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Commit e5a09d8d authored by Woody Lin's avatar Woody Lin
Browse files

llkd: Print thread group before panic the kernel 

Debugging information for addressing the reason why the process stops as
a zombie, can be found by observing the call trace and running status of
threads in thread group of the zombie process.

Bug: 154667692
Change-Id: Icd7fa2161e88b08fd5ce0d5dc3a3790ed4ac02d1
parent 07ccf08a

llkd/libllkd.cpp

+12 −1
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ 
#include <string>

#include <unordered_map>

#include <unordered_set>

#include <vector>



#include <android-base/file.h>

#include <android-base/logging.h>
@@ -1204,9 +1205,19 @@ milliseconds llkCheck(bool checkRunning) { 
                }

            }

            // We are here because we have confirmed kernel live-lock

            std::vector<std::string> threads;

            auto taskdir = procdir + std::to_string(tid) + "/task/";

            dir taskDirectory(taskdir);

            for (auto tp = taskDirectory.read(); tp != nullptr; tp = taskDirectory.read()) {

                std::string piddir;

                if (getValidTidDir(tp, &piddir))

                    threads.push_back(android::base::Basename(piddir));

            }

            const auto message = state + " "s + llkFormat(procp->count) + " " +

                                 std::to_string(ppid) + "->" + std::to_string(pid) + "->" +

                                 std::to_string(tid) + " " + process_comm + " [panic]";

                                 std::to_string(tid) + " " + process_comm + " [panic]\n" +

                                 "  thread group: {" + android::base::Join(threads, ",") +

                                 "}";

            llkPanicKernel(dump, tid,

                           (state == 'Z') ? "zombie" : (state == 'D') ? "driver" : "sleeping",

                           message);