panic: munmap(7ffa42200000, 200000)) failed: function not implemented

goroutine 533 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc4203a98c0, 0x7ffa42200000, 0x200000)
	pkg/sentry/platform/ptrace/subprocess.go:556 +0x3c6
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc420161900, 0x7ffa42200000, 0x7ffa42400000)
	pkg/sentry/mm/address_space.go:217 +0x74
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).breakCopyOnWriteLocked(0xc420161900, 0xc420161f68, 0x7, 0x7ffa42211000, 0x7ffa42212000, 0x7ffa42211000, 0x7ffa42212000, 0xc420161f68, 0x7, 0xc420161f68)
	pkg/sentry/mm/pma.go:449 +0x8e5
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).getPMAsLocked(0xc420161900, 0xc81780, 0xc42000aec0, 0xc420161970, 0xa, 0x7ffa42211000, 0x7ffa42212000, 0x1, 0xc420161970, 0xb, ...)
	pkg/sentry/mm/pma.go:142 +0x2a2
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).withInternalMappings(0xc420161900, 0xc81780, 0xc42000aec0, 0x7ffa42211970, 0x7ffa422119f0, 0x100, 0xc4213539f0, 0x0, 0x4, 0x4b6bb3)
	pkg/sentry/mm/io.go:484 +0x260
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).CopyOut(0xc420161900, 0xc81780, 0xc42000aec0, 0x7ffa42211970, 0xc423966400, 0x80, 0x80, 0x0, 0xc423966400, 0x80, ...)
	pkg/sentry/mm/io.go:119 +0x14b
gvisor.googlesource.com/gvisor/pkg/sentry/usermem.(*IOReadWriter).Write(0xc421353ae8, 0xc423966400, 0x80, 0x80, 0x10e5d40, 0xb80a00, 0xc42023a840)
	pkg/sentry/usermem/usermem.go:155 +0x7c
gvisor.googlesource.com/gvisor/pkg/sentry/usermem.CopyObjectOut(0xc81780, 0xc42000aec0, 0xc800a0, 0xc420161900, 0x7ffa42211970, 0xb80a00, 0xc42023a840, 0x0, 0x0, 0xc85e20, ...)
	pkg/sentry/usermem/usermem.go:184 +0x10a
gvisor.googlesource.com/gvisor/pkg/sentry/arch.(*Stack).Push(0xc4213835f0, 0xc421353d10, 0x1, 0x1, 0x30, 0x28, 0xb19160)
	pkg/sentry/arch/stack.go:101 +0x214
gvisor.googlesource.com/gvisor/pkg/sentry/arch.(*context64).SignalSetup(0xc42022cd80, 0xc4213835f0, 0xc420ce88a0, 0xc42023a840, 0xc420ce88e0, 0x0, 0xc420040000, 0x0)
	pkg/sentry/arch/signal_amd64.go:391 +0x317
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).deliverSignalToHandler(0xc42063bb00, 0xc42023a840, 0x402810, 0x44000004, 0x40f880, 0x0, 0xc421353e18, 0x6fb5a8)
	pkg/sentry/kernel/task_signals.go:259 +0x24d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).deliverSignal(0xc42063bb00, 0xc42023a840, 0x402810, 0x44000004, 0x40f880, 0x0, 0xc420161900, 0xc42023a840)
	pkg/sentry/kernel/task_signals.go:214 +0x345
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runInterrupt).execute(0x0, 0xc42063bb00, 0xc744c0, 0x0)
	pkg/sentry/kernel/task_signals.go:1016 +0x58d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc42063bb00, 0x50)
	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