144924 2015-05-12 12:41:58 -0700 Windows: Cannot use HANDLE from GetCurrentThread() to get the CONTEXT of another thread 2019-09-25 09:41:27 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 144925 1 mark.lam mark.lam benjamin bfulgham computertechreviews19 fpizlo ggaren mmirman msaboff webkit-bug-importer oldest_to_newest 1094234 0 mark.lam 2015-05-12 12:41:58 -0700 The present stack scanning code in the Windows port is expecting that the GetCurrentThread() API will provide a unique HANDLE for each thread. The code then saves and later uses that HANDLE with GetThreadContext() to get the runtime state of the target thread from the GC thread. According to https://msdn.microsoft.com/en-us/library/windows/desktop/ms683182(v=vs.85).aspx, GetCurrentThread() does not provide this unique HANDLE that we expect: "The function cannot be used by one thread to create a handle that can be used by other threads to refer to the first thread. The handle is always interpreted as referring to the thread that is using it. A thread can create a "real" handle to itself that can be used by other threads, or inherited by other processes, by specifying the pseudo handle as the source handle in a call to the DuplicateHandle function.” As a result of this, GetCurrentThread() always returns the same HANDLE value, and we end up never scanning the stacks of other threads because we wrongly think that they are all equal (in identity) to the scanning thread. This, in turn, results in crashes due objects that are incorrectly collected. 1094243 1 mark.lam 2015-05-12 12:54:53 -0700 <rdar://problem/18736465> 1094244 2 webkit-bug-importer 2015-05-12 12:55:26 -0700 <rdar://problem/20922230> 1094284 3 252987 mark.lam 2015-05-12 14:48:14 -0700 Created attachment 252987 the patch. Uploading the patch for testing. Not ready for review yet. 1094293 4 252991 mark.lam 2015-05-12 15:11:26 -0700 Created attachment 252991 patch 2: fixed Windows build problem. 1094340 5 253001 mark.lam 2015-05-12 18:27:03 -0700 Created attachment 253001 patch 3: Fixed a ChangeLog comment. It's ready for review now. 1094341 6 mark.lam 2015-05-12 18:27:47 -0700 <rdar://problem/20922230> 1094342 7 mark.lam 2015-05-12 18:27:58 -0700 <rdar://problem/18736465> 1094352 8 253001 achristensen 2015-05-12 18:45:43 -0700 Comment on attachment 253001 patch 3: Fixed a ChangeLog comment. View in context: https://bugs.webkit.org/attachment.cgi?id=253001&action=review > Source/JavaScriptCore/ChangeLog:20 > + handle as the source handle in a call to the DuplicateHandle function.” non-ASCII character 1094357 9 mark.lam 2015-05-12 18:49:45 -0700 Thanks for the review. Landed in r184229: <http://trac.webkit.org/r184229>. 1094481 10 253001 ggaren 2015-05-13 10:22:34 -0700 Comment on attachment 253001 patch 3: Fixed a ChangeLog comment. View in context: https://bugs.webkit.org/attachment.cgi?id=253001&action=review > Source/JavaScriptCore/heap/MachineStackMarker.cpp:246 > +#if OS(WINDOWS) > + HANDLE platformThreadHandle; > +#endif Should we change the type of PlatformThread in WTF? Might other uses of PlatformThread have this bug? 1094494 11 mark.lam 2015-05-13 11:04:09 -0700 (In reply to comment #10) > Comment on attachment 253001 [details] > patch 3: Fixed a ChangeLog comment. > > View in context: > https://bugs.webkit.org/attachment.cgi?id=253001&action=review > > > Source/JavaScriptCore/heap/MachineStackMarker.cpp:246 > > +#if OS(WINDOWS) > > + HANDLE platformThreadHandle; > > +#endif > > Should we change the type of PlatformThread in WTF? Might other uses of > PlatformThread have this bug? I just did a grep throughout Source and didn’t see any references to any PlatformThread other than in MachineStackMarker. In WTF, there’s a PlatformThreadSpecificKey, but that’s a different mechanism. I also grep’ed for uses of the problematic GetCurrentThread(), and the only other use of it is in WTF/wtf/CurrentTime.cpp, and it’s using it correctly. So, I think there’s no outstanding issue. 252987 2015-05-12 14:48:14 -0700 2015-05-12 15:11:26 -0700 the patch. bug-144924.patch text/plain 5456 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTg0MjIxKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDQyIEBA CisyMDE1LTA1LTEyICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBX aW5kb3dzOiBDYW5ub3QgdXNlIEhBTkRMRSBmcm9tIEdldEN1cnJlbnRUaHJlYWQoKSB0byBnZXQg dGhlIENPTlRFWFQgb2YgYW5vdGhlciB0aHJlYWQuCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJr aXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xNDQ5MjQKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JP RFkgKE9PUFMhKS4KKworICAgICAgICBUaGUgcHJlc2VudCBzdGFjayBzY2FubmluZyBjb2RlIGlu IHRoZSBXaW5kb3dzIHBvcnQgaXMgZXhwZWN0aW5nIHRoYXQgdGhlCisgICAgICAgIEdldEN1cnJl bnRUaHJlYWQoKSBBUEkgd2lsbCBwcm92aWRlIGEgdW5pcXVlIEhBTkRMRSBmb3IgZWFjaCB0aHJl 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