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

goroutine 610 [running]:
panic(0x12296c0, 0x1f83c00)
	GOROOT/src/runtime/panic.go:1065 +0x565 fp=0xc0008b1a78 sp=0xc0008b19b0 pc=0x437c65
runtime.panicmem()
	GOROOT/src/runtime/panic.go:212 +0x5b fp=0xc0008b1a98 sp=0xc0008b1a78 pc=0x435cbb
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:734 +0x173 fp=0xc0008b1ad0 sp=0xc0008b1a98 pc=0x44fa93
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).releaseKeptDentriesLocked(0xc0008a4000, 0x15aa460, 0xc0006cd500)
	pkg/sentry/fsimpl/kernfs/filesystem.go:356 +0x4c fp=0xc0008b1bb0 sp=0xc0008b1ad0 pc=0x89dd6c
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).Release(0xc0004ca0b0, 0x15aa460, 0xc0006cd500)
	pkg/sentry/fsimpl/kernfs/filesystem.go:339 +0xa7 fp=0xc0008b1be8 sp=0xc0008b1bb0 pc=0x89dc67
gvisor.dev/gvisor/pkg/sentry/fsimpl/mqfs.(*filesystem).Release(0xc0004ca0b0, 0x15aa460, 0xc0006cd500)
	pkg/sentry/fsimpl/mqfs/mqfs.go:128 +0x7b fp=0xc0008b1c10 sp=0xc0008b1be8 pc=0x8c6adb
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef.func1()
	pkg/sentry/vfs/filesystem.go:88 +0xe4 fp=0xc0008b1c50 sp=0xc0008b1c10 pc=0x7a1fe4
gvisor.dev/gvisor/pkg/sentry/vfs.(*FilesystemRefs).DecRef(0xc0004ca0b0, 0xc0008b1cd8)
	bazel-out/k8-fastbuild-ST-4c64f0b3d5c7/bin/pkg/sentry/vfs/filesystem_refs.go:152 +0x82 fp=0xc0008b1cc8 sp=0xc0008b1c50 pc=0x77e8e2
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef(0xc0004ca0b0, 0x15aa460, 0xc0006cd500)
	pkg/sentry/vfs/filesystem.go:83 +0x73 fp=0xc0008b1d08 sp=0xc0008b1cc8 pc=0x77de13
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy(0xc00035d800, 0x15aa460, 0xc0006cd500)
	pkg/sentry/vfs/mount.go:637 +0x93 fp=0xc0008b1d58 sp=0xc0008b1d08 pc=0x785893
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).DecRef(0xc00035d800, 0x15aa460, 0xc0006cd500)
	pkg/sentry/vfs/mount.go:616 +0xaa fp=0xc0008b1d80 sp=0xc0008b1d58 pc=0x7857ea
gvisor.dev/gvisor/pkg/sentry/fsimpl/mqfs.(*RegistryImpl).Destroy(0xc0008964f8, 0x15aa460, 0xc0006cd500)
	pkg/sentry/fsimpl/mqfs/registry.go:155 +0x72 fp=0xc0008b1da8 sp=0xc0008b1d80 pc=0x8c8532
gvisor.dev/gvisor/pkg/sentry/kernel/mq.(*Registry).Destroy(0xc0005a41c0, 0x15aa460, 0xc0006cd500)
	pkg/sentry/kernel/mq/mq.go:283 +0x97 fp=0xc0008b1df0 sp=0xc0008b1da8 pc=0x8c2d17
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespace).DecRef.func1()
	pkg/sentry/kernel/ipc_namespace.go:120 +0x9e fp=0xc0008b1e30 sp=0xc0008b1df0 pc=0xa862be
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespaceRefs).DecRef(0xc00059a750, 0xc0008b1eb8)
	bazel-out/k8-fastbuild-ST-4c64f0b3d5c7/bin/pkg/sentry/kernel/ipc_namespace_refs.go:152 +0x82 fp=0xc0008b1ea8 sp=0xc0008b1e30 pc=0xa21ce2
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespace).DecRef(0xc00059a750, 0x15aa460, 0xc0006cd500)
	pkg/sentry/kernel/ipc_namespace.go:115 +0x73 fp=0xc0008b1ee8 sp=0xc0008b1ea8 pc=0xa21533
gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0x0, 0xc0006cd500, 0x157e4e0, 0x0)
	pkg/sentry/kernel/task_exit.go:292 +0x277 fp=0xc0008b1f60 sp=0xc0008b1ee8 pc=0xa4d837
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0006cd500, 0xb)
	pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc0008b1fd0 sp=0xc0008b1f60 pc=0xa58602
runtime.goexit()
	src/runtime/asm_amd64.s:1371 +0x1 fp=0xc0008b1fd8 sp=0xc0008b1fd0 pc=0x472861
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:380 +0x116