panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1a90c6d]

goroutine 259 [running]:
panic({0x319320, 0x26ce990})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000c38db8 sp=0xc000c38cf8 pc=0x11b33fb
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000c38e18 sp=0xc000c38db8 pc=0x11cc2bd
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).SendSignal(0x0, 0xc000c390c8)
	pkg/sentry/kernel/sessions.go:237 +0x6d fp=0xc000c38f50 sp=0xc000c38e18 pc=0x1a90c6d
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0xc0002d2010, 0xc0002d2000, 0xc0002d2010, {0xc0001f6136, 0x4a, 0x4a})
	pkg/sentry/fsimpl/devpts/line_discipline.go:400 +0x585 fp=0xc000c391a0 sp=0xc000c38f50 pc=0x2075d65
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc0002d2010, 0x0?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x1e2 fp=0xc000c39250 sp=0xc000c391a0 pc=0x207a762
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).setTermios(0xc0002d2000, 0x86?, {{0x3}, {0x5403}, {0x0}, {0x7f26c8359e78}, {0x7f26c8359e78}, {0x7f26c8359e78}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:150 +0x1eb fp=0xc000c392f8 sp=0xc000c39250 pc=0x207374b
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*masterFileDescription).Ioctl(0xc000bc0200, {0x742e58, 0xc00057ea80}, {0x73d390, 0xc000718000}, {{0x3}, {0x5403}, {0x0}, {0x7f26c8359e78}, {0x7f26c8359e78}, ...})
	pkg/sentry/fsimpl/devpts/master.go:159 +0x1a5 fp=0xc000c39398 sp=0xc000c392f8 pc=0x2077905
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Ioctl(0xc000bc0200, {0x742e58, 0xc00057ea80}, {0x73d390, 0xc000718000}, {{0x3}, {0x5403}, {0x0}, {0x7f26c8359e78}, {0x7f26c8359e78}, ...})
	pkg/sentry/vfs/file_description.go:707 +0x105 fp=0xc000c39448 sp=0xc000c39398 pc=0x172a305
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Ioctl(0xc00057ea80, {{0x3}, {0x5403}, {0x0}, {0x7f26c8359e78}, {0x7f26c8359e78}, {0x7f26c8359e78}})
	pkg/sentry/syscalls/linux/sys_file.go:286 +0x675 fp=0xc000c395a8 sp=0xc000c39448 pc=0x1ce5955
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00057ea80, 0x10, {{0x3}, {0x5403}, {0x0}, {0x7f26c8359e78}, {0x7f26c8359e78}, {0x7f26c8359e78}})
	pkg/sentry/kernel/task_syscall.go:142 +0xab7 fp=0xc000c399c0 sp=0xc000c395a8 pc=0x1ad8477
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00057ea80, 0x1?, {{0x3}, {0x5403}, {0x0}, {0x7f26c8359e78}, {0x7f26c8359e78}, {0x7f26c8359e78}})
	pkg/sentry/kernel/task_syscall.go:322 +0x8e fp=0xc000c39a60 sp=0xc000c399c0 pc=0x1ada58e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0005760f0?, 0xc000c39b8f?, {{0x3}, {0x5403}, {0x0}, {0x7f26c8359e78}, {0x7f26c8359e78}, {0x7f26c8359e78}})
	pkg/sentry/kernel/task_syscall.go:282 +0xc5 fp=0xc000c39ad8 sp=0xc000c39a60 pc=0x1ad9e85
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00057ea80)
	pkg/sentry/kernel/task_syscall.go:257 +0x53b fp=0xc000c39c00 sp=0xc000c39ad8 pc=0x1ad999b
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc00057ea80?, 0xc00057ea80)
	pkg/sentry/kernel/task_run.go:265 +0x22b4 fp=0xc000c39ec0 sp=0xc000c39c00 pc=0x1ac2714
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00057ea80, 0xe)
	pkg/sentry/kernel/task_run.go:94 +0x2cc fp=0xc000c39fb0 sp=0xc000c39ec0 pc=0x1abfa8c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x48 fp=0xc000c39fe0 sp=0xc000c39fb0 pc=0x1ad5b68
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000c39fe8 sp=0xc000c39fe0 pc=0x11ec2a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x1da