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llkd: Print thread group before panic the kernel

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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
(cherry picked from commit e5a09d8da5)
This commit is contained in:
Woody Lin 2020-04-22 10:18:59 +08:00
parent e343f439a3
commit 15c65cc321
1 changed files with 12 additions and 1 deletions
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13
llkd/libllkd.cpp
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@ -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);