```
frame #9: 0x000000011b53d95c XUL`core::panicking::panic::h5713e7735cef5fa8 at panicking.rs:48:5 [opt]
frame #10: 0x000000011a63a65c XUL`webrender::scene_building::SceneBuilder::build_all::h3791bbca4e6b32ba at scene_building.rs:1084:17 [opt]
frame #11: 0x000000011a63a644 XUL`webrender::scene_building::SceneBuilder::build_all::h3791bbca4e6b32ba(self=<unavailable>, root_pipeline=<unavailable>) at scene_building.rs:869:50 [opt]
frame #12: 0x000000011a6374fc XUL`webrender::scene_building::SceneBuilder::build::h52fafe1e57b443de(scene=<unavailable>, fonts=SharedFontResources @ 0x0000000173a142b0, view=0x000000013f051d40, frame_builder_config=0x0000000173a16968, interners=0x000000013f0513e8, spatial_tree=0x000000013f051ca0, stats=0x000000013f051c68) at scene_building.rs:592:9 [opt]
frame #13: 0x000000011a5e3e90 XUL`webrender::scene_builder_thread::SceneBuilderThread::process_transaction::h9fcd3c1dc5d2f709(self=0x0000000173a16928, txn=<unavailable>) at scene_builder_thread.rs:597:25 [opt]
frame #14: 0x000000011a7ec0a4 XUL`_$LT$core..iter..adapters..map..Map$LT$I$C$F$GT$$u20$as$u20$core..iter..traits..iterator..Iterator$GT$::try_fold::h6acc4f4b6e1d2a59 [inlined] webrender::scene_builder_thread::SceneBuilderThread::run::_$u7b$$u7b$closure$u7d$$u7d$::h802df614991915d1(txn=0x00000001275bfb50) at scene_builder_thread.rs:314:36 [opt]
frame #15: 0x000000011a7ec058 XUL`_$LT$core..iter..adapters..map..Map$LT$I$C$F$GT$$u20$as$u20$core..iter..traits..iterator..Iterator$GT$::try_fold::h6acc4f4b6e1d2a59 [inlined] core::iter::adapters::map::map_try_fold::_$u7b$$u7b$closure$u7d$$u7d$::hd31b8e8d587a98b4(acc=InPlaceDrop<alloc::boxed::Box<webrender::scene_builder_thread::BuiltTransaction, alloc::alloc::Global>> @ 0x0000600002bb0e70, elt=0x00000001275bfb50) at map.rs:91:28 [opt]
frame #16: 0x000000011a7ec058 XUL`_$LT$core..iter..adapters..map..Map$LT$I$C$F$GT$$u20$as$u20$core..iter..traits..iterator..Iterator$GT$::try_fold::h6acc4f4b6e1d2a59 at iterator.rs:2238:21 [opt]
frame #17: 0x000000011a7ec03c XUL`_$LT$core..iter..adapters..map..Map$LT$I$C$F$GT$$u20$as$u20$core..iter..traits..iterator..Iterator$GT$::try_fold::h6acc4f4b6e1d2a59(self=0x0000000173a15d80, init=InPlaceDrop<alloc::boxed::Box<webrender::scene_builder_thread::BuiltTransaction, alloc::alloc::Global>> @ 0x0000600002bb0e70, g=<unavailable>) at map.rs:117:9 [opt]
frame #18: 0x000000011a5d5ed0 XUL`alloc::vec::in_place_collect::_$LT$impl$u20$alloc..vec..spec_from_iter..SpecFromIter$LT$T$C$I$GT$$u20$for$u20$alloc..vec..Vec$LT$T$GT$$GT$::from_iter::h349d858cf48103cd at in_place_collect.rs:251:13 [opt]
frame #19: 0x000000011a5d5eb4 XUL`alloc::vec::in_place_collect::_$LT$impl$u20$alloc..vec..spec_from_iter..SpecFromIter$LT$T$C$I$GT$$u20$for$u20$alloc..vec..Vec$LT$T$GT$$GT$::from_iter::h349d858cf48103cd(iterator=Map<alloc::vec::into_iter::IntoIter<alloc::boxed::Box<webrender::render_api::TransactionMsg, alloc::alloc::Global>, alloc::alloc::Global>, webrender::scene_builder_thread::{impl#2}::run::{closure_env#0}> @ 0x0000000173a15d80) at in_place_collect.rs:178:19 [opt]
frame #20: 0x000000011a5e20d0 XUL`webrender::scene_builder_thread::SceneBuilderThread::run::h6316ff879f26e28d [inlined] _$LT$alloc..vec..Vec$LT$T$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$T$GT$$GT$::from_iter::hf796586e92188c75(iter=<unavailable>) at mod.rs:2649:9 [opt]
frame #21: 0x000000011a5e20a8 XUL`webrender::scene_builder_thread::SceneBuilderThread::run::h6316ff879f26e28d [inlined] core::iter::traits::iterator::Iterator::collect::heaa2617
```
Bug 1805209 Comment 0 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
```
frame #9: 0x000000011b53d95c XUL`core::panicking::panic::h5713e7735cef5fa8 at panicking.rs:48:5 [opt]
