panic: munmap(7f93cc200000, 200000)) failed: function not implemented

goroutine 224 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc420568ea0, 0x7f93cc200000, 0x200000)
	pkg/sentry/platform/ptrace/subprocess.go:556 +0x3c6
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc4203a0c80, 0x7f93cc200000, 0x7f93cc400000)
	pkg/sentry/mm/address_space.go:217 +0x74
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).breakCopyOnWriteLocked(0xc4203a0c80, 0xc4203a12e8, 0x6, 0x7f93cc2fc000, 0x7f93cc2fd000, 0x7f93cc2fc000, 0x7f93cc2fd000, 0xc4203a12e8, 0x6, 0xc4203a12e8)
	pkg/sentry/mm/pma.go:449 +0x8e5
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).getPMAsLocked(0xc4203a0c80, 0xc7ac60, 0xc4b2fd1d00, 0xc4203a0cf0, 0xa, 0x7f93cc2fc000, 0x7f93cc2fd000, 0x1, 0xc4203a0cf0, 0xb, ...)
	pkg/sentry/mm/pma.go:142 +0x2a2
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).withInternalMappings(0xc4203a0c80, 0xc7ac60, 0xc4b2fd1d00, 0x7f93cc2fc970, 0x7f93cc2fc9f0, 0x100, 0xc4206d99f0, 0x0, 0x4, 0x4b6b93)
	pkg/sentry/mm/io.go:484 +0x260
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).CopyOut(0xc4203a0c80, 0xc7ac60, 0xc4b2fd1d00, 0x7f93cc2fc970, 0xc423078f80, 0x80, 0x80, 0x0, 0xc423078f80, 0x80, ...)
	pkg/sentry/mm/io.go:119 +0x14b
gvisor.googlesource.com/gvisor/pkg/sentry/usermem.(*IOReadWriter).Write(0xc4206d9ae8, 0xc423078f80, 0x80, 0x80, 0x10dbd18, 0xb7aae0, 0xc42044c540)
	pkg/sentry/usermem/usermem.go:155 +0x7c
gvisor.googlesource.com/gvisor/pkg/sentry/usermem.CopyObjectOut(0xc7ac60, 0xc4b2fd1d00, 0xc79580, 0xc4203a0c80, 0x7f93cc2fc970, 0xb7aae0, 0xc42044c540, 0x0, 0x0, 0xc7f500, ...)
	pkg/sentry/usermem/usermem.go:184 +0x10a
gvisor.googlesource.com/gvisor/pkg/sentry/arch.(*Stack).Push(0xc4bec78a80, 0xc4206d9d10, 0x1, 0x1, 0x30, 0x28, 0xb13300)
	pkg/sentry/arch/stack.go:101 +0x214
gvisor.googlesource.com/gvisor/pkg/sentry/arch.(*context64).SignalSetup(0xc420137440, 0xc4bec78a80, 0xc422729380, 0xc42044c540, 0xc4227293a0, 0x0, 0xc422a4fa98, 0xc422a4faa0)
	pkg/sentry/arch/signal_amd64.go:391 +0x317
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).deliverSignalToHandler(0xc42017fb00, 0xc42044c540, 0x402c60, 0x44000004, 0x40fcb0, 0x0, 0xc42043e4e0, 0x1)
	pkg/sentry/kernel/task_signals.go:259 +0x24d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).deliverSignal(0xc42017fb00, 0xc42044c540, 0x402c60, 0x44000004, 0x40fcb0, 0x0, 0xc42044c540, 0xc6f320)
	pkg/sentry/kernel/task_signals.go:214 +0x345
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runInterrupt).execute(0x0, 0xc42017fb00, 0xc6d9a0, 0x0)
	pkg/sentry/kernel/task_signals.go:1016 +0x58d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc42017fb00, 0x46)
	pkg/sentry/kernel/task_run.go:95 +0x174
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:258 +0x100