I've crashed several times today in my normal profile, normally I almost never crash. I didn't have a problem with the 2011-09-18 nightly. The 2011-09-20 has the crashes (I'm unsure about 2011-09-19, I may have skipped it, I don't remember). I seem to be able to reproduce eventually by going to http://www.flickr.com/photos/lucasrocha/sets/72157627529094579/ and then ctrl-clicking on each image to open in a new tab. I reproduced in a opt build with debug enabled (rev b15856d4b114) and got this stack: #0 0x00007ffff463ec0a in setRel32 (jump=..., destination=<value optimized out>) at ../../../js/src/assembler/assembler/X86Assembler.h:2523 #1 relinkJump (jump=..., destination=<value optimized out>) at ../../../js/src/assembler/assembler/X86Assembler.h:2401 #2 JSC::AbstractMacroAssembler<JSC::X86Assembler>::repatchJump (jump=..., destination=<value optimized out>) at ../../../js/src/assembler/assembler/AbstractMacroAssembler.h:615 #3 0x00007ffff4652475 in relink (this=<value optimized out>, cs=...) at ../../../js/src/assembler/assembler/RepatchBuffer.h:80 #4 GetPropCompiler::patchPreviousToHere (this=<value optimized out>, cs=...) at /home/tim/ffopen/src/js/src/methodjit/PolyIC.cpp:1372 #5 0x00007ffff4653819 in GetPropCompiler::linkerEpilogue ( this=0x7fffffff4c20, buffer=..., start=<value optimized out>, shapeMismatches=...) at /home/tim/ffopen/src/js/src/methodjit/PolyIC.cpp:1342 #6 0x00007ffff4655faf in GetPropCompiler::generateGetterStub ( this=0x7fffffff4c20, masm=<value optimized out>, shape=0x7fffd8ef2fc0, start=..., shapeMismatches=...) at /home/tim/ffopen/src/js/src/methodjit/PolyIC.cpp:1244 #7 0x00007ffff4659236 in GetPropCompiler::generateStub (this=0x7fffffff4c20, holder=0x7fffd8eeb558, shape=0x7fffd8ef2fc0) at /home/tim/ffopen/src/js/src/methodjit/PolyIC.cpp:1302 #8 0x00007ffff4659723 in GetPropCompiler::update (this=0x7fffffff4c20) at /home/tim/ffopen/src/js/src/methodjit/PolyIC.cpp:1394 #9 0x00007ffff464f410 in js::mjit::ic::GetProp (f=..., pic=0x7fff828e82c8) at /home/tim/ffopen/src/js/src/methodjit/PolyIC.cpp:1992 #10 0x00007fff55a2efd0 in ?? () #11 0x00007fff55a2ebc0 in ?? () #12 0x000000004e795ef6 in ?? () #13 0x00007fffffff5290 in ?? () #14 0x0000000000000000 in ?? () I've also crashed without loading a bazillion tabs with images. (I'm 64bit, so I don't think I'm hitting OOM.)
Brian, if I had a guess, the new getter IC is missing a verifyRange change in the linker.
Created attachment 561381 [details] [diff] [review] patch Yes, this is the problem. The getter IC only verified range against the JITScript's code, and not the previous PIC stub.