Intermittent CRASH IN /_webgl/conformance/textures/misc/texture-size-limit.html

[asajeffrey]

A GL_OUT_OF_MEMORY error:

▶ CRASH [expected OK] /_webgl/conformance/textures/misc/texture-size-limit.html
  │ 
  │ error: XDG_RUNTIME_DIR not set in the environment.
  │ libEGL warning: No hardware driver found, falling back to software rendering
  │ [2020-03-07T01:55:35Z ERROR canvas::webgl_thread] Last GL operation failed: TexImage2D { target: 34069, level: 13, effective_internal_format: 6410, size: 1×1, format: LuminanceAlpha, data_type: UnsignedByte, effective_data_type: 5121, unpacking_alignment: 1, alpha_treatment: None, y_axis_treatment: AsIs, pixel_format: None, data: IpcSharedMemory { os... }
  │ Unexpected WebGL error: 0x505 (1285) [TexImage2D { target: 34069, level: 13, effective_internal_format: 6410, size: 1×1, format: LuminanceAlpha, data_type: UnsignedByte, effective_data_type: 5121, unpacking_alignment: 1, alpha_treatment: None, y_axis_treatment: AsIs, pixel_format: None, data: IpcSharedMemory { os... }] (thread WebGL thread, at components/canvas/webgl_thread.rs:2141)
  │ stack backtrace:
  │    0: servo::backtrace::print
  │    1: servo::main::{{closure}}
  │    2: std::panicking::rust_panic_with_hook
  │              at src/libstd/panicking.rs:474
  │    3: rust_begin_unwind
  │              at src/libstd/panicking.rs:378
  │    4: std::panicking::begin_panic_fmt
  │              at src/libstd/panicking.rs:332
  │    5: canvas::webgl_thread::WebGLImpl::apply
  │    6: _ZN6canvas12webgl_thread11WebGLThread10handle_msg17h65f42ef764255adaE.llvm.5259457731796083051
  │    7: canvas::webgl_thread::WebGLThread::process
  │    8: std::sys_common::backtrace::__rust_begin_short_backtrace
  │    9: _ZN3std9panicking3try7do_call17heaab35c10c870dcaE.llvm.5277134497198370270
  │   10: __rust_maybe_catch_panic
  │              at src/libpanic_unwind/lib.rs:86
  │   11: core::ops::function::FnOnce::call_once{{vtable.shim}}
  │   12: <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once
  │              at /rustc/5d04ce67fd14538d03fa47a2598f80d49fd564c6/src/liballoc/boxed.rs:1017
  │   13: <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once
  │              at /rustc/5d04ce67fd14538d03fa47a2598f80d49fd564c6/src/liballoc/boxed.rs:1017
  │       std::sys_common::thread::start_thread
  │              at src/libstd/sys_common/thread.rs:13
  │       std::sys::unix::thread::Thread::new::thread_start
  │              at src/libstd/sys/unix/thread.rs:80
  │   14: start_thread
  │   15: __clone
  │ [2020-03-07T01:55:35Z ERROR servo] Unexpected WebGL error: 0x505 (1285) [TexImage2D { target: 34069, level: 13, effective_internal_format: 6410, size: 1×1, format: LuminanceAlpha, data_type: UnsignedByte, effective_data_type: 5121, unpacking_alignment: 1, alpha_treatment: None, y_axis_treatment: AsIs, pixel_format: None, data: IpcSharedMemory { os... }]
  │ called `Result::unwrap()` on an `Err` value: () (thread ScriptThread PipelineId { namespace_id: PipelineNamespaceId(1), index: PipelineIndex(1) }, at components/script/dom/webglrenderingcontext.rs:1441)
  │ stack backtrace:
  │    0: servo::backtrace::print
  │    1: servo::main::{{closure}}
  │    2: std::panicking::rust_panic_with_hook
  │              at src/libstd/panicking.rs:474
  │    3: rust_begin_unwind
  │              at src/libstd/panicking.rs:378
  │    4: core::panicking::panic_fmt
  │              at src/libcore/panicking.rs:85
  │    5: core::option::expect_none_failed
  │              at src/libcore/option.rs:1211
  │    6: <script::dom::webglrenderingcontext::WebGLRenderingContext as script::dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextBinding::WebGLRenderingContextMethods>::DrawingBufferWidth
  │    7: _ZN3std9panicking3try7do_call17hf31e928d79b2eea7E.llvm.14950715087653940569
  │    8: __rust_maybe_catch_panic
  │              at src/libpanic_unwind/lib.rs:86
  │    9: script::dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextBinding::get_drawingBufferWidth
  │   10: script::dom::bindings::utils::generic_call
  │   11: <unknown>
  │ [2020-03-07T01:55:35Z ERROR servo] called `Result::unwrap()` on an `Err` value: ()
  └ Pipeline failed in hard-fail mode.  Crashing!

[CYBAI]

Might be same issue 👀 ?

  ▶ CRASH [expected FAIL] /css/CSS2/tables/table-anonymous-objects-097.xht
  │ 
  │ error: XDG_RUNTIME_DIR not set in the environment.
  │ libEGL warning: No hardware driver found, falling back to software rendering
  │ Shutting down the Constellation after generating an output file or exit flag specified
  │ Stack trace for thread "LayoutThread PipelineId { namespace_id: PipelineNamespaceId(1), index: PipelineIndex(1) }"
  └ stack backtrace:

Observed here 👈

[jdm]

That looks like #26129 instead.

[CYBAI]

@jdm do you recognize it as #26129 by following lines 👀 ?

  │ Shutting down the Constellation after generating an output file or exit flag specified
  │ Stack trace for thread "LayoutThread PipelineId { namespace_id: PipelineNamespaceId(1), index: PipelineIndex(1) }"

[jdm]

Yes, my only clue is that it's a segfault in the layout thread. I can tell it's a segfault because there is no panic message reported.