pkg/manager: add a sanity check for base kernel crashes

It might be possible that:
1) The reproducer did not crash the base kernel.
2) Yet the base kernel has crashed with the same title independently
   since the moment we have started to find the reproducer etc.

It should not be normally happening (it means that the current mechanism
of checking whether the bug affects the base kernel is flawed), but it
still happens.

Add an extra check to avoid reporting such false positives and call
log.Errorf() to ensure that the situation will be recorded in the logs.

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