panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1ae310d]

goroutine 1308974 [running]:
panic({0x3192e0, 0x2647430})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0031aaa08 sp=0xc0031aa948 pc=0x125eb5b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc0031aaa68 sp=0xc0031aaa08 pc=0x1277a1d
gvisor.dev/gvisor/pkg/sentry/kernel.(*TTY).SignalForegroundProcessGroup(0xc001462cf0, 0x1?)
	pkg/sentry/kernel/tty.go:54 +0xcd fp=0xc0031aab58 sp=0xc0031aaa68 pc=0x1ae310d
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x12354ea, 0xc0002ce300, 0xc0002ce310, {0xc000376400, 0x3c5, 0x3c5})
	pkg/sentry/fsimpl/devpts/line_discipline.go:407 +0x416 fp=0xc0031aadb0 sp=0xc0031aab58 pc=0x1ffd1d6
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc0002ce310, 0xc0066ee000?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x19f fp=0xc0031aae60 sp=0xc0031aadb0 pc=0x200153f
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).write(0xc0002ce310, {0x819e98, 0xc006ec2a80}, {{0x814150, 0xc0066ee000}, {0xc00249e380, 0x8, 0x0, 0x3c5}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/queue.go:183 +0x269 fp=0xc0031aaf98 sp=0xc0031aae60 pc=0x2000ae9
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).inputQueueWrite(0xc0002ce300, {0x819e98, 0xc006ec2a80}, {{0x814150, 0xc0066ee000}, {0xc00249e380, 0x8, 0x0, 0x3c5}, {0x0, ...}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:220 +0xc6 fp=0xc0031ab030 sp=0xc0031aaf98 pc=0x1ffbe06
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*masterFileDescription).Write(0xc006b87380, {0x819e98, 0xc006ec2a80}, {{0x814150, 0xc0066ee000}, {0xc00249e380, 0x8, 0x0, 0x3c5}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/master.go:134 +0xc5 fp=0xc0031ab0b0 sp=0xc0031ab030 pc=0x1ffe8e5
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Write(0xc006b87380, {0x819e98, 0xc006ec2a80}, {{0x814150, 0xc0066ee000}, {0xc00249e380, 0x8, 0x0, 0x3c5}, {0x0, ...}}, ...)
	pkg/sentry/vfs/file_description.go:674 +0x125 fp=0xc0031ab180 sp=0xc0031ab0b0 pc=0x178d985
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.write(0xffffffff?, 0xc006b87380, {{0x814150, 0xc0066ee000}, {0xc00249e380, 0x8, 0x0, 0x3c5}, {0x0, 0x1}}, ...)
	pkg/sentry/syscalls/linux/sys_read_write.go:347 +0x9d fp=0xc0031ab370 sp=0xc0031ab180 pc=0x1cdcb9d
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Writev(0xc006ec2a80, {{0x4}, {0x200006c0}, {0x8}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_read_write.go:341 +0x265 fp=0xc0031ab4d8 sp=0xc0031ab370 pc=0x1cdc825
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc006ec2a80, 0x14, {{0x4}, {0x200006c0}, {0x8}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x9b9 fp=0xc0031ab9b8 sp=0xc0031ab4d8 pc=0x1ad4099
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc006ec2a80, 0x0?, {{0x4}, {0x200006c0}, {0x8}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d fp=0xc0031aba50 sp=0xc0031ab9b8 pc=0x1ad5e7d
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc001aff930?, 0xc0006e8000?, {{0x4}, {0x200006c0}, {0x8}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x8f fp=0xc0031abac8 sp=0xc0031aba50 pc=0x1ad582f
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc006ec2a80)
	pkg/sentry/kernel/task_syscall.go:257 +0x4c5 fp=0xc0031abbf0 sp=0xc0031abac8 pc=0x1ad53c5
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc006ec2a80?, 0xc006ec2a80)
	pkg/sentry/kernel/task_run.go:265 +0x1d4b fp=0xc0031abec8 sp=0xc0031abbf0 pc=0x1abfe0b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc006ec2a80, 0x57c9)
	pkg/sentry/kernel/task_run.go:94 +0x36b fp=0xc0031abfb0 sp=0xc0031abec8 pc=0x1abd72b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x48 fp=0xc0031abfe0 sp=0xc0031abfb0 pc=0x1ad1ba8
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0031abfe8 sp=0xc0031abfe0 pc=0x1297a01
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x1ad