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

goroutine 290 [running]:
panic({0x10ec200, 0x1e68c20})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000c04ec8 sp=0xc000c04e08 pc=0x436c1b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000c04f28 sp=0xc000c04ec8 pc=0x44e23d
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).SendSignal(0x0, 0xc000c05198)
	pkg/sentry/kernel/sessions.go:237 +0x50 fp=0xc000c05018 sp=0xc000c04f28 pc=0x91d130
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x0, 0xc000128180, 0xc000128190, {0xc000c80000?, 0xc000a8a4c0?, 0x0?})
	pkg/sentry/fsimpl/devpts/line_discipline.go:400 +0x34e fp=0xc000c05240 sp=0xc000c05018 pc=0xc894ce
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc000128190, 0xc000b2c000?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x99 fp=0xc000c052a8 sp=0xc000c05240 pc=0xc8bd79
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).read(0xc000128190, {0x14c8ed8, 0xc000b54000}, {{0x14c3190, 0xc000b2c000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/queue.go:140 +0x3ba fp=0xc000c05430 sp=0xc000c052a8 pc=0xc8b27a
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).inputQueueRead(0xc000128180, {0x14c8ed8?, 0xc000b54000?}, {{0x14c3190, 0xc000b2c000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:194 +0xbf fp=0xc000c054b8 sp=0xc000c05430 pc=0xc8843f
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*replicaFileDescription).Read(0x0?, {0x14c8ed8?, 0xc000b54000?}, {{0x14c3190, 0xc000b2c000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/replica.go:138 +0x65 fp=0xc000c05518 sp=0xc000c054b8 pc=0xc8c6a5
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Read(0xc000aa4300, {0x14c8ed8, 0xc000b54000}, {{0x14c3190, 0xc000b2c000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/vfs/file_description.go:643 +0xf5 fp=0xc000c055b8 sp=0xc000c05518 pc=0x73f715
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.read(0x9?, 0xc000aa4300, {{0x14c3190, 0xc000b2c000}, {0x0, 0x0, 0x0, 0x0}, {0x0, 0x1}}, ...)
	pkg/sentry/syscalls/linux/sys_read_write.go:93 +0x85 fp=0xc000c05778 sp=0xc000c055b8 pc=0xa83625
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readv(0xc000b54000, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0xd}})
	pkg/sentry/syscalls/linux/sys_read_write.go:87 +0x1b4 fp=0xc000c05880 sp=0xc000c05778 pc=0xa83374
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000b54000, 0x13, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0xd}})
	pkg/sentry/kernel/task_syscall.go:142 +0x755 fp=0xc000c05c70 sp=0xc000c05880 pc=0x942635
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000b54000, 0x0?, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0xd}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4a fp=0xc000c05cd0 sp=0xc000c05c70 pc=0x94386a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0002866c0?, 0xc000c05e18?, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0xd}})
	pkg/sentry/kernel/task_syscall.go:282 +0x65 fp=0xc000c05d30 sp=0xc000c05cd0 pc=0x943545
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000b56000?)
	pkg/sentry/kernel/task_syscall.go:257 +0x2f0 fp=0xc000c05e28 sp=0xc000c05d30 pc=0x9432b0
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000aa4080?, 0xc000b54000)
	pkg/sentry/kernel/task_run.go:265 +0x103e fp=0xc000c05f60 sp=0xc000c05e28 pc=0x9374de
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000b54000, 0x18)
	pkg/sentry/kernel/task_run.go:94 +0x1b8 fp=0xc000c05fc0 sp=0xc000c05f60 pc=0x935e78
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x2a fp=0xc000c05fe0 sp=0xc000c05fc0 pc=0x940e2a
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000c05fe8 sp=0xc000c05fe0 pc=0x46d5e1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0xef