panic: invalid allocation length: 0x0

goroutine 137 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/platform/filemem.(*FileMem).Allocate(0xc4200e5b00, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0)
	pkg/sentry/platform/filemem/filemem.go:232 +0x66f
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/shm.(*Registry).newShm(0xc4200c9d40, 0xc74780, 0xc4204aa900, 0x9, 0x0, 0x0, 0x0, 0x0, 0xc3f11b70, 0xc42041dac8, ...)
	pkg/sentry/kernel/shm/shm.go:201 +0xc0
gvisor.googlesource.com/gvisor/pkg/sentry/kernel/shm.(*Registry).FindOrCreate(0xc4200c9d40, 0xc74780, 0xc4204aa900, 0x9, 0x0, 0x0, 0xc420000001, 0x0, 0x0, 0x0)
	pkg/sentry/kernel/shm/shm.go:190 +0x227
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Shmget(0xc4204aa900, 0x0, 0x0, 0x0, 0x20b39000, 0x4002e0, 0x4002e0, 0x428854, 0xbdd358, 0xc42041dc08, ...)
	pkg/sentry/syscalls/linux/sys_shm.go:38 +0x103
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc4204aa900, 0x1d, 0x0, 0x0, 0x0, 0x20b39000, 0x4002e0, 0x4002e0, 0xc4201d0380, 0xbb4e80, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x307
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc4204aa900, 0x1d, 0x0, 0x0, 0x0, 0x20b39000, 0x4002e0, 0x4002e0, 0x4002e0, 0x4002e0)
	pkg/sentry/kernel/task_syscall.go:278 +0x62
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc4204aa900, 0x1d, 0x0, 0x0, 0x0, 0x20b39000, 0x4002e0, 0x4002e0, 0xc679a0, 0xc42041de00)
	pkg/sentry/kernel/task_syscall.go:241 +0x91
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc4204aa900, 0x2, 0xc4200e0000)
	pkg/sentry/kernel/task_syscall.go:216 +0x10c
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc4204aa900, 0xc679a0, 0x0)
	pkg/sentry/kernel/task_run.go:217 +0xed8
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc4204aa900, 0x9)
	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