The RTL_PROCESS_BACKTRACES structure is what a successful call to ZwQuerySystemInformation or NtQuerySystemInformation produces in its output buffer when given the information class SystemStackTraceInformation (0x0D).

Documentation Status

The RTL_PROCESS_BACKTRACES structure is not documented.

Microsoft does publish the practical equivalent of a C-language definition as type information in public symbol files, though not for the kernel, where the structure is prepared, nor even for low-level user-mode DLLs that interpret the structure, but for various higher-level user-mode DLLs such as URLMON.DLL and only then starting with version 6.2.

Two earlier disclosures of type information are known, though not in symbol files but in statically linked libraries: GDISRVL.LIB from the Device Driver Kit (DDK) for Windows NT 3.51; and SHELL32.LIB from the DDK for Windows NT 4.0.


The RTL_PROCESS_BACKTRACES is 0x9C or 0x0128 bytes in 32-bit and 64-bit Windows 10, respectively.

Offset (x86) Offset (x64) Definition
0x00 0x00
ULONG_PTR CommittedMemory;
0x04 0x08
ULONG_PTR ReservedMemory;
0x08 0x10
ULONG NumberOfBackTraceLookups;
0x0C 0x14
ULONG NumberOfBackTraces;
0x10 0x18

This is the structure for Windows 10. Earlier versions are known which have a smaller structure because the RTL_PROCESS_BACKTRACE_INFORMATION is smaller.