panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x91d130]

goroutine 243 [running]:
panic({0x10ec200, 0x1e68c20})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000e112c8 sp=0xc000e11208 pc=0x436c1b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000e11328 sp=0xc000e112c8 pc=0x44e23d
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).SendSignal(0x0, 0xc000e11598)
	pkg/sentry/kernel/sessions.go:237 +0x50 fp=0xc000e11418 sp=0xc000e11328 pc=0x91d130
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x14c8ed8, 0xc000158180, 0xc000158190, {0xc000200452?, 0xa6c28a?, 0xc000e116f4?})
	pkg/sentry/fsimpl/devpts/line_discipline.go:400 +0x34e fp=0xc000e11640 sp=0xc000e11418 pc=0xc894ce
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc000158190, 0x14bbc90?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x99 fp=0xc000e116a8 sp=0xc000e11640 pc=0xc8bd79
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).setTermios(0xc000158180, 0x14c8ed8?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:150 +0x159 fp=0xc000e11748 sp=0xc000e116a8 pc=0xc87dd9
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*masterFileDescription).Ioctl(0xc000e04200, {0x14c8ed8, 0xc000896a80}, {0x14c3190, 0xc0000fe000}, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, ...})
	pkg/sentry/fsimpl/devpts/master.go:159 +0x105 fp=0xc000e117b0 sp=0xc000e11748 pc=0xc8a245
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Ioctl(...)
	pkg/sentry/vfs/file_description.go:707
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Ioctl(0xc000896a80, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_file.go:286 +0x3b0 fp=0xc000e11880 sp=0xc000e117b0 pc=0xa6cbf0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000896a80, 0x10, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x755 fp=0xc000e11c70 sp=0xc000e11880 pc=0x942635
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000896a80, 0x0?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4a fp=0xc000e11cd0 sp=0xc000e11c70 pc=0x94386a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00027efc0?, 0xc000e11e18?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x65 fp=0xc000e11d30 sp=0xc000e11cd0 pc=0x943545
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0008d2000?)
	pkg/sentry/kernel/task_syscall.go:257 +0x2f0 fp=0xc000e11e28 sp=0xc000e11d30 pc=0x9432b0
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000e04000?, 0xc000896a80)
	pkg/sentry/kernel/task_run.go:265 +0x103e fp=0xc000e11f60 sp=0xc000e11e28 pc=0x9374de
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000896a80, 0x19)
	pkg/sentry/kernel/task_run.go:94 +0x1b8 fp=0xc000e11fc0 sp=0xc000e11f60 pc=0x935e78
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x2a fp=0xc000e11fe0 sp=0xc000e11fc0 pc=0x940e2a
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000e11fe8 sp=0xc000e11fe0 pc=0x46d5e1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0xef