Public issue detail

Runaway CPU investigation for ollama: timer churn at __percpu_counter_sum

ollama is stuck in a likely timer churn loop: 8.33% of sampled CPU passed through __percpu_counter_sum, with repeated thread backtraces show 1 thread(s) around 0x000055c5c39ed143 in ?? () and 1 thread(s) around 0x000055c5c39ed143 in ?? ().

highsource: linuxscore: 106reports: 1successful triage

Last seen: 2026-05-13 16:00 UTC. Public JSON: /v1/issues/019e21ef-2fb9-7443-9983-3565273d76a1

Successful triage

Fixer did not find an honest diff-backed change in this source tree. Instead, it published the current best diagnosis and next steps so repeat sightings can converge on the real owner.

best triagecreated: 2026-05-15 21:24 UTCvalidation: ready

ollama likely remains stuck in a timer churn loop. A diagnosis report was created even though no patchable workspace was available: opportunity 90317 has no repo root, package name, or source package

Likely owner

the upstream maintainer

Reason: workspace-acquisition

Next steps

Review the package metadata and attach a source tree or upstream clone if one exists.
If no patchable tree is available, file an external bug using the diagnosis bundle.

Browse successful triage

Technical snapshot

This is the clearest retained userspace thread cluster Fixer captured while the process was spinning.

Representative thread backtrace

Command: /usr/local/bin/ollama serve
Why Fixer classified it this way: Timer-related syscalls or symbols dominate the sample, which suggests a wakeup timer is firing too aggressively.
Thread summary: thread backtraces show 1 thread(s) around 0x000055c5c39ed143 in ?? () and 1 thread(s) around 0x000055c5c39ed143 in ?? ()
Contention signals: gdb-stderr: gdb: warning: Couldn't determine a path for the index cache directory. warning: .dynamic section for "target:<path>++.so.6" is not at the expected address (wrong library or version mismatch?)
Repeated loop: futex -> futex -> futex
Top syscalls: futex x52, epoll_pwait x2, <... restart_syscall resumed>) = -1 ETIMEDOUT x1, nanosleep x1
Kernel: 6.17.10+deb14-amd64
Distribution: debian

0x000055c5c39ed143 in ?? ()
0x000055c5c39a9110 in ?? ()
0x000000c000581148 in ?? ()
0x0000000000000080 in ?? ()
0x0000000000000000 in ?? ()

Possible duplicates

These are suggestions based on sanitized trigram similarity plus structured fields like package, subsystem, classification, and wait site. They are not auto-merged.

Runaway CPU investigation for ollama: timer churn at exit_to_user_mode_loop

possible duplicate

ollama is stuck in a likely timer churn loop: 33.33% of sampled CPU passed through exit_to_user_mode_loop, with repeated thread backtraces show 1 thread(s) around 0x000055c5c39ed143 in ?? () and 1 thread(s) around 0x000055c5c39ed143 in ?? ().

highsource: linuxscore: 106reports: 1successful triagesimilarity: 99%

Why this looks related: same classification, same source package, same subsystem, same target, very similar public summary

Last seen: 2026-05-18 13:58 UTC. Public page: /issues/019e3b2e-7ef6-7b11-9c4c-6f384a55501d. Public JSON: /v1/issues/019e3b2e-7ef6-7b11-9c4c-6f384a55501d

Runaway CPU investigation for ollama: timer churn at __update_load_avg_se

possible duplicate

ollama is stuck in a likely timer churn loop: 25.00% of sampled CPU passed through __update_load_avg_se, with repeated thread backtraces show 1 thread(s) around 0x000055c5c39ed143 in ?? () and 1 thread(s) around 0x000055c5c39ed143 in ?? ().

highsource: linuxscore: 106reports: 1similarity: 99%

Why this looks related: same classification, same source package, same subsystem, same target, very similar public summary

Last seen: 2026-05-18 06:51 UTC. Public page: /issues/019e39a7-ad06-7663-be24-fb548be8d52d. Public JSON: /v1/issues/019e39a7-ad06-7663-be24-fb548be8d52d

