49 lines
1.5 KiB
ReStructuredText
49 lines
1.5 KiB
ReStructuredText
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===============
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Provoke crashes
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===============
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The lkdtm module provides an interface to crash or injure the kernel at
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predefined crashpoints to evaluate the reliability of crash dumps obtained
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using different dumping solutions. The module uses KPROBEs to instrument
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crashing points, but can also crash the kernel directly without KRPOBE
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support.
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You can provide the way either through module arguments when inserting
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the module, or through a debugfs interface.
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Usage::
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insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<>
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[cpoint_count={>0}]
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recur_count
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Recursion level for the stack overflow test. Default is 10.
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cpoint_name
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Crash point where the kernel is to be crashed. It can be
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one of INT_HARDWARE_ENTRY, INT_HW_IRQ_EN, INT_TASKLET_ENTRY,
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FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_DISPATCH_CMD,
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IDE_CORE_CP, DIRECT
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cpoint_type
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Indicates the action to be taken on hitting the crash point.
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It can be one of PANIC, BUG, EXCEPTION, LOOP, OVERFLOW,
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CORRUPT_STACK, UNALIGNED_LOAD_STORE_WRITE, OVERWRITE_ALLOCATION,
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WRITE_AFTER_FREE,
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cpoint_count
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Indicates the number of times the crash point is to be hit
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to trigger an action. The default is 10.
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You can also induce failures by mounting debugfs and writing the type to
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<mountpoint>/provoke-crash/<crashpoint>. E.g.::
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mount -t debugfs debugfs /mnt
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echo EXCEPTION > /mnt/provoke-crash/INT_HARDWARE_ENTRY
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A special file is `DIRECT` which will induce the crash directly without
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KPROBE instrumentation. This mode is the only one available when the module
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is built on a kernel without KPROBEs support.
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