Fix bug causing no response flush sometimes when IO threads are busy#3205
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Signed-off-by: Jacob Murphy <jkmurphy@google.com>
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On another note, I'm not sure if this "second read" gives much better performance. But this path is very unlikely to be triggered in our tests and feels like a time bomb given the low path coverage. Maybe we should consider removing it. But let's fix it first |
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I think we need to backport down to 8.0. Although I had trouble reproducing since without the pipeline optimization it doesn't seem as likely to trigger. https://github.com/valkey-io/valkey/blob/8.0/src/server.c#L1719-L1722 |
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It looks like a clever trick.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## unstable #3205 +/- ##
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This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [docker.io/valkey/valkey](https://github.com/valkey-io/valkey) | image | patch | `9.0.1` → `9.0.4` | --- ### Release Notes <details> <summary>valkey-io/valkey (docker.io/valkey/valkey)</summary> ### [`v9.0.4`](https://github.com/valkey-io/valkey/releases/tag/9.0.4) [Compare Source](valkey-io/valkey@9.0.3...9.0.4) Upgrade urgency SECURITY: This release includes security fixes we recommend you apply as soon as possible. ##### Security fixes - (CVE-2026-23479) Use-After-Free in unblock client flow - (CVE-2026-25243) Invalid Memory Access in RESTORE command - (CVE-2026-23631) Use-after-free when full sync occurs during a yielding Lua/function execution ### [`v9.0.3`](https://github.com/valkey-io/valkey/releases/tag/9.0.3) [Compare Source](valkey-io/valkey@9.0.2...9.0.3) ##### Valkey 9.0.3 Upgrade urgency SECURITY: This release includes security fixes we recommend you apply as soon as possible. ##### Security fixes - (CVE-2025-67733) RESP Protocol Injection via Lua error\_reply - (CVE-2026-21863) Remote DoS with malformed Valkey Cluster bus message - (CVE-2026-27623) Reset request type after handling empty requests ##### Bug fixes - Avoids crash during MODULE UNLOAD when ACL rules reference a module command and subcommand ([#​3160](valkey-io/valkey#3160)) - Fix server assert on ACL LOAD when current user loses permission to channels ([#​3182](valkey-io/valkey#3182)) - Fix bug causing no response flush sometimes when IO threads are busy ([#​3205](valkey-io/valkey#3205)) ### [`v9.0.2`](https://github.com/valkey-io/valkey/releases/tag/9.0.2) [Compare Source](valkey-io/valkey@9.0.1...9.0.2) Upgrade urgency HIGH: There are critical bugs that may affect a subset of users. #### Bug fixes - Avoid memory leak of new argv when HEXPIRE commands target only non-exiting fields ([#​2973](valkey-io/valkey#2973)) - Fix HINCRBY and HINCRBYFLOAT to update volatile key tracking ([#​2974](valkey-io/valkey#2974)) - Avoid empty hash object when HSETEX added no fields ([#​2998](valkey-io/valkey#2998)) - Fix case-sensitive check for the FNX and FXX arguments in HSETEX ([#​3000](valkey-io/valkey#3000)) - Prevent assertion in active expiration job after a hash with volatile fields is overwritten ([#​3003](valkey-io/valkey#3003), [#​3007](valkey-io/valkey#3007)) - Fix HRANDFIELD to return null response when no field could be found ([#​3022](valkey-io/valkey#3022)) - Fix HEXPIRE to not delete items when validation rules fail and expiration is in the past ([#​3023](valkey-io/valkey#3023), [#​3048](valkey-io/valkey#3048)) - Fix how hash is handling overriding of expired fields overwrite ([#​3060](valkey-io/valkey#3060)) - HSETEX - Always issue keyspace notifications after validation ([#​3001](valkey-io/valkey#3001)) - Make zero a valid TTL for hash fields during import mode and data loading ([#​3006](valkey-io/valkey#3006)) - Trigger prepareCommand on argc change in module command filters ([#​2945](valkey-io/valkey#2945)) - Restrict TTL from being negative and avoid crash in import-mode ([#​2944](valkey-io/valkey#2944)) - Fix chained replica crash when doing dual channel replication ([#​2983](valkey-io/valkey#2983)) - Skip slot cache optimization for AOF client to prevent key duplication and data corruption ([#​3004](valkey-io/valkey#3004)) - Fix used\_memory\_dataset underflow due to miscalculated used\_memory\_overhead ([#​3005](valkey-io/valkey#3005)) - Avoid duplicate calculations of network-bytes-out in slot stats with copy-avoidance ([#​3046](valkey-io/valkey#3046)) - Fix XREAD returning error on empty stream with + ID ([#​2742](valkey-io/valkey#2742)) #### Performance/Efficiency Improvements - Track reply bytes in I/O threads if commandlog-reply-larger-than is -1 ([#​3086](valkey-io/valkey#3086), [#​3126](valkey-io/valkey#3126)). This makes it possible to mitigate a performance regression in 9.0.1 caused by the bug fix [#​2652](valkey-io/valkey#2652). **Full Changelog**: <valkey-io/valkey@9.0.1...9.0.2> </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - "before 6am" - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xNjkuNCIsInVwZGF0ZWRJblZlciI6IjQzLjE2OS40IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJyZW5vdmF0ZSJdfQ==-->
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When we attempt to process commands from IO thread reads a second time, we never call handleClientsWithPendingWrites after that point. This sometimes causes the following sequence resulting in no response flush:
Adding a second call to handleClientsWithPendingWrites should fix it. This call should be cheap since it fast returns when there are no pending writes.
Fixes #3198