drmemory -verify_sysnums failure on handle test

_From [zhao...@google.com](https://code.google.com/u/106321947286816917100/) on April 16, 2014 18:31:37_

$ ./bin/drmemory.exe -dr_ops "-msgbox_mask 0x0" -verify_sysnums -pause_at_assert -- ./tests/handle.exe
WARNING: using debug DynamoRIO since release not found

...
~~Dr.M~~ Dr. Memory version 1.6.1885
~~Dr.M~~ Running "./tests/handle.exe"
~~Dr.M~~ ASSERT FAILURE (thread 13704): D:\src\cygwin\home\zhaoqin\Workspace\DrMemory\drmemory.git\drsyscall\drsyscall_windows.c:3667: !ok || drsys_sysnums_equal(&syslist->num, &num_from_wrapper) (sysnum table does not match wrapper)

0:000> kp
ChildEBP RetAddr
00bfd920 5b94253e ntdll!NtRaiseHardError+0x12
00bfd970 5b8f42fe dynamorio!nt_messagebox(unsigned short \* msg = 0x00bfd988, unsigned short \* title = 0x5ba2f7fc)+0xfe [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\dynamorio\core\win32\ntdll.c @ 3676]
00bff190 739d21b7 dynamorio!dr_messagebox(char \* fmt = 0x73bb8534 "%s in pid %d", char \* ap = 0x00bff19c "D???")+0xee [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\dynamorio\core\x86\instrument.c @ 4006]
00bff1a4 739d21e8 drmemorylib!wait_for_user(char \* message = 0x73bb8544 "Dr. Memory is paused at an assert")+0x17 [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\common\utils.c @ 103]
00bff1b0 73a2f03d drmemorylib!drmemory_abort(void)+0x18 [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\common\utils.c @ 127]
00bff1ec 73a2ed27 drmemorylib!check_syscall_entry(void \* drcontext = 0x17dca780, struct _module_data_t \* info = 0x17d84e90, struct _syscall_info_t \* syslist = 0x73c61cd4, char \* optional_prefix = 0x73c06bd8 "NtGdi")+0x30d [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\drsyscall\drsyscall_windows.c @ 3667]
00bff20c 73a2b1f5 drmemorylib!drsyscall_os_module_load(void \* drcontext = 0x17dca780, struct _module_data_t \* info = 0x17d84e90, char loaded = 1 '')+0x1b7 [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\drsyscall\drsyscall_windows.c @ 3895]
00bff220 73a0d3bd drmemorylib!syscall_module_load(void \* drcontext = 0x17dca780, struct _module_data_t \* info = 0x17d84e90, char loaded = 1 '')+0x15 [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\drsyscall\drsyscall.c @ 2011]
00bff38c 5b8f0418 drmemorylib!drmgr_modload_event(void \* drcontext = 0x17dca780, struct _module_data_t \* info = 0x17d84e90, char loaded = 1 '')+0x8d [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\dynamorio\ext\drmgr\drmgr.c @ 1286]
00bff3c8 5b8ed42c dynamorio!instrument_module_load(struct _module_data_t \* data = 0x17d84e90, char previously_loaded = 1 '')+0xb8 [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\dynamorio\core\x86\instrument.c @ 1833]
00bff3ec 5b6aa6b5 dynamorio!instrument_init(void)+0x12c [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\dynamorio\core\x86\instrument.c @ 607]
00bffcb0 5b8cd8b1 dynamorio!dynamorio_app_init(void)+0x555 [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\dynamorio\core\dynamo.c @ 640]
00bffd10 5b8d5168 dynamorio!auto_setup(unsigned int appstack = 0xbffd1c)+0x21 [d:\src\cygwin\home\zhaoqin\workspace\drmemory\drmemory.git\dynamorio\core\x86\x86_code.c @ 148]
00000000 00000000 dynamorio!dynamo_auto_start(void)+0x8 [D:\src\cygwin\home\zhaoqin\Workspace\DrMemory\builds\build_x86_drm_dbg.git\dynamorio\core\CMakeFiles\dynamorio.dir\x86\x86.asm.obj.s @ 1042]

0:000> dt syslist
Local var @ 0xbff1fc Type _syscall_info_t*
0x73c61cd4
+0x000 num : _drsys_sysnum_t
+0x008 name : 0x73c4f500 "NtGdiOpenDCW"
+0x00c flags : 1
+0x010 return_type : 7
+0x014 arg_count : 7
+0x018 arg : [18] _sysinfo_arg_t
+0x138 num_out : (null)
0:000> ?? syslist->name
char \* 0x73c4f500
"NtGdiOpenDCW"
0:000> ?? syslist->num
struct _drsys_sysnum_t
+0x000 number : 0
+0x004 secondary : 52
0:000> ?? num_from_wrapper
struct _drsys_sysnum_t
+0x000 number : 4314
+0x004 secondary : 0

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=1521_

Start by reproducing the failure with ./bin/drmemory.exe -verify_sysnums -- ./tests/handle.exe, then inspect drsyscall/drsyscall_windows.c around check_syscall_entry at line 3667 and the NtGdiOpenDCW data shown in the report. Done means the handle test no longer triggers the sysnum-table assertion with verification enabled.

Written by the indexing model from the issue text.