// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "crash-reporter/kernel_collector_test.h"

#include <unistd.h>
#include <cinttypes>
#include <base/files/file_util.h>
#include <base/files/scoped_temp_dir.h>
#include <base/strings/string_util.h>
#include <base/strings/stringprintf.h>
#include <brillo/syslog_logging.h>
#include <gtest/gtest.h>

#include "crash-reporter/test_util.h"

using base::FilePath;
using base::StringPrintf;
using brillo::FindLog;
using brillo::GetLog;

namespace {

const int kMaxEfiParts = 100;
bool s_metrics = false;

bool IsMetrics() {
  return s_metrics;
}

}  // namespace

class KernelCollectorTest : public ::testing::Test {
 protected:
  void SetUpSuccessfulCollect();
  void SetUpSuccessfulWatchdog(const FilePath&);
  void ComputeKernelStackSignatureCommon(KernelCollector::ArchKind arch);
  void WatchdogOptedOutHelper(const FilePath&);
  void WatchdogOKHelper(const FilePath&);
  void WatchdogOnlyLastBootHelper(const FilePath&);

  const FilePath& console_ramoops_file() const { return test_console_ramoops_; }
  const FilePath& console_ramoops_file_old() const {
    return test_console_ramoops_old_;
  }
  const FilePath& eventlog_file() const { return test_eventlog_; }
  const FilePath& bios_log_file() const { return test_bios_log_; }
  const FilePath& kcrash_file() const { return test_kcrash_; }
  const FilePath& efikcrash_file(int part) const {
    return test_efikcrash_[part];
  }
  const FilePath& test_crash_directory() const { return test_crash_directory_; }

  KernelCollectorMock collector_;

 private:
  void SetUp() override {
    s_metrics = true;

    EXPECT_CALL(collector_, SetUpDBus()).WillRepeatedly(testing::Return());

    collector_.Initialize(IsMetrics, false);
    ASSERT_TRUE(scoped_temp_dir_.CreateUniqueTempDir());
    test_kcrash_ = scoped_temp_dir_.GetPath().Append("kcrash");
    ASSERT_TRUE(base::CreateDirectory(test_kcrash_));
    collector_.OverridePreservedDumpPath(test_kcrash_);

    test_console_ramoops_ = test_kcrash_.Append("console-ramoops-0");
    ASSERT_FALSE(base::PathExists(test_console_ramoops_));
    test_console_ramoops_old_ = test_kcrash_.Append("console-ramoops");
    ASSERT_FALSE(base::PathExists(test_console_ramoops_old_));
    for (int i = 0; i < kMaxEfiParts; i++) {
      test_efikcrash_[i] = test_kcrash_.Append(StringPrintf(
          "dmesg-efi-%" PRIu64, (9876543210 * 100 + i) * 1000 + 1));
      ASSERT_FALSE(base::PathExists(test_efikcrash_[i]));
    }
    test_kcrash_ = test_kcrash_.Append("dmesg-ramoops-0");
    ASSERT_FALSE(base::PathExists(test_kcrash_));

    test_crash_directory_ =
        scoped_temp_dir_.GetPath().Append("crash_directory");
    ASSERT_TRUE(base::CreateDirectory(test_crash_directory_));

    test_eventlog_ = scoped_temp_dir_.GetPath().Append("eventlog.txt");
    ASSERT_FALSE(base::PathExists(test_eventlog_));
    collector_.OverrideEventLogPath(test_eventlog_);

    test_bios_log_ = scoped_temp_dir_.GetPath().Append("bios_log");
    ASSERT_FALSE(base::PathExists(test_bios_log_));
    collector_.OverrideBiosLogPath(test_bios_log_);
    brillo::ClearLog();
  }

  FilePath test_console_ramoops_;
  FilePath test_console_ramoops_old_;
  FilePath test_eventlog_;
  FilePath test_bios_log_;
  FilePath test_kcrash_;
  FilePath test_efikcrash_[kMaxEfiParts];
  FilePath test_crash_directory_;
  base::ScopedTempDir scoped_temp_dir_;
};

TEST_F(KernelCollectorTest, ParseEfiCrashId) {
  uint64_t test_efi_crash_id = 150989600314002;
  EXPECT_EQ(1509896003,
            KernelCollector::EfiCrash::GetTimestamp(test_efi_crash_id));
  EXPECT_EQ(14, KernelCollector::EfiCrash::GetPart(test_efi_crash_id));
  EXPECT_EQ(2, KernelCollector::EfiCrash::GetCrashCount(test_efi_crash_id));
  EXPECT_EQ(test_efi_crash_id,
            KernelCollector::EfiCrash::GenerateId(1509896003, 14, 2));
}

TEST_F(KernelCollectorTest, GetEfiCrashType) {
  ASSERT_FALSE(base::PathExists(efikcrash_file(1)));
  std::string type;
  uint64_t test_efi_crash_id;
  sscanf(efikcrash_file(1).BaseName().value().c_str(), "%*10s%" PRIu64,
         &test_efi_crash_id);
  // Write header.
  ASSERT_TRUE(test_util::CreateFile(efikcrash_file(1), "Panic#1 Part#20"));
  KernelCollector::EfiCrash efi_crash(test_efi_crash_id, collector_);
  ASSERT_TRUE(efi_crash.GetType(&type));
  EXPECT_EQ("Panic", type);
}

TEST_F(KernelCollectorTest, LoadEfiCrash) {
  int efi_part_count = kMaxEfiParts - 1;
  std::string efi_part[kMaxEfiParts];
  std::string expected_dump;
  std::string dump;
  uint64_t test_efi_crash_id;
  sscanf(efikcrash_file(1).BaseName().value().c_str(), "%*10s%" PRIu64,
         &test_efi_crash_id);

  for (int i = 1; i <= efi_part_count; i++) {
    ASSERT_FALSE(base::PathExists(efikcrash_file(i)));
    efi_part[i] = StringPrintf("Panic#100 Part#%d\n", i);
    for (int j = 0; j < i; j++) {
      efi_part[i].append(StringPrintf("random blob %d\n", j));
    }
    ASSERT_TRUE(test_util::CreateFile(efikcrash_file(i), efi_part[i].c_str()));
  }
  KernelCollector::EfiCrash efi_crash(test_efi_crash_id, collector_);
  efi_crash.UpdateMaxPart(efi_crash.GetIdForPart(efi_part_count));
  ASSERT_TRUE(efi_crash.Load(&dump));

  // Stitch parts in reverse order.
  for (int i = efi_part_count; i > 0; i--) {
    // Strip first line since it contains header.
    expected_dump.append(efi_part[i], efi_part[i].find('\n') + 1,
                         std::string::npos);
  }
  EXPECT_EQ(expected_dump, dump);
}

