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bootstat.cpp
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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// The bootstat command provides options to persist boot events with the current
// timestamp, dump the persisted events, and log all events to EventLog to be
// uploaded to Android log storage via Tron.
#include <getopt.h>
#include <sys/klog.h>
#include <unistd.h>
#include <chrono>
#include <cmath>
#include <cstddef>
#include <cstdio>
#include <ctime>
#include <iterator>
#include <map>
#include <memory>
#include <regex>
#include <string>
#include <string_view>
#include <unordered_map>
#include <utility>
#include <vector>
#include <android-base/chrono_utils.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/properties.h>
#include <android-base/strings.h>
#include <android/log.h>
#include <cutils/android_reboot.h>
#include <cutils/properties.h>
#include <statslog.h>
#include "boot_event_record_store.h"
namespace {
struct AtomInfo {
int32_t atom;
int32_t event;
};
// Maps BootEvent used inside bootstat into statsd atom defined in
// frameworks/proto_logging/stats/atoms.proto.
const std::unordered_map<std::string_view, AtomInfo> kBootEventToAtomInfo = {
// ELAPSED_TIME
{"ro.boottime.init",
{android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__ANDROID_INIT_STAGE_1}},
{"boot_complete",
{android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__BOOT_COMPLETE}},
{"boot_complete_no_encryption",
{android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__BOOT_COMPLETE_NO_ENCRYPTION}},
{"factory_reset_boot_complete",
{android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__FACTORY_RESET_BOOT_COMPLETE}},
{"factory_reset_boot_complete_no_encryption",
{android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
android::util::
BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__FACTORY_RESET_BOOT_COMPLETE_NO_ENCRYPTION}},
{"ota_boot_complete",
{android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__OTA_BOOT_COMPLETE}},
{"ota_boot_complete_no_encryption",
{android::util::BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,
android::util::BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__OTA_BOOT_COMPLETE_NO_ENCRYPTION}},
// DURATION
{"absolute_boot_time",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__ABSOLUTE_BOOT_TIME}},
{"boottime.bootloader.1BLE",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__BOOTLOADER_FIRST_STAGE_EXEC}},
{"boottime.bootloader.1BLL",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__BOOTLOADER_FIRST_STAGE_LOAD}},
{"boottime.bootloader.KL",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__BOOTLOADER_KERNEL_LOAD}},
{"boottime.bootloader.2BLE",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__BOOTLOADER_SECOND_STAGE_EXEC}},
{"boottime.bootloader.2BLL",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__BOOTLOADER_SECOND_STAGE_LOAD}},
{"boottime.bootloader.SW",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__BOOTLOADER_UI_WAIT}},
{"boottime.bootloader.total",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__BOOTLOADER_TOTAL}},
{"boottime.init.cold_boot_wait",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__COLDBOOT_WAIT}},
{"time_since_factory_reset",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__FACTORY_RESET_TIME_SINCE_RESET}},
{"ro.boottime.init.first_stage",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__ANDROID_INIT_STAGE_1}},
{"ro.boottime.init.selinux",
{android::util::BOOT_TIME_EVENT_DURATION_REPORTED,
android::util::BOOT_TIME_EVENT_DURATION__EVENT__SELINUX_INIT}},
// UTC_TIME
{"factory_reset",
{android::util::BOOT_TIME_EVENT_UTC_TIME_REPORTED,
android::util::BOOT_TIME_EVENT_UTC_TIME__EVENT__FACTORY_RESET_RESET_TIME}},
{"factory_reset_current_time",
{android::util::BOOT_TIME_EVENT_UTC_TIME_REPORTED,
android::util::BOOT_TIME_EVENT_UTC_TIME__EVENT__FACTORY_RESET_CURRENT_TIME}},
{"factory_reset_record_value",
{android::util::BOOT_TIME_EVENT_UTC_TIME_REPORTED,
android::util::BOOT_TIME_EVENT_UTC_TIME__EVENT__FACTORY_RESET_RECORD_VALUE}},
// ERROR_CODE
{"factory_reset_current_time_failure",
{android::util::BOOT_TIME_EVENT_ERROR_CODE_REPORTED,
android::util::BOOT_TIME_EVENT_ERROR_CODE__EVENT__FACTORY_RESET_CURRENT_TIME_FAILURE}},
};
// Scans the boot event record store for record files and logs each boot event
// via EventLog.
