panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0x8486a2]

goroutine 543 [running]:
panic(0x11235e0, 0x1cb2140)
	GOROOT/src/runtime/panic.go:1065 +0x565 fp=0xc0005eda78 sp=0xc0005ed9b0 pc=0x437c65
runtime.panicmem()
	GOROOT/src/runtime/panic.go:212 +0x5b fp=0xc0005eda98 sp=0xc0005eda78 pc=0x435cbb
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:734 +0x173 fp=0xc0005edad0 sp=0xc0005eda98 pc=0x44fa93
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).releaseKeptDentriesLocked(0xc000012120, 0x1476ce0, 0xc0002d7500)
	pkg/sentry/fsimpl/kernfs/filesystem.go:272 +0x42 fp=0xc0005edbb8 sp=0xc0005edad0 pc=0x8486a2
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).Release(0xc00039c000, 0x1476ce0, 0xc0002d7500)
	pkg/sentry/fsimpl/kernfs/filesystem.go:258 +0x70 fp=0xc0005edbf0 sp=0xc0005edbb8 pc=0x8485d0
gvisor.dev/gvisor/pkg/sentry/fsimpl/mqfs.(*filesystem).Release(0xc00039c000, 0x1476ce0, 0xc0002d7500)
	pkg/sentry/fsimpl/mqfs/mqfs.go:112 +0x5b fp=0xc0005edc18 sp=0xc0005edbf0 pc=0x86d19b
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef.func1()
	pkg/sentry/vfs/filesystem.go:81 +0xc5 fp=0xc0005edc58 sp=0xc0005edc18 pc=0x76b8c5
gvisor.dev/gvisor/pkg/sentry/vfs.(*FilesystemRefs).DecRef(0xc00039c000, 0xc0005edce0)
	bazel-out/k8-fastbuild-ST-4c64f0b3d5c7/bin/pkg/sentry/vfs/filesystem_refs.go:131 +0x5a fp=0xc0005edcd0 sp=0xc0005edc58 pc=0x74cfba
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef(0xc00039c000, 0x1476ce0, 0xc0002d7500)
	pkg/sentry/vfs/filesystem.go:77 +0x69 fp=0xc0005edd10 sp=0xc0005edcd0 pc=0x74c7a9
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy(0xc000316a80, 0x1476ce0, 0xc0002d7500)
	pkg/sentry/vfs/mount.go:528 +0x6b fp=0xc0005edd60 sp=0xc0005edd10 pc=0x752dcb
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).DecRef(0xc000316a80, 0x1476ce0, 0xc0002d7500)
	pkg/sentry/vfs/mount.go:512 +0x7d fp=0xc0005edd88 sp=0xc0005edd60 pc=0x752d3d
gvisor.dev/gvisor/pkg/sentry/fsimpl/mqfs.(*RegistryImpl).Destroy(0xc0001ba5e8, 0x1476ce0, 0xc0002d7500)
	pkg/sentry/fsimpl/mqfs/registry.go:133 +0x6b fp=0xc0005eddb0 sp=0xc0005edd88 pc=0x86e76b
gvisor.dev/gvisor/pkg/sentry/kernel/mq.(*Registry).Destroy(0xc000220300, 0x1476ce0, 0xc0002d7500)
	pkg/sentry/kernel/mq/mq.go:245 +0x8d fp=0xc0005eddf8 sp=0xc0005eddb0 pc=0x86982d
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespace).DecRef.func1()
	pkg/sentry/kernel/ipc_namespace.go:106 +0x85 fp=0xc0005ede38 sp=0xc0005eddf8 pc=0x9f42c5
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespaceRefs).DecRef(0xc0005cec00, 0xc0005edec0)
	bazel-out/k8-fastbuild-ST-4c64f0b3d5c7/bin/pkg/sentry/kernel/ipc_namespace_refs.go:131 +0x5a fp=0xc0005edeb0 sp=0xc0005ede38 pc=0x99e6fa
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespace).DecRef(0xc0005cec00, 0x1476ce0, 0xc0002d7500)
	pkg/sentry/kernel/ipc_namespace.go:103 +0x69 fp=0xc0005edef0 sp=0xc0005edeb0 pc=0x99e0a9
gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0x0, 0xc0002d7500, 0x144a940, 0x0)
	pkg/sentry/kernel/task_exit.go:259 +0x1ea fp=0xc0005edf60 sp=0xc0005edef0 pc=0x9c31ea
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0002d7500, 0x11)
	pkg/sentry/kernel/task_run.go:97 +0x1af fp=0xc0005edfd0 sp=0xc0005edf60 pc=0x9cbd2f
runtime.goexit()
	src/runtime/asm_amd64.s:1371 +0x1 fp=0xc0005edfd8 sp=0xc0005edfd0 pc=0x472861
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:327 +0xfe