TEST_F(KernelCollectorTest, ComputeKernelStackSignatureBase) {
  // Make sure the normal build architecture is detected
  EXPECT_NE(KernelCollector::kArchUnknown, collector_.arch());
}

TEST_F(KernelCollectorTest, LoadPreservedDump) {
  ASSERT_FALSE(base::PathExists(kcrash_file()));
  std::string dump;
  dump.clear();

  ASSERT_TRUE(test_util::CreateFile(
      kcrash_file(), "CrashRecordWithoutRamoopsHeader\n<6>[    0.078852]"));
  ASSERT_TRUE(collector_.LoadParameters());
  ASSERT_TRUE(collector_.LoadPreservedDump(&dump));
  ASSERT_EQ("CrashRecordWithoutRamoopsHeader\n<6>[    0.078852]", dump);

  ASSERT_TRUE(test_util::CreateFile(kcrash_file(), "====1.1\nsomething"));
  ASSERT_TRUE(collector_.LoadParameters());
  ASSERT_TRUE(collector_.LoadPreservedDump(&dump));
  ASSERT_EQ("something", dump);

  ASSERT_TRUE(
      test_util::CreateFile(kcrash_file(), "\x01\x02\xfe\xff random blob"));
  ASSERT_TRUE(collector_.LoadParameters());
  ASSERT_FALSE(collector_.LoadPreservedDump(&dump));
  ASSERT_EQ("", dump);
}

TEST_F(KernelCollectorTest, LoadBiosLog) {
  std::string dump;
  dump.clear();

  std::string bootblock_boot_1 =
      "\n\ncoreboot-dc417eb Tue Nov 2 20:47:41 UTC 2016 bootblock starting"
      " (log level: 7)...\n"
      "This is boot 1 bootblock!\n"
      "\n\ncoreboot-dc417eb Tue Nov 2 20:47:41 UTC 2016 verstage starting"
      " (log level: 7)...\n"
      "This is boot 1 verstage!\n";
  std::string romstage_boot_1 =
      "\n\ncoreboot-e8dd2d8 Tue Mar 14 23:29:43 UTC 2017 romstage starting...\n"
      "This is boot 1 romstage!\n"
      "\n\ncoreboot-e8dd2d8 Tue Mar 14 23:29:43 UTC 2017 ramstage starting...\n"
      "This is boot 1 ramstage!\n"
      "\n\nStarting depthcharge on kevin...\n"
      "This is boot 1 depthcharge!\n"
      "jumping to kernel\n"
      "Some more messages logged at runtime, maybe without terminating newline";
  std::string bootblock_boot_2 =
      "\n\ncoreboot-dc417eb Tue Nov 2 20:47:41 UTC 2016 bootblock starting...\n"
      "This is boot 2 bootblock!\n"
      "\n\ncoreboot-dc417eb Tue Nov 2 20:47:41 UTC 2016 verstage starting...\n"
      "This is boot 2 verstage!\n";
  std::string romstage_boot_2 =
      "\n\ncoreboot-e8dd2d8 Tue Mar 14 23:29:43 UTC 2017 romstage starting...\n"
      "This is boot 2 romstage!\n"
      "\n\ncoreboot-e8dd2d8 Tue Mar 14 23:29:43 UTC 2017 ramstage starting...\n"
      "This is boot 2 ramstage!\n"
      "\n\nStarting depthcharge on kevin...\n"
      "This is boot 2 depthcharge!\n"
      "jumping to kernel\n"
      "Some more messages logged at runtime, maybe without terminating newline";

  // Normal situation of multiple boots in log.
  ASSERT_TRUE(test_util::CreateFile(
      bios_log_file(),
      ("Some old lines from boot N-3\n" +    // N-3
       bootblock_boot_2 + romstage_boot_2 +  // N-2
       bootblock_boot_1 + romstage_boot_1 +  // N-1 (the "last" boot)
       bootblock_boot_2 + romstage_boot_2)   // N ("current" boot, after crash)
          .c_str()));
  ASSERT_TRUE(collector_.LoadLastBootBiosLog(&dump));
  ASSERT_EQ(bootblock_boot_1 + romstage_boot_1, "\n" + dump);

  // Same on a board that cannot log pre-romstage.
  ASSERT_TRUE(test_util::CreateFile(
      bios_log_file(),
      (romstage_boot_2 + romstage_boot_1 + romstage_boot_2).c_str()));
  ASSERT_TRUE(collector_.LoadLastBootBiosLog(&dump));
  ASSERT_EQ(romstage_boot_1, "\n" + dump);

  // Logs from previous boot were lost.
  ASSERT_TRUE(test_util::CreateFile(
      bios_log_file(), (bootblock_boot_1 + romstage_boot_1).c_str()));
  ASSERT_FALSE(collector_.LoadLastBootBiosLog(&dump));
  ASSERT_EQ("", dump);

  // No recognizable BIOS log.
  ASSERT_TRUE(test_util::CreateFile(bios_log_file(), "random crud\n"));
  ASSERT_FALSE(collector_.LoadLastBootBiosLog(&dump));
  ASSERT_EQ("", dump);
}

TEST_F(KernelCollectorTest, EnableMissingKernel) {
  ASSERT_FALSE(collector_.Enable());
  ASSERT_FALSE(collector_.is_enabled());
  ASSERT_TRUE(FindLog("Kernel does not support crash dumping"));
}

TEST_F(KernelCollectorTest, EnableOK) {
  ASSERT_TRUE(test_util::CreateFile(kcrash_file(), ""));
  EXPECT_CALL(collector_, DumpDirMounted()).WillOnce(::testing::Return(true));
  ASSERT_TRUE(collector_.Enable());
  ASSERT_TRUE(collector_.is_enabled());
  ASSERT_TRUE(FindLog("Enabling kernel crash handling"));
}

TEST_F(KernelCollectorTest, CollectPreservedFileMissing) {
  ASSERT_FALSE(collector_.Collect());
  ASSERT_FALSE(FindLog("Stored kcrash to "));
}

TEST_F(KernelCollectorTest, CollectBadDirectory) {
  ASSERT_TRUE(test_util::CreateFile(kcrash_file(), "====1.1\nsomething"));
  ASSERT_TRUE(collector_.Collect());
  ASSERT_TRUE(FindLog("Unable to create crash directory"))
      << "Did not find expected error string in log: {\n"
      << GetLog() << "}";
}

void KernelCollectorTest::SetUpSuccessfulCollect() {
  collector_.set_crash_directory_for_test(test_crash_directory());
  ASSERT_TRUE(test_util::CreateFile(kcrash_file(), "====1.1\nsomething"));
}

void KernelCollectorTest::SetUpSuccessfulWatchdog(const FilePath& path) {
  collector_.set_crash_directory_for_test(test_crash_directory());
  ASSERT_TRUE(test_util::CreateFile(
      eventlog_file(),
      "112 | 2016-03-24 15:09:39 | System boot | 0\n"
      "113 | 2016-03-24 15:11:20 | System boot | 0\n"
      "114 | 2016-03-24 15:11:20 | Hardware watchdog reset\n"));
  ASSERT_TRUE(test_util::CreateFile(path, "\n[ 0.0000] I can haz boot!"));
}