void LogBootEvents() {
BootEventRecordStore boot_event_store;
auto events = boot_event_store.GetAllBootEvents();
std::vector<std::string_view> notSupportedEvents;
for (const auto& event : events) {
const auto& name = event.first;
const auto& info = kBootEventToAtomInfo.find(name);
if (info != kBootEventToAtomInfo.end()) {
if (info->second.atom == android::util::BOOT_TIME_EVENT_ERROR_CODE_REPORTED) {
android::util::stats_write(static_cast<int32_t>(info->second.atom),
static_cast<int32_t>(info->second.event),
static_cast<int32_t>(event.second));
} else {
android::util::stats_write(static_cast<int32_t>(info->second.atom),
static_cast<int32_t>(info->second.event),
static_cast<int64_t>(event.second));
}
} else {
notSupportedEvents.push_back(name);
}
}
if (!notSupportedEvents.empty()) {
LOG(WARNING) << "LogBootEvents, atomInfo not defined for events:"
<< android::base::Join(notSupportedEvents, ',');
}
}
// Records the named boot |event| to the record store. If |value| is non-empty
// and is a proper string representation of an integer value, the converted
// integer value is associated with the boot event.
void RecordBootEventFromCommandLine(const std::string& event, const std::string& value_str) {
BootEventRecordStore boot_event_store;
if (!value_str.empty()) {
int32_t value = 0;
if (android::base::ParseInt(value_str, &value)) {
boot_event_store.AddBootEventWithValue(event, value);
}
} else {
boot_event_store.AddBootEvent(event);
}
}
void PrintBootEvents() {
printf("Boot events:\n");
printf("------------\n");
BootEventRecordStore boot_event_store;
auto events = boot_event_store.GetAllBootEvents();
for (auto i = events.cbegin(); i != events.cend(); ++i) {
printf("%s\t%d\n", i->first.c_str(), i->second);
}
}
void ShowHelp(const char* cmd) {
fprintf(stderr, "Usage: %s [options]...\n", cmd);
fprintf(stderr,
"options include:\n"
" -h, --help Show this help\n"
" -l, --log Log all metrics to logstorage\n"
" -p, --print Dump the boot event records to the console\n"
" -r, --record Record the timestamp of a named boot event\n"
" --value Optional value to associate with the boot event\n"
" --record_boot_complete Record metrics related to the time for the device boot\n"
" --record_boot_reason Record the reason why the device booted\n"
" --record_time_since_factory_reset Record the time since the device was reset\n"
" --boot_reason_enum=<reason> Report the match to the kBootReasonMap table\n");
}
// Constructs a readable, printable string from the givencommand line
// arguments.
std::string GetCommandLine(int argc, char** argv) {
std::string cmd;
for (int i = 0; i < argc; ++i) {
cmd += argv[i];
cmd += " ";
}
return cmd;
}
constexpr int32_t kEmptyBootReason = 0;
constexpr int32_t kUnknownBootReason = 1;
// A mapping from boot reason string, as read from the ro.boot.bootreason
// system property, to a unique integer ID. Viewers of log data dashboards for
// the boot_reason metric may refer to this mapping to discern the histogram
// values. Regex matching, to manage the scale, as a minimum require either
// [, \ or * to be present in the string to switch to checking.
const std::map<std::string, int32_t> kBootReasonMap = {
{"reboot,[empty]", kEmptyBootReason},
{"__BOOTSTAT_UNKNOWN__", kUnknownBootReason},
{"normal", 2},
{"recovery", 3},
{"reboot", 4},
{"PowerKey", 5},
{"hard_reset", 6},
{"kernel_panic", 7},
{"rpm_err", 8},
{"hw_reset", 9},
{"tz_err", 10},
{"adsp_err", 11},
{"modem_err", 12},
{"mba_err", 13},
{"Watchdog", 14},
{"Panic", 15},
{"power_key", 16}, // aliasReasons to cold,powerkey (Mediatek)
{"power_on", 17}, // aliasReasons to cold,powerkey
{"Reboot", 18},
{"rtc", 19},
{"edl", 20},
{"oem_pon1", 21},
{"oem_powerkey", 22}, // aliasReasons to cold,powerkey
{"oem_unknown_reset", 23},
{"srto: HWWDT reset SC", 24},
{"srto: HWWDT reset platform", 25},
{"srto: bootloader", 26},
{"srto: kernel panic", 27},
{"srto: kernel watchdog reset", 28},
{"srto: normal", 29},
{"srto: reboot", 30},
{"srto: reboot-bootloader", 31},
{"srto: security watchdog reset", 32},
{"srto: wakesrc", 33},
{"srto: watchdog", 34},
{"srto:1-1", 35},
{"srto:omap_hsmm", 36},
{"srto:phy0", 37},
{"srto:rtc0", 38},
{"srto:touchpad", 39},
{"watchdog", 40},
{"watchdogr", 41},
{"wdog_bark", 42},
{"wdog_bite", 43},
{"wdog_reset", 44},
{"shutdown,", 45}, // Trailing comma is intentional. Do NOT use.
