Issue 1:
W0613 14:15:54.827171 9637 reflector.go:334] k8s.io/kubernetes/plugin/pkg/scheduler/factory/factory.go:393: watch of *api.Node ended with: too old resource version: 724 (731)
--- FAIL: TestUnschedulableNodes (0.15s)
panic: interface conversion: interface {} is nil, not *api.Node [recovered]
panic: interface conversion: interface {} is nil, not *api.Node

goroutine 12895 [running]:
panic(0x239e4c0, 0xc827e8c680)
/usr/local/go/src/runtime/panic.go:464 +0x3e6
testing.tRunner.func1(0xc8285e46c0)
/usr/local/go/src/testing/testing.go:467 +0x192
panic(0x239e4c0, 0xc827e8c680)
/usr/local/go/src/runtime/panic.go:426 +0x4e9
k8s.io/kubernetes/test/integration.waitForReflection.func1(0x1d66b20, 0x0, 0x0)
/home/decarr/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/integration/scheduler_test.go:112 +0x222
k8s.io/kubernetes/pkg/util/wait.WaitFor(0xc826e77dc0, 0xc828bd33b8, 0xc827faef00, 0x0, 0x0)
/home/decarr/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/pkg/util/wait/wait.go:210 +0x77
k8s.io/kubernetes/pkg/util/wait.pollInternal(0xc826e77dc0, 0xc828bd33b8, 0x0, 0x0)
/home/decarr/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/pkg/util/wait/wait.go:170 +0x8a
k8s.io/kubernetes/pkg/util/wait.Poll(0x5f5e100, 0x6fc23ac00, 0xc828bd33b8, 0x0, 0x0)
/home/decarr/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/pkg/util/wait/wait.go:164 +0x4f
k8s.io/kubernetes/test/integration.waitForReflection(0xc8285e46c0, 0x7f24991d6498, 0xc827043840, 0x297dee0, 0x19, 0x2d27730, 0x0, 0x0)
/home/decarr/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/integration/scheduler_test.go:108 +0xd7
k8s.io/kubernetes/test/integration.DoTestUnschedulableNodes.func1(0xc8285e46c0, 0xc827225900, 0x7f24991d6498, 0xc827043840, 0xc8286f7740)
/home/decarr/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/integration/scheduler_test.go:178 +0x249
k8s.io/kubernetes/test/integration.DoTestUnschedulableNodes(0xc8285e46c0, 0xc8286f7740, 0x7f24991d6498, 0xc827043840)
/home/decarr/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/integration/scheduler_test.go:242 +0xaf9
k8s.io/kubernetes/test/integration.TestUnschedulableNodes(0xc8285e46c0)
/home/decarr/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/integration/scheduler_test.go:84 +0x73e
testing.tRunner(0xc8285e46c0, 0x3a6baa8)
/usr/local/go/src/testing/testing.go:473 +0x98
created by testing.RunTests
/usr/local/go/src/testing/testing.go:582 +0x892
FAIL k8s.io/kubernetes/test/integration 218.503s

seen on #26806

Issue 2:
panic: interface conversion: interface {} is nil, not *api.Node [recovered]
panic: interface conversion: interface {} is nil, not *api.Node

goroutine 42845 [running]:
panic(0x24413e0, 0xc8383133c0)
/usr/local/go/src/runtime/panic.go:481 +0x3e6
testing.tRunner.func1(0xc83bebbc20)
/usr/local/go/src/testing/testing.go:467 +0x192
panic(0x24413e0, 0xc8383133c0)
/usr/local/go/src/runtime/panic.go:443 +0x4e9
k8s.io/kubernetes/test/integration.waitForReflection.func1(0x1deefa0, 0x0, 0x0)
/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/integration/scheduler_test.go:112 +0x222
k8s.io/kubernetes/pkg/util/wait.WaitFor(0xc837aa12a0, 0xc838313300, 0xc838175320, 0x0, 0x0)
/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/pkg/util/wait/wait.go:210 +0x77
k8s.io/kubernetes/pkg/util/wait.pollInternal(0xc837aa12a0, 0xc838313300, 0x0, 0x0)
/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/pkg/util/wait/wait.go:170 +0x8a
k8s.io/kubernetes/pkg/util/wait.Poll(0x5f5e100, 0x6fc23ac00, 0xc838313300, 0x0, 0x0)
/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/pkg/util/wait/wait.go:164 +0x4f
k8s.io/kubernetes/test/integration.waitForReflection(0xc83bebbc20, 0x7f210f5a71e8, 0xc837c740a0, 0x2a3dce0, 0x19, 0x2e00598, 0x0, 0x0)
/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/integration/scheduler_test.go:108 +0x172
k8s.io/kubernetes/test/integration.DoTestUnschedulableNodes.func1(0xc83bebbc20, 0xc831b12500, 0x7f210f5a71e8, 0xc837c740a0, 0xc838c9ae80)
/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/integration/scheduler_test.go:178 +0x249
k8s.io/kubernetes/test/integration.DoTestUnschedulableNodes(0xc83bebbc20, 0xc838c9ae80, 0x7f210f5a71e8, 0xc837c740a0)
/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/integration/scheduler_test.go:242 +0xaf9
k8s.io/kubernetes/test/integration.TestUnschedulableNodes(0xc83bebbc20)
/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/integration/scheduler_test.go:84 +0x73e
testing.tRunner(0xc83bebbc20, 0x3b6ee50)
/usr/local/go/src/testing/testing.go:473 +0x98
created by testing.RunTests
/usr/local/go/src/testing/testing.go:582 +0x892

@davidopp @mml