TEST_F(KernelCollectorTest, CollectOptedOut) {
  SetUpSuccessfulCollect();
  s_metrics = false;
  ASSERT_TRUE(collector_.Collect());
  ASSERT_TRUE(FindLog("(ignoring - no consent)"));
}

void KernelCollectorTest::WatchdogOptedOutHelper(const FilePath& path) {
  SetUpSuccessfulWatchdog(path);
  s_metrics = false;
  ASSERT_TRUE(collector_.Collect());
  ASSERT_TRUE(FindLog("(ignoring - no consent)"));
}

TEST_F(KernelCollectorTest, WatchdogOptedOut) {
  WatchdogOptedOutHelper(console_ramoops_file());
}

TEST_F(KernelCollectorTest, WatchdogOptedOutOld) {
  WatchdogOptedOutHelper(console_ramoops_file_old());
}

TEST_F(KernelCollectorTest, CollectOK) {
  SetUpSuccessfulCollect();
  ASSERT_TRUE(test_util::CreateFile(
      bios_log_file(),
      "BIOS Messages"
      "\n\ncoreboot-dc417eb Tue Nov 2 bootblock starting...\n"));
  ASSERT_TRUE(collector_.Collect());
  ASSERT_TRUE(FindLog("(handling)"));
  static const char kNamePrefix[] = "Stored kcrash to ";
  std::string log = brillo::GetLog();
  size_t pos = log.find(kNamePrefix);
  ASSERT_NE(std::string::npos, pos)
      << "Did not find string \"" << kNamePrefix << "\" in log: {\n"
      << log << "}";
  pos += strlen(kNamePrefix);
  std::string filename = log.substr(pos, std::string::npos);
  // Take the name up until \n
  size_t end_pos = filename.find_first_of("\n");
  ASSERT_NE(std::string::npos, end_pos);
  filename = filename.substr(0, end_pos);
  ASSERT_EQ(0, filename.find(test_crash_directory().value()));
  FilePath path(filename);
  ASSERT_TRUE(base::PathExists(path));
  std::string contents;
  ASSERT_TRUE(base::ReadFileToString(path, &contents));
  ASSERT_EQ("something", contents);
  // Check that BIOS log was collected as well.
  path = path.ReplaceExtension("bios_log");
  ASSERT_TRUE(base::PathExists(path));
  ASSERT_TRUE(base::ReadFileToString(path, &contents));
  ASSERT_EQ("BIOS Messages", contents);
  // Confirm that files are correctly described in .meta file.
  path = path.ReplaceExtension("meta");
  ASSERT_TRUE(base::PathExists(path));
  ASSERT_TRUE(base::ReadFileToString(path, &contents));
  ASSERT_TRUE(
      contents.find("payload=" + path.ReplaceExtension("kcrash").value()) !=
      std::string::npos);
  ASSERT_TRUE(contents.find("upload_file_bios_log=" +
                            path.ReplaceExtension("bios_log").value()) !=
              std::string::npos);
}

void KernelCollectorTest::WatchdogOKHelper(const FilePath& path) {
  SetUpSuccessfulWatchdog(path);
  ASSERT_TRUE(collector_.Collect());
  ASSERT_TRUE(FindLog("(handling)"));
  ASSERT_TRUE(FindLog("kernel-(WATCHDOG)-I can haz"));
}

TEST_F(KernelCollectorTest, BiosCrashArmOK) {
  collector_.set_crash_directory_for_test(test_crash_directory());
  collector_.set_arch(KernelCollector::kArchArm);
  ASSERT_TRUE(test_util::CreateFile(
      bios_log_file(),
      "PANIC in EL3 at x30 = 0x00003698"
      "\n\ncoreboot-dc417eb Tue Nov 2 bootblock starting...\n"));
  ASSERT_TRUE(collector_.Collect());
  ASSERT_TRUE(FindLog("(handling)"));
  ASSERT_TRUE(FindLog("bios-(PANIC)-0x00003698"));
}

TEST_F(KernelCollectorTest, WatchdogOK) {
  WatchdogOKHelper(console_ramoops_file());
}

TEST_F(KernelCollectorTest, WatchdogOKOld) {
  WatchdogOKHelper(console_ramoops_file_old());
}

void KernelCollectorTest::WatchdogOnlyLastBootHelper(const FilePath& path) {
  char next[] = "115 | 2016-03-24 15:24:27 | System boot | 0";
  SetUpSuccessfulWatchdog(path);
  ASSERT_TRUE(test_util::CreateFile(eventlog_file(), next));
  ASSERT_FALSE(collector_.Collect());
}

TEST_F(KernelCollectorTest, WatchdogOnlyLastBoot) {
  WatchdogOnlyLastBootHelper(console_ramoops_file());
}

TEST_F(KernelCollectorTest, WatchdogOnlyLastBootOld) {
  WatchdogOnlyLastBootHelper(console_ramoops_file_old());
}

// Perform tests which are common across architectures
void KernelCollectorTest::ComputeKernelStackSignatureCommon(
    KernelCollector::ArchKind arch) {
  collector_.set_arch(arch);

  const char kStackButNoPC[] =
      "<4>[ 6066.829029]  [<790340af>] __do_softirq+0xa6/0x143\n";
  EXPECT_EQ("kernel--83615F0A",
            collector_.ComputeKernelStackSignature(kStackButNoPC));

  const char kMissingEverything[] =
      "<4>[ 6066.829029]  [<790340af>] ? __do_softirq+0xa6/0x143\n";
  EXPECT_EQ("kernel-UnspecifiedStackSignature",
            collector_.ComputeKernelStackSignature(kMissingEverything));

  // Long message.
  const char kTruncatedMessage[] =
      "<0>[   87.485611] Kernel panic - not syncing: 01234567890123456789"
      "01234567890123456789X\n";
  EXPECT_EQ("kernel-0123456789012345678901234567890123456789-00000000",
            collector_.ComputeKernelStackSignature(kTruncatedMessage));
}

