Running customer's application on 5.0u9 b01, Access Violation frequently occurs
This did not happen with 5.0u8 b03

Dump files for 1 run are attached to this bug report ( running with adplus -crash ). Screenshot is attached as well.

Test case is not available at the moment, but the customer is looking how to generate one.

Attached dump snapshots show access violation in the following threads consequently :

I.

ChildEBP RetAddr Args to Child
090bfbbc 77cf93f5 6d0e5b80 6d0e598d 08bef1d8 ntdll!KiFastSystemCallRet (FPO: [0,0,0])
090bfc00 0635832f 08bef298 090bfc3c 090bfc10 user32!NtUserWaitMessage+0xc
WARNING: Frame IP not in any known module. Following frames may be wrong.
090bfc2c 063529e3 00000000 06356509 21358538 0x635832f
090bfc64 06352ce9 00000000 21358538 00000001 0x63529e3
090bfc98 06350215 213895b8 08bef1d8 2b3e1d00 0x6352ce9
090bfcb4 061f6e84 090bfce8 090bfe8c 0000000a 0x6350215
090bfd30 0624dead 0000000a 00000000 090bfde4 jvm!JavaCalls::call_static+0x1a (CONV: cdecl) [C:/BUILD_AREA/jdk1.5.0_09/hotspot\src\share\vm\runtime\javaCalls.cpp @ 272]
090bfe24 7c9506eb 090bfde8 090bfe0c 00000001 jvm!os::current_thread_cpu_time+0x5 (FPO: [1,0,0]) (CONV: cdecl) [C:/BUILD_AREA/jdk1.5.0_09/hotspot\src\os\win32\vm\os_win32.cpp @ 3184]
090bfe30 00000001 00000008 00000000 090bfe94 ntdll!RtlAllocateHeap+0xeac (FPO: [Non-Fpo])

II.

ChildEBP RetAddr Args to Child
0012e688 6d40587e 08beee48 0964e4a8 0038df68 0x0
0012e6b4 6d401f60 00000001 0012e738 6d406951 jpiexp32!CJavaFrame::activate+0x11 [../../../../src/plugin/win32/com/common/CJavaFrame.cpp @ 272]
0012e730 77cf8709 0038dfb4 00000007 002303a0 jpiexp32!CAxControl::OnSetFocus+0x3f (FPO: [4,0,2]) [../../../../src/plugin/win32/com/iexplorer/AxControl.cpp @ 321]
0012e75c 77cf87eb 0038dfbc 00160532 00000007 user32!InternalCallWinProc+0x28
0012e7c4 77cfb368 00000000 0038dfbc 00160532 user32!UserCallWinProcCheckWow+0x150 (FPO: [Non-Fpo])
0012e818 77cfb3b4 006912e8 00000007 002303a0 user32!DispatchClientMessage+0xa3 (FPO: [Non-Fpo])
0012e840 7c94eae3 0012e850 00000018 006912e8 user32!__fnDWORD+0x24 (FPO: [Non-Fpo])
0012e864 77cfe5e8 6d40399a 00160532 00000000 ntdll!KiUserCallbackDispatcher+0x13 (FPO: [0,0,0])
0012e8d8 6d4027be fffffffc 0038df98 00000000 user32!NtUserSetFocus+0xc
Reproducible test case was provided by the customer and is attached: 20060815-CrashAndFreeze.zip