https://bugs.winehq.org/show_bug.cgi?id=26044
--- Comment #9 from Austin English austinenglish@gmail.com --- Still seeing this in 4.0-rc3: ==31033== Syscall param writev(vector[...]) points to uninitialised byte(s) ==31033== at 0x43567D3: writev (writev.c:26) ==31033== by 0x7BC75457: send_request (server.c:228) ==31033== by 0x7BC76158: server_call_unlocked (server.c:288) ==31033== by 0x7BC761AD: wine_server_call (server.c:321) ==31033== by 0x52278D8: set_window_pos (winpos.c:2158) ==31033== by 0x5229850: USER_SetWindowPos (winpos.c:2314) ==31033== by 0x5227E66: SetWindowPos (winpos.c:2404) ==31033== by 0x605206C: activate_inplace (oleobject.c:175) ==31033== by 0x6052398: OleObject_DoVerb (oleobject.c:673) ==31033== by 0x4B87BB5: IOleObject_DoVerb (oleidl.h:2756) ==31033== by 0x4B87BB5: IOCS_Init (???:0) ==31033== by 0x4B87D1A: IOCS_Create (atl_ax.c:970) ==31033== by 0x4B88402: AtlAxAttachControl (atl_ax.c:1156) ==31033== by 0x42280A2: test_AtlAxAttachControl (atl_ax.c:101) ==31033== by 0x42282A7: func_atl_ax (atl_ax.c:142) ==31033== by 0x422957F: run_test (test.h:617) ==31033== by 0x4229FBD: main (test.h:701) ==31033== Address 0x4b6f9f8 is on thread 1's stack ==31033== in frame #4, created by set_window_pos (winpos.c:2095) ==31033== Uninitialised value was created by a stack allocation ==31033== at 0x4B87B5B: IOCS_Init (atl_ax.c:926) ==31033==