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

goroutine 141 [running]:
panic({0x319320, 0x26ce990})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000b52db8 sp=0xc000b52cf8 pc=0x11b33fb
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000b52e18 sp=0xc000b52db8 pc=0x11cc2bd
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).SendSignal(0x0, 0xc000b530c8)
	pkg/sentry/kernel/sessions.go:237 +0x6d fp=0xc000b52f50 sp=0xc000b52e18 pc=0x1a90c6d
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0xc00029c010, 0xc00029c000, 0xc00029c010, {0xc00047d052, 0x38b, 0x38b})
	pkg/sentry/fsimpl/devpts/line_discipline.go:400 +0x585 fp=0xc000b531a0 sp=0xc000b52f50 pc=0x2075d65
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc00029c010, 0x0?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x1e2 fp=0xc000b53250 sp=0xc000b531a0 pc=0x207a762
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).setTermios(0xc00029c000, 0x85?, {{0x3}, {0x5403}, {0x0}, {0x7f317a117e78}, {0x7f317a117e78}, {0x7f317a117e78}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:150 +0x1eb fp=0xc000b532f8 sp=0xc000b53250 pc=0x207374b
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*masterFileDescription).Ioctl(0xc000238b80, {0x742e58, 0xc00056f500}, {0x73d390, 0xc00069e000}, {{0x3}, {0x5403}, {0x0}, {0x7f317a117e78}, {0x7f317a117e78}, ...})
	pkg/sentry/fsimpl/devpts/master.go:159 +0x1a5 fp=0xc000b53398 sp=0xc000b532f8 pc=0x2077905
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Ioctl(0xc000238b80, {0x742e58, 0xc00056f500}, {0x73d390, 0xc00069e000}, {{0x3}, {0x5403}, {0x0}, {0x7f317a117e78}, {0x7f317a117e78}, ...})
	pkg/sentry/vfs/file_description.go:707 +0x105 fp=0xc000b53448 sp=0xc000b53398 pc=0x172a305
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Ioctl(0xc00056f500, {{0x3}, {0x5403}, {0x0}, {0x7f317a117e78}, {0x7f317a117e78}, {0x7f317a117e78}})
	pkg/sentry/syscalls/linux/sys_file.go:286 +0x675 fp=0xc000b535a8 sp=0xc000b53448 pc=0x1ce5955
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00056f500, 0x10, {{0x3}, {0x5403}, {0x0}, {0x7f317a117e78}, {0x7f317a117e78}, {0x7f317a117e78}})
	pkg/sentry/kernel/task_syscall.go:142 +0xab7 fp=0xc000b539c0 sp=0xc000b535a8 pc=0x1ad8477
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00056f500, 0x1?, {{0x3}, {0x5403}, {0x0}, {0x7f317a117e78}, {0x7f317a117e78}, {0x7f317a117e78}})
	pkg/sentry/kernel/task_syscall.go:322 +0x8e fp=0xc000b53a60 sp=0xc000b539c0 pc=0x1ada58e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00056c1e0?, 0xc000b53b8f?, {{0x3}, {0x5403}, {0x0}, {0x7f317a117e78}, {0x7f317a117e78}, {0x7f317a117e78}})
	pkg/sentry/kernel/task_syscall.go:282 +0xc5 fp=0xc000b53ad8 sp=0xc000b53a60 pc=0x1ad9e85
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00056f500)
	pkg/sentry/kernel/task_syscall.go:257 +0x53b fp=0xc000b53c00 sp=0xc000b53ad8 pc=0x1ad999b
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc00056f500?, 0xc00056f500)
	pkg/sentry/kernel/task_run.go:265 +0x22b4 fp=0xc000b53ec0 sp=0xc000b53c00 pc=0x1ac2714
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00056f500, 0xe)
	pkg/sentry/kernel/task_run.go:94 +0x2cc fp=0xc000b53fb0 sp=0xc000b53ec0 pc=0x1abfa8c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x48 fp=0xc000b53fe0 sp=0xc000b53fb0 pc=0x1ad5b68
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000b53fe8 sp=0xc000b53fe0 pc=0x11ec2a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x1da