manager: fix race condition in Stop() using sync.Once#3803
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dims merged 1 commit intogoogle:masterfrom Dec 19, 2025
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manager: fix race condition in Stop() using sync.Once#3803dims merged 1 commit intogoogle:masterfrom
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The switch from RWMutex to sync.Map in commit 20e39fc introduced a race condition in destroyContainer(). When multiple goroutines attempt to destroy the same container simultaneously, they can all call Stop() on the same containerData, causing a "close of closed channel" panic. The panic manifests as: panic: close of closed channel goroutine N [running]: github.com/google/cadvisor/manager.(*containerData).Stop(...) manager/container.go:143 +0x46 Fix this by using sync.Once to ensure the stop channel is only closed once, making Stop() safe to call multiple times. Signed-off-by: Davanum Srinivas <davanum@gmail.com>
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The switch from RWMutex to sync.Map in commit 20e39fc introduced a race condition in destroyContainer(). When multiple goroutines attempt to destroy the same container simultaneously, they can all call Stop() on the same containerData, causing a "close of closed channel" panic.
The panic manifests as:
panic: close of closed channel
goroutine N [running]:
github.com/google/cadvisor/manager.(*containerData).Stop(...)
manager/container.go:143 +0x46
Fix this by using sync.Once to ensure the stop channel is only closed once, making Stop() safe to call multiple times.