syzbot

panic: nested locking: kernfs.filesystemRWMutex:
	goroutine 606 [running]:
	gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*filesystemRWMutex).Lock(0xc0011ee710)
		bazel-out/k8-fastbuild/bin/pkg/sentry/fsimpl/kernfs/filesystem_mutex.go:31 +0x4d
	gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*Dentry).DecRef(0xc000b8f050, {0x20f3bb0, 0xc001498588})
		pkg/sentry/fsimpl/kernfs/kernfs.go:303 +0x116
	gvisor.dev/gvisor/pkg/sentry/vfs.(*Dentry).DecRef(0xc000b8f050, {0x20f3bb0, 0xc001498588})
		pkg/sentry/vfs/dentry.go:156 +0x68
	gvisor.dev/gvisor/pkg/sentry/vfs.VirtualDentry.DecRef({0xc0006251e0?, 0xc000b8f050?}, {0x20f3bb0, 0xc001498588})
		pkg/sentry/vfs/vfs.go:1105 +0x5b
	gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef.func1()
		pkg/sentry/vfs/file_description.go:201 +0x505
	gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescriptionRefs).DecRef(0xc000934b88, 0xc000e97b80)
		bazel-out/k8-fastbuild/bin/pkg/sentry/vfs/file_description_refs.go:133 +0xb4
	gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).DecRef(0xc000934b88, {0x20f3bb0, 0xc001498588})
		pkg/sentry/vfs/file_description.go:161 +0xa5
	gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTable).RemoveIf(0xc00070e440, {0x20f3bb0, 0xc001498588}, 0x1f36640)
		pkg/sentry/kernel/fd_table.go:506 +0x1b3
	gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTable).DecRef.func1()
		pkg/sentry/kernel/fd_table.go:150 +0x65
	gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTableRefs).DecRef(0xc00070e440, 0xc000e97d10)
		bazel-out/k8-fastbuild/bin/pkg/sentry/kernel/fd_table_refs.go:133 +0xb4
	gvisor.dev/gvisor/pkg/sentry/kernel.(*FDTable).DecRef(0xc00070e440, {0x20f3bb0, 0xc001498588})
		pkg/sentry/kernel/fd_table.go:149 +0xa5
	gvisor.dev/gvisor/pkg/sentry/kernel.(*runExitMain).execute(0xc001498588?, 0xc001498588)
		pkg/sentry/kernel/task_exit.go:301 +0x813
	gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc001498588, 0x4f)
		pkg/sentry/kernel/task_run.go:97 +0x402
	created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 638
		pkg/sentry/kernel/task_start.go:412 +0x17e