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

goroutine 127 [running]:
panic({0x319320, 0x26ce990})
	GOROOT/src/runtime/panic.go:987 +0x3bb fp=0xc000aa89e8 sp=0xc000aa8928 pc=0x11b33fb
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:260
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:837 +0x37d fp=0xc000aa8a48 sp=0xc000aa89e8 pc=0x11cc2bd
gvisor.dev/gvisor/pkg/sentry/kernel.(*ProcessGroup).SendSignal(0x0, 0xc000aa8cf8)
	pkg/sentry/kernel/sessions.go:237 +0x6d fp=0xc000aa8b80 sp=0xc000aa8a48 pc=0x1a90c6d
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*inputQueueTransformer).transform(0xc0004f4130, 0xc00030c000, 0xc00030c010, {0xc000752000, 0x20000, 0x20000})
	pkg/sentry/fsimpl/devpts/line_discipline.go:400 +0x585 fp=0xc000aa8dd0 sp=0xc000aa8b80 pc=0x2075d65
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).pushWaitBufLocked(0xc00030c010, 0xc000924000?)
	pkg/sentry/fsimpl/devpts/queue.go:219 +0x1e2 fp=0xc000aa8e80 sp=0xc000aa8dd0 pc=0x207a762
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*queue).read(0xc00030c010, {0x742e58, 0xc000924000}, {{0x73d390, 0xc00074e000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/queue.go:140 +0x507 fp=0xc000aa9078 sp=0xc000aa8e80 pc=0x2079487
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*lineDiscipline).inputQueueRead(0xc00030c000, {0x742e58, 0xc000924000}, {{0x73d390, 0xc00074e000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}})
	pkg/sentry/fsimpl/devpts/line_discipline.go:194 +0xd7 fp=0xc000aa9110 sp=0xc000aa9078 pc=0x2074077
gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts.(*replicaFileDescription).Read(0xc00069e100, {0x742e58, 0xc000924000}, {{0x73d390, 0xc00074e000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/fsimpl/devpts/replica.go:138 +0xf7 fp=0xc000aa9198 sp=0xc000aa9110 pc=0x207bab7
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Read(0xc00069e100, {0x742e58, 0xc000924000}, {{0x73d390, 0xc00074e000}, {0x0, 0x0, 0x0, 0x0}, {0x0, ...}}, ...)
	pkg/sentry/vfs/file_description.go:643 +0x16b fp=0xc000aa9278 sp=0xc000aa9198 pc=0x172954b
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.read(0x0?, 0x1ce4740?, {{0x73d390, 0xc00074e000}, {0x0, 0x0, 0x0, 0x0}, {0x0, 0x1}}, ...)
	pkg/sentry/syscalls/linux/sys_read_write.go:93 +0xae fp=0xc000aa9408 sp=0xc000aa9278 pc=0x1d1050e
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Readv(0xc000924000, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/syscalls/linux/sys_read_write.go:87 +0x32f fp=0xc000aa95a8 sp=0xc000aa9408 pc=0x1d1016f
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000924000, 0x13, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0xab7 fp=0xc000aa99c0 sp=0xc000aa95a8 pc=0x1ad8477
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000924000, 0x1?, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x8e fp=0xc000aa9a60 sp=0xc000aa99c0 pc=0x1ada58e
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000a582d0?, 0xc000aa9b8f?, {{0x4}, {0x0}, {0x0}, {0x0}, {0xa}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0xc5 fp=0xc000aa9ad8 sp=0xc000aa9a60 pc=0x1ad9e85
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000924000)
	pkg/sentry/kernel/task_syscall.go:257 +0x53b fp=0xc000aa9c00 sp=0xc000aa9ad8 pc=0x1ad999b
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000924000?, 0xc000924000)
	pkg/sentry/kernel/task_run.go:265 +0x22b4 fp=0xc000aa9ec0 sp=0xc000aa9c00 pc=0x1ac2714
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000924000, 0xd)
	pkg/sentry/kernel/task_run.go:94 +0x2cc fp=0xc000aa9fb0 sp=0xc000aa9ec0 pc=0x1abfa8c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:377 +0x48 fp=0xc000aa9fe0 sp=0xc000aa9fb0 pc=0x1ad5b68
runtime.goexit()
	src/runtime/asm_amd64.s:1598 +0x1 fp=0xc000aa9fe8 sp=0xc000aa9fe0 pc=0x11ec2a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:377 +0x1da