On Mon, Oct 18, 2021 at 4:07 PM FMDF <fmdefrancesco@xxxxxxxxx> wrote: > > On Mon, 18 Oct 2021, 04:46 Dongliang Mu, <mudongliangabcd@xxxxxxxxx> wrote: >> >> Hi all, >> >> I am writing to kindly ask one question: is there any tracing >> mechanism in Linux kernel that can trace all the executed instructions >> of a user process? If this user process is run on different >> processors, traces of this process on different processors should be >> also recorded. > > > You've not explained in detail what is the purpose of the tracing that you want to do. Missing this information I can only provide you a list of links to various tools and methods. Take a look by yourself and try to figure out what is better suited for your needs... I want to log all the executed instructions of a user process (e.g., poc.c in syzkaller) in the kernel mode and then would like to leverage backward analysis to capture the root cause of kernel panic/crash. Therefore, I need the instruction-level tracing mechanisms or tools. > > https://lwn.net/Kernel/Index/#Development_tools-Kernel_tracing > trace-cmd: https://trace-cmd.org Ftrace is working at the function level. Therefore, ftrace and tracers based on ftrace are not suitable for my scenario. > perf ftrace: <Linux source>/tools/perf/Documentation/perf-trace.txt > perf-tools: https://github.com/brendangregg/perf-tools I am not familiar with the perf tool and cannot verify if it works for my scenario. > > In particular, the "function_graph" tracer of ftrace seems to be suited for your purposes: > > https://man7.org/linux/man-pages/man1/trace-cmd.1.html > https://man7.org/linux/man-pages/man1/trace-cmd-record.1.html > https://man7.org/linux/man-pages/man1/trace-cmd-report.1.html > > Obviously, gdb (and friends) is still invaluable (but it may be difficult to use, depending on your knowledge and experience, so use it if you really know that you need it): > > https://www.kernel.org/doc/html/latest/dev-tools/gdb-kernel-debugging.html > https://www.kernel.org/doc/html/latest/dev-tools/kgdb.html > > Regards, > > Fabio M. De Francesco > >> >> Any comment is welcome. >> >> -- >> My best regards to you. >> >> No System Is Safe! >> Dongliang Mu >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
