assertion failed: !self.loader.borrow().events_inhibited()

[mateon1]

<script>
setTimeout(function() {
  document.body.replaceWith(document.body);
  document.write();
});
</script>
<iframe>

assertion failed: !self.loader.borrow().events_inhibited() (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(0), index: PipelineIndex(NonZeroU32(NonZero(1))) }, at /shared/dev/rust/servo/components/script/dom/document.rs:1689)
stack backtrace:
   0:     0x55be1017d4a4 - backtrace::backtrace::trace<closure>
                        at /shared/dev/rust/servo/./.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/backtrace/libunwind.rs:53
   1:     0x55be1017b17f - backtrace::capture::{{impl}}::new
                        at /shared/dev/rust/servo/./.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.2/src/capture.rs:64
   2:     0x55be09e0acbe - servo::main::{{closure}}
                        at /shared/dev/rust/servo/ports/servo/main.rs:130
   3:     0x55be10272756 - std::panicking::rust_panic_with_hook
                        at /checkout/src/libstd/panicking.rs:578
   4:     0x55be0b0cbc15 - std::panicking::begin_panic<&str>
                        at /checkout/src/libstd/panicking.rs:538
   5:     0x55be0abd6de8 - script::dom::document::{{impl}}::maybe_queue_document_completion
                        at /shared/dev/rust/servo/components/script/dom/document.rs:1689
   6:     0x55be0ae8f3bc - script::script_thread::{{impl}}::handle_msgs
                        at /shared/dev/rust/servo/components/script/script_thread.rs:1078
   7:     0x55be0ae8d1d5 - script::script_thread::{{impl}}::start
                        at /shared/dev/rust/servo/components/script/script_thread.rs:885
   8:     0x55be0aeab914 - script::script_thread::{{impl}}::create::{{closure}}::{{closure}}
                        at /shared/dev/rust/servo/components/script/script_thread.rs:570
   9:     0x55be0c3a7447 - profile_traits::mem::{{impl}}::run_with_memory_reporting<closure,fn(profile_traits::mem::ReportsChan) -> script::script_runtime::CommonScriptMsg,script::script_runtime::CommonScriptMsg,std::sync::mpsc::Sender<script::script_thread::MainThreadScriptMsg>>
                        at /shared/dev/rust/servo/components/profile_traits/mem.rs:63
  10:     0x55be0aeabee6 - script::script_thread::{{impl}}::create::{{closure}}
                        at /shared/dev/rust/servo/components/script/script_thread.rs:569
  11:     0x55be0cdf6f2a - std::sys_common::backtrace::__rust_begin_short_backtrace<closure,()>
                        at /checkout/src/libstd/sys_common/backtrace.rs:134
  12:     0x55be0b63b913 - std::thread::{{impl}}::spawn::{{closure}}::{{closure}}<closure,()>
                        at /checkout/src/libstd/thread/mod.rs:400
  13:     0x55be0cb84efa - std::panic::{{impl}}::call_once<(),closure>
                        at /checkout/src/libstd/panic.rs:296
  14:     0x55be0b298652 - std::panicking::try::do_call<std::panic::AssertUnwindSafe<closure>,()>
                        at /checkout/src/libstd/panicking.rs:480
  15:     0x55be1027989c - panic_unwind::__rust_maybe_catch_panic
                        at /checkout/src/libpanic_unwind/lib.rs:99
  16:     0x55be0b1f5b5c - std::panicking::try<(),std::panic::AssertUnwindSafe<closure>>
                        at /checkout/src/libstd/panicking.rs:459
  17:     0x55be0cc65265 - std::panic::catch_unwind<std::panic::AssertUnwindSafe<closure>,()>
                        at /checkout/src/libstd/panic.rs:361
  18:     0x55be0b63a90b - std::thread::{{impl}}::spawn::{{closure}}<closure,()>
                        at /checkout/src/libstd/thread/mod.rs:399
  19:     0x55be0b63bf93 - alloc::boxed::{{impl}}::call_box<(),closure>
                        at /checkout/src/liballoc/boxed.rs:762
  20:     0x55be1027146b - alloc::boxed::{{impl}}::call_once<(),()>
                        at /checkout/src/liballoc/boxed.rs:772
                         - std::sys_common::thread::start_thread
                        at /checkout/src/libstd/sys_common/thread.rs:24
                         - std::sys::imp::thread::{{impl}}::new::thread_start
                        at /checkout/src/libstd/sys/unix/thread.rs:90
  21:     0x7f27808e2493 - start_thread
  22:     0x7f278040fabe - __clone
  23:                0x0 - <unknown>
ERROR:servo: assertion failed: !self.loader.borrow().events_inhibited()

[stack trace slightly outdated, sorry]

/cc @nox

[mateon1]

This panic can be triggered even more directly with this testcase:

<iframe></iframe>
<script>window.stop();</script>

The stack trace is nearly identical, even on latest Servo.

[dralley]

This still happens.