Crash Dump Analysis Patterns (Part 140)

In this part we introduce Coupled Modules pattern. Often we identify a pattern that points to a particular module such as a driver or DLL other modules could use functional services from and, therefore, the latter modules can be implicated in abnormal software behavior. For example, detected insufficient kernel paged pool memory pointed to a driver that owns a pool tag DRV:

1: kd> !poolused 4
   Sorting by  Paged Pool Consumed

 Tag    Allocs    Frees     Diff     Used  
 DRV   1466496  1422361    44135  188917256  UNKNOWN pooltag ‘DRV ‘, please update pooltag.txt
 File  6334830  6284036    50794    6735720  File objects
 Thre    53721    45152     8569    4346432  Thread objects , Binary: nt!ps

This module is known to be a directing module to other drivers (from stack trace perspective) but we also know that other (directed) modules use its services that require memory allocation.

- Dmitry Vostokov @ + -

One Response to “Crash Dump Analysis Patterns (Part 140)”

  1. Dmitry Vostokov Says:

    We can also see if 2 modules are coupled statically by examining their import tables (!dh).

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