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Diffstat (limited to 'Documentation/fault-injection/provoke-crashes.txt')
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diff --git a/Documentation/fault-injection/provoke-crashes.txt b/Documentation/fault-injection/provoke-crashes.txt new file mode 100644 index 000000000000..7a9d3d81525b --- /dev/null +++ b/Documentation/fault-injection/provoke-crashes.txt | |||
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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. | ||