{"shutdown,userrequested", 46},
{"reboot,bootloader", 47},
{"reboot,cold", 48},
{"reboot,recovery", 49},
{"thermal_shutdown", 50},
{"s3_wakeup", 51},
{"kernel_panic,sysrq", 52},
{"kernel_panic,NULL", 53},
{"kernel_panic,null", 53},
{"kernel_panic,BUG", 54},
{"kernel_panic,bug", 54},
{"bootloader", 55},
{"cold", 56},
{"hard", 57},
{"warm", 58},
{"reboot,kernel_power_off_charging__reboot_system", 59}, // Can not happen
{"thermal-shutdown", 60},
{"shutdown,thermal", 61},
{"shutdown,battery", 62},
{"reboot,ota", 63},
{"reboot,factory_reset", 64},
{"reboot,", 65},
{"reboot,shell", 66},
{"reboot,adb", 67},
{"reboot,userrequested", 68},
{"shutdown,container", 69}, // Host OS asking Android Container to shutdown
{"cold,powerkey", 70},
{"warm,s3_wakeup", 71},
{"hard,hw_reset", 72},
{"shutdown,suspend", 73}, // Suspend to RAM
{"shutdown,hibernate", 74}, // Suspend to DISK
{"power_on_key", 75}, // aliasReasons to cold,powerkey
{"reboot_by_key", 76}, // translated to reboot,by_key
{"wdt_by_pass_pwk", 77}, // Mediatek
{"reboot_longkey", 78}, // translated to reboot,longkey
{"powerkey", 79}, // aliasReasons to cold,powerkey
{"usb", 80}, // aliasReasons to cold,charger (Mediatek)
{"wdt", 81}, // Mediatek
{"tool_by_pass_pwk", 82}, // aliasReasons to reboot,tool (Mediatek)
{"2sec_reboot", 83}, // aliasReasons to cold,rtc,2sec (Mediatek)
{"reboot,by_key", 84},
{"reboot,longkey", 85},
{"reboot,2sec", 86}, // Deprecate in two years, replaced with cold,rtc,2sec
{"shutdown,thermal,battery", 87},
{"reboot,its_just_so_hard", 88}, // produced by boot_reason_test
{"reboot,Its Just So Hard", 89}, // produced by boot_reason_test
{"reboot,rescueparty", 90},
{"charge", 91},
{"oem_tz_crash", 92},
{"uvlo", 93}, // aliasReasons to reboot,undervoltage
{"oem_ps_hold", 94},
{"abnormal_reset", 95},
{"oemerr_unknown", 96},
{"reboot_fastboot_mode", 97},
{"watchdog_apps_bite", 98},
{"xpu_err", 99},
{"power_on_usb", 100}, // aliasReasons to cold,charger
{"watchdog_rpm", 101},
{"watchdog_nonsec", 102},
{"watchdog_apps_bark", 103},
{"reboot_dmverity_corrupted", 104},
{"reboot_smpl", 105}, // aliasReasons to reboot,powerloss
{"watchdog_sdi_apps_reset", 106},
{"smpl", 107}, // aliasReasons to reboot,powerloss
{"oem_modem_failed_to_powerup", 108},
{"reboot_normal", 109},
{"oem_lpass_cfg", 110},
{"oem_xpu_ns_error", 111},
{"power_key_press", 112}, // aliasReasons to cold,powerkey
{"hardware_reset", 113},
{"reboot_by_powerkey", 114}, // aliasReasons to cold,powerkey (is this correct?)
{"reboot_verity", 115},
{"oem_rpm_undef_error", 116},
{"oem_crash_on_the_lk", 117},
{"oem_rpm_reset", 118},
{"reboot,powerloss", 119},
{"reboot,undervoltage", 120},
{"factory_cable", 121},
{"oem_ar6320_failed_to_powerup", 122},
{"watchdog_rpm_bite", 123},
{"power_on_cable", 124}, // aliasReasons to cold,charger
{"reboot_unknown", 125},
{"wireless_charger", 126},
{"0x776655ff", 127},
{"oem_thermal_bite_reset", 128},
{"charger", 129},
{"pon1", 130},
{"unknown", 131},
{"reboot_rtc", 132},
{"cold_boot", 133},
{"hard_rst", 134},
{"power-on", 135},
{"oem_adsp_resetting_the_soc", 136},
{"kpdpwr", 137},
{"oem_modem_timeout_waiting", 138},
{"usb_chg", 139},
{"warm_reset_0x02", 140},
{"warm_reset_0x80", 141},
{"pon_reason_0xb0", 142},
{"reboot_download", 143},
{"reboot_recovery_mode", 144},
{"oem_sdi_err_fatal", 145},
{"pmic_watchdog", 146},
{"software_master", 147},
{"cold,charger", 148},
{"cold,rtc", 149},
{"cold,rtc,2sec", 150}, // Mediatek
{"reboot,tool", 151}, // Mediatek
{"reboot,wdt", 152}, // Mediatek
{"reboot,unknown", 153}, // Mediatek
