osk!__rt_sdiv_worker crash on ARM (triggered by RTC)

osk!_RTC_DefaultErrorFuncW+0x14:

001624d4 defe     __debugbreak

0:000> kp

 # Child-SP RetAddr  Call Site

00 007af2e8 0016276c osk!_RTC_DefaultErrorFuncW(int errType = 0n3, wchar_t * file = 0x00164814 "unknown file", int line = 0n-1, wchar_t * module = 0x001647f4 "unknown module", wchar_t * format = 0x00164830 "Use of uninitialized variable %S!.")+0x14 [sdk\lib\runtmchk\rtcapi.c @ 45]

01 007af310 001631ec osk!_RTC_UninitUse(char * _Varname = 0x00164a88 "dividend_sign")+0x30 [sdk\lib\runtmchk\rtcapi.c @ 124]

02 007af338 001630e2 osk!__rt_sdiv_worker(struct _ARM_DIVRESULT * result = 0x007af380, unsigned int divisor = 0x2c, unsigned int dividend = 0x58)+0xdc [sdk\lib\crt\math\arm\__rt_div_worker.h @ 102]

03 007af378 00161444 osk!__rt_sdiv(int divisor = 0n89, int dividend = 0n711)+0x22 [sdk\lib\crt\math\arm\__rt_sdiv.c @ 24]

04 007af3b8 00161698 osk!OSK_DlgInitDialog(struct HWND__ * hDlg = 0x0003022a)+0x154 [base\applications\osk\main.c @ 198]

05 007af4b8 771dcd10 osk!OSK_DlgProc(struct HWND__ * hDlg = 0x0003022a, unsigned int msg = 0x110, unsigned int wParam = 0x30266, long lParam = 0n0)+0x70 [base\applications\osk\main.c @ 592]