Public issue detail

Runaway CPU investigation for sshd-auth: unknown userspace loop at fdget_pos

sshd-auth is stuck in a likely unclassified userspace loop: 50.00% of sampled CPU passed through fdget_pos, with repeated no dominant syscall sample was captured.

highpackage: openssh-serversource: opensshscore: 106reports: 1

Last seen: 2026-06-27 21:56 UTC. Public JSON: /v1/issues/019f0a5d-c564-7ca1-bf39-b796c2e8376d

Technical snapshot

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

Representative thread backtrace

  • Why Fixer classified it this way: The process is demonstrably CPU-hot, but the current syscall and symbol sample does not point to a single dominant loop family yet.
  • Hot path: fdget_pos (50.00% sampled CPU)
  • Package: openssh-server 1:10.3p1-1
  • Kernel: 6.17.10+deb14-amd64
  • Distribution: debian

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.

sshd-auth is stuck in a likely unclassified userspace loop: 50.00% of sampled CPU passed through schedule_timeout, with repeated restart_syscall x1.

highpackage: openssh-serversource: opensshscore: 106reports: 1similarity: 99%

Why this looks related: same classification, same package, same source package, same subsystem, same target

Last seen: 2026-07-02 22:27 UTC. Public page: /issues/019f0e0a-9b12-7bc3-ba1f-6777e4555f8d. Public JSON: /v1/issues/019f0e0a-9b12-7bc3-ba1f-6777e4555f8d

sshd-auth is stuck in a likely unclassified userspace loop: 59.36% of sampled CPU passed through __free_one_page, with repeated restart_syscall x1.

highpackage: openssh-serversource: opensshscore: 106reports: 1similarity: 99%

Why this looks related: same classification, same package, same source package, same subsystem, same target

Last seen: 2026-06-27 18:17 UTC. Public page: /issues/019f056b-3317-7523-ae06-871756bd6b92. Public JSON: /v1/issues/019f056b-3317-7523-ae06-871756bd6b92

sshd-session is stuck in a likely unclassified userspace loop: 100.00% of sampled CPU passed through sock_poll, with repeated thread backtraces show 1 thread(s) around 0x00007f35fa09a7d2 in ?? () from target:<path>.

highpackage: openssh-serversource: opensshscore: 106reports: 2patch attempt readysimilarity: 90%

Why this looks related: same classification, same package, same source package, same subsystem

Last seen: 2026-06-27 17:58 UTC. Public page: /issues/019dff15-4a95-7fb3-b680-40595c35ee68. Public JSON: /v1/issues/019dff15-4a95-7fb3-b680-40595c35ee68

sshd-session is stuck in a likely unclassified userspace loop: 12.29% of sampled CPU passed through getuid@plt, with repeated thread backtraces show 1 thread(s) around 0x00007f4a7a09a7d2 in ?? () from target:<path>.

highpackage: openssh-serversource: opensshscore: 106reports: 1similarity: 88%

Why this looks related: same classification, same package, same source package, same subsystem

Last seen: 2026-07-01 21:48 UTC. Public page: /issues/019f0b26-eab5-72b2-b263-744003837417. Public JSON: /v1/issues/019f0b26-eab5-72b2-b263-744003837417

sshd-session is stuck in a likely unclassified userspace loop: 28.29% of sampled CPU passed through uncharge_folio, with repeated thread backtraces show 1 thread(s) around 0x00007f57f0c9a7d2 in ?? () from target:<path>.

highpackage: openssh-serversource: opensshscore: 106reports: 1similarity: 86%

Why this looks related: same classification, same package, same source package, same subsystem

Last seen: 2026-07-02 22:27 UTC. Public page: /issues/019f20e6-c120-7931-9e82-74a4401b64d9. Public JSON: /v1/issues/019f20e6-c120-7931-9e82-74a4401b64d9

sshd-session is stuck in a likely unclassified userspace loop: 24.67% of sampled CPU passed through __mod_node_page_state, with repeated thread backtraces show 1 thread(s) around 0x00007f57f0c9a7d2 in ?? () from target:<path>.

highpackage: openssh-serversource: opensshscore: 106reports: 1similarity: 84%

Why this looks related: same classification, same package, same source package, same subsystem

Last seen: 2026-07-08 12:09 UTC. Public page: /issues/019f2502-84ff-79d0-bc6a-164181704a53. Public JSON: /v1/issues/019f2502-84ff-79d0-bc6a-164181704a53

Published attempts

No public attempts have been published for this issue yet.