141194 2015-02-03 00:54:48 -0800 Crash in JIT code 2015-02-03 17:13:02 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified NEW P2 Major --- 1 cwhan.tunz webkit-unassigned ggaren oldest_to_newest 1066387 0 cwhan.tunz 2015-02-03 00:54:48 -0800 ----------------- (function() { var a; (function() { for(var i = 0; i < 10000; i++); a })(); })(); ---------------- this code crahses. I cannot find the reason. Program received signal SIGSEGV, Segmentation fault. 0x00007fffb2a23bb0 in ?? () (gdb) bt #0 0x00007fffb2a23bb0 in ?? () #1 0x000000000000000a in ?? () #2 0x000000000000000a in ?? () #3 0x000000000000000a in ?? () #4 0x000000000000000a in ?? () #5 0x000000000000000a in ?? () #6 0x00007fffb01cff80 in ?? () #7 0x00007fffffffd610 in ?? () #8 0x00007ffff7c09fe8 in llint_entry () from /development/tunz/javascript/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18 Backtrace stopped: frame did not save the PC (gdb) x/i $pc => 0x7fffb2a23bb0: mov 0x20(%rax),%rax (gdb) i r rax rax 0xa 10 found with afl-fuzz 1066528 1 ap 2015-02-03 12:40:01 -0800 This test doesn't cause a crash on Mac for me. 1066653 2 cwhan.tunz 2015-02-03 17:13:02 -0800 It seems so.. I've tested it on Ubuntu 14.04.1, x86_64, gtk port.