panic: runtime error: invalid memory address or nil pointer dereference panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x9f50c2] goroutine 1266 [running]: panic(0x173e340, 0x22aa3c0) GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc0004eae88 sp=0xc0004eadd0 pc=0x439090 runtime.panicmem(...) GOROOT/src/runtime/panic.go:212 runtime.sigpanic() GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc0004eaeb8 sp=0xc0004eae88 pc=0x451553 gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x1ab6000, 0xc000896a80) pkg/sentry/vfs/file_description.go:163 +0x62 fp=0xc0004eaef8 sp=0xc0004eaeb8 pc=0x9f50c2 runtime.call32(0x0, 0x190f408, 0xc0004eb110, 0x1800000018) src/runtime/asm_amd64.s:540 +0x3e fp=0xc0004eaf28 sp=0xc0004eaef8 pc=0x472bbe panic(0x173e340, 0x22aa3c0) GOROOT/src/runtime/panic.go:975 +0x3e9 fp=0xc0004eafe0 sp=0xc0004eaf28 pc=0x439009 runtime.panicmem(...) GOROOT/src/runtime/panic.go:212 runtime.sigpanic() GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc0004eb010 sp=0xc0004eafe0 pc=0x451553 gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Impl(...) pkg/sentry/vfs/file_description.go:300 gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.FilesystemType.GetFilesystem(0x1ab6000, 0xc000896a80, 0xc0002b3588, 0xc0005decc0, 0xc00018d500, 0x0, 0xc00018d800, 0x1a, 0x0, 0x0, ...) pkg/sentry/fsimpl/fuse/fusefs.go:133 +0x579 fp=0xc0004eb248 sp=0xc0004eb010 pc=0x1441f39 gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x2d32c10, 0x1ab6000, 0xc000896a80, 0xc0002b3588, 0xc0005decc0, 0xc00018d500, 0x0, 0xc00018d800, 0x1a, 0x0, ...) :1 +0xe5 fp=0xc0004eb2e8 sp=0xc0004eb248 pc=0x1458445 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc0002b3588, 0x1ab6000, 0xc000896a80, 0xc0005decc0, 0xc00018d500, 0x0, 0xc00018d400, 0x4, 0xc0004eb6a0, 0x0, ...) pkg/sentry/vfs/mount.go:200 +0x1a2 fp=0xc0004eb458 sp=0xc0004eb2e8 pc=0xa051a2 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc0002b3588, 0x1ab6000, 0xc000896a80, 0xc0005decc0, 0xc00018d500, 0x0, 0xc0004eb6d0, 0xc00018d400, 0x4, 0xc0004eb6a0, ...) pkg/sentry/vfs/mount.go:272 +0xd5 fp=0xc0004eb530 sp=0xc0004eb458 pc=0xa059d5 gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc000896a80, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...) pkg/sentry/syscalls/linux/vfs2/mount.go:112 +0x4f4 fp=0xc0004eb730 sp=0xc0004eb530 pc=0x1301614 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000896a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, ...) pkg/sentry/kernel/task_syscall.go:104 +0x453 fp=0xc0004eb9d0 sp=0xc0004eb730 pc=0xd68913 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000896a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x408638, 0xc00089735f) pkg/sentry/kernel/task_syscall.go:239 +0xba fp=0xc0004ebab0 sp=0xc0004eb9d0 pc=0xd6a09a gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000896a80, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x138236b, 0x2d326d4) pkg/sentry/kernel/task_syscall.go:199 +0x10f fp=0xc0004ebb60 sp=0xc0004ebab0 pc=0xd699af gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000896a80, 0x2, 0xc000896a80) pkg/sentry/kernel/task_syscall.go:174 +0x1ea fp=0xc0004ebca0 sp=0xc0004ebb60 pc=0xd6914a gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000896a80, 0x1a87b00, 0x0) pkg/sentry/kernel/task_run.go:282 +0x12a7 fp=0xc0004ebed8 sp=0xc0004ebca0 pc=0xd54ac7 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000896a80, 0x1e) pkg/sentry/kernel/task_run.go:97 +0x398 fp=0xc0004ebfd0 sp=0xc0004ebed8 pc=0xd52bf8 runtime.goexit() src/runtime/asm_amd64.s:1374 +0x1 fp=0xc0004ebfd8 sp=0xc0004ebfd0 pc=0x4745e1 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start pkg/sentry/kernel/task_start.go:323 +0x1a5