S3TC compressed textures not supported.

[hgallagher1993]

Was looking at #21057 and tried running http://www.fishgl.com/ twice. The first time it started to load a bit and then the screen just went black and came back with

THREE.WebGLRenderer
66
THREE.WebGLRenderer: S3TC compressed textures not supported.
ERROR 2018-06-21T12:08:18Z: script::dom::bindings::error: Error at http://cdnjs.cloudflare.com/ajax/libs/three.js/r66/three.min.js:508:229 Value is not an object.

Second time it crashed completely.

THREE.WebGLRenderer
66
THREE.WebGLRenderer: S3TC compressed textures not supported.
Stack trace for thread "WebGLThread"
stack backtrace:
   0:     0x56422abe1a3c - backtrace::backtrace::trace::h771ec7e4a16b9188
   1:     0x56422abe11e2 - <backtrace::capture::Backtrace as core::default::Default>::default::ha7872455e6e477e3
   2:     0x56422abe1228 - backtrace::capture::Backtrace::new::h7a84dd53000abc29
   3:     0x5642282ac96a - servo::install_crash_handler::handler::h26c503f26429cb1c
   4:     0x56422a8c2043 - AsmJSFaultHandler
                        at /home/hugh/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.51.2/mozjs/js/src/asmjs/WasmSignalHandlers.cpp:1171
   5:     0x7f34388e638f - <unknown>
   6:     0x7f3431c62670 - <unknown>
   7:     0x7f3431c2678c - <unknown>
   8:     0x7f3431c636bd - <unknown>
   9:     0x7f3431c329bd - <unknown>
  10:     0x7f3431d1ee7b - <unknown>
  11:     0x7f3431c21a2d - <unknown>
  12:     0x564229a6ac41 - canvas::webgl_thread::WebGLImpl::apply::h2211b83633a2694f
  13:     0x564229a66743 - <canvas::webgl_thread::WebGLThread<VR, OB>>::handle_webgl_command::h3844398db1e8b318
  14:     0x564229a7f20b - _ZN3std10sys_common9backtrace28__rust_begin_short_backtrace17hee8a769f635be5d5E.llvm.16666124742980333505
  15:     0x564229a42908 - _ZN3std9panicking3try7do_call17ha408d1d317ff6081E.llvm.5047223168149118022
  16:     0x56422ac1d089 - __rust_maybe_catch_panic
                        at libpanic_unwind/lib.rs:105
  17:     0x5642299de396 - <F as alloc::boxed::FnBox<A>>::call_box::h26142975ccb3da54
  18:     0x56422ac0a14a - <alloc::boxed::Box<alloc::boxed::FnBox<A, Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$::call_once::h33f7750e60f08706
                        at /checkout/src/liballoc/boxed.rs:650
                         - std::sys_common::thread::start_thread::h6388563430773280
                        at libstd/sys_common/thread.rs:24
  19:     0x56422abf4aa5 - std::sys::unix::thread::Thread::new::thread_start::h1f8b132362b26e8b
                        at libstd/sys/unix/thread.rs:90
  20:     0x7f34388dc6b9 - start_thread
  21:     0x7f343717841c - clone
  22:                0x0 - <unknown>
Stack trace for thread "WebGLThread"
stack backtrace:
   0:     0x56422abe1a3c - backtrace::backtrace::trace::h771ec7e4a16b9188
   1:     0x56422abe11e2 - <backtrace::capture::Backtrace as core::default::Default>::default::ha7872455e6e477e3
   2:     0x56422abe1228 - backtrace::capture::Backtrace::new::h7a84dd53000abc29
   3:     0x5642282ac96a - servo::install_crash_handler::handler::h26c503f26429cb1c
   4:     0x7f34370a64af - <unknown>
   5:     0x5642282ac9f2 - servo::install_crash_handler::handler::h26c503f26429cb1c
   6:     0x56422a8c2043 - AsmJSFaultHandler
                        at /home/hugh/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.51.2/mozjs/js/src/asmjs/WasmSignalHandlers.cpp:1171
   7:     0x7f34388e638f - <unknown>
   8:     0x7f3431c62670 - <unknown>
   9:     0x7f3431c2678c - <unknown>
  10:     0x7f3431c636bd - <unknown>
  11:     0x7f3431c329bd - <unknown>
  12:     0x7f3431d1ee7b - <unknown>
  13:     0x7f3431c21a2d - <unknown>
  14:     0x564229a6ac41 - canvas::webgl_thread::WebGLImpl::apply::h2211b83633a2694f
  15:     0x564229a66743 - <canvas::webgl_thread::WebGLThread<VR, OB>>::handle_webgl_command::h3844398db1e8b318
  16:     0x564229a7f20b - _ZN3std10sys_common9backtrace28__rust_begin_short_backtrace17hee8a769f635be5d5E.llvm.16666124742980333505
  17:     0x564229a42908 - _ZN3std9panicking3try7do_call17ha408d1d317ff6081E.llvm.5047223168149118022
  18:     0x56422ac1d089 - __rust_maybe_catch_panic
                        at libpanic_unwind/lib.rs:105
  19:     0x5642299de396 - <F as alloc::boxed::FnBox<A>>::call_box::h26142975ccb3da54
  20:     0x56422ac0a14a - <alloc::boxed::Box<alloc::boxed::FnBox<A, Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$::call_once::h33f7750e60f08706
                        at /checkout/src/liballoc/boxed.rs:650
                         - std::sys_common::thread::start_thread::h6388563430773280
                        at libstd/sys_common/thread.rs:24
  21:     0x56422abf4aa5 - std::sys::unix::thread::Thread::new::thread_start::h1f8b132362b26e8b
                        at libstd/sys/unix/thread.rs:90
  22:     0x7f34388dc6b9 - start_thread
  23:     0x7f343717841c - clone
  24:                0x0 - <unknown>
Servo exited with return value -4

[emilio]

FWIW both Gecko and Chromium force-enable compression in mesa at startup.

Of course not sure whether that's the cause of the crash. The crash looks like a driver bug.

[hgallagher1993]

It works perfectly in Firefox (nightly) and Chrome (stable) for me, no errors so could it still be a driver bug if it's only Servo that doesn't?

[emilio]

Yeah, potentially, all browsers have different WebGL architecture, so it may make the driver take different code paths. Does Servo crash on your machine running it with:

$ force_s3tc_enable=true ./mach run

?

[hgallagher1993]

Nope no crash, loads the Servo home page straight away, no warnings or anything.

[emilio]

Well, I meant running http://www.fishgl.com/, that is:

$ force_s3tc_enable=true ./mach run http://www.fishgl.com

[hgallagher1993]

Sorry I should've said I ran that as well it didn't crash either it basically just froze, like it loaded to 100% and went to the next screen but the fish tank never loaded. I can see the door and shelves and the red alarm and whatever else but just no fish tank.

[jdm]

FishGL now works fine!