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- The lkdtm module provides an interface to crash or injure the kernel at
- predefined crashpoints to evaluate the reliability of crash dumps obtained
- using different dumping solutions. The module uses KPROBEs to instrument
- crashing points, but can also crash the kernel directly without KRPOBE
- support.
- You can provide the way either through module arguments when inserting
- the module, or through a debugfs interface.
- Usage: insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<>
- [cpoint_count={>0}]
- recur_count : Recursion level for the stack overflow test. Default is 10.
- cpoint_name : Crash point where the kernel is to be crashed. It can be
- one of INT_HARDWARE_ENTRY, INT_HW_IRQ_EN, INT_TASKLET_ENTRY,
- FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_DISPATCH_CMD,
- IDE_CORE_CP, DIRECT
- cpoint_type : Indicates the action to be taken on hitting the crash point.
- It can be one of PANIC, BUG, EXCEPTION, LOOP, OVERFLOW,
- CORRUPT_STACK, UNALIGNED_LOAD_STORE_WRITE, OVERWRITE_ALLOCATION,
- WRITE_AFTER_FREE,
- cpoint_count : Indicates the number of times the crash point is to be hit
- to trigger an action. The default is 10.
- You can also induce failures by mounting debugfs and writing the type to
- <mountpoint>/provoke-crash/<crashpoint>. E.g.,
- mount -t debugfs debugfs /mnt
- echo EXCEPTION > /mnt/provoke-crash/INT_HARDWARE_ENTRY
- A special file is `DIRECT' which will induce the crash directly without
- KPROBE instrumentation. This mode is the only one available when the module
- is built on a kernel without KPROBEs support.
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