panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x94b45d]

goroutine 124 [running]:
panic({0x10ec220, 0x1e67c20})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0007b8f28 sp=0xc0007b8e68 pc=0x436c1b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc0007b8f88 sp=0xc0007b8f28 pc=0x44e23d
gvisor.dev/gvisor/pkg/sentry/kernel.(*TTY).SignalForegroundProcessGroup(0x1ec6308?, 0xc000720000?)
	pkg/sentry/kernel/tty.go:54 +0x9d fp=0xc0007b9018 sp=0xc0007b8f88 pc=0x94b45d
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x0, 0xc0002cc180, 0xc0002cc190, {0xc000720000?, 0xc000748010?, 0x0?})
	pkg/sentry/fsimpl/devpts/line_discipline.go:407 +0x34e fp=0xc0007b9240 sp=0xc0007b9018 pc=0xc896ae
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc0002cc190, 0xc0003f2000?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x99 fp=0xc0007b92a8 sp=0xc0007b9240 pc=0xc8bf99
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).read(0xc0002cc190, {0x14c8e18, 0xc0003fe000}, {{0x14c30d0, 0xc0003f2000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/queue.go:140 +0x3ba fp=0xc0007b9430 sp=0xc0007b92a8 pc=0xc8b49a
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).inputQueueRead(0xc0002cc180, {0x14c8e18?, 0xc0003fe000?}, {{0x14c30d0, 0xc0003f2000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:197 +0xbf fp=0xc0007b94b8 sp=0xc0007b9430 pc=0xc8861f
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*replicaFileDescription).Read(0x0?, {0x14c8e18?, 0xc0003fe000?}, {{0x14c30d0, 0xc0003f2000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/replica.go:142 +0x65 fp=0xc0007b9518 sp=0xc0007b94b8 pc=0xc8c945
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Read(0xc000176480, {0x14c8e18, 0xc0003fe000}, {{0x14c30d0, 0xc0003f2000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/vfs/file_description.go:643 +0xf5 fp=0xc0007b95b8 sp=0xc0007b9518 pc=0x73f715
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.read(0x9?, 0xc000176480, {{0x14c30d0, 0xc0003f2000}, {0x0, 0x0, 0x0, 0x0}, {0x0, 0x1}}, ...)
	pkg/sentry/syscalls/linux/sys_read_write.go:93 +0x85 fp=0xc0007b9778 sp=0xc0007b95b8 pc=0xa838a5
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readv(0xc0003fe000, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/syscalls/linux/sys_read_write.go:87 +0x1b4 fp=0xc0007b9880 sp=0xc0007b9778 pc=0xa835f4
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0003fe000, 0x13, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x755 fp=0xc0007b9c70 sp=0xc0007b9880 pc=0x942635
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0003fe000, 0x85?, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4a fp=0xc0007b9cd0 sp=0xc0007b9c70 pc=0x94386a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0003f2878?, 0x0?, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x65 fp=0xc0007b9d30 sp=0xc0007b9cd0 pc=0x943545
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000457450?)
	pkg/sentry/kernel/task_syscall.go:257 +0x2f0 fp=0xc0007b9e28 sp=0xc0007b9d30 pc=0x9432b0
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000176380?, 0xc0003fe000)
	pkg/sentry/kernel/task_run.go:265 +0x103e fp=0xc0007b9f60 sp=0xc0007b9e28 pc=0x9374de
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0003fe000, 0x8)
	pkg/sentry/kernel/task_run.go:94 +0x1b8 fp=0xc0007b9fc0 sp=0xc0007b9f60 pc=0x935e78
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x2a fp=0xc0007b9fe0 sp=0xc0007b9fc0 pc=0x940e2a
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0007b9fe8 sp=0xc0007b9fe0 pc=0x46d5e1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0xef