TEST_F(KernelCollectorTest, ComputeKernelStackSignatureARM) {
  const char kBugToPanic[] =
      "<5>[  123.412524] Modules linked in:\n"
      "<5>[  123.412534] CPU: 0    Tainted: G        W    "
      "(2.6.37-01030-g51cee64 #153)\n"
      "<5>[  123.412552] PC is at write_breakme+0xd0/0x1b4\n"
      "<5>[  123.412560] LR is at write_breakme+0xc8/0x1b4\n"
      "<5>[  123.412569] pc : [<c0058220>]    lr : [<c005821c>]    "
      "psr: 60000013\n"
      "<5>[  123.412574] sp : f4e0ded8  ip : c04d104c  fp : 000e45e0\n"
      "<5>[  123.412581] r10: 400ff000  r9 : f4e0c000  r8 : 00000004\n"
      "<5>[  123.412589] r7 : f4e0df80  r6 : f4820c80  r5 : 00000004  "
      "r4 : f4e0dee8\n"
      "<5>[  123.412598] r3 : 00000000  r2 : f4e0decc  r1 : c05f88a9  "
      "r0 : 00000039\n"
      "<5>[  123.412608] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA "
      "ARM  Segment user\n"
      "<5>[  123.412617] Control: 10c53c7d  Table: 34dcc04a  DAC: 00000015\n"
      "<0>[  123.412626] Process bash (pid: 1014, stack limit = 0xf4e0c2f8)\n"
      "<0>[  123.412634] Stack: (0xf4e0ded8 to 0xf4e0e000)\n"
      "<0>[  123.412641] dec0:                                              "
      "         f4e0dee8 c0183678\n"
      "<0>[  123.412654] dee0: 00000000 00000000 00677562 0000081f c06a6a78 "
      "400ff000 f4e0dfb0 00000000\n"
      "<0>[  123.412666] df00: bec7ab44 000b1719 bec7ab0c c004f498 bec7a314 "
      "c024acc8 00000001 c018359c\n"
      "<0>[  123.412679] df20: f4e0df34 c04d10fc f5803c80 271beb39 000e45e0 "
      "f5803c80 c018359c c017bfe0\n"
      "<0>[  123.412691] df40: 00000004 f4820c80 400ff000 f4e0df80 00000004 "
      "f4e0c000 00000000 c01383e4\n"
      "<0>[  123.412703] df60: f4820c80 400ff000 f4820c80 400ff000 00000000 "
      "00000000 00000004 c0138578\n"
      "<0>[  123.412715] df80: 00000000 00000000 00000004 00000000 00000004 "
      "402f95d0 00000004 00000004\n"
      "<0>[  123.412727] dfa0: c0054984 c00547c0 00000004 402f95d0 00000001 "
      "400ff000 00000004 00000000\n"
      "<0>[  123.412739] dfc0: 00000004 402f95d0 00000004 00000004 400ff000 "
      "000c194c bec7ab58 000e45e0\n"
      "<0>[  123.412751] dfe0: 00000000 bec7aad8 40232520 40284e9c 60000010 "
      "00000001 00000000 00000000\n"
      "<5>[   39.496577] Backtrace:\n"
      "<5>[  123.412782] [<c0058220>] (__bug+0x20/0x2c) from [<c0183678>] "
      "(write_breakme+0xdc/0x1bc)\n"
      "<5>[  123.412798] [<c0183678>] (write_breakme+0xdc/0x1bc) from "
      "[<c017bfe0>] (proc_reg_write+0x88/0x9c)\n";

  collector_.set_arch(KernelCollector::kArchArm);
  EXPECT_EQ("kernel-write_breakme-97D3E92F",
            collector_.ComputeKernelStackSignature(kBugToPanic));
}

TEST_F(KernelCollectorTest, ComputeKernelStackSignatureMIPS) {
  const char kBugToPanic[] =
      "<5>[ 3378.472000] lkdtm: Performing direct entry BUG\n"
      "<5>[ 3378.476000] Kernel bug detected[#1]:\n"
      "<5>[ 3378.484000] CPU: 0 PID: 185 Comm: dash Not tainted 3.14.0 #1\n"
      "<5>[ 3378.488000] task: 8fed5220 ti: 8ec4a000 task.ti: 8ec4a000\n"
      "<5>[ 3378.496000] $ 0   : 00000000 804018b8 804010f0 7785b507\n"
      "<5>[ 3378.500000] $ 4   : 8061ab64 81204478 81205b20 00000000\n"
      "<5>[ 3378.508000] $ 8   : 80830000 20746365 72746e65 55422079\n"
      "<5>[ 3378.512000] $12   : 8ec4be94 000000fc 00000000 00000048\n"
      "<5>[ 3378.520000] $16   : 00000004 8ef54000 80710000 00000002\n"
      "<5>[ 3378.528000] $20   : 7765b6d4 00000004 7fffffff 00000002\n"
      "<5>[ 3378.532000] $24   : 00000001 803dc0dc                  \n"
      "<5>[ 3378.540000] $28   : 8ec4a000 8ec4be20 7775438d 804018b8\n"
      "<5>[ 3378.544000] Hi    : 00000000\n"
      "<5>[ 3378.548000] Lo    : 49bf8080\n"
      "<5>[ 3378.552000] epc   : 804010f0 lkdtm_do_action+0x68/0x3f8\n"
      "<5>[ 3378.560000]     Not tainted\n"
      "<5>[ 3378.564000] ra    : 804018b8 direct_entry+0x110/0x154\n"
      "<5>[ 3378.568000] Status: 3100dc03 KERNEL EXL IE \n"
      "<5>[ 3378.572000] Cause : 10800024\n"
      "<5>[ 3378.576000] PrId  : 0001a120 (MIPS interAptiv (multi))\n"
      "<5>[ 3378.580000] Modules linked in: uinput cfg80211 nf_conntrack_ipv6 "
      "nf_defrag_ipv6 ip6table_filter ip6_tables pcnet32 mii fuse "
      "ppp_async ppp_generic slhc tun\n"
      "<5>[ 3378.600000] Process dash (pid: 185, threadinfo=8ec4a000, "
      "task=8fed5220, tls=77632490)\n"
      "<5>[ 3378.608000] Stack : 00000006 ffffff9c 00000000 00000000 00000000 "
      "00000000 8083454a 00000022\n"
      "<5>          7765baa1 00001fee 80710000 8ef54000 8ec4bf08 00000002 "
      "7765b6d4 00000004\n"
      "<5>          7fffffff 00000002 7775438d 805e5158 7fffffff 00000002 "
      "00000000 7785b507\n"
      "<5>          806a96bc 00000004 8ef54000 8ec4bf08 00000002 804018b8 "
      "80710000 806a98bc\n"
      "<5>          00000002 00000020 00000004 8d515600 77756450 00000004 "
      "8ec4bf08 802377e4\n"
      "<5>          ...\n"
      "<5>[ 3378.652000] Call Trace:\n"
      "<5>[ 3378.656000] [<804010f0>] lkdtm_do_action+0x68/0x3f8\n"
      "<5>[ 3378.660000] [<804018b8>] direct_entry+0x110/0x154\n"
      "<5>[ 3378.664000] [<802377e4>] vfs_write+0xe0/0x1bc\n"
      "<5>[ 3378.672000] [<80237f90>] SyS_write+0x78/0xf8\n"
      "<5>[ 3378.676000] [<80111888>] handle_sys+0x128/0x14c\n"
      "<5>[ 3378.680000] \n"
      "<5>[ 3378.684000] \n"
      "<5>Code: 3c04806b  0c1793aa  248494f0 <000c000d> 3c04806b  248494fc  "
      "0c04cc7f  2405017a  08100514 \n"
      "<5>[ 3378.696000] ---[ end trace 75067432f24bbc93 ]---\n";