{"kernel_panic,audit", 154},
{"kernel_panic,atomic", 155},
{"kernel_panic,hung", 156},
{"kernel_panic,hung,rcu", 157},
{"kernel_panic,init", 158},
{"kernel_panic,oom", 159},
{"kernel_panic,stack", 160},
{"kernel_panic,sysrq,livelock,alarm", 161}, // llkd
{"kernel_panic,sysrq,livelock,driver", 162}, // llkd
{"kernel_panic,sysrq,livelock,zombie", 163}, // llkd
{"kernel_panic,modem", 164},
{"kernel_panic,adsp", 165},
{"kernel_panic,dsps", 166},
{"kernel_panic,wcnss", 167},
{"kernel_panic,_sde_encoder_phys_cmd_handle_ppdone_timeout", 168},
{"recovery,quiescent", 169},
{"reboot,quiescent", 170},
{"reboot,rtc", 171},
{"reboot,dm-verity_device_corrupted", 172},
{"reboot,dm-verity_enforcing", 173},
{"reboot,keys_clear", 174},
{"reboot,pmic_off_fault,.*", 175},
{"reboot,pmic_off_s3rst,.*", 176},
{"reboot,pmic_off_other,.*", 177},
{"reboot,userrequested,fastboot", 178},
{"reboot,userrequested,recovery", 179},
{"reboot,userrequested,recovery,ui", 180},
{"shutdown,userrequested,fastboot", 181},
{"shutdown,userrequested,recovery", 182},
{"reboot,unknown[0-9]*", 183},
{"reboot,longkey,.*", 184},
{"reboot,boringssl-self-check-failed", 185},
{"reboot,userspace_failed,shutdown_aborted", 186},
{"reboot,userspace_failed,watchdog_triggered", 187},
{"reboot,userspace_failed,watchdog_fork", 188},
{"reboot,userspace_failed,*", 189},
{"reboot,mount_userdata_failed", 190},
{"reboot,forcedsilent", 191},
{"reboot,forcednonsilent", 192},
{"reboot,thermal,tj", 193},
{"reboot,emergency", 194},
{"reboot,factory", 195},
{"reboot,fastboot", 196},
{"reboot,gsa,hard", 197},
{"reboot,gsa,soft", 198},
{"reboot,master_dc,fault_n", 199},
{"reboot,master_dc,reset", 200},
{"reboot,ocp", 201},
{"reboot,pin", 202},
{"reboot,rom_recovery", 203},
{"reboot,uvlo", 204},
{"reboot,uvlo,pmic,if", 205},
{"reboot,uvlo,pmic,main", 206},
{"reboot,uvlo,pmic,sub", 207},
{"reboot,warm", 208},
{"watchdog,aoc", 209},
{"watchdog,apc", 210},
{"watchdog,apc,bl,debug,early", 211},
{"watchdog,apc,bl,early", 212},
{"watchdog,apc,early", 213},
{"watchdog,apm", 214},
{"watchdog,gsa,hard", 215},
{"watchdog,gsa,soft", 216},
{"watchdog,pmucal", 217},
{"reboot,early,bl", 218},
{"watchdog,apc,gsa,crashed", 219},
{"watchdog,apc,bl31,crashed", 220},
{"watchdog,apc,pbl,crashed", 221},
{"reboot,memory_protect,hyp", 222},
{"reboot,tsd,pmic,main", 223},
{"reboot,tsd,pmic,sub", 224},
{"reboot,ocp,pmic,main", 225},
{"reboot,ocp,pmic,sub", 226},
{"reboot,sys_ldo_ok,pmic,main", 227},
{"reboot,sys_ldo_ok,pmic,sub", 228},
{"reboot,smpl_timeout,pmic,main", 229},
};
// Converts a string value representing the reason the system booted to an
// integer representation. This is necessary for logging the boot_reason metric
// via Tron, which does not accept non-integer buckets in histograms.
int32_t BootReasonStrToEnum(const std::string& boot_reason) {
auto mapping = kBootReasonMap.find(boot_reason);
if (mapping != kBootReasonMap.end()) {
return mapping->second;
}
if (boot_reason.empty()) {
return kEmptyBootReason;
}
for (const auto& [match, id] : kBootReasonMap) {
// Regex matches as a minimum require either [, \ or * to be present.
if (match.find_first_of("[\\*") == match.npos) continue;
// enforce match from beginning to end
auto exact = match;
if (exact[0] != '^') exact = "^" + exact;
if (exact[exact.size() - 1] != '$') exact = exact + "$";
if (std::regex_search(boot_reason, std::regex(exact))) return id;
}
LOG(INFO) << "Unknown boot reason: " << boot_reason;
return kUnknownBootReason;
}
// Canonical list of supported primary reboot reasons.
