panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x9d6041]

goroutine 76 [running]:
panic({0x11ee280, 0x210cda0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc0003aafb0 sp=0xc0003aaef0 pc=0x436a3b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc0003ab010 sp=0xc0003aafb0 pc=0x44e05d
gvisor.dev/gvisor/pkg/sentry/kernel.(*TTY).SignalForegroundProcessGroup(0xc0000109d8, 0xc0006b0000?)
	pkg/sentry/kernel/tty.go:54 +0xa1 fp=0xc0003ab0a0 sp=0xc0003ab010 pc=0x9d6041
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x6bdb1a, 0xc000456180, 0xc000456190, {0xc0006b0000?, 0xc000912a80?, 0x0?})
	pkg/sentry/fsimpl/devpts/line_discipline.go:407 +0x445 fp=0xc0003ab2d0 sp=0xc0003ab0a0 pc=0xd6e3e5
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc000456190, 0xc000912a80?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0xce fp=0xc0003ab338 sp=0xc0003ab2d0 pc=0xd7130e
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).read(0xc000456190, {0x15f5f58, 0xc000912a80}, {{0x15f0490, 0xc000540000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/queue.go:140 +0x3c5 fp=0xc0003ab490 sp=0xc0003ab338 pc=0xd70685
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).inputQueueRead(0xc000456180, {0x15f5f58, 0xc000912a80}, {{0x15f0490, 0xc000540000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:197 +0xcd fp=0xc0003ab520 sp=0xc0003ab490 pc=0xd6cf8d
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*replicaFileDescription).Read(0x0?, {0x15f5f58?, 0xc000912a80?}, {{0x15f0490, 0xc000540000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/replica.go:142 +0x6c fp=0xc0003ab580 sp=0xc0003ab520 pc=0xd71e2c
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Read(0xc0005e0780, {0x15f5f58, 0xc000912a80}, {{0x15f0490, 0xc000540000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/vfs/file_description.go:643 +0xea fp=0xc0003ab620 sp=0xc0003ab580 pc=0x7734ea
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.read(0x15f5f58?, 0xc0005e0780, {{0x15f0490, 0xc000540000}, {0x0, 0x0, 0x0, 0x0}, {0x0, 0x1}}, ...)
	pkg/sentry/syscalls/linux/sys_read_write.go:93 +0x8e fp=0xc0003ab7f0 sp=0xc0003ab620 pc=0xb3eb4e
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readv(0xc000912a80, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/syscalls/linux/sys_read_write.go:87 +0x23e fp=0xc0003ab930 sp=0xc0003ab7f0 pc=0xb3e83e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000912a80, 0x13, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc0003abc70 sp=0xc0003ab930 pc=0x9cb66b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000912a80, 0x85?, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x54 fp=0xc0003abcd0 sp=0xc0003abc70 pc=0x9ccc54
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0x8415cf?, 0x0?, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x85 fp=0xc0003abd30 sp=0xc0003abcd0 pc=0x9cc845
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0006f8340?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3ac fp=0xc0003abe28 sp=0xc0003abd30 pc=0x9cc50c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000812080?, 0xc000912a80)
	pkg/sentry/kernel/task_run.go:265 +0x144a fp=0xc0003abf60 sp=0xc0003abe28 pc=0x9be14a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000912a80, 0x7)
	pkg/sentry/kernel/task_run.go:94 +0x21c fp=0xc0003abfc0 sp=0xc0003abf60 pc=0x9bc65c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x2a fp=0xc0003abfe0 sp=0xc0003abfc0 pc=0x9c9aea
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc0003abfe8 sp=0xc0003abfe0 pc=0x46d401
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x105