  collector_.set_arch(KernelCollector::kArchMips);
  EXPECT_EQ("kernel-lkdtm_do_action-5E600A6B",
            collector_.ComputeKernelStackSignature(kBugToPanic));
}

TEST_F(KernelCollectorTest, ComputeKernelStackSignatureX86) {
  const char kBugToPanic[] =
      "<4>[ 6066.829029]  [<79039d16>] ? run_timer_softirq+0x165/0x1e6\n"
      "<4>[ 6066.829029]  [<790340af>] ignore_old_stack+0xa6/0x143\n"
      "<0>[ 6066.829029] EIP: [<b82d7c15>] ieee80211_stop_tx_ba_session+"
      "0xa3/0xb5 [mac80211] SS:ESP 0068:7951febc\n"
      "<0>[ 6066.829029] CR2: 00000000323038a7\n"
      "<4>[ 6066.845422] ---[ end trace 12b058bb46c43500 ]---\n"
      "<0>[ 6066.845747] Kernel panic - not syncing: Fatal exception "
      "in interrupt\n"
      "<0>[ 6066.846902] Call Trace:\n"
      "<4>[ 6066.846902]  [<7937a07b>] ? printk+0x14/0x19\n"
      "<4>[ 6066.949779]  [<79379fc1>] panic+0x3e/0xe4\n"
      "<4>[ 6066.949971]  [<7937c5c5>] oops_end+0x73/0x81\n"
      "<4>[ 6066.950208]  [<7901b260>] no_context+0x10d/0x117\n";

  collector_.set_arch(KernelCollector::kArchX86);
  EXPECT_EQ("kernel-ieee80211_stop_tx_ba_session-DE253569",
            collector_.ComputeKernelStackSignature(kBugToPanic));

  const char kPCButNoStack[] =
      "<0>[ 6066.829029] EIP: [<b82d7c15>] ieee80211_stop_tx_ba_session+";
  EXPECT_EQ("kernel-ieee80211_stop_tx_ba_session-00000000",
            collector_.ComputeKernelStackSignature(kPCButNoStack));

  const char kBreakmeBug[] =
      "<4>[  180.492137]  [<790970c6>] ? handle_mm_fault+0x67f/0x96d\n"
      "<4>[  180.492137]  [<790dcdfe>] ? proc_reg_write+0x5f/0x73\n"
      "<4>[  180.492137]  [<790e2224>] ? write_breakme+0x0/0x108\n"
      "<4>[  180.492137]  [<790dcd9f>] ? proc_reg_write+0x0/0x73\n"
      "<4>[  180.492137]  [<790ac0aa>] vfs_write+0x85/0xe4\n"
      "<0>[  180.492137] Code: c6 44 05 b2 00 89 d8 e8 0c ef 09 00 85 c0 75 "
      "0b c7 00 00 00 00 00 e9 8e 00 00 00 ba e6 75 4b 79 89 d8 e8 f1 ee 09 "
      "00 85 c0 75 04 <0f> 0b eb fe ba 58 47 49 79 89 d8 e8 dd ee 09 00 85 "
      "c0 75 0a 68\n"
      "<0>[  180.492137] EIP: [<790e22a4>] write_breakme+0x80/0x108 SS:ESP "
      "0068:aa3e9efc\n"
      "<4>[  180.501800] ---[ end trace 2a6b72965e1b1523 ]---\n"
      "<0>[  180.502026] Kernel panic - not syncing: Fatal exception\n"
      "<4>[  180.502026] Call Trace:\n"
      "<4>[  180.502806]  [<79379aba>] ? printk+0x14/0x1a\n"
      "<4>[  180.503033]  [<79379a00>] panic+0x3e/0xe4\n"
      "<4>[  180.503287]  [<7937c005>] oops_end+0x73/0x81\n"
      "<4>[  180.503520]  [<790055dd>] die+0x58/0x5e\n"
      "<4>[  180.503538]  [<7937b96c>] do_trap+0x8e/0xa7\n"
      "<4>[  180.503555]  [<79003d70>] ? do_invalid_op+0x0/0x80\n";
  EXPECT_EQ("kernel-write_breakme-122AB3CD",
            collector_.ComputeKernelStackSignature(kBreakmeBug));

  const char kPCLineTooOld[] =
      "<4>[  174.492137]  [<790970c6>] ignored_function+0x67f/0x96d\n"
      "<4>[  175.492137]  [<790970c6>] ignored_function2+0x67f/0x96d\n"
      "<0>[  174.492137] EIP: [<790e22a4>] write_breakme+0x80/0x108 SS:ESP "
      "0068:aa3e9efc\n"
      "<4>[  180.501800] ---[ end trace 2a6b72965e1b1523 ]---\n"
      "<4>[  180.502026] Call Trace:\n"
      "<0>[  180.502026] Kernel panic - not syncing: Fatal exception\n"
      "<4>[  180.502806]  [<79379aba>] printk+0x14/0x1a\n";
  EXPECT_EQ("kernel-Fatal exception-ED4C84FE",
            collector_.ComputeKernelStackSignature(kPCLineTooOld));

  // Panic without EIP line.
  const char kExamplePanicOnly[] =
      "<0>[   87.485611] Kernel panic - not syncing: Testing panic\n"
      "<4>[   87.485630] Pid: 2825, comm: bash Tainted: G         "
      "C 2.6.32.23+drm33.10 #1\n"
      "<4>[   87.485639] Call Trace:\n"
      "<4>[   87.485660]  [<8133f71d>] ? printk+0x14/0x17\n"
      "<4>[   87.485674]  [<8133f663>] panic+0x3e/0xe4\n"
      "<4>[   87.485689]  [<810d062e>] write_breakme+0xaa/0x124\n";
  EXPECT_EQ("kernel-Testing panic-E0FC3552",
            collector_.ComputeKernelStackSignature(kExamplePanicOnly));