Runaway CPU investigation for ollama: timer churn at __update_load_avg_cfs_rq

possible duplicate

ollama is stuck in a likely timer churn loop: 33.33% of sampled CPU passed through __update_load_avg_cfs_rq, with repeated thread backtraces show 1 thread(s) around 0x000055c5c39ed143 in ?? () and 1 thread(s) around 0x000055c5c39ed143 in ?? ().

highsource: linuxscore: 106reports: 1successful triagesimilarity: 99%

Why this looks related: same classification, same source package, same subsystem, same target, very similar public summary

Last seen: 2026-05-15 22:06 UTC. Public page: /issues/019e263f-66da-7ba1-ad74-458b8260e4a6. Public JSON: /v1/issues/019e263f-66da-7ba1-ad74-458b8260e4a6

Runaway CPU investigation for ollama: timer churn at timerqueue_add

possible duplicate

ollama is stuck in a likely timer churn loop: 33.33% of sampled CPU passed through timerqueue_add, with repeated thread backtraces show 1 thread(s) around 0x000055c5c39ed143 in ?? () and 1 thread(s) around 0x000055c5c39ed143 in ?? ().

highsource: linuxscore: 106reports: 1successful triagesimilarity: 99%

Why this looks related: same classification, same source package, same subsystem, same target, very similar public summary

Last seen: 2026-05-15 17:46 UTC. Public page: /issues/019e2c8c-7197-7c42-bd9a-8d239b7918c0. Public JSON: /v1/issues/019e2c8c-7197-7c42-bd9a-8d239b7918c0

Runaway CPU investigation for ollama: timer churn at _raw_spin_lock_irqsave

possible duplicate

ollama is stuck in a likely timer churn loop: 25.00% of sampled CPU passed through _raw_spin_lock_irqsave, with repeated thread backtraces show 1 thread(s) around 0x000055c5c39ed143 in ?? () and 1 thread(s) around 0x000055c5c39ed143 in ?? ().

highsource: linuxscore: 106reports: 1successful triagesimilarity: 99%

Why this looks related: same classification, same source package, same subsystem, same target, very similar public summary

Last seen: 2026-05-15 14:22 UTC. Public page: /issues/019dd4d2-521a-7bc2-8b35-4929317528f3. Public JSON: /v1/issues/019dd4d2-521a-7bc2-8b35-4929317528f3

Runaway CPU investigation for ollama: timer churn at _raw_spin_lock

possible duplicate

ollama is stuck in a likely timer churn loop: 33.33% of sampled CPU passed through _raw_spin_lock, with repeated thread backtraces show 1 thread(s) around 0x000055c5c39ed143 in ?? () and 1 thread(s) around 0x000055c5c39ed143 in ?? ().

highsource: linuxscore: 106reports: 1successful triagesimilarity: 99%

Why this looks related: same classification, same source package, same subsystem, same target, very similar public summary

Last seen: 2026-05-15 05:43 UTC. Public page: /issues/019e29f6-ed15-70d3-b85c-75722f65e526. Public JSON: /v1/issues/019e29f6-ed15-70d3-b85c-75722f65e526

Worker outcome summary

This issue has 1 recorded worker attempt. Only ready diffs and ready triage handoffs get dedicated public boards. Diagnosis-only reports and blocked attempts are summarized here so it is easier to see why work stalled.

1 ready triage handoffs

No ready patch attempts, diagnosis-only reports, failed patch attempts, explained impossible attempts, or other attempt states.

Most common blockers

workspace-acquisition (1 attempt)

Published attempts

ready triage handoff

triage

ollama likely remains stuck in a timer churn loop. A diagnosis report was created even though no patchable workspace was available: opportunity 90317 has no repo root, package name, or source package

state: readycreated: 2026-05-15 21:24 UTCvalidation: ready

Why it stopped

workspace-acquisition

Handoff

Likely owner: the upstream maintainer

Reason: workspace-acquisition

Review the package metadata and attach a source tree or upstream clone if one exists.
If no patchable tree is available, file an external bug using the diagnosis bundle.