am c69b6b70: Merge "Add log summary to tombstones" (5e63c830) · Commits · e / os / android_system_core

debuggerd/arm/machine.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -56,6 +56,8 @@ extern int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map,
		/*
		* If this isn't clearly a null pointer dereference, dump the
		* /proc/maps entries near the fault address.
		*
		* This only makes sense to do on the thread that crashed.
		*/
		static void show_nearby_maps(int tfd, int pid, mapinfo *map)
		{
		@@ -63,7 +65,8 @@ static void show_nearby_maps(int tfd, int pid, mapinfo *map)

		memset(&si, 0, sizeof(si));
		if (ptrace(PTRACE_GETSIGINFO, pid, 0, &si)) {
		_LOG(tfd, false, "cannot get siginfo: %s\n", strerror(errno));
		_LOG(tfd, false, "cannot get siginfo for %d: %s\n",
		pid, strerror(errno));
		return;
		}
		if (!signal_has_address(si.si_signo))
		@@ -237,7 +240,9 @@ void dump_stack_and_code(int tfd, int pid, mapinfo *map,
		}
		}

		if (at_fault) {
		show_nearby_maps(tfd, pid, map);
		}

		unsigned int p, end;
		unsigned int sp = r.ARM_sp;

debuggerd/debuggerd.c

+96 −24

Original line number	Diff line number	Diff line
		@@ -43,6 +43,9 @@

		#define ANDROID_LOG_INFO 4

		void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...)
		__attribute__ ((format(printf, 3, 4)));

		/* Log information onto the tombstone */
		void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...)
		{
		@@ -60,6 +63,7 @@ void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...)

		if (!in_tombstone_only)
		__android_log_vprint(ANDROID_LOG_INFO, "DEBUG", fmt, ap);
		va_end(ap);
		}

		// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so
		@@ -177,7 +181,7 @@ void dump_fault_addr(int tfd, int pid, int sig)
		_LOG(tfd, false, "signal %d (%s), code %d (%s), fault addr %08x\n",
		sig, get_signame(sig),
		si.si_code, get_sigcode(sig, si.si_code),
		si.si_addr);
		(uintptr_t) si.si_addr);
		} else {
		_LOG(tfd, false, "signal %d (%s), code %d (%s), fault addr --------\n",
		sig, get_signame(sig), si.si_code, get_sigcode(sig, si.si_code));
		@@ -408,24 +412,40 @@ static bool dump_sibling_thread_report(int tfd, unsigned pid, unsigned tid)
		continue;

		dump_crash_report(tfd, pid, new_tid, false);
		need_cleanup \|= ptrace(PTRACE_DETACH, new_tid, 0, 0);

		if (ptrace(PTRACE_DETACH, new_tid, 0, 0) != 0) {
		XLOG("detach of tid %d failed: %s\n", new_tid, strerror(errno));
		need_cleanup = 1;
		}
		}
		closedir(d);

		return need_cleanup != 0;
		}

		/*
		* Reads the contents of the specified log device, filters out the entries
		* that don't match the specified pid, and writes them to the tombstone file.
		*
		* If "tailOnly" is set, we only print the last few lines.
		*/
		static void dump_log_file(int tfd, unsigned pid, const char* filename)
		static void dump_log_file(int tfd, unsigned pid, const char* filename,
		bool tailOnly)
		{
		bool first = true;

		/* circular buffer, for "tailOnly" mode */
		const int kShortLogMaxLines = 5;
		const int kShortLogLineLen = 256;
		char shortLog[kShortLogMaxLines][kShortLogLineLen];
		int shortLogCount = 0;
		int shortLogNext = 0;

		int logfd = open(filename, O_RDONLY \| O_NONBLOCK);
		if (logfd < 0) {
		XLOG("Unable to open %s: %s\n", filename, strerror(errno));
		return;
		}
		_LOG(tfd, true, "--------- log %s\n", filename);

		union {
		unsigned char buf[LOGGER_ENTRY_MAX_LEN + 1];
		@@ -466,6 +486,12 @@ static void dump_log_file(int tfd, unsigned pid, const char* filename)
		continue;
		}

		if (first) {
		_LOG(tfd, true, "--------- %slog %s\n",
		tailOnly ? "tail end of " : "", filename);
		first = false;
		}

		/*
		* Msg format is: <priority:1><tag:N>\0<message:N>\0
		*
		@@ -477,10 +503,16 @@ static void dump_log_file(int tfd, unsigned pid, const char* filename)
		*/
		static const char* kPrioChars = "!.VDIWEFS";
		unsigned char prio = entry->msg[0];
		const char* tag = entry->msg + 1;
		const char* msg = tag + strlen(tag) + 1;
		char* tag = entry->msg + 1;
		char* msg = tag + strlen(tag) + 1;

		/* consume any trailing newlines */
		char* eatnl = msg + strlen(msg) - 1;
		while (eatnl >= msg && *eatnl == '\n') {
		*eatnl-- = '\0';
		}

		log_entry.entry.msg[entry->len] = '\0';
		char prioChar = (prio < strlen(kPrioChars) ? kPrioChars[prio] : '?');

		char timeBuf[32];
		time_t sec = (time_t) entry->sec;
		@@ -489,11 +521,37 @@ static void dump_log_file(int tfd, unsigned pid, const char* filename)
		ptm = localtime_r(&sec, &tmBuf);
		strftime(timeBuf, sizeof(timeBuf), "%m-%d %H:%M:%S", ptm);