  // Panic from hung task.
  const char kHungTaskBreakMe[] =
      "<3>[  720.459157] INFO: task bash:2287 blocked blah blah\n"
      "<5>[  720.459282] Call Trace:\n"
      "<5>[  720.459307]  [<810a457b>] ? __dentry_open+0x186/0x23e\n"
      "<5>[  720.459323]  [<810b9c71>] ? mntput_no_expire+0x29/0xe2\n"
      "<5>[  720.459336]  [<810b9d48>] ? mntput+0x1e/0x20\n"
      "<5>[  720.459350]  [<810ad135>] ? path_put+0x1a/0x1d\n"
      "<5>[  720.459366]  [<8137cacc>] schedule+0x4d/0x4f\n"
      "<5>[  720.459379]  [<8137ccfb>] schedule_timeout+0x26/0xaf\n"
      "<5>[  720.459394]  [<8102127e>] ? should_resched+0xd/0x27\n"
      "<5>[  720.459409]  [<81174d1f>] ? _copy_from_user+0x3c/0x50\n"
      "<5>[  720.459423]  [<8137cd9e>] "
      "schedule_timeout_uninterruptible+0x1a/0x1c\n"
      "<5>[  720.459438]  [<810dee63>] write_breakme+0xb3/0x178\n"
      "<5>[  720.459453]  [<810dedb0>] ? meminfo_proc_show+0x2f2/0x2f2\n"
      "<5>[  720.459467]  [<810d94ae>] proc_reg_write+0x6d/0x87\n"
      "<5>[  720.459481]  [<810d9441>] ? proc_reg_poll+0x76/0x76\n"
      "<5>[  720.459493]  [<810a5e9e>] vfs_write+0x79/0xa5\n"
      "<5>[  720.459505]  [<810a6011>] sys_write+0x40/0x65\n"
      "<5>[  720.459519]  [<8137e677>] sysenter_do_call+0x12/0x26\n"
      "<0>[  720.459530] Kernel panic - not syncing: hung_task: blocked tasks\n"
      "<5>[  720.459768] Pid: 31, comm: khungtaskd Tainted: "
      "G         C  3.0.8 #1\n"
      "<5>[  720.459998] Call Trace:\n"
      "<5>[  720.460140]  [<81378a35>] panic+0x53/0x14a\n"
      "<5>[  720.460312]  [<8105f875>] watchdog+0x15b/0x1a0\n"
      "<5>[  720.460495]  [<8105f71a>] ? hung_task_panic+0x16/0x16\n"
      "<5>[  720.460693]  [<81043af3>] kthread+0x67/0x6c\n"
      "<5>[  720.460862]  [<81043a8c>] ? __init_kthread_worker+0x2d/0x2d\n"
      "<5>[  720.461106]  [<8137eb9e>] kernel_thread_helper+0x6/0x10\n";
  EXPECT_EQ("kernel-(HANG)-hung_task: blocked tasks-600B37EA",
            collector_.ComputeKernelStackSignature(kHungTaskBreakMe));

