CPU hotspot in ollama: unresolved offset in ollama

Prompt

## Plan Pass

You are planning a fixer patch before any edits happen.

Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `local-executable-upstream-git`. The original pre-edit snapshot is available at `./source` if you need to inspect it.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. For public upstream review, prepare the final patch against the upstream default integration branch, usually `master` or `main`; use installed or stable source trees for reproduction/backport validation, not as the default merge-request base unless the contribution docs explicitly say to target a stable branch. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, branch-base choice, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `github.com_ollama_ollama` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.

Return a short markdown plan with these exact sections:

## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation

Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, timing/throttling behavior, or PostgreSQL database-core behavior such as dynamic library resolution, extension loading, transaction semantics, locking, planner/executor behavior, catalog changes, or storage changes, treat it as high-risk: do not plan a source patch unless validation can reproduce the behavior and analyze the semantic impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.

## Patch Pass

You are working on a bounded fixer proposal.

Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `local-executable-upstream-git`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. For public upstream review, prepare the final patch against the upstream default integration branch, usually `master` or `main`; use installed or stable source trees for reproduction/backport validation, not as the default merge-request base unless the contribution docs explicitly say to target a stable branch. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, branch-base choice, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `github.com_ollama_ollama` upstream patch, not just a Debian-local workaround. 

Keep the change narrowly scoped and summarize validation clearly.

In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:

## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.

## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis. PostgreSQL database-core source changes touching dynamic library resolution, extension loading, transaction semantics, locking, planner/executor behavior, catalog changes, or storage changes require reproduced evidence plus explicit semantic-impact analysis. Otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.

## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.

## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.

## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.

Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.

## Review Pass 1

You are reviewing a freshly generated fixer patch.

Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `local-executable-upstream-git`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. For public upstream review, prepare the final patch against the upstream default integration branch, usually `master` or `main`; use installed or stable source trees for reproduction/backport validation, not as the default merge-request base unless the contribution docs explicitly say to target a stable branch. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, branch-base choice, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `github.com_ollama_ollama` upstream patch, not just a Debian-local workaround.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.

Do not apply code changes in this pass.

Return a short markdown review report. The first non-empty line must be exactly one of:

RESULT: ok
RESULT: fix-needed

If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.

Response

## Plan Pass

## Problem

Fixer observed a 3-second `perf` profile where 11.75% of sampled CPU in `/usr/local/bin/ollama` landed in unresolved instruction offsets around `0x18a4870-0x18a4890`. The installed binary is stripped, `go tool addr2line` could not resolve those offsets, and the evidence bundle does not identify a Go package, C/C++ function, workload, model, request shape, or user-visible regression.

## Evidence Confidence

observed

## Proposed Subject

No source patch yet: diagnose unresolved perf hotspot before editing.

## Patch Plan

Do not prepare a source change from the current evidence alone. The maintainer-facing report should state that Fixer observed a hot instruction range in a stripped local executable, not a confirmed source-level bug.

Before any future patch, collect enough source attribution to make it reviewable: rerun or reprocess profiling with symbols/debug info, map the hot offsets to the ggml/Ollama source function, identify the model/workload that produced the profile, and compare against upstream `main`. The workspace branch is `master` with a synthetic `Fixer baseline`, while the retained upstream source is on `main`; any eventual upstream patch should target upstream `main`.

I found no prior Fixer patch to improve or replace. Since no touched subsystem can be named from the evidence, no subsystem-local helper applies yet. General conventions found: `CONTRIBUTING.md` asks for `<package>: <short description>` commit titles and behavior-focused tests; `docs/development.md` names `go test ./...` for tests, while the detected native build entrypoint is CMake/Ninja. Local wrappers/helpers observed include `logutil.NewLogger`/`logutil.Trace` for logging and the `fs` package for GGUF/config parsing, but none is relevant until the hotspot is attributed.

## Risks

A source patch would be speculative: the disassembly suggests a tight native numeric loop over 16-bit values and float lookup/multiply/add, likely in vendored/native inference code, but the symbol shown by `objdump` is not reliable source attribution for a stripped PIE binary. Optimizing or changing that path without workload reproduction risks harming model correctness, backend portability, or CPU/GPU performance.