const std::vector<const std::string> knownReasons = {
// clang-format off
// kernel
"watchdog",
"kernel_panic",
// strong
"recovery", // Should not happen from ro.boot.bootreason
"bootloader", // Should not happen from ro.boot.bootreason
// blunt
"cold",
"hard",
"warm",
// super blunt
"shutdown", // Can not happen from ro.boot.bootreason
"reboot", // Default catch-all for anything unknown
// clang-format on
};
// Returns true if the supplied reason prefix is considered detailed enough.
bool isStrongRebootReason(const std::string& r) {
for (auto& s : knownReasons) {
if (s == "cold") break;
// Prefix defined as terminated by a nul or comma (,).
if (android::base::StartsWith(r, s) && ((r.length() == s.length()) || (r[s.length()] == ','))) {
return true;
}
}
return false;
}
// Returns true if the supplied reason prefix is associated with the kernel.
bool isKernelRebootReason(const std::string& r) {
for (auto& s : knownReasons) {
if (s == "recovery") break;
// Prefix defined as terminated by a nul or comma (,).
if (android::base::StartsWith(r, s) && ((r.length() == s.length()) || (r[s.length()] == ','))) {
return true;
}
}
return false;
}
// Returns true if the supplied reason prefix is considered known.
bool isKnownRebootReason(const std::string& r) {
for (auto& s : knownReasons) {
// Prefix defined as terminated by a nul or comma (,).
if (android::base::StartsWith(r, s) && ((r.length() == s.length()) || (r[s.length()] == ','))) {
return true;
}
}
return false;
}
// If the reboot reason should be improved, report true if is too blunt.
bool isBluntRebootReason(const std::string& r) {
if (isStrongRebootReason(r)) return false;
if (!isKnownRebootReason(r)) return true; // Can not support unknown as detail
size_t pos = 0;
while ((pos = r.find(',', pos)) != std::string::npos) {
++pos;
std::string next(r.substr(pos));
if (next.length() == 0) break;
if (next[0] == ',') continue;
if (!isKnownRebootReason(next)) return false; // Unknown subreason is good.
if (isStrongRebootReason(next)) return false; // eg: reboot,reboot
}
return true;
}
bool readPstoreConsole(std::string& console) {
if (android::base::ReadFileToString("/sys/fs/pstore/console-ramoops-0", &console)) {
return true;
}
return android::base::ReadFileToString("/sys/fs/pstore/console-ramoops", &console);
}
// Implement a variant of std::string::rfind that is resilient to errors in
// the data stream being inspected.
class pstoreConsole {
private:
const size_t kBitErrorRate = 8; // number of bits per error
const std::string& console;
// Number of bits that differ between the two arguments l and r.
// Returns zero if the values for l and r are identical.
size_t numError(uint8_t l, uint8_t r) const { return std::bitset<8>(l ^ r).count(); }
// A string comparison function, reports the number of errors discovered
// in the match to a maximum of the bitLength / kBitErrorRate, at that
// point returning npos to indicate match is too poor.
//
// Since called in rfind which works backwards, expect cache locality will
// help if we check in reverse here as well for performance.
//
// Assumption: l (from console.c_str() + pos) is long enough to house
// _r.length(), checked in rfind caller below.
//
size_t numError(size_t pos, const std::string& _r) const {
const char* l = console.c_str() + pos;
const char* r = _r.c_str();
size_t n = _r.length();
const uint8_t* le = reinterpret_cast<const uint8_t*>(l) + n;
const uint8_t* re = reinterpret_cast<const uint8_t*>(r) + n;
size_t count = 0;
n = 0;
do {
// individual character bit error rate > threshold + slop
size_t num = numError(*--le, *--re);
if (num > ((8 + kBitErrorRate) / kBitErrorRate)) return std::string::npos;
// total bit error rate > threshold + slop
count += num;
++n;
if (count > ((n * 8 + kBitErrorRate - (n > 2)) / kBitErrorRate)) {
return std::string::npos;
}
} while (le != reinterpret_cast<const uint8_t*>(l));
return count;
}
public:
explicit pstoreConsole(const std::string& console) : console(console) {}
// scope of argument must be equal to or greater than scope of pstoreConsole
explicit pstoreConsole(const std::string&& console) = delete;
explicit pstoreConsole(std::string&& console) = delete;
// Our implementation of rfind, use exact match first, then resort to fuzzy.
size_t rfind(const std::string& needle) const {
size_t pos = console.rfind(needle); // exact match?
if (pos != std::string::npos) return pos;
// Check to make sure needle fits in console string.
pos = console.length();
if (needle.length() > pos) return std::string::npos;
pos -= needle.length();
// fuzzy match to maximum kBitErrorRate
for (;;) {
if (numError(pos, needle) != std::string::npos) return pos;
if (pos == 0) break;
--pos;
}
return std::string::npos;
}
// Our implementation of find, use only fuzzy match.
size_t find(const std::string& needle, size_t start = 0) const {
// Check to make sure needle fits in console string.
if (needle.length() > console.length()) return std::string::npos;
const size_t last_pos = console.length() - needle.length();
// fuzzy match to maximum kBitErrorRate
for (size_t pos = start; pos <= last_pos; ++pos) {
if (numError(pos, needle) != std::string::npos) return pos;
}
return std::string::npos;
}
operator const std::string&() const { return console; }
};
// If bit error match to needle, correct it.
