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

goroutine 275 [running]:
panic({0x10ec200, 0x1e68c20})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc00054d2c8 sp=0xc00054d208 pc=0x436c1b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc00054d328 sp=0xc00054d2c8 pc=0x44e23d
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).SendSignal(0x0, 0xc00054d598)
	pkg/sentry/kernel/sessions.go:237 +0x50 fp=0xc00054d418 sp=0xc00054d328 pc=0x91d130
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x14c8eb8, 0xc0002e2180, 0xc0002e2190, {0xc0007b4a36?, 0xa6c28a?, 0xc00054d6f4?})
	pkg/sentry/fsimpl/devpts/line_discipline.go:400 +0x34e fp=0xc00054d640 sp=0xc00054d418 pc=0xc894ce
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc0002e2190, 0x14bbc70?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x99 fp=0xc00054d6a8 sp=0xc00054d640 pc=0xc8bd79
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).setTermios(0xc0002e2180, 0x14c8eb8?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:150 +0x159 fp=0xc00054d748 sp=0xc00054d6a8 pc=0xc87dd9
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*masterFileDescription).Ioctl(0xc00058c200, {0x14c8eb8, 0xc000639500}, {0x14c3170, 0xc00034a000}, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, ...})
	pkg/sentry/fsimpl/devpts/master.go:159 +0x105 fp=0xc00054d7b0 sp=0xc00054d748 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(0xc000639500, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_file.go:286 +0x3b0 fp=0xc00054d880 sp=0xc00054d7b0 pc=0xa6cbf0
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000639500, 0x10, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x755 fp=0xc00054dc70 sp=0xc00054d880 pc=0x942635
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000639500, 0x85?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4a fp=0xc00054dcd0 sp=0xc00054dc70 pc=0x94386a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00034a878?, 0x0?, {{0x3}, {0x5403}, {0x0}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x65 fp=0xc00054dd30 sp=0xc00054dcd0 pc=0x943545
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00048c8f0?)
	pkg/sentry/kernel/task_syscall.go:257 +0x2f0 fp=0xc00054de28 sp=0xc00054dd30 pc=0x9432b0
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc00031e000?, 0xc000639500)
	pkg/sentry/kernel/task_run.go:265 +0x103e fp=0xc00054df60 sp=0xc00054de28 pc=0x9374de
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000639500, 0x11)
	pkg/sentry/kernel/task_run.go:94 +0x1b8 fp=0xc00054dfc0 sp=0xc00054df60 pc=0x935e78
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x2a fp=0xc00054dfe0 sp=0xc00054dfc0 pc=0x940e2a
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc00054dfe8 sp=0xc00054dfe0 pc=0x46d5e1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0xef