## Validation

First try the project-level command from the workspace root:

```sh
cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure
```

If that fails because optional native dependencies or generated files are unavailable, record the exact failure and then run the narrowest reproducible checks for the diagnosed subsystem, likely `go test ./...` plus targeted native compile/tests once the symbol is known.

Bounded independent evidence step before editing: run `perf report --stdio -i /var/lib/fixer/perf/2026-05-27T13-59-53.855162230+00-00-ollama.data --no-children` and symbolization attempts such as `go tool addr2line /usr/local/bin/ollama` and `objdump -d --start-address=0x18a4850 --stop-address=0x18a48b0 /usr/local/bin/ollama`. This can confirm the unresolved-offset signal, but it cannot independently reproduce the CPU hotspot without the original workload/model.

## Patch Pass

Subject: perf-hotspot: report unresolved ollama offset

## Commit Message
No source change was made. The evidence is a profiler-only hotspot in a stripped installed `ollama` binary, and the hot offset could not be mapped to a source function. A patch would be speculative until the workload and symbolized source location are known.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a 3-second `perf` sample showing 11.75% of CPU in `/usr/local/bin/ollama` at an unresolved offset. Reprocessing the profile confirmed hot instruction offsets around `0x18a4870-0x18a4890`, but `go tool addr2line` returned `?:0` and the binary is stripped.

The cautious inference is that the hot code is a native numeric loop, but the code-level cause is not attributable to a reviewable Ollama or ggml source function from this evidence. Following the saved plan, I did not leave a source diff. The expected effect is to avoid an upstream patch that changes inference behavior or performance without a reproducible workload and symbolized source location.

I checked `CONTRIBUTING.md` and `docs/development.md`: upstream commit subjects should use `<package>: <short description>`, tests should prefer behavior coverage, and `go test ./...` is the documented Go test entrypoint. The retained upstream repository is on `main`; this workspace is a synthetic `master` baseline, so any eventual patch should target upstream `main`. No relevant local helper API was found because no source subsystem could be safely identified.

## Git Add Paths
None

## Validation
Project-level command attempted:

```sh
cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure
```

It failed during CMake configure: `Could NOT find Vulkan (missing: glslc) (found version "1.4.341")`.

Fallback checks attempted:

```sh
go test ./...
```

This first failed because `/root/.cache/go-build` is read-only. With writable caches:

```sh
GOCACHE=/tmp/ollama-gocache GOMODCACHE=/tmp/ollama-gomodcache go test ./...
```

The full suite still failed because dependencies could not be fetched under restricted networking, for example `Get "https://proxy.golang.org/...": dial udp 127.0.0.53:53: socket: operation not permitted`. Some cached packages did run; `cmd/internal/fileutil` tests also failed in this environment.

Collected-signal checks:

```sh
perf report --stdio -i /var/lib/fixer/perf/2026-05-27T13-59-53.855162230+00-00-ollama.data --no-children --sort comm,dso,symbol
printf '0x18a4890\n0x18a488c\n0x18a487d\n0x18a4870\n0x1832298\n' | go tool addr2line /usr/local/bin/ollama
objdump -d --start-address=0x18a4850 --stop-address=0x18a48b0 /usr/local/bin/ollama
```

These confirmed the unresolved-offset profile and failed source symbolization.

Bounded independent reproduction attempted:

```sh
perf record -o /tmp/ollama-help.data -- /usr/local/bin/ollama --help
```

That produced `zero-sized data`, so it did not reproduce the hotspot. The reproduction blocker is that the evidence bundle does not include the original model/workload/request that drove the sampled CPU.

## Review Pass 1

RESULT: ok

No source diff is present in the workspace, which matches the author’s no-patch diagnosis.

The response correctly classifies the evidence as `inferred` for profiler-only unresolved-offset data, avoids inventing a reproducer or user-visible failure, and does not leave a speculative source patch. It also documents the contribution/test conventions, upstream `main` branch base, lack of relevant local helper because no subsystem was attributable, and the evidence limit.

Validation is acceptable for a no-patch report: the project-level CMake/Ninja/CTest entrypoint was attempted with the exact Vulkan `glslc` blocker, fallback `go test ./...` attempts and environment blockers were reported, and a bounded independent perf smoke attempt was included without claiming reproduction.