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csi: avoid a nil pointer when handling plugin events (#15518)
If a plugin crashes quickly enough, we can get into a situation where the deregister function is called before it's ever registered. Safely handle the resulting nil pointer in the dynamic registry by not emitting a plugin event, but also update the plugin event handler to tolerate nil pointers in case we wire it up elsewhere in the future.
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Original file line number | Diff line number | Diff line change |
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```release-note:bug | ||
csi: Fixed a bug where a crashing plugin could panic the Nomad client | ||
``` |
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