frame #10: 0x000000011a63a65c XUL`webrender::scene_building::SceneBuilder::build_all::h3791bbca4e6b32ba at scene_building.rs:1084:17 [opt]
frame #11: 0x000000011a63a644 XUL`webrender::scene_building::SceneBuilder::build_all::h3791bbca4e6b32ba(self=<unavailable>, root_pipeline=<unavailable>) at scene_building.rs:869:50 [opt]
frame #12: 0x000000011a6374fc XUL`webrender::scene_building::SceneBuilder::build::h52fafe1e57b443de(scene=<unavailable>, fonts=SharedFontResources @ 0x0000000173a142b0, view=0x000000013f051d40, frame_builder_config=0x0000000173a16968, interners=0x000000013f0513e8, spatial_tree=0x000000013f051ca0, stats=0x000000013f051c68) at scene_building.rs:592:9 [opt]
frame #13: 0x000000011a5e3e90 XUL`webrender::scene_builder_thread::SceneBuilderThread::process_transaction::h9fcd3c1dc5d2f709(self=0x0000000173a16928, txn=<unavailable>) at scene_builder_thread.rs:597:25 [opt]
frame #14: 0x000000011a7ec0a4 XUL`_$LT$core..iter..adapters..map..Map$LT$I$C$F$GT$$u20$as$u20$core..iter..traits..iterator..Iterator$GT$::try_fold::h6acc4f4b6e1d2a59 [inlined] webrender::scene_builder_thread::SceneBuilderThread::run::_$u7b$$u7b$closure$u7d$$u7d$::h802df614991915d1(txn=0x00000001275bfb50) at scene_builder_thread.rs:314:36 [opt]
frame #15: 0x000000011a7ec058 XUL`_$LT$core..iter..adapters..map..Map$LT$I$C$F$GT$$u20$as$u20$core..iter..traits..iterator..Iterator$GT$::try_fold::h6acc4f4b6e1d2a59 [inlined] core::iter::adapters::map::map_try_fold::_$u7b$$u7b$closure$u7d$$u7d$::hd31b8e8d587a98b4(acc=InPlaceDrop<alloc::boxed::Box<webrender::scene_builder_thread::BuiltTransaction, alloc::alloc::Global>> @ 0x0000600002bb0e70, elt=0x00000001275bfb50) at map.rs:91:28 [opt]
frame #16: 0x000000011a7ec058 XUL`_$LT$core..iter..adapters..map..Map$LT$I$C$F$GT$$u20$as$u20$core..iter..traits..iterator..Iterator$GT$::try_fold::h6acc4f4b6e1d2a59 at iterator.rs:2238:21 [opt]
frame #17: 0x000000011a7ec03c XUL`_$LT$core..iter..adapters..map..Map$LT$I$C$F$GT$$u20$as$u20$core..iter..traits..iterator..Iterator$GT$::try_fold::h6acc4f4b6e1d2a59(self=0x0000000173a15d80, init=InPlaceDrop<alloc::boxed::Box<webrender::scene_builder_thread::BuiltTransaction, alloc::alloc::Global>> @ 0x0000600002bb0e70, g=<unavailable>) at map.rs:117:9 [opt]
frame #18: 0x000000011a5d5ed0 XUL`alloc::vec::in_place_collect::_$LT$impl$u20$alloc..vec..spec_from_iter..SpecFromIter$LT$T$C$I$GT$$u20$for$u20$alloc..vec..Vec$LT$T$GT$$GT$::from_iter::h349d858cf48103cd at in_place_collect.rs:251:13 [opt]
frame #19: 0x000000011a5d5eb4 XUL`alloc::vec::in_place_collect::_$LT$impl$u20$alloc..vec..spec_from_iter..SpecFromIter$LT$T$C$I$GT$$u20$for$u20$alloc..vec..Vec$LT$T$GT$$GT$::from_iter::h349d858cf48103cd(iterator=Map<alloc::vec::into_iter::IntoIter<alloc::boxed::Box<webrender::render_api::TransactionMsg, alloc::alloc::Global>, alloc::alloc::Global>, webrender::scene_builder_thread::{impl#2}::run::{closure_env#0}> @ 0x0000000173a15d80) at in_place_collect.rs:178:19 [opt]
frame #20: 0x000000011a5e20d0 XUL`webrender::scene_builder_thread::SceneBuilderThread::run::h6316ff879f26e28d [inlined] _$LT$alloc..vec..Vec$LT$T$GT$$u20$as$u20$core..iter..traits..collect..FromIterator$LT$T$GT$$GT$::from_iter::hf796586e92188c75(iter=<unavailable>) at mod.rs:2649:9 [opt]
frame #21: 0x000000011a5e20a8 XUL`webrender::scene_builder_thread::SceneBuilderThread::run::h6316ff879f26e28d [inlined] core::iter::traits::iterator::Iterator::collect::heaa2617
```
```
1081 let pipeline = match self.scene.pipelines.get(&iframe_pipeline_id) {
1082 Some(pipeline) => pipeline,
1083 None => {
-> 1084 debug_assert!(info.ignore_missing_pipeline);
1085 return None
1086 },
1087 };
```