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diff --git a/docs/crash_reports.md b/docs/crash_reports.md deleted file mode 100644 index 31016286e..000000000 --- a/docs/crash_reports.md +++ /dev/null @@ -1,28 +0,0 @@ -# Crash Reports - -When `syzkaller` finds a crasher, it saves information about it into `workdir/crashes` directory. The directory contains one subdirectory per unique crash type. Each subdirectory contains a `description` file with a unique string identifying the crash (intended for bug identification and deduplication); and up to 100 `logN` and `reportN` files, one pair per test machine crash: -``` - - crashes/ - - 6e512290efa36515a7a27e53623304d20d1c3e - - description - - log0 - - report0 - - log1 - - report1 - ... - - 77c578906abe311d06227b9dc3bffa4c52676f - - description - - log0 - - report0 - ... -``` - -Descriptions are extracted using a set of [regular expressions](report/report.go#L33). This set may need to be extended if you are using a different kernel architecture, or are just seeing a previously unseen kernel error messages. - -`logN` files contain raw `syzkaller` logs and include kernel console output as well as programs executed before the crash. These logs can be fed to `syz-repro` tool for [crash location and minimization](reproducing_crashes.md), or to `syz-execprog` tool for [manual localization](executing_syzkaller_programs.md). `reportN` files contain post-processed and symbolized kernel crash reports (e.g. a KASAN report). Normally you need just 1 pair of these files (i.e. `log0` and `report0`), because they all presumably describe the same kernel bug. However, `syzkaller` saves up to 100 of them for the case when the crash is poorly reproducible, or if you just want to look at a set of crash reports to infer some similarities or differences. - -There are 3 special types of crashes: - - `no output from test machine`: the test machine produces no output whatsoever - - `lost connection to test machine`: the ssh connection to the machine was unexpectedly closed - - `test machine is not executing programs`: the machine looks alive, but no test programs were executed for long period of time -Most likely you won't see `reportN` files for these crashes (e.g. if there is no output from the test machine, there is nothing to put into report). Sometimes these crashes indicate a bug in `syzkaller` itself (especially if you see a Go panic message in the logs). However, frequently they mean a kernel lockup or something similarly bad (here are just a few examples of bugs found this way: [1](https://groups.google.com/d/msg/syzkaller/zfuHHRXL7Zg/Tc5rK8bdCAAJ), [2](https://groups.google.com/d/msg/syzkaller/kY_ml6TCm9A/wDd5fYFXBQAJ), [3](https://groups.google.com/d/msg/syzkaller/OM7CXieBCoY/etzvFPX3AQAJ)). |