  // Panic with all question marks in the last stack trace.
  const char kUncertainStackTrace[] =
      "<0>[56279.689669] ------------[ cut here ]------------\n"
      "<2>[56279.689677] kernel BUG at /build/x86-alex/tmp/portage/"
      "sys-kernel/chromeos-kernel-0.0.1-r516/work/chromeos-kernel-0.0.1/"
      "kernel/timer.c:844!\n"
      "<0>[56279.689683] invalid opcode: 0000 [#1] SMP \n"
      "<0>[56279.689688] last sysfs file: /sys/power/state\n"
      "<5>[56279.689692] Modules linked in: nls_iso8859_1 nls_cp437 vfat fat "
      "gobi usbnet tsl2583(C) industrialio(C) snd_hda_codec_realtek "
      "snd_hda_intel i2c_dev snd_hda_codec snd_hwdep qcserial snd_pcm usb_wwan "
      "i2c_i801 snd_timer nm10_gpio snd_page_alloc rtc_cmos fuse "
      "nf_conntrack_ipv6 nf_defrag_ipv6 uvcvideo videodev ip6table_filter "
      "ath9k ip6_tables ipv6 mac80211 ath9k_common ath9k_hw ath cfg80211 "
      "xt_mark\n"
      "<5>[56279.689731] \n"
      "<5>[56279.689738] Pid: 24607, comm: powerd_suspend Tainted: G        "
      "WC  2.6.38.3+ #1 SAMSUNG ELECTRONICS CO., LTD. Alex/G100          \n"
      "<5>[56279.689748] EIP: 0060:[<8103e3ea>] EFLAGS: 00210286 CPU: 3\n"
      "<5>[56279.689758] EIP is at add_timer+0xd/0x1b\n"
      "<5>[56279.689762] EAX: f5e00684 EBX: f5e003c0 ECX: 00000002 EDX: "
      "00200246\n"
      "<5>[56279.689767] ESI: f5e003c0 EDI: d28bc03c EBP: d2be5e40 ESP: "
      "d2be5e40\n"
      "<5>[56279.689772]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068\n"
      "<0>[56279.689778] Process powerd_suspend (pid: 24607, ti=d2be4000 "
      "task=f5dc9b60 task.ti=d2be4000)\n"
      "<0>[56279.689782] Stack:\n"
      "<5>[56279.689785]  d2be5e4c f8dccced f4ac02c0 d2be5e70 f8ddc752 "
      "f5e003c0 f4ac0458 f4ac092c\n"
      "<5>[56279.689797]  f4ac043c f4ac02c0 f4ac0000 f4ac007c d2be5e7c "
      "f8dd4a33 f4ac0164 d2be5e94\n"
      "<5>[56279.689809]  f87e0304 f69ff0cc f4ac0164 f87e02a4 f4ac0164 "
      "d2be5eb0 81248968 00000000\n"
      "<0>[56279.689821] Call Trace:\n"
      "<5>[56279.689840]  [<f8dccced>] ieee80211_sta_restart+0x25/0x8c "
      "[mac80211]\n"
      "<5>[56279.689854]  [<f8ddc752>] ieee80211_reconfig+0x2e9/0x339 "
      "[mac80211]\n"
      "<5>[56279.689869]  [<f8dd4a33>] ieee80211_aes_cmac+0x182d/0x184e "
      "[mac80211]\n"
      "<5>[56279.689883]  [<f87e0304>] cfg80211_get_dev_from_info+0x29b/0x2c0 "
      "[cfg80211]\n"
      "<5>[56279.689895]  [<f87e02a4>] ? "
      "cfg80211_get_dev_from_info+0x23b/0x2c0 [cfg80211]\n"
      "<5>[56279.689904]  [<81248968>] legacy_resume+0x25/0x5d\n"
      "<5>[56279.689910]  [<812490ae>] device_resume+0xdd/0x110\n"
      "<5>[56279.689917]  [<812491c2>] dpm_resume_end+0xe1/0x271\n"
      "<5>[56279.689925]  [<81060481>] suspend_devices_and_enter+0x18b/0x1de\n"
      "<5>[56279.689932]  [<810605ba>] enter_state+0xe6/0x132\n"
      "<5>[56279.689939]  [<8105fd4b>] state_store+0x91/0x9d\n"
      "<5>[56279.689945]  [<8105fcba>] ? state_store+0x0/0x9d\n"
      "<5>[56279.689953]  [<81178fb1>] kobj_attr_store+0x16/0x22\n"
      "<5>[56279.689961]  [<810eea5e>] sysfs_write_file+0xc1/0xec\n"
      "<5>[56279.689969]  [<810af443>] vfs_write+0x8f/0x101\n"
      "<5>[56279.689975]  [<810ee99d>] ? sysfs_write_file+0x0/0xec\n"
      "<5>[56279.689982]  [<810af556>] sys_write+0x40/0x65\n"
      "<5>[56279.689989]  [<81002d57>] sysenter_do_call+0x12/0x26\n"
      "<0>[56279.689993] Code: c1 d3 e2 4a 89 55 f4 f7 d2 21 f2 6a 00 31 c9 89 "
      "d8 e8 6e fd ff ff 5a 8d 65 f8 5b 5e 5d c3 55 89 e5 3e 8d 74 26 00 83 38 "
      "00 74 04 <0f> 0b eb fe 8b 50 08 e8 6f ff ff ff 5d c3 55 89 e5 3e 8d 74 "
      "26 \n"
      "<0>[56279.690009] EIP: [<8103e3ea>] add_timer+0xd/0x1b SS:ESP "
      "0068:d2be5e40\n"
      "<4>[56279.690113] ---[ end trace b71141bb67c6032a ]---\n"
      "<7>[56279.694069] wlan0: deauthenticated from 00:00:00:00:00:01 "
      "(Reason: 6)\n"
      "<0>[56279.703465] Kernel panic - not syncing: Fatal exception\n"
      "<5>[56279.703471] Pid: 24607, comm: powerd_suspend Tainted: G      D "
      "WC  2.6.38.3+ #1\n"
      "<5>[56279.703475] Call Trace:\n"
      "<5>[56279.703483]  [<8136648c>] ? panic+0x55/0x152\n"
      "<5>[56279.703491]  [<810057fa>] ? oops_end+0x73/0x81\n"
      "<5>[56279.703497]  [<81005a44>] ? die+0xed/0xf5\n"
      "<5>[56279.703503]  [<810033cb>] ? do_trap+0x7a/0x80\n"
      "<5>[56279.703509]  [<8100369b>] ? do_invalid_op+0x0/0x80\n"
      "<5>[56279.703515]  [<81003711>] ? do_invalid_op+0x76/0x80\n"
      "<5>[56279.703522]  [<8103e3ea>] ? add_timer+0xd/0x1b\n"
      "<5>[56279.703529]  [<81025e23>] ? check_preempt_curr+0x2e/0x69\n"
      "<5>[56279.703536]  [<8102ef28>] ? ttwu_post_activation+0x5a/0x11b\n"
      "<5>[56279.703543]  [<8102fa8d>] ? try_to_wake_up+0x213/0x21d\n"
      "<5>[56279.703550]  [<81368b7f>] ? error_code+0x67/0x6c\n"
      "<5>[56279.703557]  [<8103e3ea>] ? add_timer+0xd/0x1b\n"
      "<5>[56279.703577]  [<f8dccced>] ? ieee80211_sta_restart+0x25/0x8c "
      "[mac80211]\n"
      "<5>[56279.703591]  [<f8ddc752>] ? ieee80211_reconfig+0x2e9/0x339 "
      "[mac80211]\n"
      "<5>[56279.703605]  [<f8dd4a33>] ? ieee80211_aes_cmac+0x182d/0x184e "
      "[mac80211]\n"
      "<5>[56279.703618]  [<f87e0304>] ? "
      "cfg80211_get_dev_from_info+0x29b/0x2c0 [cfg80211]\n"
      "<5>[56279.703630]  [<f87e02a4>] ? "
      "cfg80211_get_dev_from_info+0x23b/0x2c0 [cfg80211]\n"
      "<5>[56279.703637]  [<81248968>] ? legacy_resume+0x25/0x5d\n"
      "<5>[56279.703643]  [<812490ae>] ? device_resume+0xdd/0x110\n"
      "<5>[56279.703649]  [<812491c2>] ? dpm_resume_end+0xe1/0x271\n"
      "<5>[56279.703657]  [<81060481>] ? "
      "suspend_devices_and_enter+0x18b/0x1de\n"
      "<5>[56279.703663]  [<810605ba>] ? enter_state+0xe6/0x132\n"
      "<5>[56279.703670]  [<8105fd4b>] ? state_store+0x91/0x9d\n"
      "<5>[56279.703676]  [<8105fcba>] ? state_store+0x0/0x9d\n"
      "<5>[56279.703683]  [<81178fb1>] ? kobj_attr_store+0x16/0x22\n"
      "<5>[56279.703690]  [<810eea5e>] ? sysfs_write_file+0xc1/0xec\n"
      "<5>[56279.703697]  [<810af443>] ? vfs_write+0x8f/0x101\n"
      "<5>[56279.703703]  [<810ee99d>] ? sysfs_write_file+0x0/0xec\n"
      "<5>[56279.703709]  [<810af556>] ? sys_write+0x40/0x65\n"
      "<5>[56279.703716]  [<81002d57>] ? sysenter_do_call+0x12/0x26\n";
  // The first trace contains only uncertain entries and its hash is 00000000,
  // so, if we used that, the signature would be kernel-add_timer-00000000.
  // Instead we use the second-to-last trace for the hash.
  EXPECT_EQ("kernel-add_timer-B5178878",
            collector_.ComputeKernelStackSignature(kUncertainStackTrace));
}