// Return true if any corrections were discovered and applied.
bool correctForBitError(std::string& reason, const std::string& needle) {
bool corrected = false;
if (reason.length() < needle.length()) return corrected;
const pstoreConsole console(reason);
const size_t last_pos = reason.length() - needle.length();
for (size_t pos = 0; pos <= last_pos; pos += needle.length()) {
pos = console.find(needle, pos);
if (pos == std::string::npos) break;
// exact match has no malice
if (needle == reason.substr(pos, needle.length())) continue;
corrected = true;
reason = reason.substr(0, pos) + needle + reason.substr(pos + needle.length());
}
return corrected;
}
// If bit error match to needle, correct it.
// Return true if any corrections were discovered and applied.
// Try again if we can replace underline with spaces.
bool correctForBitErrorOrUnderline(std::string& reason, const std::string& needle) {
bool corrected = correctForBitError(reason, needle);
std::string _needle(needle);
std::transform(_needle.begin(), _needle.end(), _needle.begin(),
[](char c) { return (c == '_') ? ' ' : c; });
if (needle != _needle) {
corrected |= correctForBitError(reason, _needle);
}
return corrected;
}
// Converts a string value representing the reason the system booted to a
// string complying with Android system standard reason.
void transformReason(std::string& reason) {
std::transform(reason.begin(), reason.end(), reason.begin(), ::tolower);
std::transform(reason.begin(), reason.end(), reason.begin(),
[](char c) { return ::isblank(c) ? '_' : c; });
std::transform(reason.begin(), reason.end(), reason.begin(),
[](char c) { return ::isprint(c) ? c : '?'; });
}
// Check subreasons for reboot,<subreason> kernel_panic,sysrq,<subreason> or
// kernel_panic,<subreason>.
//
// If quoted flag is set, pull out and correct single quoted ('), newline (\n)
// or unprintable character terminated subreason, pos is supplied just beyond
// first quote. if quoted false, pull out and correct newline (\n) or
// unprintable character terminated subreason.
//
// Heuristics to find termination is painted into a corner:
// single bit error for quote ' that we can block. It is acceptable for
// the others 7, g in reason. 2/9 chance will miss the terminating quote,
// but there is always the terminating newline that usually immediately
// follows to fortify our chances.
bool likely_single_quote(char c) {
switch (static_cast<uint8_t>(c)) {
case '\'': // '\''
case '\'' ^ 0x01: // '&'
case '\'' ^ 0x02: // '%'
case '\'' ^ 0x04: // '#'
case '\'' ^ 0x08: // '/'
return true;
case '\'' ^ 0x10: // '7'
break;
case '\'' ^ 0x20: // '\a' (unprintable)
return true;
case '\'' ^ 0x40: // 'g'
break;
case '\'' ^ 0x80: // 0xA7 (unprintable)
return true;
}
return false;
}
// ::isprint(c) and likely_space() will prevent us from being called for
// fundamentally printable entries, except for '\r' and '\b'.
//
// Except for * and J, single bit errors for \n, all others are non-
// printable so easy catch. It is _acceptable_ for *, J or j to exist in
// the reason string, so 2/9 chance we will miss the terminating newline.
//
// NB: J might not be acceptable, except if at the beginning or preceded
// with a space, '(' or any of the quotes and their BER aliases.
// NB: * might not be acceptable, except if at the beginning or preceded
// with a space, another *, or any of the quotes or their BER aliases.
//
// To reduce the chances to closer to 1/9 is too complicated for the gain.
bool likely_newline(char c) {
switch (static_cast<uint8_t>(c)) {
case '\n': // '\n' (unprintable)
case '\n' ^ 0x01: // '\r' (unprintable)
case '\n' ^ 0x02: // '\b' (unprintable)
case '\n' ^ 0x04: // 0x0E (unprintable)
case '\n' ^ 0x08: // 0x02 (unprintable)
case '\n' ^ 0x10: // 0x1A (unprintable)
return true;
case '\n' ^ 0x20: // '*'
case '\n' ^ 0x40: // 'J'
break;
case '\n' ^ 0x80: // 0x8A (unprintable)
return true;
}
return false;
}
// ::isprint(c) will prevent us from being called for all the printable
// matches below. If we let unprintables through because of this, they
// get converted to underscore (_) by the validation phase.
bool likely_space(char c) {
switch (static_cast<uint8_t>(c)) {
case ' ': // ' '
case ' ' ^ 0x01: // '!'
