panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x6e253f]

goroutine 336 [running]:
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*FSContext).RootDirectory(0x0, 0x0)
	pkg/sentry/kernel/fs_context.go:133 +0x2f
gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc.forEachMountSource(0xc4201c3200, 0xc4205c74d8)
	pkg/sentry/fs/proc/mounts.go:32 +0x47
gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc.(*mountInfoFile).ReadSeqFileData(0xc420140060, 0x0, 0x0, 0xc4205c7570, 0x687326, 0xc420490000, 0xd5)
	pkg/sentry/fs/proc/mounts.go:74 +0x75
gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc/seqfile.(*SeqFile).updateSourceLocked(0xc420252820, 0x0)
	pkg/sentry/fs/proc/seqfile/seqfile.go:225 +0x72
gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc/seqfile.(*SeqFile).DeprecatedPreadv(0xc420252820, 0xc75e00, 0xc420278900, 0xc74b40, 0xc4203f8c80, 0x0, 0x1, 0x200012c0, 0x1000, 0x100, ...)
	pkg/sentry/fs/proc/seqfile/seqfile.go:190 +0x6ed
gvisor.googlesource.com/gvisor/pkg/sentry/fs/fsutil.(*Handle).Read(0xc4201570a0, 0xc75e00, 0xc420278900, 0xc4202e9200, 0xc74b40, 0xc4203f8c80, 0x0, 0x1, 0x200012c0, 0x1000, ...)
	pkg/sentry/fs/fsutil/handle.go:90 +0x8e
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).Preadv(0xc4202e9200, 0xc75e00, 0xc420278900, 0xc74b40, 0xc4203f8c80, 0x0, 0x1, 0x200012c0, 0x1000, 0x100, ...)
	pkg/sentry/fs/file.go:248 +0x117
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.preadv(0xc420278900, 0xc4202e9200, 0xc74b40, 0xc4203f8c80, 0x0, 0x1, 0x200012c0, 0x1000, 0x100, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_read.go:234 +0x9e
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Preadv(0xc420278900, 0x4, 0x200023c0, 0x1, 0x0, 0x65732f636f72702f, 0x65732f636f72702f, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_read.go:185 +0x27b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc420278900, 0x127, 0x4, 0x200023c0, 0x1, 0x0, 0x65732f636f72702f, 0x65732f636f72702f, 0xc42000a1c0, 0xbb6320, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x307
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc420278900, 0x127, 0x4, 0x200023c0, 0x1, 0x0, 0x65732f636f72702f, 0x65732f636f72702f, 0x65732f636f72702f, 0x65732f636f72702f)
	pkg/sentry/kernel/task_syscall.go:278 +0x62
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc420278900, 0x127, 0x4, 0x200023c0, 0x1, 0x0, 0x65732f636f72702f, 0x65732f636f72702f, 0xc69020, 0xc4205c7e00)
	pkg/sentry/kernel/task_syscall.go:241 +0x91
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc420278900, 0x2, 0xc420232480)
	pkg/sentry/kernel/task_syscall.go:216 +0x10c
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc420278900, 0xc69020, 0x0)
	pkg/sentry/kernel/task_run.go:217 +0xed8
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc420278900, 0x20)
	pkg/sentry/kernel/task_run.go:95 +0x174
created by gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:251 +0x100