panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0xaec92f]

goroutine 707 [running]:
panic(0x18e49a0, 0x262bbc0)
	GOROOT/src/runtime/panic.go:1065 +0x565 fp=0xc000b03928 sp=0xc000b03860 pc=0x43a6c5
runtime.panicmem()
	GOROOT/src/runtime/panic.go:212 +0x5b fp=0xc000b03948 sp=0xc000b03928 pc=0x43871b
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:734 +0x173 fp=0xc000b03980 sp=0xc000b03948 pc=0x453db3
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).releaseKeptDentriesLocked(0xc000526c60, 0x1d5a6a0, 0xc0001eb500)
	pkg/sentry/fsimpl/kernfs/filesystem.go:272 +0x6f fp=0xc000b03a70 sp=0xc000b03980 pc=0xaec92f
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).Release(0xc000250a50, 0x1d5a6a0, 0xc0001eb500)
	pkg/sentry/fsimpl/kernfs/filesystem.go:258 +0x95 fp=0xc000b03aa8 sp=0xc000b03a70 pc=0xaec815
gvisor.dev/gvisor/pkg/sentry/fsimpl/mqfs.(*filesystem).Release(0xc000250a50, 0x1d5a6a0, 0xc0001eb500)
	pkg/sentry/fsimpl/mqfs/mqfs.go:112 +0xa7 fp=0xc000b03ad8 sp=0xc000b03aa8 pc=0xb24e67
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef.func1()
	pkg/sentry/vfs/filesystem.go:81 +0x148 fp=0xc000b03b30 sp=0xc000b03ad8 pc=0x9823e8
gvisor.dev/gvisor/pkg/sentry/vfs.(*FilesystemRefs).DecRef(0xc000250a50, 0xc000b03bb8)
	bazel-out/k8-fastbuild-ST-0995fa9490c1/bin/pkg/sentry/vfs/filesystem_refs.go:131 +0x7d fp=0xc000b03ba8 sp=0xc000b03b30 pc=0x955bbd
gvisor.dev/gvisor/pkg/sentry/vfs.(*Filesystem).DecRef(0xc000250a50, 0x1d5a6a0, 0xc0001eb500)
	pkg/sentry/vfs/filesystem.go:77 +0x77 fp=0xc000b03be8 sp=0xc000b03ba8 pc=0x955157
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).destroy(0xc0005d9260, 0x1d5a6a0, 0xc0001eb500)
	pkg/sentry/vfs/mount.go:528 +0xe5 fp=0xc000b03c50 sp=0xc000b03be8 pc=0x95ea85
gvisor.dev/gvisor/pkg/sentry/vfs.(*Mount).DecRef(0xc0005d9260, 0x1d5a6a0, 0xc0001eb500)
	pkg/sentry/vfs/mount.go:512 +0xab fp=0xc000b03c78 sp=0xc000b03c50 pc=0x95e98b
gvisor.dev/gvisor/pkg/sentry/fsimpl/mqfs.(*RegistryImpl).Destroy(0xc00000eab0, 0x1d5a6a0, 0xc0001eb500)
	pkg/sentry/fsimpl/mqfs/registry.go:133 +0x9d fp=0xc000b03ca0 sp=0xc000b03c78 pc=0xb26f7d
gvisor.dev/gvisor/pkg/sentry/kernel/mq.(*Registry).Destroy(0xc00003e6a0, 0x1d5a6a0, 0xc0001eb500)
	pkg/sentry/kernel/mq/mq.go:245 +0xbc fp=0xc000b03d18 sp=0xc000b03ca0 pc=0xb1ebdc
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespace).DecRef.func1()
	pkg/sentry/kernel/ipc_namespace.go:106 +0xf5 fp=0xc000b03d68 sp=0xc000b03d18 pc=0xd92bd5
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespaceRefs).DecRef(0xc000397950, 0xc000b03df0)
	bazel-out/k8-fastbuild-ST-0995fa9490c1/bin/pkg/sentry/kernel/ipc_namespace_refs.go:131 +0x7d fp=0xc000b03de0 sp=0xc000b03d68 pc=0xd0617d
gvisor.dev/gvisor/pkg/sentry/kernel.(*IPCNamespace).DecRef(0xc000397950, 0x1d5a6a0, 0xc0001eb500)
	pkg/sentry/kernel/ipc_namespace.go:103 +0x77 fp=0xc000b03e20 sp=0xc000b03de0 pc=0xd05937
gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0x0, 0xc0001eb500, 0x1d2ddc0, 0x0)
	pkg/sentry/kernel/task_exit.go:259 +0x3f4 fp=0xc000b03ed0 sp=0xc000b03e20 pc=0xd43e14
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0001eb500, 0xd)
	pkg/sentry/kernel/task_run.go:97 +0x393 fp=0xc000b03fd0 sp=0xc000b03ed0 pc=0xd549b3
runtime.goexit()
	src/runtime/asm_amd64.s:1371 +0x1 fp=0xc000b03fd8 sp=0xc000b03fd0 pc=0x477541
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:327 +0x1a5