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=0x7d92de] goroutine 256033 [running]: panic(0x110a640, 0x1cfc750) GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc00949f410 sp=0xc00949f358 pc=0x437030 runtime.panicmem(...) GOROOT/src/runtime/panic.go:212 runtime.sigpanic() GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc00949f440 sp=0xc00949f410 pc=0x44de13 gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0x0, 0x1428fa0, 0xc00d0f2000) pkg/sentry/vfs/file_description.go:169 +0x5e fp=0xc00949f480 sp=0xc00949f440 pc=0x7d92de runtime.call32(0x0, 0x12e3ea0, 0xc0014ea948, 0x1800000018) src/runtime/asm_amd64.s:540 +0x3e fp=0xc00949f4b0 sp=0xc00949f480 pc=0x46ed1e runtime.reflectcallSave(0xc00949f5e0, 0x12e3ea0, 0xc0014ea948, 0xc000000018) GOROOT/src/runtime/panic.go:881 +0x58 fp=0xc00949f4e0 sp=0xc00949f4b0 pc=0x436af8 runtime.runOpenDeferFrame(0xc007a7f200, 0xc0014ea900, 0xc00949f628) GOROOT/src/runtime/panic.go:855 +0x2cd fp=0xc00949f570 sp=0xc00949f4e0 pc=0x4369ad panic(0x110a640, 0x1cfc750) GOROOT/src/runtime/panic.go:969 +0x175 fp=0xc00949f628 sp=0xc00949f570 pc=0x436d35 runtime.panicmem(...) GOROOT/src/runtime/panic.go:212 runtime.sigpanic() GOROOT/src/runtime/signal_unix.go:720 +0x413 fp=0xc00949f658 sp=0xc00949f628 pc=0x44de13 gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Impl(...) pkg/sentry/vfs/file_description.go:347 gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.FilesystemType.GetFilesystem(0x1428fa0, 0xc00d0f2000, 0xc000762408, 0xc000ed4120, 0xc003d59500, 0x0, 0xc003d59700, 0x1a, 0x0, 0x0, ...) pkg/sentry/fsimpl/fuse/fusefs.go:146 +0x437 fp=0xc00949f7e0 sp=0xc00949f658 pc=0xf44017 gvisor.dev/gvisor/pkg/sentry/fsimpl/fuse.(*FilesystemType).GetFilesystem(0x1d434c0, 0x1428fa0, 0xc00d0f2000, 0xc000762408, 0xc000ed4120, 0xc003d59500, 0x0, 0xc003d59700, 0x1a, 0x0, ...) :1 +0xc5 fp=0xc00949f860 sp=0xc00949f7e0 pc=0xf547a5 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountDisconnected(0xc000762408, 0x1428fa0, 0xc00d0f2000, 0xc000ed4120, 0xc003d59500, 0x0, 0xc003d59400, 0x4, 0xc00949fae8, 0x0, ...) pkg/sentry/vfs/mount.go:218 +0x15c fp=0xc00949f930 sp=0xc00949f860 pc=0x7e52bc gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).MountAt(0xc000762408, 0x1428fa0, 0xc00d0f2000, 0xc000ed4120, 0xc003d59500, 0x0, 0xc00949fb18, 0xc003d59400, 0x4, 0xc00949fae8, ...) pkg/sentry/vfs/mount.go:306 +0xde fp=0xc00949f9d0 sp=0xc00949f930 pc=0x7e59fe gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Mount(0xc00d0f2000, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x0, 0x0, ...) pkg/sentry/syscalls/linux/vfs2/mount.go:141 +0x5d4 fp=0xc00949fb90 sp=0xc00949f9d0 pc=0xe5e8b4 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00d0f2000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x0, 0x128ea20, ...) pkg/sentry/kernel/task_syscall.go:116 +0x1b9 fp=0xc00949fc50 sp=0xc00949fb90 pc=0xa4d139 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00d0f2000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0x20000040, 0x0) pkg/sentry/kernel/task_syscall.go:291 +0x70 fp=0xc00949fcd8 sp=0xc00949fc50 pc=0xa4e3f0 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00d0f2000, 0xa5, 0xf0ffff, 0x200020c0, 0x20002100, 0x0, 0x20000040, 0x0, 0xc008e47ea0, 0xc008e47e00) pkg/sentry/kernel/task_syscall.go:238 +0xb4 fp=0xc00949fd38 sp=0xc00949fcd8 pc=0xa4def4 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00d0f2000, 0x2, 0xc00d0f2000) pkg/sentry/kernel/task_syscall.go:205 +0x198 fp=0xc00949fe08 sp=0xc00949fd38 pc=0xa4d7d8 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc00d0f2000, 0x13fb420, 0x0) pkg/sentry/kernel/task_run.go:327 +0xd95 fp=0xc00949ff60 sp=0xc00949fe08 pc=0xa40295 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00d0f2000, 0xf42) pkg/sentry/kernel/task_run.go:100 +0x1e2 fp=0xc00949ffd0 sp=0xc00949ff60 pc=0xa3eda2 runtime.goexit() src/runtime/asm_amd64.s:1374 +0x1 fp=0xc00949ffd8 sp=0xc00949ffd0 pc=0x4705a1 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start pkg/sentry/kernel/task_start.go:374 +0x116