128537 2014-02-10 09:20:28 -0800 Dedicated worker crash caused by global DFG worklists + GC 2014-02-19 11:09:53 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED InRadar P2 Normal --- 1 fpizlo mhahnenberg ap barraclough commit-queue fpizlo ggaren mark.lam mhahnenberg mmirman msaboff oliver sam webkit-bug-importer oldest_to_newest 978911 0 fpizlo 2014-02-10 09:20:28 -0800 http://build.webkit.org/results/Apple%20Mavericks%20Debug%20WK1%20(Tests)/r163786%20(2787)/fast/workers/dedicated-worker-lifecycle-crash-log.txt 978915 1 fpizlo 2014-02-10 09:26:46 -0800 This allegedly began with: http://trac.webkit.org/log/?verbose=on&rev=163691&stop_rev=163691 But the assertion failure is: ASSERTION FAILED: m_totalBytesCopied <= m_storageSpace.size() This implies a long-standing GC copying bug. 978924 2 fpizlo 2014-02-10 09:32:47 -0800 Skipped in r163791 979780 3 ap 2014-02-11 22:42:45 -0800 <rdar://problem/16045493> 982174 4 mhahnenberg 2014-02-18 17:11:43 -0800 (In reply to comment #1) > This allegedly began with: > > http://trac.webkit.org/log/?verbose=on&rev=163691&stop_rev=163691 > > But the assertion failure is: > > ASSERTION FAILED: m_totalBytesCopied <= m_storageSpace.size() > > This implies a long-standing GC copying bug. After some investigation, it appears that the process-global DFG worklists are causing objects to participate in the garbage collections of VMs other than the one they were allocated in. This started manifesting in the worker tests because they're one of the few WebKit tests that do multithreaded JS. 982175 5 fpizlo 2014-02-18 17:15:04 -0800 (In reply to comment #4) > (In reply to comment #1) > > This allegedly began with: > > > > http://trac.webkit.org/log/?verbose=on&rev=163691&stop_rev=163691 > > > > But the assertion failure is: > > > > ASSERTION FAILED: m_totalBytesCopied <= m_storageSpace.size() > > > > This implies a long-standing GC copying bug. > > After some investigation, it appears that the process-global DFG worklists are causing objects to participate in the garbage collections of VMs other than the one they were allocated in. This started manifesting in the worker tests because they're one of the few WebKit tests that do multithreaded JS. Whoa! That's pretty awesome. So, the fix is just for the following methods: bool isActive() const { return !!m_plans.size(); } void visitChildren(SlotVisitor&, CodeBlockSet&); // Only called on the main thread after suspending all threads. to filter based on VM. That implies passing the VM& in each of them. That also means that: void suspendAllThreads(); void resumeAllThreads(); need to be smart enough to not allow "double suspension" of threads. Or to handle it gracefully. You could accomplish that super easily by having an internal Mutex that suspendAllThreads() locks before doing anything else, and resumeAllThreads() unlocks after. 982193 6 224574 mhahnenberg 2014-02-18 18:31:19 -0800 Created attachment 224574 Patch 982411 7 224574 commit-queue 2014-02-19 10:36:10 -0800 Comment on attachment 224574 Patch Clearing flags on attachment: 224574 Committed r164371: <http://trac.webkit.org/changeset/164371> 982412 8 commit-queue 2014-02-19 10:36:13 -0800 All reviewed patches have been landed. Closing bug. 982449 9 mhahnenberg 2014-02-19 11:09:53 -0800 *** Bug 128745 has been marked as a duplicate of this bug. *** 224574 2014-02-18 18:31:19 -0800 2014-02-19 10:36:10 -0800 Patch bug-128537-20140218183104.patch text/plain 7356 mhahnenberg SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTY0MzQzKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDMwIEBA CisyMDE0LTAyLTE4ICBNYXJrIEhhaG5lbmJlcmcgIDxtaGFobmVuYmVyZ0BhcHBsZS5jb20+CisK KyAgICAgICAgRGVkaWNhdGVkIHdvcmtlciBjcmFzaCBjYXVzZWQgYnkgZ2xvYmFsIERGRyB3b3Jr bGlzdHMgKyBHQworICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/ aWQ9MTI4NTM3CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAg ICAgVGhlIHByb2Nlc3MtZ2xvYmFsIERGRyB3b3JrbGlzdHMgd2VyZSBjYXVzaW5nIG9iamVjdHMg 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