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

goroutine 279 [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(0xc420547b00, 0xc42061b4d8)
	pkg/sentry/fs/proc/mounts.go:32 +0x47
gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc.(*mountInfoFile).ReadSeqFileData(0xc420572030, 0x0, 0x0, 0xc420131710, 0xc42061b548, 0x5dc15e, 0xc420131710)
	pkg/sentry/fs/proc/mounts.go:74 +0x75
gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc/seqfile.(*SeqFile).updateSourceLocked(0xc420bb0320, 0x0)
	pkg/sentry/fs/proc/seqfile/seqfile.go:225 +0x72
gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc/seqfile.(*SeqFile).DeprecatedPreadv(0xc420bb0320, 0xc75e00, 0xc420c0a000, 0xc74b40, 0xc420740c80, 0x0, 0x1, 0x200012c0, 0x1000, 0x100, ...)
	pkg/sentry/fs/proc/seqfile/seqfile.go:158 +0x78f
gvisor.googlesource.com/gvisor/pkg/sentry/fs/fsutil.(*Handle).Read(0xc420bb4480, 0xc75e00, 0xc420c0a000, 0xc420468900, 0xc74b40, 0xc420740c80, 0x0, 0x1, 0x200012c0, 0x1000, ...)
	pkg/sentry/fs/fsutil/handle.go:90 +0x8e
gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).Preadv(0xc420468900, 0xc75e00, 0xc420c0a000, 0xc74b40, 0xc420740c80, 0x0, 0x1, 0x200012c0, 0x1000, 0x100, ...)
	pkg/sentry/fs/file.go:248 +0x117
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.preadv(0xc420c0a000, 0xc420468900, 0xc74b40, 0xc420740c80, 0x0, 0x1, 0x200012c0, 0x1000, 0x100, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_read.go:234 +0x9e
gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Preadv(0xc420c0a000, 0x3, 0x200023c0, 0x1, 0x0, 0x2b14761f9700, 0x0, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/sys_read.go:185 +0x27b
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc420c0a000, 0x127, 0x3, 0x200023c0, 0x1, 0x0, 0x2b14761f9700, 0x0, 0xc420a1c4a8, 0xbb6320, ...)
	pkg/sentry/kernel/task_syscall.go:162 +0x307
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc420c0a000, 0x127, 0x3, 0x200023c0, 0x1, 0x0, 0x2b14761f9700, 0x0, 0x2b14761f9700, 0x0)
	pkg/sentry/kernel/task_syscall.go:278 +0x62
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc420c0a000, 0x127, 0x3, 0x200023c0, 0x1, 0x0, 0x2b14761f9700, 0x0, 0xc4205fe800, 0xc420a1c600)
	pkg/sentry/kernel/task_syscall.go:241 +0x91
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc420c0a000, 0x2, 0xc4208de480)
	pkg/sentry/kernel/task_syscall.go:216 +0x10c
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc420c0a000, 0xc69020, 0x0)
	pkg/sentry/kernel/task_run.go:217 +0xed8
gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run(0xc420c0a000, 0x11)
	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