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Reset a CycleBuffer segment's start trim when it is recycled (#3302) - #3303
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Absorbed from PR #3251's branch (0ce150b), where its read/parse stress test found it. Segment.Recycle returns the segment to a process-wide spare slot, from which Segment.Create hands it to any buffer as pristine - but it kept StartTrimCount, and some paths recycle without Untrim first (Release, and AppendOrRecycle's search-exhausted path). The next buffer's 'new' segment then carried a trim that never happened: Debug.Assert(leasedStart == 0) in Debug, and in Release a later Untrim expanding backwards by it, corrupting the chain's running indexes. ARecycledTrimmedSegmentStartsCleanInTheNextBuffer: trim, Release, then a new buffer's first segment - StartTrimCount 4 on the old code, 0 now.
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This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [StackExchange.Redis](https://seredis.dev/) ([source](https://github.com/StackExchange/StackExchange.Redis)) | nuget | patch | `3.4.20` → `3.4.29` | --- ### Release Notes <details> <summary>StackExchange/StackExchange.Redis (StackExchange.Redis)</summary> ### [`v3.4.29`](https://github.com/StackExchange/StackExchange.Redis/releases/tag/3.4.29) [Compare Source](seredis/StackExchange.Redis@3.4.20...3.4.29) #### What's Changed - (stabilty) Reset a CycleBuffer segment's start trim when it is recycled ([#​3302](seredis/StackExchange.Redis#3302)) by [@​mgravell](https://github.com/mgravell) in [#​3303](seredis/StackExchange.Redis#3303) - Restore: make the dedicated subscription connection lazy by [@​mgravell](https://github.com/mgravell) in [#​3310](seredis/StackExchange.Redis#3310) - Update RedisType.Bitmap and the keyspace-event tokens to reflect current server values by [@​mgravell](https://github.com/mgravell) in [#​3312](seredis/StackExchange.Redis#3312) - Fix ConnectionGroupMember string-ctor dropping the name by [@​mgravell](https://github.com/mgravell) in [#​3314](seredis/StackExchange.Redis#3314) - Parse unbracketed IPv6 ip:port from the server ([#​1422](seredis/StackExchange.Redis#1422)) by [@​mgravell](https://github.com/mgravell) in [#​3307](seredis/StackExchange.Redis#3307) - Profile commands sent in a batch ([#​2175](seredis/StackExchange.Redis#2175)) by [@​mohsinaliwork686-rgb](https://github.com/mohsinaliwork686-rgb) in [#​3313](seredis/StackExchange.Redis#3313) #### Tooling - gitignore: .claude is per-user state except .claude/skills by [@​mgravell](https://github.com/mgravell) in [#​3306](seredis/StackExchange.Redis#3306) - Command coverage ledger and audit skill by [@​mgravell](https://github.com/mgravell) in [#​3311](seredis/StackExchange.Redis#3311) - Update public API docs by [@​mgravell](https://github.com/mgravell) in [#​3429](https://github.com/StackExchange/StackExchange.Redis/pull/3429) #### New Contributors - [@​mohsinaliwork686-rgb](https://github.com/mohsinaliwork686-rgb) made their first contribution in [#​3313](seredis/StackExchange.Redis#3313) **Full Changelog**: <seredis/StackExchange.Redis@3.4.20...3.4.29> </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - 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 CLI](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0NC4xOTguMiIsInVwZGF0ZWRJblZlciI6IjQ0LjE5OC4yIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119--> Reviewed-on: https://git.milkshake.services/FloatingMilkshake/Azusa/pulls/13 Reviewed-by: Milkshake <me@floatingmilkshake.com>
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This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [StackExchange.Redis](https://seredis.dev/) ([source](https://github.com/StackExchange/StackExchange.Redis)) | nuget | patch | `3.4.20` → `3.4.29` | --- ### Release Notes <details> <summary>StackExchange/StackExchange.Redis (StackExchange.Redis)</summary> ### [`v3.4.29`](https://github.com/StackExchange/StackExchange.Redis/releases/tag/3.4.29) [Compare Source](seredis/StackExchange.Redis@3.4.20...3.4.29) #### What's Changed - (stabilty) Reset a CycleBuffer segment's start trim when it is recycled ([#​3302](seredis/StackExchange.Redis#3302)) by [@​mgravell](https://github.com/mgravell) in [#​3303](seredis/StackExchange.Redis#3303) - Restore: make the dedicated subscription connection lazy by [@​mgravell](https://github.com/mgravell) in [#​3310](seredis/StackExchange.Redis#3310) - Update RedisType.Bitmap and the keyspace-event tokens to reflect current server values by [@​mgravell](https://github.com/mgravell) in [#​3312](seredis/StackExchange.Redis#3312) - Fix ConnectionGroupMember string-ctor dropping the name by [@​mgravell](https://github.com/mgravell) in [#​3314](seredis/StackExchange.Redis#3314) - Parse unbracketed IPv6 ip:port from the server ([#​1422](seredis/StackExchange.Redis#1422)) by [@​mgravell](https://github.com/mgravell) in [#​3307](seredis/StackExchange.Redis#3307) - Profile commands sent in a batch ([#​2175](seredis/StackExchange.Redis#2175)) by [@​mohsinaliwork686-rgb](https://github.com/mohsinaliwork686-rgb) in [#​3313](seredis/StackExchange.Redis#3313) #### Tooling - gitignore: .claude is per-user state except .claude/skills by [@​mgravell](https://github.com/mgravell) in [#​3306](seredis/StackExchange.Redis#3306) - Command coverage ledger and audit skill by [@​mgravell](https://github.com/mgravell) in [#​3311](seredis/StackExchange.Redis#3311) - Update public API docs by [@​mgravell](https://github.com/mgravell) in [#​3429](https://github.com/StackExchange/StackExchange.Redis/pull/3429) #### New Contributors - [@​mohsinaliwork686-rgb](https://github.com/mohsinaliwork686-rgb) made their first contribution in [#​3313](seredis/StackExchange.Redis#3313) **Full Changelog**: <seredis/StackExchange.Redis@3.4.20...3.4.29> </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - 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 CLI](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0NC4xOTguMiIsInVwZGF0ZWRJblZlciI6IjQ0LjE5OC4yIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119--> Reviewed-on: https://git.milkshake.services/FloatingMilkshake/MechanicalMilkshake/pulls/13 Reviewed-by: Milkshake <me@floatingmilkshake.com>
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Fixes #3302.
CycleBuffer.Segment.Recycle()returns segments to a process-wide_spareslot without resettingStartTrimCount, andCreate/Initdon't reset it either, so the next buffer to take that segment (any connection, any multiplexer) inherits a trim that never happened. Segments reach the slot still trimmed viaRelease()and viaAppendOrRecycle's search-exhausted path (afterResetAndGetNext, which restoresMemorybut not the trim) - the latter in steady state for multi-segment buffers, not just on teardown.The stale value bites in
Commit->CopyDueToDiscardDuringWrite: when the buffer is fully drained while a write lease is open (the outbound copy-out loop discarding while the writer holdsGetMemory),Untrimzeroes the trim and the copy reads fromleasedStart, which still includes the stale offset - so the wrong bytes go out.StartTrimCountinRecycle, plus its test.DiscardDuringWriteKeepsLeasedBytesAfterARecycledTrimmedSegment, which checks the bytes rather than the field: without the fix the second buffer commits789(the previous buffer's payload) instead ofXYZ.RESPite.Tests pass on net10.0 (1719/1719).