panic: nested locking: kernfs.filesystemRWMutex: goroutine 3406896 [running]: gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*filesystemRWMutex).Lock(0xc0003cb590) bazel-out/k8-fastbuild-ST-3dcbe13c9b87/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:31 +0x45 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc001099b00, {0x82ba18, 0xc00413d500}) pkg/sentry/fsimpl/kernfs/kernfs.go:286 +0x7e gvisor.dev/gvisor/pkg/sentry/vfs.(*Dentry).DecRef(...) pkg/sentry/vfs/dentry.go:155 gvisor.dev/gvisor/pkg/sentry/vfs.VirtualDentry.DecRef({0xc00057b680?, 0xc001099b00?}, {0x82ba18, 0xc00413d500}) pkg/sentry/vfs/vfs.go:1019 +0x78 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).forgetDeadMountpoint(0xc00022c1e0, {0x82ba18, 0xc00413d500}, 0xc001099b00) pkg/sentry/vfs/dentry.go:344 +0x293 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).InvalidateDentry(0xc00066a858?, {0x82ba18, 0xc00413d500}, 0xc001099b00) pkg/sentry/vfs/dentry.go:249 +0x94 gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0x30eae0?, {0x82ba18, 0xc00413d500}, 0x5?, 0xc0002c2f30, {0xc0021f85cb, 0x5}, 0xc001099b00) pkg/sentry/fsimpl/kernfs/filesystem.go:121 +0x15f gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0x12a8879?, {0x82ba18, 0xc00413d500}, 0xc001b3b680, 0xc0002c2f30) pkg/sentry/fsimpl/kernfs/filesystem.go:75 +0x3ea gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc0003cb590?, {0x82ba18, 0xc00413d500}, 0xc001b3b680) pkg/sentry/fsimpl/kernfs/filesystem.go:160 +0xdf gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).OpenAt(0xc0003cb540, {0x82ba18, 0xc00413d500}, 0xc001b3b680, {0x8001, 0x0, 0x0}) pkg/sentry/fsimpl/kernfs/filesystem.go:483 +0x1c5 gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).OpenAt(0xc00941b440?, {0x82ba18, 0xc00413d500}, 0xc000028900?, 0xc00103f370, 0xc00103f268) pkg/sentry/vfs/vfs.go:460 +0x517 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.openat(0xc00413d500, 0x1?, 0x12d2f45?, 0x80001, 0x0) pkg/sentry/syscalls/linux/sys_file.go:112 +0x2b2 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Openat(0xc00103f4c0?, 0x12d1359?, {{0xffffff9c}, {0x5637db4dad29}, {0x80001}, {0x0}, {0x0}, {0x7f0c49e1c030}}) pkg/sentry/syscalls/linux/sys_file.go:91 +0x45 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc00413d500, 0x101, {{0xffffff9c}, {0x5637db4dad29}, {0x80001}, {0x0}, {0x0}, {0x7f0c49e1c030}}) pkg/sentry/kernel/task_syscall.go:142 +0x9c2 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc00413d500, 0x0?, {{0xffffff9c}, {0x5637db4dad29}, {0x80001}, {0x0}, {0x0}, {0x7f0c49e1c030}}) pkg/sentry/kernel/task_syscall.go:322 +0x7d gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc007cf6820?, 0xc00730e0f0?, {{0xffffff9c}, {0x5637db4dad29}, {0x80001}, {0x0}, {0x0}, {0x7f0c49e1c030}}) pkg/sentry/kernel/task_syscall.go:282 +0x8f gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc00413d500) pkg/sentry/kernel/task_syscall.go:257 +0x4c5 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc00413d500?, 0xc00413d500) pkg/sentry/kernel/task_run.go:269 +0x1d4b gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc00413d500, 0xa738) pkg/sentry/kernel/task_run.go:98 +0x41b created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start pkg/sentry/kernel/task_start.go:377 +0x1ad