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Diffstat (limited to 'Documentation/fault-injection/fault-injection.rst')
| -rw-r--r-- | Documentation/fault-injection/fault-injection.rst | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/Documentation/fault-injection/fault-injection.rst b/Documentation/fault-injection/fault-injection.rst index 70380a2a01b4..8b8aeea71c68 100644 --- a/Documentation/fault-injection/fault-injection.rst +++ b/Documentation/fault-injection/fault-injection.rst @@ -141,6 +141,14 @@ configuration of fault-injection capabilities. default is 'Y', setting it to 'N' will also inject failures into highmem/user allocations (__GFP_HIGHMEM allocations). +- /sys/kernel/debug/failslab/cache-filter + Format: { 'Y' | 'N' } + + default is 'N', setting it to 'Y' will only inject failures when + objects are requests from certain caches. + + Select the cache by writing '1' to /sys/kernel/slab/<cache>/failslab: + - /sys/kernel/debug/failslab/ignore-gfp-wait: - /sys/kernel/debug/fail_page_alloc/ignore-gfp-wait: @@ -283,7 +291,7 @@ kernel may crash because it may not be able to handle the error. There are 4 types of errors defined in include/asm-generic/error-injection.h EI_ETYPE_NULL - This function will return `NULL` if it fails. e.g. return an allocateed + This function will return `NULL` if it fails. e.g. return an allocated object address. EI_ETYPE_ERRNO @@ -459,6 +467,18 @@ Application Examples losetup -d $DEVICE rm testfile.img +------------------------------------------------------------------------------ + +- Inject only skbuff allocation failures :: + + # mark skbuff_head_cache as faulty + echo 1 > /sys/kernel/slab/skbuff_head_cache/failslab + # Turn on cache filter (off by default) + echo 1 > /sys/kernel/debug/failslab/cache-filter + # Turn on fault injection + echo 1 > /sys/kernel/debug/failslab/times + echo 1 > /sys/kernel/debug/failslab/probability + Tool to run command with failslab or fail_page_alloc ---------------------------------------------------- |