes #22160
Fixes #19387

Testing

Unit tests. CI will also validate.

@andy31415
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1.0 Acceptance: high value fix (fixes test flakyness and potential use after free)

@andy31415 andy31415 changed the title System timer cancel fix Allow 'expired system timers' to be cancelled before execution. Sep 2, 2022
bzbarsky-apple
bzbarsky-apple requested changes Sep 2, 2022
View reviewed changes
src/transport/raw/tests/NetworkTestHelpers.h
class LoopbackTransport : public Transport::Base
{
private:
// Use unique pointers for work callbacks, so that one callback does not cancel another.
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This is a workaround for the real issue, which is that ScheduleWork on the select impl is broken. We should be fixing that, not working around it.

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Yes... did not try to yak shave into that one...

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github-actions bot commented Sep 2, 2022 •
edited
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PR #22372: Size comparison from 3522317 to f1fdaf4

Increases (21 builds for bl602, cc13x2_26x2, esp32, linux, nrfconnect, psoc6, telink)
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Closing as duplicate with #22375 and that one fixes more (fixes ScheduleWork too)

@andy31415 andy31415 closed this Sep 2, 2022
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@bzbarsky-apple bzbarsky-apple bzbarsky-apple requested changes

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@Byungjoo-Lee Byungjoo-Lee Awaiting requested review from Byungjoo-Lee

@carol-apple carol-apple Awaiting requested review from carol-apple

@chrisdecenzo chrisdecenzo Awaiting requested review from chrisdecenzo

@chshu chshu Awaiting requested review from chshu

@chulspro chulspro Awaiting requested review from chulspro

@Damian-Nordic Damian-Nordic Awaiting requested review from Damian-Nordic

@dhrishi dhrishi Awaiting requested review from dhrishi

@electrocucaracha electrocucaracha Awaiting requested review from electrocucaracha

@emargolis emargolis Awaiting requested review from emargolis

@erjiaqing erjiaqing Awaiting requested review from erjiaqing

@franck-apple franck-apple Awaiting requested review from franck-apple

@gjc13 gjc13 Awaiting requested review from gjc13

@harimau-qirex harimau-qirex Awaiting requested review from harimau-qirex

@harsha-rajendran harsha-rajendran Awaiting requested review from harsha-rajendran

@hawk248 hawk248 Awaiting requested review from hawk248

@isiu-apple isiu-apple Awaiting requested review from isiu-apple

@jelderton jelderton Awaiting requested review from jelderton

@jepenven-silabs jepenven-silabs Awaiting requested review from jepenven-silabs

@jmartinez-silabs jmartinez-silabs Awaiting requested review from jmartinez-silabs

@jtung-apple jtung-apple Awaiting requested review from jtung-apple

@kghost kghost Awaiting requested review from kghost

@kpschoedel kpschoedel Awaiting requested review from kpschoedel

@lazarkov lazarkov Awaiting requested review from lazarkov

@LuDuda LuDuda Awaiting requested review from LuDuda

@mrjerryjohns mrjerryjohns Awaiting requested review from mrjerryjohns

@msandstedt msandstedt Awaiting requested review from msandstedt

@mspang mspang Awaiting requested review from mspang

@saurabhst saurabhst Awaiting requested review from saurabhst

@selissia selissia Awaiting requested review from selissia

@tecimovic tecimovic Awaiting requested review from tecimovic

@tehampson tehampson Awaiting requested review from tehampson

@turon turon Awaiting requested review from turon

@vijs vijs Awaiting requested review from vijs

@vivien-apple vivien-apple Awaiting requested review from vivien-apple

@wbschiller wbschiller Awaiting requested review from wbschiller

@woody-apple woody-apple Awaiting requested review from woody-apple

@xylophone21 xylophone21 Awaiting requested review from xylophone21

@yufengwangca yufengwangca Awaiting requested review from yufengwangca

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@andy31415 @bzbarsky-apple