209333 2020-03-20 04:07:27 -0700 br_table behavior 2020-04-07 14:57:55 -0700 1 1 1 Unclassified WebKit WebAssembly WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mail tzagallo alessandro ews-watchlist fpizlo keith_miller mark.lam msaboff saam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1632048 0 394075 mail 2020-03-20 04:07:27 -0700 Created attachment 394075 wasm program causing the crash I'm running the prebuilt JavaScriptCore, version 258753 installed through jsvu https://bugs.webkit.org/show_bug.cgi?id=179945 Consider the following wasm program: (module (type $0 (func)) (type $1 (func (result f64))) (func $0 (type 0)) (func $1 (type 1) (loop (result f64) (f64.const 0.0) (i32.const 0) (br_table 1) (call 0)) (br 0) (unreachable) ) (export "runf64" (func 1)) ) and the corresponding JavaScript validating and calling the exported function: let buffer = new Uint8Array([ 0,97,115,109,1,0,0,0,1,136,128,128,128,0,2,96,0,0,96,0,1,124,3,131,128,128,128,0,2,0,1,7,138,128,128,128,0,1,6,114,117,110,102,54,52,0,1,10,165,128,128,128,0,2,130,128,128,128,0,0,11,152,128,128,128,0,0,3,124,68,0,0,0,0,0,0,0,0,65,0,14,0,1,16,0,11,12,0,0,11 ]); print(WebAssembly.validate(buffer)); let m = new WebAssembly.Instance(new WebAssembly.Module(buffer)); print(m.exports.runf64().toString()); SpiderMonkey, V8, and Chakra all behave the same: $ sm jscissue3-validate-hyp-min.js true 0 $ v8 jscissue3-validate-hyp-min.js true 0 $ ch jscissue3-validate-hyp-min.js true 0 However jsc loops as far as I can tell. I think the cause is (br_table 1) executing with a 0 on top of the stack and an empty label list. As I understand the standard https://webassembly.github.io/spec/core/exec/instructions.html#control-instructions |l*| <= 0 and hence this should behave the same as (br 1), i.e., break out of the outermost control-context and therefore return. This agrees with the behavior of SpiderMonkey, V8, and Chakra. Trying the above JS snippet in Safari 12.1.2 with AppleWebKit/605.1.15 I also get "true" and "0" as expected. This may indicate a recent regression. 1633344 1 ap 2020-03-24 09:32:29 -0700 I can reproduce this with WebKit as shipped with macOS 10.15.4. This is all that sample says, it's just looping in wasm_entry. Call graph: 9415 Thread_2342286 DispatchQueue_1: com.apple.main-thread (serial) + 9415 start (in libdyld.dylib) + 1 [0x7fff6b6decc9] + 9415 ??? (in jsc) load address 0x10cec7000 + 0x436b [0x10cecb36b] + 9415 ??? (in jsc) load address 0x10cec7000 + 0x56c6 [0x10cecc6c6] + 9415 ??? (in jsc) load address 0x10cec7000 + 0xc64a [0x10ced364a] + 9415 JSC::evaluate(JSC::JSGlobalObject*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (in JavaScriptCore) + 270 [0x7fff3580959e] + 9415 JSC::Interpreter::executeProgram(JSC::SourceCode const&, JSC::JSGlobalObject*, JSC::JSObject*) (in JavaScriptCore) + 12478 [0x7fff355effee] + 9415 vmEntryToJavaScript (in JavaScriptCore) + 200 [0x7fff34ff82bf] + 9415 llint_entry (in JavaScriptCore) + 93344 [0x7fff3500f10d] + 9415 ??? (in <unknown binary>) [0x2ebdd2601178] + 9415 JSC::callWebAssemblyFunction(JSC::JSGlobalObject*, JSC::CallFrame*) (in JavaScriptCore) + 1235 [0x7fff35adf9b3] + 9415 vmEntryToJavaScript (in JavaScriptCore) + 200 [0x7fff34ff82bf] + 9415 ??? (in <unknown binary>) [0x2ebdd260170c] + 9415 wasm_entry (in JavaScriptCore) + 13022,12990,... [0x7fff35014322,0x7fff35014302,...] 