42710 2010-07-20 16:02:56 -0700 Assertion in Connection::readEventHandler when launching WebKitTestRunner 2010-07-21 13:25:58 -0700 1 1 1 Unclassified WebKit WebKit2 528+ (Nightly build) PC Windows XP RESOLVED FIXED InRadar, PlatformOnly P2 Normal --- 1 aroben webkit-unassigned andersca sam oldest_to_newest 254041 0 aroben 2010-07-20 16:02:56 -0700 To reproduce: 1. run-webkit-tests --webkit-test-runner You'll hit an ASSERT_NOT_REACHED() on launch in Connection::readEventHandler because GetOverlappedResult returned FALSE and GetLastError returned ERROR_MORE_DATA. 254044 1 aroben 2010-07-20 16:03:11 -0700 <rdar://problem/8197571> 254280 2 aroben 2010-07-21 07:59:00 -0700 MSDN says: The results reported by the GetOverlappedResult function are those of the specified handle's last overlapped operation to which the specified OVERLAPPED structure was provided, and for which the operation's results were pending. <http://msdn.microsoft.com/en-us/library/ms683209(VS.85).aspx> and: If a named pipe is being read in message mode and the next message is longer than the nNumberOfBytesToRead parameter specifies, ReadFile returns FALSE and GetLastError returns ERROR_MORE_DATA. The remainder of the message can be read by a subsequent call to the ReadFile or PeekNamedPipe function. <http://msdn.microsoft.com/en-us/library/aa365467(VS.85).aspx> So we must be sending a message that's more than inlineMessageMaxSize (4096) bytes. 254282 3 aroben 2010-07-21 08:01:12 -0700 Indeed, we're sending a message that's 9128 bytes. 254289 4 aroben 2010-07-21 08:10:33 -0700 I added an (incorrect, but useful for debugging) assertion to Connection::sendOutGoingMessage: ASSERT(arguments->bufferSize() < inlineMessageMaxSize); This assertion does get hit. It looks like the message being sent has an ID of 0x00050003, which I think corresponds to WebProcessProxyMessage::PostMessage. Sam thinks that this is likely the render tree dump being sent from the web process to the UI process. 254422 5 aroben 2010-07-21 10:58:40 -0700 I think our existing ReadFile code is a little wrong. MSDN says: Use NULL for [lpNumberOfBytesRead] if this is an asynchronous operation to avoid potentially erroneous results. <http://msdn.microsoft.com/en-us/library/aa365467(VS.85).aspx> But we're not doing that. I think we're supposed to call GetOverlappedResult to get the number of bytes read even if ReadFile returns TRUE. 254477 6 62224 aroben 2010-07-21 13:04:30 -0700 Created attachment 62224 Patch 254489 7 aroben 2010-07-21 13:25:58 -0700 Committed r63852: <http://trac.webkit.org/changeset/63852> 62224 2010-07-21 13:04:30 -0700 2010-07-21 13:13:17 -0700 Patch bug-42710-20100721160436.patch text/plain 9053 aroben ZGlmZiAtLWdpdCBhL1dlYktpdDIvQ2hhbmdlTG9nIGIvV2ViS2l0Mi9DaGFuZ2VMb2cKaW5kZXgg ODhiYmZkMGI0ZmM5YTkyMGY3ZGUzYzJjNTVjODlhNWY2Y2M1MDc1ZS4uYTcwZjdlNDhjN2I2MDAz MzkwNGMwMTNjYjIwMzk4NWY0ZjFkMDI4NSAxMDA2NDQKLS0tIGEvV2ViS2l0Mi9DaGFuZ2VMb2cK KysrIGIvV2ViS2l0Mi9DaGFuZ2VMb2cKQEAgLTEsNSArMSw1NCBAQAogMjAxMC0wNy0yMSAgQWRh bSBSb2JlbiAgPGFyb2JlbkBhcHBsZS5jb20+CiAKKyAgICAgICAgVGVhY2ggQ29yZUlQQyBob3cg dG8gaGFuZGxlIG1lc3NhZ2VzIHRoYXQgYXJlIGxhcmdlciB0aGFuIHRoZSBwaXBlJ3MKKyAgICAg ICAgYnVmZmVyCisKKyAgICAgICAgOjpHZXRPdmVybGFwcGVkUmVzdWx0IGFuZCA6OlJlYWRGaWxl 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