panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1aea7e0]

goroutine 120416 [running]:
panic({0x319340, 0x26cebd0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000646a28 sp=0xc000646968 pc=0x11b32db
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000646a88 sp=0xc000646a28 pc=0x11cc19d
gvisor.dev/gvisor/pkg/sentry/kernel.(*TTY).SignalForegroundProcessGroup(0xc0061f3590, 0x1?)
	pkg/sentry/kernel/tty.go:54 +0xe0 fp=0xc000646b80 sp=0xc000646a88 pc=0x1aea7e0
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x0, 0xc0003a4180, 0xc0003a4190, {0xc001fd6021, 0xff0d, 0xff0d})
	pkg/sentry/fsimpl/devpts/line_discipline.go:411 +0x73b fp=0xc000646dd0 sp=0xc000646b80 pc=0x207657b
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc0003a4190, 0xc000c33500?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x1e2 fp=0xc000646e80 sp=0xc000646dd0 pc=0x207b002
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).read(0xc0003a4190, {0x742e98, 0xc000c33500}, {{0x73d3d0, 0xc00484c000}, {0x0, 0x1, 0x200011c0, 0x1000}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/queue.go:140 +0x507 fp=0xc000647078 sp=0xc000646e80 pc=0x2079d27
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).inputQueueRead(0xc0003a4180, {0x742e98, 0xc000c33500}, {{0x73d3d0, 0xc00484c000}, {0x0, 0x1, 0x200011c0, 0x2044}, {0x0, ...}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:197 +0xd7 fp=0xc000647110 sp=0xc000647078 pc=0x20746d7
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*replicaFileDescription).Read(0xc0029eb880, {0x742e98, 0xc000c33500}, {{0x73d3d0, 0xc00484c000}, {0x0, 0x1, 0x200011c0, 0x2044}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/replica.go:142 +0xf7 fp=0xc000647198 sp=0xc000647110 pc=0x207c3f7
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Read(0xc0029eb880, {0x742e98, 0xc000c33500}, {{0x73d3d0, 0xc00484c000}, {0x0, 0x1, 0x200011c0, 0x2044}, {0x0, ...}}, ...)
	pkg/sentry/vfs/file_description.go:643 +0x16b fp=0xc000647278 sp=0xc000647198 pc=0x172976b
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.read(0xc000000001?, 0x11ef525?, {{0x73d3d0, 0xc00484c000}, {0x0, 0x1, 0x200011c0, 0x2044}, {0x0, 0x1}}, ...)
	pkg/sentry/syscalls/linux/sys_read_write.go:93 +0xae fp=0xc000647408 sp=0xc000647278 pc=0x1d10b4e
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Read(0xc000c33500, {{0x3}, {0x200011c0}, {0x2044}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_read_write.go:62 +0x34f fp=0xc0006475a8 sp=0xc000647408 pc=0x1d100ef
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000c33500, 0x0, {{0x3}, {0x200011c0}, {0x2044}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0xab7 fp=0xc0006479c0 sp=0xc0006475a8 pc=0x1ad8697
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000c33500, 0x1?, {{0x3}, {0x200011c0}, {0x2044}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x8e fp=0xc000647a60 sp=0xc0006479c0 pc=0x1ada7ae
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0070e8690?, 0xc000647b8f?, {{0x3}, {0x200011c0}, {0x2044}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0xc5 fp=0xc000647ad8 sp=0xc000647a60 pc=0x1ada0a5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000c33500)
	pkg/sentry/kernel/task_syscall.go:257 +0x53b fp=0xc000647c00 sp=0xc000647ad8 pc=0x1ad9bbb
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000c33500?, 0xc000c33500)
	pkg/sentry/kernel/task_run.go:265 +0x22b4 fp=0xc000647ec0 sp=0xc000647c00 pc=0x1ac2934
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000c33500, 0xa54)
	pkg/sentry/kernel/task_run.go:94 +0x2cc fp=0xc000647fb0 sp=0xc000647ec0 pc=0x1abfcac
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x48 fp=0xc000647fe0 sp=0xc000647fb0 pc=0x1ad5d88
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000647fe8 sp=0xc000647fe0 pc=0x11ec181
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x1da