41641 2010-07-05 15:00:19 -0700 Update compile flags to allow use of ExecutableAllocatorFixedVMPool on platforms other than x86-64 2010-07-08 11:58:53 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) PC OS X 10.5 RESOLVED FIXED P2 Normal --- 41679 41686 1 barraclough barraclough abarth eric ossy webkit.review.bot xan.lopez zherczeg oldest_to_newest 246793 0 barraclough 2010-07-05 15:00:19 -0700 This may be useful on 32-bit platforms, too. 246795 1 60570 barraclough 2010-07-05 15:06:55 -0700 Created attachment 60570 The patch The constants VM_POOL_SIZE & COALESCE_LIMIT will require some tuning, have put in some hopefully sensible starting points. This patch is a cleanup that should not change the behaviour on any platform. 246815 2 webkit.review.bot 2010-07-05 18:21:51 -0700 http://trac.webkit.org/changeset/62511 might have broken SnowLeopard Intel Release (Tests) 246866 3 barraclough 2010-07-05 22:55:07 -0700 fixed in r62511 247019 4 xan.lopez 2010-07-06 04:36:21 -0700 I rolled this out because it breaks Linux/64bit. I'm unsure of what we are supposed to do, since ExecutableAllocatorPosix.cpp is now defined only for 32bit, and ExecutableAllocatorFixedVMPool.cpp is Darwin-only atm. 247021 5 mrowe 2010-07-06 04:43:00 -0700 Xan, if this was rolled out you need to do two things: 1) Mention the revision number in which it was rolled out. 2) Reopen the bug. If the change is no longer in the tree then the bug clearly isn’t “fixed”. 247027 6 xan.lopez 2010-07-06 05:10:35 -0700 Sorry, for some reason thought the bot had reopened it. The bug is linked in the 'Depends on' list though, revision where this was rolled out is r62544. 247646 7 barraclough 2010-07-07 11:11:26 -0700 I hadn't realized the JIT had been enabled on x86-64 Linux using the posix allocator - this is terribly unsafe, we should only be using the fixed pool allocator on 64bit (due to a branch range issue). However this is also implemented in terms of posix mmap/munmap, so should work on Linux too. Do you know what the problem is here? - is it just missing arc4random? - if so, we can just disable the ASLR on !OS(DARWIN) platforms. 247850 8 xan.lopez 2010-07-07 16:45:40 -0700 (In reply to comment #7) > I hadn't realized the JIT had been enabled on x86-64 Linux using the posix allocator - this is terribly unsafe, we should only be using the fixed pool allocator on 64bit (due to a branch range issue). However this is also implemented in terms of posix mmap/munmap, so should work on Linux too. Do you know what the problem is here? - is it just missing arc4random? - if so, we can just disable the ASLR on !OS(DARWIN) platforms. Oh, I haven't tried to actually compile the file. Just saw that it used to be guarded by OS(DARWIN) and has mach headers, so it won't compile on Linux out of the box. If the right thing to do is use this I can try to get it into shape. 248031 9 zherczeg 2010-07-07 23:17:51 -0700 Exactly, arc4random is missing. In Qt-Linux 64, mmap with 0 address works fine, and not sure what is the advantage of forcing a custom address space (anyway an idea: since the random address space may collide with something else, you could encolse it in a loop, and could try 3 or 4 times with different random values before crash with out of memory) Anyway, that patch was rolled out, so you can incorporate this fix into that patch before landing again. 248397 10 barraclough 2010-07-08 11:55:22 -0700 *** Bug 41679 has been marked as a duplicate of this bug. *** 248400 11 barraclough 2010-07-08 11:58:53 -0700 Relanded in 62799, GTK fixes in 62806, 62811. 60570 2010-07-05 15:06:55 -0700 2010-07-05 15:56:34 -0700 The patch patch.executableAllocatorFixed.txt text/plain 9177 barraclough SW5kZXg6IEphdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBKYXZhU2NyaXB0 Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDYyNTA5KQorKysgSmF2YVNjcmlwdENvcmUvQ2hhbmdl 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