panic: What finished? (thread Script#1, at components/script/dom/html/htmllinkelement.rs:901) #42477
Description
This is slightly different from #42259 ; cc @mrobinson cc @TimvdLippe
Minimal testcase:
<!DOCTYPE html>
<link id="link" href="A"></link>
<script>
link.rel = "stylesheet";
link.href = "B";
</script>System: Linux
Version: Version: Servo 0.0.5-7488c127d
Command: ./servo/servo
What finished? (thread Script#1, at components/script/dom/html/htmllinkelement.rs:901)
0: servoshell::backtrace::print
1: servoshell::panic_hook::panic_hook
2: std::panicking::panic_with_hook
3: std::panicking::panic_handler::{{closure}}
4: std::sys::backtrace::__rust_end_short_backtrace
5: __rustc::rust_begin_unwind
6: core::panicking::panic_fmt
7: <script::dom::html::htmllinkelement::HTMLLinkElement as script::stylesheet_loader::StylesheetOwner>::load_finished
8: script::stylesheet_loader::StylesheetContext::do_post_parse_tasks
9: <T as script::task::TaskBox>::run_box
10: script::script_thread::ScriptThread::handle_msg_from_script
11: script::script_thread::ScriptThread::handle_msgs::{{closure}}
12: script::script_thread::ScriptThread::handle_msgs
13: std::sys::backtrace::__rust_begin_short_backtrace
14: core::ops::function::FnOnce::call_once{{vtable.shim}}
15: std::sys::thread::unix::Thread::new::thread_start
16: start_thread
at ./nptl/pthread_create.c:447:8
17: clone3
at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:78:0