panic: assertion failed: *progress >= n (thread Script#1, at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/servo/animation.rs:619) #46335

assertion failed: *progress >= n (thread Script#1, at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/servo/animation.rs:619)
   0: servoshell::backtrace::print
             at /home/fred/src-obj/servo/ports/servoshell/backtrace.rs:18:5
   1: servoshell::panic_hook::panic_hook
             at /home/fred/src-obj/servo/ports/servoshell/panic_hook.rs:40:17
   2: core::ops::function::Fn::call
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:79:5
   3: <alloc::boxed::Box<dyn for<'a, 'b> core::ops::function::Fn<(&'a std::panic::PanicHookInfo<'b>,), Output = ()> + core::marker::Sync + core::marker::Send> as core::ops::function::Fn<(&std::panic::PanicHookInfo,)>>::call
             at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library/alloc/src/boxed.rs:2254:9
      std::panicking::panic_with_hook
             at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library/std/src/panicking.rs:833:13
   4: std::panicking::panic_handler::{closure#0}
             at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library/std/src/panicking.rs:691:13
   5: std::sys::backtrace::__rust_end_short_backtrace::<std::panicking::panic_handler::{closure#0}, !>
             at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library/std/src/sys/backtrace.rs:182:18
   6: __rustc::rust_begin_unwind
             at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library/std/src/panicking.rs:689:5
   7: core::panicking::panic_fmt
             at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library/core/src/panicking.rs:80:14
   8: core::panicking::panic
             at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library/core/src/panicking.rs:150:5
   9: style::servo::animation::Animation::iterate_by
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/servo/animation.rs:619:13
  10: style::servo::animation::Animation::update_from_other
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/servo/animation.rs:748:26
  11: style::servo::animation::maybe_start_animations
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/servo/animation.rs:1877:22
  12: style::servo::animation::ElementAnimationSet::update_animations_for_new_style
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/servo/animation.rs:1266:9
  13: style::matching::PrivateMatchMethods::process_animations_for_style
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/matching.rs:750:27
  14: style::matching::PrivateMatchMethods::process_animations
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/matching.rs:553:34
  15: style::matching::MatchMethods::finish_restyle
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/matching.rs:974:14
  16: style::traversal::compute_style
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/traversal.rs:629:13
  17: style::traversal::recalc_style_at
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/traversal.rs:389:30
  18: <layout::traversal::RecalcStyle as style::traversal::DomTraversal<E>>::process_preorder
             at /home/fred/src-obj/servo/components/layout/traversal.rs:62:9
  19: style::parallel::style_trees
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/parallel.rs:171:19
  20: style::driver::traverse_dom::{{closure}}
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/driver.rs:136:9
  21: style::driver::with_pool_in_place_scope::{{closure}}
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/driver.rs:66:17
  22: rayon_core::scope::do_in_place_scope_fifo::{{closure}}
             at /home/fred/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-core-1.13.0/src/scope/mod.rs:462:36
  23: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:274:9
  24: std::panicking::catch_unwind::do_call
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:581:40
  25: __rust_try
  26: std::panicking::catch_unwind
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:544:19
      std::panic::catch_unwind
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:359:14
  27: rayon_core::unwind::halt_unwinding
             at /home/fred/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-core-1.13.0/src/unwind.rs:17:5
  28: rayon_core::scope::ScopeBase::execute_job_closure
             at /home/fred/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-core-1.13.0/src/scope/mod.rs:693:28
  29: rayon_core::scope::ScopeBase::complete
             at /home/fred/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-core-1.13.0/src/scope/mod.rs:671:31
  30: rayon_core::scope::do_in_place_scope_fifo
             at /home/fred/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-core-1.13.0/src/scope/mod.rs:462:16
  31: rayon_core::thread_pool::ThreadPool::in_place_scope_fifo
             at /home/fred/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-core-1.13.0/src/thread_pool/mod.rs:327:9
  32: style::driver::with_pool_in_place_scope
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/driver.rs:58:14
  33: style::driver::traverse_dom
             at /home/fred/.cargo/git/checkouts/stylo-482338307e42a9ea/5685b27/style/driver.rs:125:5
  34: layout::layout_impl::LayoutThread::restyle_and_build_trees
             at /home/fred/src-obj/servo/components/layout/layout_impl.rs:1245:26
  35: layout::layout_impl::LayoutThread::handle_reflow
             at /home/fred/src-obj/servo/components/layout/layout_impl.rs:1039:58
  36: <layout::layout_impl::LayoutThread as layout_api::Layout>::reflow::{{closure}}::{{closure}}
             at /home/fred/src-obj/servo/components/layout/layout_impl.rs:693:42
  37: layout_api::with_layout_state
             at /home/fred/src-obj/servo/components/shared/layout/lib.rs:987:5
  38: <layout::layout_impl::LayoutThread as layout_api::Layout>::reflow::{{closure}}
