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Commit 1b40fce4 authored by Jing Wang's avatar Jing Wang
Browse files

init: Add a boot monitor for the second stage init 



The boot monitor detects early boot lock-up issues before RescueParty starts.

Test:
fastboot oem cmdline set androidboot.boot_timeout=30
fastboot oem cmdline set androidboot.boot_timeout=180

Bug: 383565535
Change-Id: I67d69eac211423c946f0ea62acd0dff525593ea7
Signed-off-by: default avatarJing Wang <jwangh@google.com>
parent 0863b09f

init/init.cpp

+40 −0
Original line number Diff line number Diff line
@@ -100,6 +100,8 @@ using namespace std::string_literals; 
using android::base::boot_clock;

using android::base::ConsumePrefix;

using android::base::GetProperty;

using android::base::GetIntProperty;

using android::base::GetBoolProperty;

using android::base::ReadFileToString;

using android::base::SetProperty;

using android::base::StringPrintf;
@@ -108,6 +110,8 @@ using android::base::Trim; 
using android::base::unique_fd;

using android::fs_mgr::AvbHandle;

using android::snapshot::SnapshotManager;

using android::base::WaitForProperty;

using android::base::WriteStringToFile;



namespace android {

namespace init {
@@ -919,6 +923,34 @@ static Result<void> ConnectEarlyStageSnapuserdAction(const BuiltinArguments& arg 
    return {};

}



static void SecondStageBootMonitor(int timeout_sec) {

    auto cur_time = boot_clock::now().time_since_epoch();

    int cur_sec = std::chrono::duration_cast<std::chrono::seconds>(cur_time).count();

    int extra_sec = timeout_sec <= cur_sec? 0 : timeout_sec - cur_sec;

    auto boot_timeout = std::chrono::seconds(extra_sec);



    LOG(INFO) << "Started BootMonitorThread, expiring in "

              << timeout_sec

              << " seconds from boot-up";



    if (!WaitForProperty("sys.boot_completed", "1", boot_timeout)) {

        LOG(ERROR) << "BootMonitorThread: boot didn't complete in "

                   << timeout_sec

                   << " seconds. Trigger a panic!";



        // add a short delay for logs to be flushed out.

        std::this_thread::sleep_for(200ms);



        // trigger a kernel panic

        WriteStringToFile("c", PROC_SYSRQ);

    }

}



static void StartSecondStageBootMonitor(int timeout_sec) {

    std::thread monitor_thread(&SecondStageBootMonitor, timeout_sec);

    monitor_thread.detach();

}



int SecondStageMain(int argc, char** argv) {

    if (REBOOT_BOOTLOADER_ON_PANIC) {

        InstallRebootSignalHandlers();
@@ -1010,6 +1042,14 @@ int SecondStageMain(int argc, char** argv) { 
    InstallInitNotifier(&epoll);

    StartPropertyService(&property_fd);



    // If boot_timeout property has been set in a debug build, start the boot monitor

    if (GetBoolProperty("ro.debuggable", false)) {

        int timeout = GetIntProperty("ro.boot.boot_timeout", 0);

        if (timeout > 0) {

            StartSecondStageBootMonitor(timeout);

        }

    }



    // Make the time that init stages started available for bootstat to log.

    RecordStageBoottimes(start_time);