9415 Thread_2342288: JavaScriptCore bmalloc scavenger + 9415 thread_start (in libsystem_pthread.dylib) + 15 [0x7fff6b8deb8b] + 9415 _pthread_start (in libsystem_pthread.dylib) + 148 [0x7fff6b8e3109] + 9415 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*> >(void*) (in JavaScriptCore) + 39 [0x7fff35c1dec7] + 9415 bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*) (in JavaScriptCore) + 9 [0x7fff35c1b7e9] + 9415 bmalloc::Scavenger::threadRunLoop() (in JavaScriptCore) + 299 [0x7fff35c1bc1b] + 9415 void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >(std::__1::unique_lock<bmalloc::Mutex>&) (in JavaScriptCore) + 84 [0x7fff35c17414] + 9415 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) (in libc++.1.dylib) + 18 [0x7fff689b2592] + 9415 _pthread_cond_wait (in libsystem_pthread.dylib) + 698 [0x7fff6b8e3425] + 9415 __psynch_cvwait (in libsystem_kernel.dylib) + 10 [0x7fff6b822882] 9415 Thread_2342289 9415 start_wqthread (in libsystem_pthread.dylib) + 15 [0x7fff6b8deb77] 9415 _pthread_wqthread (in libsystem_pthread.dylib) + 390 [0x7fff6b8dfaa1] 9415 __workq_kernreturn (in libsystem_kernel.dylib) + 10 [0x7fff6b8214ce] 1633345 2 webkit-bug-importer 2020-03-24 09:32:35 -0700 <rdar://problem/60827987> 1633690 3 394446 tzagallo 2020-03-24 17:21:01 -0700 Created attachment 394446 Patch 1633709 4 ews-feeder 2020-03-24 17:51:49 -0700 Committed r258965: <https://trac.webkit.org/changeset/258965> All reviewed patches have been landed. Closing bug and clearing flags on attachment 394446. 1638820 5 tzagallo 2020-04-07 14:57:55 -0700 *** Bug 210105 has been marked as a duplicate of this bug. *** 394075 2020-03-20 04:07:27 -0700 2020-03-20 04:07:27 -0700 wasm program causing the crash jscissue3-validate-hyp-min.js application/x-javascript 434 mail bGV0IGJ1ZmZlciA9IG5ldyBVaW50OEFycmF5KFsgMCw5NywxMTUsMTA5LDEsMCwwLDAsMSwxMzYs MTI4LDEyOCwxMjgsMCwyLDk2LDAsMCw5NiwwLDEsMTI0LDMsMTMxLDEyOCwxMjgsMTI4LDAsMiww LDEsNywxMzgsMTI4LDEyOCwxMjgsMCwxLDYsMTE0LDExNywxMTAsMTAyLDU0LDUyLDAsMSwxMCwx NjUsMTI4LDEyOCwxMjgsMCwyLDEzMCwxMjgsMTI4LDEyOCwwLDAsMTEsMTUyLDEyOCwxMjgsMTI4 LDAsMCwzLDEyNCw2OCwwLDAsMCwwLDAsMCwwLDAsNjUsMCwxNCwwLDEsMTYsMCwxMSwxMiwwLDAs MTEgXSk7CgpwcmludChXZWJBc3NlbWJseS52YWxpZGF0ZShidWZmZXIpKTsKbGV0IG0gPSBuZXcg V2ViQXNzZW1ibHkuSW5zdGFuY2UobmV3IFdlYkFzc2VtYmx5Lk1vZHVsZShidWZmZXIpKTsKcHJp bnQobS5leHBvcnRzLnJ1bmY2NCgpLnRvU3RyaW5nKCkpOwo= 394446 2020-03-24 17:21:01 -0700 2020-03-24 17:51:49 -0700 Patch bug-209333-20200324172100.patch 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