panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0x89dd6c]

goroutine 90762 [running]:
panic(0x12296c0, 0x1f83c00)
	GOROOT/src/runtime/panic.go:1065 +0x565 fp=0xc00ac8fa78 sp=0xc00ac8f9b0 pc=0x437c65
runtime.panicmem()
	GOROOT/src/runtime/panic.go:212 +0x5b fp=0xc00ac8fa98 sp=0xc00ac8fa78 pc=0x435cbb
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:734 +0x173 fp=0xc00ac8fad0 sp=0xc00ac8fa98 pc=0x44fa93
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).releaseKeptDentriesLocked(0xc00bd0e240, 0x15aa460, 0xc00a913500)
	pkg/sentry/fsimpl/kernfs/filesystem.go:356 +0x4c fp=0xc00ac8fbb0 sp=0xc00ac8fad0 pc=0x89dd6c
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).Release(0xc000f87130, 0x15aa460, 0xc00a913500)
	pkg/sentry/fsimpl/kernfs/filesystem.go:339 +0xa7 fp=0xc00ac8fbe8 sp=0xc00ac8fbb0 pc=0x89dc67
gvisor.dev/gvisor/pkg/sentry/fsimpl/mqfs.(*filesystem).Release(0xc000f87130, 0x15aa460, 0xc00a913500)
	pkg/sentry/fsimpl/mqfs/mqfs.go:128 +0x7b fp=0xc00ac8fc10 sp=0xc00ac8fbe8 pc=0x8c6adb
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef.func1()
	pkg/sentry/vfs/filesystem.go:88 +0xe4 fp=0xc00ac8fc50 sp=0xc00ac8fc10 pc=0x7a1fe4
gvisor.dev/gvisor/pkg/sentry/vfs.(*FilesystemRefs).DecRef(0xc000f87130, 0xc00ac8fcd8)
	bazel-out/k8-fastbuild-ST-4c64f0b3d5c7/bin/pkg/sentry/vfs/filesystem_refs.go:152 +0x82 fp=0xc00ac8fcc8 sp=0xc00ac8fc50 pc=0x77e8e2
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef(0xc000f87130, 0x15aa460, 0xc00a913500)
	pkg/sentry/vfs/filesystem.go:83 +0x73 fp=0xc00ac8fd08 sp=0xc00ac8fcc8 pc=0x77de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy(0xc00bb730e0, 0x15aa460, 0xc00a913500)
	pkg/sentry/vfs/mount.go:637 +0x93 fp=0xc00ac8fd58 sp=0xc00ac8fd08 pc=0x785893
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).DecRef(0xc00bb730e0, 0x15aa460, 0xc00a913500)
	pkg/sentry/vfs/mount.go:616 +0xaa fp=0xc00ac8fd80 sp=0xc00ac8fd58 pc=0x7857ea
gvisor.dev/gvisor/pkg/sentry/fsimpl/mqfs.(*RegistryImpl).Destroy(0xc0072c6e70, 0x15aa460, 0xc00a913500)
	pkg/sentry/fsimpl/mqfs/registry.go:155 +0x72 fp=0xc00ac8fda8 sp=0xc00ac8fd80 pc=0x8c8532
gvisor.dev/gvisor/pkg/sentry/kernel/mq.(*Registry).Destroy(0xc0070739a0, 0x15aa460, 0xc00a913500)
	pkg/sentry/kernel/mq/mq.go:283 +0x97 fp=0xc00ac8fdf0 sp=0xc00ac8fda8 pc=0x8c2d17
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespace).DecRef.func1()
	pkg/sentry/kernel/ipc_namespace.go:120 +0x9e fp=0xc00ac8fe30 sp=0xc00ac8fdf0 pc=0xa862be
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespaceRefs).DecRef(0xc00b611830, 0xc00ac8feb8)
	bazel-out/k8-fastbuild-ST-4c64f0b3d5c7/bin/pkg/sentry/kernel/ipc_namespace_refs.go:152 +0x82 fp=0xc00ac8fea8 sp=0xc00ac8fe30 pc=0xa21ce2
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespace).DecRef(0xc00b611830, 0x15aa460, 0xc00a913500)
	pkg/sentry/kernel/ipc_namespace.go:115 +0x73 fp=0xc00ac8fee8 sp=0xc00ac8fea8 pc=0xa21533
gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0x0, 0xc00a913500, 0x157e4e0, 0x0)
	pkg/sentry/kernel/task_exit.go:292 +0x277 fp=0xc00ac8ff60 sp=0xc00ac8fee8 pc=0xa4d837
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00a913500, 0xd01)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc00ac8ffd0 sp=0xc00ac8ff60 pc=0xa58602
runtime.goexit()
	src/runtime/asm_amd64.s:1371 +0x1 fp=0xc00ac8ffd8 sp=0xc00ac8ffd0 pc=0x472861
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:380 +0x116