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https://github.com/hyprwm/Hyprland.git
synced 2025-08-09 08:31:54 -07:00
CrashReporter: fix deadlocks by making it mostly async-signal-safe (#5771)
`CrashReporter::createAndSaveCrash()` is not async-signal-safe, resulting in random deadlocks/double-crashes during Hyprland crashes. This changes the function to be (mostly) async-signal-safe.
This commit is contained in:
virchau13
GitHub
@@ -1,59 +1,127 @@
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#include "CrashReporter.hpp"
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#include <random>
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#include <fcntl.h>
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#include <sys/utsname.h>
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#include <fstream>
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#include <signal.h>
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#include <link.h>
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#include <time.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include "../plugins/PluginSystem.hpp"
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#include "../signal-safe.hpp"
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#if defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__)
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#include <sys/sysctl.h>
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#endif
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std::string getRandomMessage() {
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static char const* const MESSAGES[] = {"Sorry, didn't mean to...",
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"This was an accident, I swear!",
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"Calm down, it was a misinput! MISINPUT!",
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"Oops",
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"Vaxry is going to be upset.",
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"Who tried dividing by zero?!",
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"Maybe you should try dusting your PC in the meantime?",
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"I tried so hard, and got so far...",
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"I don't feel so good...",
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"*thud*",
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"Well this is awkward.",
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"\"stable\"",
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"I hope you didn't have any unsaved progress.",
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"All these computers..."};
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const std::vector<std::string> MESSAGES = {"Sorry, didn't mean to...",
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"This was an accident, I swear!",
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"Calm down, it was a misinput! MISINPUT!",
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"Oops",
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"Vaxry is going to be upset.",
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"Who tried dividing by zero?!",
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"Maybe you should try dusting your PC in the meantime?",
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"I tried so hard, and got so far...",
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"I don't feel so good...",
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"*thud*",
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"Well this is awkward.",
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"\"stable\"",
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"I hope you didn't have any unsaved progress.",
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"All these computers..."};
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// <random> is not async-signal-safe, fake it with time(NULL) instead
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char const* getRandomMessage() {
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return MESSAGES[time(NULL) % (sizeof(MESSAGES) / sizeof(MESSAGES[0]))];
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}
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std::random_device dev;
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std::mt19937 engine(dev());
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std::uniform_int_distribution<> distribution(0, MESSAGES.size() - 1);
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return MESSAGES[distribution(engine)];
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[[noreturn]] inline void exit_with_error(char const* err) {
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write(STDERR_FILENO, err, strlen(err));
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// perror() is not signal-safe, but we use it here
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// because if the crash-handler already crashed, it can't get any worse.
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perror("");
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abort();
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}
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void CrashReporter::createAndSaveCrash(int sig) {
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int reportFd;
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// get the backtrace
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const int PID = getpid();
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// We're in the signal handler, so we *only* have stack memory.
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// To save as much stack memory as possible,
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// destroy things as soon as possible.
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{
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MaxLengthCString<255> reportPath;
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std::string finalCrashReport = "";
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const auto HOME = sig_getenv("HOME");
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const auto CACHE_HOME = sig_getenv("XDG_CACHE_HOME");
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if (CACHE_HOME && CACHE_HOME[0] != '\0') {
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reportPath += CACHE_HOME;
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reportPath += "/hyprland";
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} else if (HOME && HOME[0] != '\0') {
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reportPath += HOME;
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reportPath += "/.cache/hyprland";
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} else {
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exit_with_error("$CACHE_HOME and $HOME not set, nowhere to report crash\n");
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return;
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}
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int ret = mkdir(reportPath.get_str(), S_IRWXU);
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//__asm__("int $3");
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if (ret < 0 && errno != EEXIST) {
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exit_with_error("failed to mkdir() crash report directory\n");
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}
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reportPath += "/hyprlandCrashReport";
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reportPath.write_num(getpid());
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reportPath += ".txt";
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{
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BufFileWriter<64> stderr(2);
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stderr += "Hyprland has crashed :( Consult the crash report at ";
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if (!reportPath.boundsExceeded()) {
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stderr += reportPath.get_str();
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} else {
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stderr += "[ERROR: Crash report path does not fit into memory! Check if your $CACHE_HOME/$HOME is too deeply nested. Max 255 characters.]";
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}
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stderr += " for more information.\n";
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stderr.flush();
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}
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reportFd = open(reportPath.get_str(), O_WRONLY | O_CREAT, S_IRWXU);
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if (reportFd < 0) {
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exit_with_error("Failed to open crash report path for writing");
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}
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}
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BufFileWriter<512> finalCrashReport(reportFd);
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finalCrashReport += "--------------------------------------------\n Hyprland Crash Report\n--------------------------------------------\n";
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finalCrashReport += getRandomMessage() + "\n\n";
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finalCrashReport += getRandomMessage();
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finalCrashReport += "\n\n";