		_LOG(tfd, true, "%s.%03ld %5d %5d %c %-8s: %s\n",
		timeBuf, entry->nsec / 1000000,
		entry->pid, entry->tid,
		(prio < strlen(kPrioChars) ? kPrioChars[prio] : '?'),
		tag, msg);
		if (tailOnly) {
		snprintf(shortLog[shortLogNext], kShortLogLineLen,
		"%s.%03d %5d %5d %c %-8s: %s",
		timeBuf, entry->nsec / 1000000, entry->pid, entry->tid,
		prioChar, tag, msg);
		shortLogNext = (shortLogNext + 1) % kShortLogMaxLines;
		shortLogCount++;
		} else {
		_LOG(tfd, true, "%s.%03d %5d %5d %c %-8s: %s\n",
		timeBuf, entry->nsec / 1000000, entry->pid, entry->tid,
		prioChar, tag, msg);
		}
		}

		if (tailOnly) {
		int i;

		/*
		* If we filled the buffer, we want to start at "next", which has
		* the oldest entry. If we didn't, we want to start at zero.
		*/
		if (shortLogCount < kShortLogMaxLines) {
		shortLogNext = 0;
		} else {
		shortLogCount = kShortLogMaxLines; /* cap at window size */
		}

		for (i = 0; i < shortLogCount; i++) {
		_LOG(tfd, true, "%s\n", shortLog[shortLogNext]);
		shortLogNext = (shortLogNext + 1) % kShortLogMaxLines;
		}
		}

		close(logfd);
		@@ -503,10 +561,10 @@ static void dump_log_file(int tfd, unsigned pid, const char* filename)
		* Dumps the logs generated by the specified pid to the tombstone, from both
		* "system" and "main" log devices. Ideally we'd interleave the output.
		*/
		static void dump_logs(int tfd, unsigned pid)
		static void dump_logs(int tfd, unsigned pid, bool tailOnly)
		{
		dump_log_file(tfd, pid, "/dev/log/system");
		dump_log_file(tfd, pid, "/dev/log/main");
		dump_log_file(tfd, pid, "/dev/log/system", tailOnly);
		dump_log_file(tfd, pid, "/dev/log/main", tailOnly);
		}

		/* Return true if some thread is not detached cleanly */
		@@ -516,6 +574,11 @@ static bool engrave_tombstone(unsigned pid, unsigned tid, int debug_uid,
		int fd;
		bool need_cleanup = false;

		/* don't copy log messages to tombstone unless this is a dev device */
		char value[PROPERTY_VALUE_MAX];
		property_get("ro.debuggable", value, "0");
		bool wantLogs = (value[0] == '1');

		mkdir(TOMBSTONE_DIR, 0755);
		chown(TOMBSTONE_DIR, AID_SYSTEM, AID_SYSTEM);

		@@ -525,6 +588,11 @@ static bool engrave_tombstone(unsigned pid, unsigned tid, int debug_uid,

		dump_crash_banner(fd, pid, tid, signal);
		dump_crash_report(fd, pid, tid, true);

		if (wantLogs) {
		dump_logs(fd, pid, true);
		}

		/*
		* If the user has requested to attach gdb, don't collect the per-thread
		* information as it increases the chance to lose track of the process.
		@@ -533,11 +601,8 @@ static bool engrave_tombstone(unsigned pid, unsigned tid, int debug_uid,
		need_cleanup = dump_sibling_thread_report(fd, pid, tid);
		}

		/* don't copy log to tombstone unless this is a dev device */
		char value[PROPERTY_VALUE_MAX];
		property_get("ro.debuggable", value, "0");
		if (value[0] == '1') {
		dump_logs(fd, pid);
		if (wantLogs) {
		dump_logs(fd, pid, false);
		}

		close(fd);
		@@ -703,9 +768,11 @@ static void handle_crashing_process(int fd)
		* is blocked in a read() call. This gives us the time to PTRACE_ATTACH
		* to it before it has a chance to really fault.
		*
		* After the attach, the thread is stopped, and we write to the file
		* descriptor to ensure that it will run as soon as we call PTRACE_CONT
		* below. See details in bionic/libc/linker/debugger.c, in function
		* The PTRACE_ATTACH sends a SIGSTOP to the target process, but it
		* won't necessarily have stopped by the time ptrace() returns. (We
		* currently assume it does.) We write to the file descriptor to
		* ensure that it can run as soon as we call PTRACE_CONT below.
		* See details in bionic/libc/linker/debugger.c, in function
		* debugger_signal_handler().
		*/
		tid_attach_status = ptrace(PTRACE_ATTACH, tid, 0, 0);
		@@ -813,7 +880,12 @@ done:
		wait_for_user_action(tid, &cr);
		}

		/* resume stopped process (so it can crash in peace) */
		/*
		* Resume stopped process (so it can crash in peace). If we didn't
		* successfully detach, we're still the parent, and the actual parent
		* won't receive a death notification via wait(2). At this point
		* there's not much we can do about that.
		*/
		kill(cr.pid, SIGCONT);

		if (need_cleanup) {