panic: nested locking: kernfs.filesystemRWMutex:
goroutine 7417 [running]:
gvisor.dev/gvisor/pkg/log.Stacks(0x40?)
	pkg/log/log.go:318 +0x8d
gvisor.dev/gvisor/pkg/sync/locking.AddGLock(0xc0001bd400, 0x0)
	pkg/sync/locking/lockdep.go:105 +0x4dd
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*filesystemRWMutex).Lock(0xc0001c2230)
	bazel-out/k8-fastbuild-ST-3dcbe13c9b87/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:18 +0x3f
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc000a37320, {0x1bd2c70, 0xc0022c0a80})
	pkg/sentry/fsimpl/kernfs/kernfs.go:282 +0x79
gvisor.dev/gvisor/pkg/sentry/vfs.(*Dentry).DecRef(...)
	pkg/sentry/vfs/dentry.go:161
gvisor.dev/gvisor/pkg/sentry/vfs.VirtualDentry.DecRef({0xc000310600?, 0xc000a37320?}, {0x1bd2c70, 0xc0022c0a80})
	pkg/sentry/vfs/vfs.go:914 +0x75
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef.func1()
	pkg/sentry/vfs/file_description.go:196 +0x394
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescriptionRefs).DecRef(0xc0013598c0, 0xc00073a908)
	bazel-out/k8-fastbuild-ST-3dcbe13c9b87/bin/pkg/sentry/vfs/file_description_refs.go:131 +0x5f
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0xc0013598c0, {0x1bd2c70, 0xc0022c0a80})
	pkg/sentry/vfs/file_description.go:161 +0x6f
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).SafeDecRefFD(0xc0001c25a0, {0x1bd2c70, 0xc0022c0a80}, 0xc0013598c0)
	pkg/sentry/fsimpl/kernfs/kernfs.go:153 +0xb3
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.taskFDExists({0x1bd2c70, 0xc0022c0a80}, 0xc0001c25a0, 0x20?, 0x470e97?)
	pkg/sentry/fsimpl/proc/task_fds.go:50 +0x69
gvisor.dev/gvisor/pkg/sentry/fsimpl/proc.(*fdDirInode).Lookup(0xc0021f6a80, {0x1bd2c70, 0xc0022c0a80}, {0xc000cfca0e, 0x1})
	pkg/sentry/fsimpl/proc/task_fds.go:148 +0xe5
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).revalidateChildLocked(0x16de680?, {0x1bd2c70, 0xc0022c0a80}, 0x1?, 0xc000527830, {0xc000cfca0e, 0x1}, 0x0)
	pkg/sentry/fsimpl/kernfs/filesystem.go:134 +0x1b5
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).stepExistingLocked(0xc00073ac18?, {0x1bd2c70, 0xc0022c0a80}, 0xc00144f200, 0xc000527830, 0x1)
	pkg/sentry/fsimpl/kernfs/filesystem.go:76 +0x2ae
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).walkExistingLocked(0xc0001c25f0?, {0x1bd2c70, 0xc0022c0a80}, 0xc00144f200)
	pkg/sentry/fsimpl/kernfs/filesystem.go:166 +0xd9
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Filesystem).OpenAt(0xc0001c25a0, {0x1bd2c70, 0xc0022c0a80}, 0xc00144f200, {0x0, 0x0, 0x0})
	pkg/sentry/fsimpl/kernfs/filesystem.go:490 +0x1cd
gvisor.dev/gvisor/pkg/sentry/vfs.(*VirtualFilesystem).OpenAt(0xc001df8690?, {0x1bd2c70, 0xc0022c0a80}, 0xc0003e7b00?, 0xc00073b3e8, 0xc001d372e0)
	pkg/sentry/vfs/vfs.go:428 +0x4ef
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.openat(0xc0022c0a80, 0x0?, 0x470ec5?, 0x0, 0x0)
	pkg/sentry/syscalls/linux/vfs2/filesystem.go:179 +0x2aa
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Openat(0xc0005ba050?, {{0xffffff9c}, {0x7f3d591791f0}, {0x0}, {0x0}, {0x0}, {0x7f3d59179080}})
	pkg/sentry/syscalls/linux/vfs2/filesystem.go:158 +0x45
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0022c0a80, 0x101, {{0xffffff9c}, {0x7f3d591791f0}, {0x0}, {0x0}, {0x0}, {0x7f3d59179080}})
	pkg/sentry/kernel/task_syscall.go:142 +0xa78
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0022c0a80, 0x0?, {{0xffffff9c}, {0x7f3d591791f0}, {0x0}, {0x0}, {0x0}, {0x7f3d59179080}})
	pkg/sentry/kernel/task_syscall.go:322 +0x7d
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc00057c340?, 0xc00037dc20?, {{0xffffff9c}, {0x7f3d591791f0}, {0x0}, {0x0}, {0x0}, {0x7f3d59179080}})
	pkg/sentry/kernel/task_syscall.go:282 +0x8f
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0022c0a80)
	pkg/sentry/kernel/task_syscall.go:257 +0x496
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc0022c0a80?, 0xc0022c0a80)
	pkg/sentry/kernel/task_run.go:253 +0x18f9
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0022c0a80, 0x1f4)
	pkg/sentry/kernel/task_run.go:94 +0x354
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:370 +0x1a8