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finalCrashReport += std::format("Hyprland received signal {} ({})\n\n", sig, (const char*)strsignal(sig));
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finalCrashReport += "Hyprland received signal ";
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finalCrashReport.writeNum(sig);
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finalCrashReport += '(';
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finalCrashReport += sig_strsignal(sig);
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finalCrashReport += ")\nVersion: ";
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finalCrashReport += GIT_COMMIT_HASH;
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finalCrashReport += "\nTag: ";
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finalCrashReport += GIT_TAG;
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finalCrashReport += "\n\n";
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finalCrashReport += std::format("Version: {}\nTag: {}\n\n", GIT_COMMIT_HASH, GIT_TAG);
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if (g_pPluginSystem && !g_pPluginSystem->getAllPlugins().empty()) {
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if (g_pPluginSystem && g_pPluginSystem->pluginCount() > 0) {
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finalCrashReport += "Hyprland seems to be running with plugins. This crash might not be Hyprland's fault.\nPlugins:\n";
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for (auto& p : g_pPluginSystem->getAllPlugins()) {
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finalCrashReport += std::format("\t{} ({}) {}\n", p->name, p->author, p->version);
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size_t count = g_pPluginSystem->pluginCount();
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CPlugin* plugins[count];
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g_pPluginSystem->sig_getPlugins(plugins, count);
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for (size_t i = 0; i < count; i++) {
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auto p = plugins[i];
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finalCrashReport += '\t';
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finalCrashReport += p->name;
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finalCrashReport += " (";
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finalCrashReport += p->author;
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finalCrashReport += ") ";
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finalCrashReport += p->version;
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finalCrashReport += '\n';
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}
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finalCrashReport += "\n\n";
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@@ -61,21 +129,36 @@ void CrashReporter::createAndSaveCrash(int sig) {
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finalCrashReport += "System info:\n";
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struct utsname unameInfo;
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uname(&unameInfo);
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{
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struct utsname unameInfo;
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uname(&unameInfo);
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finalCrashReport += std::format("\tSystem name: {}\n\tNode name: {}\n\tRelease: {}\n\tVersion: {}\n\n", std::string{unameInfo.sysname}, std::string{unameInfo.nodename},
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std::string{unameInfo.release}, std::string{unameInfo.version});
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finalCrashReport += "\tSystem name: ";
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finalCrashReport += unameInfo.sysname;
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finalCrashReport += "\n\tNode name: ";
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finalCrashReport += unameInfo.nodename;
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finalCrashReport += "\n\tRelease: ";
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finalCrashReport += unameInfo.release;
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finalCrashReport += "\n\tVersion: ";
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finalCrashReport += unameInfo.version;
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finalCrashReport += "\n\n";
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}
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finalCrashReport += "GPU:\n\t";
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#if defined(__DragonFly__) || defined(__FreeBSD__)
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const std::string GPUINFO = execAndGet("pciconf -lv | fgrep -A4 vga");
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finalCrashReport.writeCmdOutput("pciconf -lv | fgrep -A4 vga");
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#else
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const std::string GPUINFO = execAndGet("lspci -vnn | grep VGA");
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finalCrashReport.writeCmdOutput("lspci -vnn | grep VGA");
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#endif
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finalCrashReport += "GPU:\n\t" + GPUINFO;
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finalCrashReport += "\n\nos-release:\n";
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finalCrashReport.writeCmdOutput("cat /etc/os-release | sed 's/^/\t/'");
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finalCrashReport += std::format("\n\nos-release:\n\t{}\n\n\n", replaceInString(execAndGet("cat /etc/os-release"), "\n", "\n\t"));
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// dladdr1()/backtrace_symbols()/this entire section allocates, and hence is NOT async-signal-safe.
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// Make sure that we save the current known crash report information,
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// so that if we are caught in a deadlock during a call to malloc(),
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// there is still something to debug from.
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finalCrashReport.flush();
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finalCrashReport += "Backtrace:\n";
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@@ -132,7 +215,10 @@ void CrashReporter::createAndSaveCrash(int sig) {
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std::stringstream ssin(ADDR2LINE);
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for (size_t i = 0; i < CALLSTACK.size(); ++i) {
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finalCrashReport += std::format("\t#{} | {}", i, CALLSTACK[i].desc);
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finalCrashReport += "\t#";
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finalCrashReport.writeNum(i);
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finalCrashReport += " | ";
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finalCrashReport += CALLSTACK[i].desc;
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std::string functionInfo;
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std::string fileLineInfo;
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std::getline(ssin, functionInfo);
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@@ -142,32 +228,5 @@ void CrashReporter::createAndSaveCrash(int sig) {
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finalCrashReport += "\n\nLog tail:\n";
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finalCrashReport += Debug::rollingLog.substr(Debug::rollingLog.find("\n") + 1);
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const auto HOME = getenv("HOME");
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const auto CACHE_HOME = getenv("XDG_CACHE_HOME");
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if (!HOME)
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return;
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std::ofstream ofs;
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std::string reportDir;
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if (!CACHE_HOME || std::string(CACHE_HOME).empty())
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reportDir = std::string(HOME) + "/.cache/hyprland";
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else
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reportDir = std::string(CACHE_HOME) + "/hyprland";
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if (!std::filesystem::exists(reportDir))
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std::filesystem::create_directory(reportDir);
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const auto path = reportDir + "/hyprlandCrashReport" + std::to_string(PID) + ".txt";
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ofs.open(path, std::ios::trunc);
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ofs << finalCrashReport;
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ofs.close();
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Debug::disableStdout = false;
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Debug::log(CRIT, "Hyprland has crashed :( Consult the crash report at {} for more information.", path);
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finalCrashReport += std::string_view(Debug::rollingLog).substr(Debug::rollingLog.find("\n") + 1);
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}
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