TEST_F(KernelCollectorTest, ComputeKernelStackSignatureX86_64) {
  collector_.set_arch(KernelCollector::kArchX86_64);
  const char kStackTraceWithRIP[] =
      "<6>[ 1504.062071] tpm_tis tpm_tis: command 0x65 (size 18) returned code "
      "0x0\n"
      "<6>[ 1504.489032] tpm_tis tpm_tis: command 0x1e (size 274) returned "
      "code 0x0\n"
      "<1>[ 1505.850798] BUG: unable to handle kernel NULL pointer dereference "
      "at 0000000000000008\n"
      "<1>[ 1505.850823] IP: [<ffffffff94fb0c27>] list_del_init+0x8/0x1b\n"
      "<5>[ 1505.850843] PGD 0\n"
      "<5>[ 1505.850854] Oops: 0002 [#1] SMP\n"
      "<0>[ 1505.853049] gsmi: Log Shutdown Reason 0x03\n"
      "<5>[ 1505.853059] Modules linked in: ip6t_REJECT rfcomm i2c_dev uinput "
      "zram(C) memconsole zsmalloc(C) snd_hda_codec_realtek snd_hda_codec_hdmi "
      "snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc fuse "
      "nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables "
      "snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device "
      "snd_timer r8169 ath9k_btcoex ath9k_common_btcoex ath9k_hw_btcoex ath "
      "mac80211 cfg80211 ath3k btusb btrtl btbcm btintel bluetooth\n"
      "<5>[ 1505.853231] CPU 1\n"
      "<5>[ 1505.853240] Pid: 2663, comm: quipper Tainted: G WC 3.8.11 #1\n"
      "<5>[ 1505.853254] RIP: 0010:[<ffffffff94fb0c27>] [<ffffffff94fb0c27>] "
      "list_del_init+0x8/0x1b\n"
      "<5>[ 1505.853272] RSP: 0000:ffff880171789dd8 EFLAGS: 00010293\n"
      "<5>[ 1505.853282] RAX: ffff880171789de8 RBX: ffff8801715e6b40 RCX: "
      "000000000000003c\n"
      "<5>[ 1505.853294] RDX: 0000000000000000 RSI: 0000000000000004 RDI: "
      "ffff8801715e6b40\n"
      "<5>[ 1505.853305] RBP: ffff880171789e20 R08: ffffffff956b7ba8 R09: "
      "0000000000000000\n"
      "<5>[ 1505.853317] R10: 0000000000000004 R11: 000000000000000f R12: "
      "ffff880171789de8\n"
      "<5>[ 1505.853329] R13: ffff8801715e6c80 R14: ffff880177c040d8 R15: "
      "ffff880171789f00\n"
      "<5>[ 1505.853341] FS: 00007fd0e720f740(0000) GS:ffff88017cb00000(0000) "
      "knlGS:0000000000000000\n"
      "<5>[ 1505.853353] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n"
      "<5>[ 1505.853364] CR2: 0000000000000008 CR3: 000000016087c000 CR4: "
      "00000000000607e0\n"
      "<5>[ 1505.853375] DR0: 0000000000000000 DR1: 0000000000000000 DR2: "
      "0000000000000000\n"
      "<5>[ 1505.853386] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: "
      "0000000000000400\n"
      "<5>[ 1505.853398] Process quipper (pid: 2663, threadinfo "
      "ffff880171788000, task ffff880174dda580)\n"
      "<5>[ 1505.853409] Stack:\n"
      "<5>[ 1505.853416] ffff880171789e20 ffffffff94fb13c8 ffff8801715e6b40 "
      "ffff8801715e6c80\n"
      "<5>[ 1505.853440] 00000000fc9daf41 ffff880171789e30 ffff880175cfac60 "
      "ffff880171789e30\n"
      "<5>[ 1505.853463] ffff880174dda838 ffff880171789e60 ffffffff94fb36ea "
      "ffff880176bb3dc0\n"
      "<5>[ 1505.853487] Call Trace:\n"
      "<5>[ 1505.853498] [<ffffffff94fb13c8>] ? namespace_unlock+0x98/0x10e\n"
      "<5>[ 1505.853510] [<ffffffff94fb36ea>] put_mnt_ns+0x19d/0x1c4\n"
      "<5>[ 1505.853523] [<ffffffff94f0fb50>] free_nsproxy+0x1d/0x75\n"
      "<5>[ 1505.853535] [<ffffffff94f0fd5c>] "
      "switch_task_namespaces+0x47/0x4e\n"
      "<5>[ 1505.853547] [<ffffffff94f0fd73>] exit_task_namespaces+0x10/0x12\n"
      "<5>[ 1505.853561] [<ffffffff94ef54ea>] do_exit+0x74b/0x8f7\n"
      "<5>[ 1505.853573] [<ffffffff94e84a98>] ? "
      "__percpu_counter_add+0x46/0x51\n"
      "<5>[ 1505.853587] [<ffffffff94f8a0de>] ? do_munmap+0x353/0x364\n"
      "<5>[ 1505.853599] [<ffffffff94ef57fb>] do_group_exit+0x42/0xb0\n"
      "<5>[ 1505.853611] [<ffffffff94ef587d>] sys_exit_group+0x14/0x14\n"
      "<5>[ 1505.853623] [<ffffffff95353928>] system_call_fastpath+0x16/0x1b\n"
      "<5>[ 1505.853633] Code: f1 be 00 00 40 00 48 89 e5 e8 fc fe ff ff 48 3d "
      "00 f0 ff ff 77 0b 48 c7 80 b0 00 00 00 ea ff ff ff 5d c3 48 8b 17 48 8b "
      "47 08 55 <48> 89 42 08 48 89 e5 48 89 10 48 89 3f 48 89 7f 08 5d c3 0f "
      "1f\n"
      "<1>[ 1505.853861] RIP [<ffffffff94fb0c27>] list_del_init+0x8/0x1b\n"
      "<5>[ 1505.853877] RSP <ffff880171789dd8>\n"
      "<5>[ 1505.853885] CR2: 0000000000000008\n"
      "<4>[ 1505.853914] ---[ end trace 6559e9c0a9497905 ]---\n"
      "<0>[ 1505.861341] Kernel panic - not syncing: Fatal exception\n"
      "<0>[ 1505.861358] Kernel Offset: 0x13e00000 from 0xffffffff81000000 "
      "(relocation range: 0xffffffff80000000-0xffffffffbfffffff)\n"
      "<0>[ 1505.861462] gsmi: Log Shutdown Reason 0x02\n"
      "";

  EXPECT_EQ("kernel-list_del_init-590B9789",
            collector_.ComputeKernelStackSignature(kStackTraceWithRIP));
}

TEST_F(KernelCollectorTest, ComputeKernelStackSignatureCommonAllArches) {
  ComputeKernelStackSignatureCommon(KernelCollector::kArchArm);
  ComputeKernelStackSignatureCommon(KernelCollector::kArchMips);
  ComputeKernelStackSignatureCommon(KernelCollector::kArchX86);
  ComputeKernelStackSignatureCommon(KernelCollector::kArchX86_64);
}