panic: munmap(7fe3dfc00000, 200000)) failed: function not implemented

goroutine 378632 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace.(*subprocess).Unmap(0xc4203cc5a0, 0x7fe3dfc00000, 0x200000)
	pkg/sentry/platform/ptrace/subprocess.go:556 +0x3c6
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).unmapASLocked(0xc420a13200, 0x7fe3dfc00000, 0x7fe3dfe00000)
	pkg/sentry/mm/address_space.go:217 +0x74
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).breakCopyOnWriteLocked(0xc420a13200, 0xc420a13868, 0x7, 0x7fe3dfcc7000, 0x7fe3dfcc8000, 0x7fe3dfcc7000, 0x7fe3dfcc8000, 0xc420a13868, 0x7, 0xc420a13868)
	pkg/sentry/mm/pma.go:449 +0x8e5
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).getPMAsLocked(0xc420a13200, 0xc75c20, 0xc42073e440, 0xc420a13270, 0xa, 0x7fe3dfcc7000, 0x7fe3dfcc8000, 0x1, 0xc420a13270, 0xb, ...)
	pkg/sentry/mm/pma.go:142 +0x2a2
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).withInternalMappings(0xc420a13200, 0xc75c20, 0xc42073e440, 0x7fe3dfcc7970, 0x7fe3dfcc79f0, 0x100, 0xc4206119f0, 0x0, 0x4, 0x4b6b93)
	pkg/sentry/mm/io.go:484 +0x260
gvisor.googlesource.com/gvisor/pkg/sentry/mm.(*MemoryManager).CopyOut(0xc420a13200, 0xc75c20, 0xc42073e440, 0x7fe3dfcc7970, 0xc422058080, 0x80, 0x80, 0x0, 0xc422058080, 0x80, ...)
	pkg/sentry/mm/io.go:119 +0x14b
gvisor.googlesource.com/gvisor/pkg/sentry/usermem.(*IOReadWriter).Write(0xc420611ae8, 0xc422058080, 0x80, 0x80, 0x10d5d18, 0xb76560, 0xc4204ace40)
	pkg/sentry/usermem/usermem.go:155 +0x7c
gvisor.googlesource.com/gvisor/pkg/sentry/usermem.CopyObjectOut(0xc75c20, 0xc42073e440, 0xc74540, 0xc420a13200, 0x7fe3dfcc7970, 0xb76560, 0xc4204ace40, 0x0, 0x0, 0xc7a300, ...)
	pkg/sentry/usermem/usermem.go:184 +0x10a
gvisor.googlesource.com/gvisor/pkg/sentry/arch.(*Stack).Push(0xc4202932c0, 0xc420611d10, 0x1, 0x1, 0x30, 0x28, 0xb0eec0)
	pkg/sentry/arch/stack.go:101 +0x214
gvisor.googlesource.com/gvisor/pkg/sentry/arch.(*context64).SignalSetup(0xc4202c39e0, 0xc4202932c0, 0xc421356000, 0xc4204ace40, 0xc421356060, 0x0, 0xc420564f98, 0xc420564fa0)
	pkg/sentry/arch/signal_amd64.go:391 +0x317
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).deliverSignalToHandler(0xc4213e6000, 0xc4204ace40, 0x402c60, 0x44000004, 0x40f900, 0x0, 0xc420503020, 0x1)
	pkg/sentry/kernel/task_signals.go:259 +0x24d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).deliverSignal(0xc4213e6000, 0xc4204ace40, 0x402c60, 0x44000004, 0x40f900, 0x0, 0xc4204ace40, 0xc6a3e0)
	pkg/sentry/kernel/task_signals.go:214 +0x345
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runInterrupt).execute(0x0, 0xc4213e6000, 0xc68a60, 0x0)
	pkg/sentry/kernel/task_signals.go:1016 +0x58d
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc4213e6000, 0x42a8)
	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:251 +0x100