             at /home/fred/src-obj/servo/components/layout/layout_impl.rs:693:16
  39: profile_traits::time::profile
             at /home/fred/src-obj/servo/components/shared/profile/time.rs:212:9
  40: <layout::layout_impl::LayoutThread as layout_api::Layout>::reflow
             at /home/fred/src-obj/servo/components/layout/layout_impl.rs:689:9
  41: <script::dom::window::window::Window>::reflow
             at /home/fred/src-obj/servo/components/script/dom/window/window.rs:2640:60
  42: <script::dom::document::document::Document>::update_the_rendering
             at /home/fred/src-obj/servo/components/script/dom/document/document.rs:3130:57
  43: <script::dom::window::window::Window>::allow_layout_if_necessary
             at /home/fred/src-obj/servo/components/script/dom/window/window.rs:2786:54
  44: <script::dom::document::document::Document>::finish_load
             at /home/fred/src-obj/servo/components/script/dom/document/document.rs:2037:35
  45: <script::dom::servoparser::ServoParser>::finish
             at /home/fred/src-obj/servo/components/script/dom/servoparser/mod.rs:773:23
  46: <script::dom::servoparser::ServoParser>::parse_sync
             at /home/fred/src-obj/servo/components/script/dom/servoparser/mod.rs:673:18
  47: <script::dom::servoparser::ParserContext as script::network_listener::FetchResponseListener>::process_response_eof
             at /home/fred/src-obj/servo/components/script/dom/servoparser/mod.rs:1551:20
  48: <script::script_thread::ScriptThread>::handle_fetch_eof
             at /home/fred/src-obj/servo/components/script/script_thread.rs:4024:21
  49: <script::script_thread::ScriptThread>::handle_navigation_response
             at /home/fred/src-obj/servo/components/script/script_thread.rs:3938:22
  50: <script::script_thread::ScriptThread>::handle_msg_from_script
             at /home/fred/src-obj/servo/components/script/script_thread.rs:2124:22
  51: <script::script_thread::ScriptThread>::handle_msgs::{closure#3}
             at /home/fred/src-obj/servo/components/script/script_thread.rs:1504:38
  52: <script::script_thread::ScriptThread>::profile_event::<<script::script_thread::ScriptThread>::handle_msgs::{closure#3}, bool>
             at /home/fred/src-obj/servo/components/script/script_thread.rs:1760:13
  53: <script::script_thread::ScriptThread>::handle_msgs
             at /home/fred/src-obj/servo/components/script/script_thread.rs:1494:40
  54: <script::script_thread::ScriptThread>::start
             at /home/fred/src-obj/servo/components/script/script_thread.rs:1075:20
  55: <script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}::{closure#1}
             at /home/fred/src-obj/servo/components/script/script_thread.rs:513:38
  56: <profile_traits::mem::ProfilerChan>::run_with_memory_reporting::<<script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}::{closure#1}, script::messaging::CommonScriptMsg::CollectReports, script::messaging::CommonScriptMsg, script::messaging::ScriptEventLoopSender>
             at /home/fred/src-obj/servo/components/shared/profile/mem.rs:143:9
  57: <script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}
             at /home/fred/src-obj/servo/components/script/script_thread.rs:512:40
  58: std::sys::backtrace::__rust_begin_short_backtrace::<<script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}, ()>
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/backtrace.rs:166:18
  59: std::thread::lifecycle::spawn_unchecked::<<script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}, ()>::{closure#1}::{closure#0}
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/lifecycle.rs:91:13
  60: <core::panic::unwind_safe::AssertUnwindSafe<std::thread::lifecycle::spawn_unchecked<<script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}, ()>::{closure#1}::{closure#0}> as core::ops::function::FnOnce<()>>::call_once
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:274:9
  61: std::panicking::catch_unwind::do_call::<core::panic::unwind_safe::AssertUnwindSafe<std::thread::lifecycle::spawn_unchecked<<script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}, ()>::{closure#1}::{closure#0}>, ()>
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:581:40
  62: __rust_try
  63: std::panicking::catch_unwind::<(), core::panic::unwind_safe::AssertUnwindSafe<std::thread::lifecycle::spawn_unchecked<<script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}, ()>::{closure#1}::{closure#0}>>
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panicking.rs:544:19
      std::panic::catch_unwind::<core::panic::unwind_safe::AssertUnwindSafe<std::thread::lifecycle::spawn_unchecked<<script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}, ()>::{closure#1}::{closure#0}>, ()>
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/panic.rs:359:14
      std::thread::lifecycle::spawn_unchecked::<<script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}, ()>::{closure#1}
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/lifecycle.rs:89:26
  64: <std::thread::lifecycle::spawn_unchecked<<script::script_thread::ScriptThread as layout_api::ScriptThreadFactory>::create::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
             at /home/fred/.rustup/toolchains/1.95.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
  65: <alloc::boxed::Box<dyn core::ops::function::FnOnce<(), Output = ()> + core::marker::Send> as core::ops::function::FnOnce<()>>::call_once
             at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library/alloc/src/boxed.rs:2240:9
      <std::sys::thread::unix::Thread>::new::thread_start
             at /rustc/59807616e1fa2540724bfbac14d7976d7e4a3860/library/std/src/sys/thread/unix.rs:118:17
  66: start_thread
             at ./nptl/pthread_create.c:447:8
  67: clone3
             at ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:78:0