case ' ' ^ 0x02: // '"'
case ' ' ^ 0x04: // '$'
case ' ' ^ 0x08: // '('
case ' ' ^ 0x10: // '0'
case ' ' ^ 0x20: // '\0' (unprintable)
case ' ' ^ 0x40: // 'P'
case ' ' ^ 0x80: // 0xA0 (unprintable)
case '\t': // '\t'
case '\t' ^ 0x01: // '\b' (unprintable) (likely_newline counters)
case '\t' ^ 0x02: // '\v' (unprintable)
case '\t' ^ 0x04: // '\r' (unprintable) (likely_newline counters)
case '\t' ^ 0x08: // 0x01 (unprintable)
case '\t' ^ 0x10: // 0x19 (unprintable)
case '\t' ^ 0x20: // ')'
case '\t' ^ 0x40: // '1'
case '\t' ^ 0x80: // 0x89 (unprintable)
return true;
}
return false;
}
std::string getSubreason(const std::string& content, size_t pos, bool quoted) {
static constexpr size_t max_reason_length = 256;
std::string subReason(content.substr(pos, max_reason_length));
// Correct against any known strings that Bit Error Match
for (const auto& s : knownReasons) {
correctForBitErrorOrUnderline(subReason, s);
}
std::string terminator(quoted ? "'" : "");
for (const auto& m : kBootReasonMap) {
if (m.first.length() <= strlen("cold")) continue; // too short?
if (correctForBitErrorOrUnderline(subReason, m.first + terminator)) continue;
if (m.first.length() <= strlen("reboot,cold")) continue; // short?
if (android::base::StartsWith(m.first, "reboot,")) {
correctForBitErrorOrUnderline(subReason, m.first.substr(strlen("reboot,")) + terminator);
} else if (android::base::StartsWith(m.first, "kernel_panic,sysrq,")) {
correctForBitErrorOrUnderline(subReason,
m.first.substr(strlen("kernel_panic,sysrq,")) + terminator);
} else if (android::base::StartsWith(m.first, "kernel_panic,")) {
correctForBitErrorOrUnderline(subReason, m.first.substr(strlen("kernel_panic,")) + terminator);
}
}
for (pos = 0; pos < subReason.length(); ++pos) {
char c = subReason[pos];
if (!(::isprint(c) || likely_space(c)) || likely_newline(c) ||
(quoted && likely_single_quote(c))) {
subReason.erase(pos);
break;
}
}
transformReason(subReason);
return subReason;
}
bool addKernelPanicSubReason(const pstoreConsole& console, std::string& ret) {
// Check for kernel panic types to refine information
if ((console.rfind("SysRq : Trigger a crash") != std::string::npos) ||
(console.rfind("PC is at sysrq_handle_crash+") != std::string::npos)) {
ret = "kernel_panic,sysrq";
// Invented for Android to allow daemons that specifically trigger sysrq
// to communicate more accurate boot subreasons via last console messages.
static constexpr char sysrqSubreason[] = "SysRq : Trigger a crash : '";
auto pos = console.rfind(sysrqSubreason);
if (pos != std::string::npos) {
ret += "," + getSubreason(console, pos + strlen(sysrqSubreason), /* quoted */ true);
}
return true;
}
if (console.rfind("Unable to handle kernel NULL pointer dereference at virtual address") !=
std::string::npos) {
ret = "kernel_panic,null";
return true;
}
if (console.rfind("Kernel BUG at ") != std::string::npos) {
ret = "kernel_panic,bug";
return true;
}
std::string panic("Kernel panic - not syncing: ");
auto pos = console.rfind(panic);
if (pos != std::string::npos) {
static const std::vector<std::pair<const std::string, const std::string>> panicReasons = {
{"Out of memory", "oom"},
{"out of memory", "oom"},
{"Oh boy, that early out of memory", "oom"}, // omg
{"BUG!", "bug"},
{"hung_task: blocked tasks", "hung"},
{"audit: ", "audit"},
{"scheduling while atomic", "atomic"},
{"Attempted to kill init!", "init"},
{"Requested init", "init"},
{"No working init", "init"},
{"Could not decompress init", "init"},
{"RCU Stall", "hung,rcu"},
{"stack-protector", "stack"},
{"kernel stack overflow", "stack"},
{"Corrupt kernel stack", "stack"},
{"low stack detected", "stack"},
{"corrupted stack end", "stack"},
{"subsys-restart: Resetting the SoC - modem crashed.", "modem"},
{"subsys-restart: Resetting the SoC - adsp crashed.", "adsp"},
{"subsys-restart: Resetting the SoC - dsps crashed.", "dsps"},
{"subsys-restart: Resetting the SoC - wcnss crashed.", "wcnss"},
};
ret = "kernel_panic";
for (auto& s : panicReasons) {
if (console.find(panic + s.first, pos) != std::string::npos) {
ret += "," + s.second;
return true;
}
}
auto reason = getSubreason(console, pos + panic.length(), /* newline */ false);
if (reason.length() > 3) {
ret += "," + reason;
}
return true;
}
return false;
}
bool addKernelPanicSubReason(const std::string& content, std::string& ret) {
return addKernelPanicSubReason(pstoreConsole(content), ret);
}
const char system_reboot_reason_property[] = "sys.boot.reason";
const char last_reboot_reason_property[] = LAST_REBOOT_REASON_PROPERTY;
const char last_reboot_reason_file[] = LAST_REBOOT_REASON_FILE;
const char last_last_reboot_reason_property[] = "sys.boot.reason.last";
constexpr size_t history_reboot_reason_size = 4;
const char history_reboot_reason_property[] = LAST_REBOOT_REASON_PROPERTY ".history";
const char bootloader_reboot_reason_property[] = "ro.boot.bootreason";
// Land system_boot_reason into system_reboot_reason_property.
