1462333 - Assertion failure: !rt->mainContextFromOwnThread()->suppressGC, at js/src/gc/GC.cpp:7228 with verifyprebarries

Status: RESOLVED FIXED

(Core :: JavaScript: GC, defect)

Description

[Christian Holler (:decoder)]

The following testcase crashes on mozilla-central revision 8fb36531f7d0 (build with --enable-posix-nspr-emulation --enable-valgrind --enable-gczeal --disable-tests --disable-profiling --enable-debug --enable-optimize, run with --fuzzing-safe --wasm-gc):

var lfModule = new WebAssembly.Module(wasmTextToBinary(`
    (module
        (import "global" "func" (result i32))
        (func (export "func_0") (result i32)
         call 0 ;; calls the import, which is func #0
        )
    )
`));
verifyprebarriers();
processModule(lfModule, `
    verifyprebarriers();
`);
function processModule(module, jscode) {
    imports = {}
    for (let descriptor of WebAssembly.Module.imports(module)) {
        imports[descriptor.module] = {}
        imports[descriptor.module][descriptor.name] = new Function("x", "y", "z", jscode);
        instance = new WebAssembly.Instance(module, imports);
        for (let descriptor of WebAssembly.Module.exports(module))
            instance.exports[descriptor.name]();
    }
}


Backtrace:

received signal SIGSEGV, Segmentation fault.
0x0000000000ee9730 in js::gc::IsIncrementalGCUnsafe (rt=0x7ffff5f19000) at js/src/gc/GC.cpp:7228
#0  0x0000000000ee9730 in js::gc::IsIncrementalGCUnsafe (rt=0x7ffff5f19000) at js/src/gc/GC.cpp:7228
#1  0x0000000000f85d27 in js::gc::GCRuntime::endVerifyPreBarriers (this=0x7ffff5f19700) at js/src/gc/Verifier.cpp:362
#2  0x0000000000f8912f in js::gc::GCRuntime::verifyPreBarriers (this=<optimized out>) at js/src/gc/Verifier.cpp:406
#3  js::gc::VerifyBarriers (rt=<optimized out>, type=type@entry=js::gc::PreBarrierVerifier) at js/src/gc/Verifier.cpp:415
#4  0x00000000008b319b in VerifyPreBarriers (cx=<optimized out>, argc=<optimized out>, vp=<optimized out>) at js/src/builtin/TestingFunctions.cpp:1026
#5  0x00000000005b4b1e in js::CallJSNative (cx=0x7ffff5f17000, native=0x8b3150 <VerifyPreBarriers(JSContext*, unsigned int, JS::Value*)>, args=...) at js/src/vm/JSContext-inl.h:280
#6  0x00000000005a9a3f in js::InternalCallOrConstruct (cx=<optimized out>, cx@entry=0x7ffff5f17000, args=..., construct=construct@entry=js::NO_CONSTRUCT) at js/src/vm/Interpreter.cpp:467
#7  0x00000000005a9e1d in InternalCall (cx=0x7ffff5f17000, args=...) at js/src/vm/Interpreter.cpp:516
#8  0x000000000059d517 in js::CallFromStack (args=..., cx=<optimized out>) at js/src/vm/Interpreter.cpp:522
#9  Interpret (cx=0x7ffff5f17000, state=...) at js/src/vm/Interpreter.cpp:3086
#10 0x00000000005a94fd in js::RunScript (cx=0x7ffff5f17000, state=...) at js/src/vm/Interpreter.cpp:417
#11 0x00000000005a9b07 in js::InternalCallOrConstruct (cx=<optimized out>, cx@entry=0x7ffff5f17000, args=..., construct=construct@entry=js::NO_CONSTRUCT) at js/src/vm/Interpreter.cpp:489
#12 0x00000000005a9e1d in InternalCall (cx=0x7ffff5f17000, args=...) at js/src/vm/Interpreter.cpp:516
#13 0x00000000005a9fa0 in js::Call (cx=<optimized out>, fval=..., fval@entry=..., thisv=..., thisv@entry=..., args=..., rval=...) at js/src/vm/Interpreter.cpp:535
#14 0x0000000000e1eb68 in js::wasm::Instance::callImport (this=this@entry=0x7ffff495c660, cx=<optimized out>, cx@entry=0x7ffff5f17000, funcImportIndex=funcImportIndex@entry=0, argc=argc@entry=0, argv=argv@entry=0x7fffffffc4f0, rval=..., rval@entry=...) at js/src/wasm/WasmInstance.cpp:156
#15 0x0000000000e1f664 in js::wasm::Instance::callImport_i32 (instance=0x7ffff495c660, funcImportIndex=0, argc=0, argv=0x7fffffffc4f0) at js/src/wasm/WasmInstance.cpp:252
#16 0x00000e0a5275d0fc in ?? ()
[...]
#22 0x0000000000000000 in ?? ()
rax	0x0	0
rbx	0x7ffff5f19000	140737319636992
rcx	0x7ffff6c282ad	140737333330605
rdx	0x0	0
rsi	0x7ffff6ef7770	140737336276848
rdi	0x7ffff6ef6540	140737336272192
rbp	0x7fffffffb2d0	140737488335568
rsp	0x7fffffffb2c0	140737488335552
r8	0x7ffff6ef7770	140737336276848
r9	0x7ffff7fe4780	140737354024832
r10	0x58	88
r11	0x7ffff6b9e7a0	140737332766624
r12	0x7ffff5f17000	140737319628800
r13	0x7ffff5f1a9d8	140737319643608
r14	0x7ffff5f1a958	140737319643480
r15	0x3	3
rip	0xee9730 <js::gc::IsIncrementalGCUnsafe(JSRuntime*)+112>
=> 0xee9730 <js::gc::IsIncrementalGCUnsafe(JSRuntime*)+112>:	movl   $0x0,0x0
   0xee973b <js::gc::IsIncrementalGCUnsafe(JSRuntime*)+123>:	ud2

Comment 1

[Fuzzing Team]

JSBugMon: Cannot process bug: Unable to automatically reproduce, please track manually.

Comment 2

[Nicolas B. Pierron [:nbp]]

Benjamin, is this related to the suppressGC behaviour of Wasm, which I read about in another bug?

Comment 4

[Benjamin Bouvier [:bbouvier] (inactive)]

Attachment: fix.patch

Yup, another testing function to disable until wasm gc is implemented.

Comment 5

[Christian Holler (:decoder)]

scheduleforgc probably needs the same fix.

Comment 6

[Benjamin Bouvier [:bbouvier] (inactive)]

Attachment: selectforgc.patch

Comment 7

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/mozilla-inbound/rev/32458516749f
Disable VerifyPrebarriers when wasm gc is enabled; r=jonco
https://hg.mozilla.org/integration/mozilla-inbound/rev/1ea8ffe16237
Block testing function selectforgc when wasm gc is enabled; r=jonco

Comment 8

[Dorel Luca [:dluca]]

https://hg.mozilla.org/mozilla-central/rev/32458516749f
https://hg.mozilla.org/mozilla-central/rev/1ea8ffe16237