After bug 900669 comment 78 many tests started to fail but nowadays the list is short js/src/jit-test/tests/asm.js/testCaching.js --wasm-always-baseline js/src/jit-test/tests/asm.js/testCaching.js js/src/jit-test/tests/asm.js/testCloning.js --wasm-always-baseline js/src/jit-test/tests/asm.js/testCloning.js js/src/jit-test/tests/asm.js/testBullet.js --wasm-always-baseline js/src/jit-test/tests/asm.js/testBullet.js js/src/jit-test/tests/asm.js/testHeapAccess.js --wasm-always-baseline js/src/jit-test/tests/asm.js/testHeapAccess.js js/src/jit-test/tests/asm.js/testSource.js --wasm-always-baseline js/src/jit-test/tests/asm.js/testSource.js js/src/jit-test/tests/asm.js/testStackWalking.js --wasm-always-baseline js/src/jit-test/tests/asm.js/testStackWalking.js js/src/jit-test/tests/latin1/asm.js which points at * thread #1: tid = 101293, 0x0000000000438c1f js`ShellOpenAsmJSCacheEntryForWrite(global=<unavailable>, installed=<unavailable>, begin=<unavailable>, end=<unavailable>, serializedSize=5216, memoryOut=0x00007fffffffbab0, handleOut=0x0000000802ba5c6a) + 255 at js.cpp:6850, stop reason = signal SIGSEGV: address access protected (fault address: 0x801d37000) frame #0: 0x0000000000438c1f js`ShellOpenAsmJSCacheEntryForWrite(global=<unavailable>, installed=<unavailable>, begin=<unavailable>, end=<unavailable>, serializedSize=5216, memoryOut=0x00007fffffffbab0, handleOut=0x0000000802ba5c6a) + 255 at js.cpp:6850 6847 6848 // The embedding added the cookie so strip it off of the buffer returned to 6849 // the JS engine. The asmJSCacheCookie will be written on close, below. -> 6850 MOZ_ASSERT(*(uint32_t*)memory == 0); 6851 *memoryOut = (uint8_t*)memory + sizeof(uint32_t); 6852 *handleOut = fd.forget(); 6853 return JS::AsmJSCache_Success;

Comment on attachment 8796886 [details] Bug 1306913 - Allow MOZ_ASSERT to check contents before disabling PROT_READ. https://reviewboard.mozilla.org/r/82592/#review81404 Oh wow, that's a pretty silly bug, thanks! I guess FreeBSD is the only OS to prevent reads when only PROT_WRITE?

(In reply to Luke Wagner [:luke] from comment #2) > FreeBSD is the only OS to prevent reads when only PROT_WRITE? No, write() to stdout succeeds but dereferencing crashes. This also happens at least on DragonFly and OpenBSD. -fsanitize=address shows something but not enough without symbols.

Pushed by cbook@mozilla.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/5a0c00314737 Allow MOZ_ASSERT to check contents before disabling PROT_READ. r=luke