Werk #19881: Piggyback Hub: Fix crash when piggybacked host folders are removed

Component

Checks & agents

Title

Piggyback Hub: Fix crash when piggybacked host folders are removed

Date

Apr 30, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.5.0p1	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p28	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

The piggyback hub could crash shortly after a piggybacked host folder under tmp/check_mk/piggyback/ was removed, for example during piggyback cleanups. This issue was introduced by werk #19417, which fixed a different cause of crashes in the piggyback hub on busy sites.

The hub now handles this situation correctly and no longer crashes.

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