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Documentation / fault-injection / provoke-crashes.txt




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Based on kernel version 3.16. Page generated on 2014-08-06 21:39 EST.

1	The lkdtm module provides an interface to crash or injure the kernel at
2	predefined crashpoints to evaluate the reliability of crash dumps obtained
3	using different dumping solutions. The module uses KPROBEs to instrument
4	crashing points, but can also crash the kernel directly without KRPOBE
5	support.
6	
7	
8	You can provide the way either through module arguments when inserting
9	the module, or through a debugfs interface.
10	
11	Usage: insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<>
12					[cpoint_count={>0}]
13	
14	  recur_count : Recursion level for the stack overflow test. Default is 10.
15	
16	  cpoint_name : Crash point where the kernel is to be crashed. It can be
17		 one of INT_HARDWARE_ENTRY, INT_HW_IRQ_EN, INT_TASKLET_ENTRY,
18		 FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_DISPATCH_CMD,
19		 IDE_CORE_CP, DIRECT
20	
21	  cpoint_type : Indicates the action to be taken on hitting the crash point.
22	     It can be one of PANIC, BUG, EXCEPTION, LOOP, OVERFLOW,
23	     CORRUPT_STACK, UNALIGNED_LOAD_STORE_WRITE, OVERWRITE_ALLOCATION,
24	     WRITE_AFTER_FREE,
25	
26	  cpoint_count : Indicates the number of times the crash point is to be hit
27	    to trigger an action. The default is 10.
28	
29	You can also induce failures by mounting debugfs and writing the type to
30	<mountpoint>/provoke-crash/<crashpoint>. E.g.,
31	
32	  mount -t debugfs debugfs /mnt
33	  echo EXCEPTION > /mnt/provoke-crash/INT_HARDWARE_ENTRY
34	
35	
36	A special file is `DIRECT' which will induce the crash directly without
37	KPROBE instrumentation. This mode is the only one available when the module
38	is built on a kernel without KPROBEs support.
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