Fuzzing NtUserSBGetParms with ROCALL causes BSoD

 *** Fatal System Error: 0x0000007f

                       (0x0000000D,0x00000000,0x00000000,0x00000000)

Entered debugger on embedded INT3 at 0x0008:0x8058B77B.

kdb:> bt

Eip:

<ntoskrnl.exe:18b77c (home/runner/work/reactos/reactos/build/../src/sdk/lib/rtl/i386/debug_asm.S:56 (RtlpBreakWithStatusInstruction))>

Frames:

<ntoskrnl.exe:8c329 (ntoskrnl/ke/bug.c:1066 (KeBugCheckWithTf))>

<ntoskrnl.exe:148c5a (ntoskrnl/ke/i386/exp.c:1099 (KiSystemFatalException))>

<ntoskrnl.exe:14b46e (ntoskrnl/ke/i386/traphdlr.c:1212 (KiTrap0DHandler))>

<ntoskrnl.exe:3617 (:0 (KiTrap0D))>

<win32k.sys:7427c (win32ss/user/ntuser/scrollbar.c:1331 (NtUserSBGetParms))>

<ntoskrnl.exe:3fe5 (:0 (KiSystemCallTrampoline))>

<ntoskrnl.exe:14e739 (ntoskrnl/ke/i386/traphdlr.c:1840 (KiSystemServiceHandler))>

<ntoskrnl.exe:3e2f (:0 (KiFastCallEntry))>

<ntdll.dll:10181>

<ROCALL_checked.exe:1203>

<kernel32.dll:1c97b>

kdb:>