130295 2014-03-15 11:30:06 -0700 Crash beneath operationTearOffActivation running this JS compression demo 2014-03-20 13:54:24 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED http://nerget.com/compression/ InRadar P2 Normal --- 130440 1 oliver fpizlo atrick barraclough commit-queue fpizlo ggaren juergen mario mark.lam mhahnenberg mmirman nrotem oliver sam webkit-bug-importer oldest_to_newest 990879 0 oliver 2014-03-15 11:30:06 -0700 * STEPS TO REPRODUCE Steps to reproduce: 1. Go to http://nerget.com/compression/ 2. Select Order 2 (precise) 3. Hit compress <rdar://problem/16332337> Crash beneath operationTearOffActivation running this JS compression demo 991327 1 mark.lam 2014-03-17 11:50:05 -0700 The issue is above the LLINT and baselineJIT. If I disable the DFG, the issue does not manifest. Adding some printfs to the slow paths for creating and tearing off the activation, I see that on the DFG run, the activation is created by the LLINT, but at tear off time, it is seeing a bad activation pointer. 991331 2 mark.lam 2014-03-17 11:59:18 -0700 The added printfs say that the tear off (and manifestation of the issue) is being done in the baseline JIT. There was an OSR entry to DFG code, but it encountered a speculation check failure and OSR exited back to the baseline JIT where this issue manifested: Optimized decompress#EDGKb2:[0x7ff00ea3c6e0->0x7ff00ea30920->0x11605a970, NoneFunctionCall, 324] using DFGMode with DFG into 1706 bytes in 17.730957 ms. Speculation failure in decompress#EDGKb2:[0x7ff00ea3c6e0->0x7ff00ea30920->0x11605a970, DFGFunctionCall, 324] with executeCounter = 0.000000/3869.000000, -1000, reoptimizationRetryCounter = 1, optimizationDelayCounter = 5, osrExitCounter = 0 GPRs at time of exit: rax:0xffff0000fffffffe rdx:0xffff000000000002 rcx:0x36ba8c01ae9f rbx:0x7ff00bf00c18 rdi:0x1 rsi:0xe r8:0x7ff00bf00c18 r9:0x10b00db00 r10:0xeab3070d r12:0x7ff00eb01000 r13:0x5 FPRs at time of exit: xmm0:3fd77d0d45000000:0.367008 xmm1:4000000000000000:2.000000 xmm2:4330000000000000:4503599627370496.000000 xmm3:3fb8f6859999999a:0.097512 xmm4:40310628cbd1244a:17.024060 xmm5:ffffffff:0.000000 operationTearOffActivation @ exec 0x7fff5bc3a270 cb 0x7ff00ea30920 | 0xa | isOptimizing JIT NO 991421 3 mark.lam 2014-03-17 15:22:32 -0700 The offending code is in the OSR entry thunk. Dissecting the thunk now ... 992017 4 fpizlo 2014-03-18 21:51:10 -0700 This bug is awesome! The way we reason about flushing fails to cope with infinite loops - either ones that existed in the original code or ones that get created by way of CFG simplification. The best solution is probably to get CPS rethreading to inject flushes. This means that we handle flushes in the following way in the different forms: LoadStore: the bytecode is the ground truth of what is flushed. You can't trust Flushes. But, you know that anything that was flushed will be live-at-head in all of the right places. ThreadedCPS: Flushes are at any "terminals" blocks - that is, blocks that have no forward successors. SSA: no more Flushes! This is already in effect after https://bugs.webkit.org/show_bug.cgi?id=130440. 992368 5 227248 fpizlo 2014-03-19 19:51:30 -0700 Created attachment 227248 bunch of test cases 992384 6 fpizlo 2014-03-19 21:51:13 -0700 It's interesting how challenging this is! The whole point is that we're trying to insert Flush's at any point where execution could "end", which basically needs to include the end of any basic block that has no forward successors. But boy is that hard. Once we're in DFG SSA, it's easy, because by then, we don't have Flush's. But in CPS, it's kind of a poop show. - I cannot insert flushes in all of the right places prior to optimization unless I was conservative and inserted them in a *lot* of places, since at that point I don't know who might end up without forward successors. A looping branch might lose its forward successor due to an optimization, as the attached test cases illustrate. - I cannot insert all of the flushes after parsing because then I don't know exactly where it's OK to insert them. For example, we won't know when a SetLocal is an ImmediateSet and thus doesn't need a Flush. I'm starting to think that the bytecode parser ought to insert flushes "as if" we were returning at any backwards branch in addition to the places where it already does it. 992386 7 fpizlo 2014-03-19 21:54:09 -0700 Also found another bug, and I do intend to fix them as part of this patch, and hopefully have test cases too: InlineCallFrame::capturedVars is wrong for inlineDepth >= 2. 992387 8 227254 fpizlo 2014-03-19 21:56:53 -0700 Created attachment 227254 the wrong approach This tries to make it so that CPSRethreading blows away all Flush's and then inserts them by using bytecode as the ground truth. But I don't believe this will work. 992595 9 fpizlo 2014-03-20 11:10:54 -0700 (In reply to comment #7) > Also found another bug, and I do intend to fix them as part of this patch, and hopefully have test cases too: InlineCallFrame::capturedVars is wrong for inlineDepth >= 2. Nope, that wasn't a bug. That was just me misreading code. 992597 10 227305 fpizlo 2014-03-20 11:14:56 -0700 Created attachment 227305 hopefully the right approach 992599 11 commit-queue 2014-03-20 11:16:46 -0700 Attachment 227305 did not pass style-queue: ERROR: Source/JavaScriptCore/dfg/DFGGraph.h:783: The parameter name "flags" adds no information, so it should be removed. [readability/parameter_name] [5] Total errors found: 1 in 18 files If any of these errors are false positives, please file a bug against check-webkit-style. 992635 12 227313 fpizlo 2014-03-20 12:02:17 -0700 Created attachment 227313 the patch 992637 13 commit-queue 2014-03-20 12:03:48 -0700 Attachment 227313 did not pass style-queue: ERROR: Source/JavaScriptCore/dfg/DFGGraph.h:783: The parameter name "flags" adds no information, so it should be removed. [readability/parameter_name] [5] Total errors found: 1 in 20 files If any of these errors are false positives, please file a bug against check-webkit-style. 992651 14 bshafiei 2014-03-20 12:26:21 -0700 <rdar://problem/16332337> 992706 15 fpizlo 2014-03-20 13:54:24 -0700 Landed in http://trac.webkit.org/changeset/165995 227248 2014-03-19 19:51:30 -0700 2014-03-19 21:56:53 -0700 bunch of test cases blah.patch text/plain 7372 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9kZmcvREZHQ29tbW9uLmgKPT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQot LS0gU291cmNlL0phdmFTY3JpcHRDb3JlL2RmZy9ERkdDb21tb24uaAkocmV2aXNpb24gMTY1OTQx KQorKysgU291cmNlL0phdmFTY3JpcHRDb3JlL2RmZy9ERkdDb21tb24uaAkod29ya2luZyBjb3B5 KQpAQCAtMTAzLDcgKzEwMyw3IEBAIGVudW0gT3B0aW1pemF0aW9uRml4cG9pbnRTdGF0ZSB7IEJl Zm9yZUYKIC8vIERlc2NyaWJlcyB0aGUgZm9ybSB5b3UgY2FuIGV4cGVjdCB0aGUgZW50aXJlIGdy YXBoIHRvIGJlIGluLgogZW51bSBHcmFwaEZvcm0gewogICAgIC8vIExvYWRTdG9yZSBmb3JtIG1l 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