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

goroutine 114207 [running]:
panic({0x11ee280, 0x210cda0})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000d5efb0 sp=0xc000d5eef0 pc=0x436a3b
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000d5f010 sp=0xc000d5efb0 pc=0x44e05d
gvisor.dev/gvisor/pkg/sentry/kernel.(*TTY).SignalForegroundProcessGroup(0xc0044ddaa0, 0xc005d48105?)
	pkg/sentry/kernel/tty.go:54 +0xa1 fp=0xc000d5f0a0 sp=0xc000d5f010 pc=0x9d6041
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0x6bdb1a, 0xc00041c300, 0xc00041c310, {0xc005d48000?, 0xc0055ca000?, 0x0?})
	pkg/sentry/fsimpl/devpts/line_discipline.go:409 +0x3c6 fp=0xc000d5f2d0 sp=0xc000d5f0a0 pc=0xd6e366
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc00041c310, 0xc0055ca000?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0xce fp=0xc000d5f338 sp=0xc000d5f2d0 pc=0xd7130e
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).read(0xc00041c310, {0x15f5f58, 0xc0055ca000}, {{0x15f0490, 0xc005910000}, {0x0, 0x1, 0x200000c0, 0xe3}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/queue.go:140 +0x3c5 fp=0xc000d5f490 sp=0xc000d5f338 pc=0xd70685
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).inputQueueRead(0xc00041c300, {0x15f5f58, 0xc0055ca000}, {{0x15f0490, 0xc005910000}, {0x0, 0x1, 0x200000c0, 0xe3}, {0x0, ...}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:197 +0xcd fp=0xc000d5f520 sp=0xc000d5f490 pc=0xd6cf8d
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*replicaFileDescription).Read(0x0?, {0x15f5f58?, 0xc0055ca000?}, {{0x15f0490, 0xc005910000}, {0x0, 0x1, 0x200000c0, 0xe3}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/replica.go:142 +0x6c fp=0xc000d5f580 sp=0xc000d5f520 pc=0xd71e2c
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Read(0xc000f4c100, {0x15f5f58, 0xc0055ca000}, {{0x15f0490, 0xc005910000}, {0x0, 0x1, 0x200000c0, 0xe3}, {0x0, ...}}, ...)
	pkg/sentry/vfs/file_description.go:643 +0xea fp=0xc000d5f620 sp=0xc000d5f580 pc=0x7734ea
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.read(0xc005b86000?, 0xc000f4c100, {{0x15f0490, 0xc005910000}, {0x0, 0x1, 0x200000c0, 0xe3}, {0x0, 0x1}}, ...)
	pkg/sentry/syscalls/linux/sys_read_write.go:93 +0x8e fp=0xc000d5f7f0 sp=0xc000d5f620 pc=0xb3eb4e
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readv(0xc0055ca000, {{0x5}, {0x20000000}, {0x1}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/syscalls/linux/sys_read_write.go:87 +0x23e fp=0xc000d5f930 sp=0xc000d5f7f0 pc=0xb3e83e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0055ca000, 0x13, {{0x5}, {0x20000000}, {0x1}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x80b fp=0xc000d5fc70 sp=0xc000d5f930 pc=0x9cb66b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0055ca000, 0x85?, {{0x5}, {0x20000000}, {0x1}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x54 fp=0xc000d5fcd0 sp=0xc000d5fc70 pc=0x9ccc54
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000d5fd78?, 0x9829e6?, {{0x5}, {0x20000000}, {0x1}, {0x0}, {0x0}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x85 fp=0xc000d5fd30 sp=0xc000d5fcd0 pc=0x9cc845
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00526cc30?)
	pkg/sentry/kernel/task_syscall.go:257 +0x3ac fp=0xc000d5fe28 sp=0xc000d5fd30 pc=0x9cc50c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc001de9f80?, 0xc0055ca000)
	pkg/sentry/kernel/task_run.go:265 +0x144a fp=0xc000d5ff60 sp=0xc000d5fe28 pc=0x9be14a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0055ca000, 0xcd1)
	pkg/sentry/kernel/task_run.go:94 +0x21c fp=0xc000d5ffc0 sp=0xc000d5ff60 pc=0x9bc65c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x2a fp=0xc000d5ffe0 sp=0xc000d5ffc0 pc=0x9c9aea
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000d5ffe8 sp=0xc000d5ffe0 pc=0x46d401
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x105