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Diffstat (limited to 'Documentation/dev-tools/kasan.rst')
| -rw-r--r-- | Documentation/dev-tools/kasan.rst | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst index 858c77fe7dc46c..d56f298a9d7cae 100644 --- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst @@ -277,6 +277,27 @@ traces point to places in code that interacted with the object but that are not directly present in the bad access stack trace. Currently, this includes call_rcu() and workqueue queuing. +CONFIG_KASAN_EXTRA_INFO +~~~~~~~~~~~~~~~~~~~~~~~ + +Enabling CONFIG_KASAN_EXTRA_INFO allows KASAN to record and report more +information. The extra information currently supported is the CPU number and +timestamp at allocation and free. More information can help find the cause of +the bug and correlate the error with other system events, at the cost of using +extra memory to record more information (more cost details in the help text of +CONFIG_KASAN_EXTRA_INFO). + +Here is the report with CONFIG_KASAN_EXTRA_INFO enabled (only the +different parts are shown):: + + ================================================================== + ... + Allocated by task 134 on cpu 5 at 229.133855s: + ... + Freed by task 136 on cpu 3 at 230.199335s: + ... + ================================================================== + Implementation details ---------------------- |