panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1ae2d4d]

goroutine 271 [running]:
panic({0x3192e0, 0x2647070})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0001e8940 sp=0xc0001e8880 pc=0x125ea7b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc0001e89a0 sp=0xc0001e8940 pc=0x127793d
gvisor.dev/gvisor/pkg/sentry/kernel.(*TTY).SignalForegroundProcessGroup(0xc00046e0f0, 0x1?)
	pkg/sentry/kernel/tty.go:54 +0xcd fp=0xc0001e8a90 sp=0xc0001e89a0 pc=0x1ae2d4d
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x123540a, 0xc000024000, 0xc000024010, {0xc00073c000, 0x20000, 0x20000})
	pkg/sentry/fsimpl/devpts/line_discipline.go:407 +0x416 fp=0xc0001e8ce8 sp=0xc0001e8a90 pc=0x1ffce16
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc000024010, 0xc0003e0000?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x19f fp=0xc0001e8d98 sp=0xc0001e8ce8 pc=0x200117f
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).read(0xc000024010, {0x819e18, 0xc000562a80}, {{0x8140d0, 0xc0003e0000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/queue.go:140 +0x419 fp=0xc0001e8f78 sp=0xc0001e8d98 pc=0x2000059
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).inputQueueRead(0xc000024000, {0x819e18, 0xc000562a80}, {{0x8140d0, 0xc0003e0000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:197 +0xc6 fp=0xc0001e9010 sp=0xc0001e8f78 pc=0x1ffb806
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*replicaFileDescription).Read(0xc000190800, {0x819e18, 0xc000562a80}, {{0x8140d0, 0xc0003e0000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/replica.go:142 +0xe5 fp=0xc0001e9098 sp=0xc0001e9010 pc=0x20022e5
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Read(0xc000190800, {0x819e18, 0xc000562a80}, {{0x8140d0, 0xc0003e0000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/vfs/file_description.go:643 +0x15e fp=0xc0001e9180 sp=0xc0001e9098 pc=0x178d05e
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.read(0x1cb6920?, 0xc000190800, {{0x8140d0, 0xc0003e0000}, {0x0, 0x0, 0x0, 0x0}, {0x0, 0x1}}, ...)
	pkg/sentry/syscalls/linux/sys_read_write.go:93 +0x9d fp=0xc0001e9370 sp=0xc0001e9180 pc=0x1cd96bd
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readv(0xc000562a80, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/syscalls/linux/sys_read_write.go:87 +0x265 fp=0xc0001e94d8 sp=0xc0001e9370 pc=0x1cd9345
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000562a80, 0x13, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x9b9 fp=0xc0001e99b8 sp=0xc0001e94d8 pc=0x1ad3cd9
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000562a80, 0x0?, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d fp=0xc0001e9a50 sp=0xc0001e99b8 pc=0x1ad5abd
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0007111e0?, 0xc0000002d0?, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x8f fp=0xc0001e9ac8 sp=0xc0001e9a50 pc=0x1ad546f
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000562a80)
	pkg/sentry/kernel/task_syscall.go:257 +0x4c5 fp=0xc0001e9bf0 sp=0xc0001e9ac8 pc=0x1ad5005
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000562a80?, 0xc000562a80)
	pkg/sentry/kernel/task_run.go:265 +0x1d4b fp=0xc0001e9ec8 sp=0xc0001e9bf0 pc=0x1abfa4b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000562a80, 0x8)
	pkg/sentry/kernel/task_run.go:94 +0x36b fp=0xc0001e9fb0 sp=0xc0001e9ec8 pc=0x1abd36b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x48 fp=0xc0001e9fe0 sp=0xc0001e9fb0 pc=0x1ad17e8
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0001e9fe8 sp=0xc0001e9fe0 pc=0x1297921
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x1ad