// Shift system_boot_reason into history_reboot_reason_property.
void BootReasonAddToHistory(const std::string& system_boot_reason) {
if (system_boot_reason.empty()) return;
LOG(INFO) << "Canonical boot reason: " << system_boot_reason;
auto old_system_boot_reason = android::base::GetProperty(system_reboot_reason_property, "");
if (!android::base::SetProperty(system_reboot_reason_property, system_boot_reason)) {
android::base::SetProperty(system_reboot_reason_property,
system_boot_reason.substr(0, PROPERTY_VALUE_MAX - 1));
}
auto reason_history =
android::base::Split(android::base::GetProperty(history_reboot_reason_property, ""), "\n");
static auto mark = time(nullptr);
auto mark_str = std::string(",") + std::to_string(mark);
auto marked_system_boot_reason = system_boot_reason + mark_str;
if (!reason_history.empty()) {
// delete any entries that we just wrote in a previous
// call and leveraging duplicate line handling
auto last = old_system_boot_reason + mark_str;
// trim the list to (history_reboot_reason_size - 1)
ssize_t max = history_reboot_reason_size;
for (auto it = reason_history.begin(); it != reason_history.end();) {
if (it->empty() || (last == *it) || (marked_system_boot_reason == *it) || (--max <= 0)) {
it = reason_history.erase(it);
} else {
last = *it;
++it;
}
}
}
// insert at the front, concatenating mark (<epoch time>) detail to the value.
reason_history.insert(reason_history.begin(), marked_system_boot_reason);
// If the property string is too long ( > PROPERTY_VALUE_MAX)
// we get an error, so trim out last entry and try again.
while (!android::base::SetProperty(history_reboot_reason_property,
android::base::Join(reason_history, '\n'))) {
auto it = std::prev(reason_history.end());
if (it == reason_history.end()) break;
reason_history.erase(it);
}
}
// Scrub, Sanitize, Standardize and Enhance the boot reason string supplied.
std::string BootReasonStrToReason(const std::string& boot_reason) {
auto ret = android::base::GetProperty(system_reboot_reason_property, "");
std::string reason(boot_reason);
// If sys.boot.reason == ro.boot.bootreason, let's re-evaluate
if (reason == ret) ret = "";
transformReason(reason);
// Is the current system boot reason sys.boot.reason valid?
if (!isKnownRebootReason(ret)) ret = "";
if (ret == "") {
// Is the bootloader boot reason ro.boot.bootreason known?
std::vector<std::string> words(android::base::Split(reason, ",_-"));
for (auto& s : knownReasons) {
std::string blunt;
for (auto& r : words) {
if (r == s) {
if (isBluntRebootReason(s)) {
blunt = s;
} else {
ret = s;
break;
}
}
}
if (ret == "") ret = blunt;
if (ret != "") break;
}
}
if (ret == "") {
// A series of checks to take some officially unsupported reasons
// reported by the bootloader and find some logical and canonical
// sense. In an ideal world, we would require those bootloaders
// to behave and follow our CTS standards.
//
// first member is the output
// second member is an unanchored regex for an alias
//
// If output has a prefix of <bang> '!', we do not use it as a
// match needle (and drop the <bang> prefix when landing in output),
// otherwise look for it as well. This helps keep the scale of the
// following table smaller.
static const std::vector<std::pair<const std::string, const std::string>> aliasReasons = {
{"watchdog", "wdog"},
{"kernel_panic", "panic"},
{"shutdown,thermal", "thermal"},
{"warm,s3_wakeup", "s3_wakeup"},
{"hard,hw_reset", "hw_reset"},
{"cold,charger", "usb|power_on_cable"},
{"cold,powerkey", "powerkey|power_key|PowerKey|power_on"},
{"cold,rtc", "rtc"},
{"cold,rtc,2sec", "2sec_reboot"},
{"!warm", "wdt_by_pass_pwk"}, // change flavour of blunt
{"!reboot", "^wdt$"}, // change flavour of blunt