zygote: use async signal safe log to record child process death
Bug: https://issuetracker.google.com/issues/119713191
Test: open/close apps, observe the child process death log
Test: run monkey
Change-Id: Ia121f44c00f715367446dfe97de6df1f7fa6bdfe
Signed-off-by: wangmingming1 <wangmingming1@xiaomi.com>
diff --git a/core/jni/com_android_internal_os_Zygote.cpp b/core/jni/com_android_internal_os_Zygote.cpp
index 3012c90..abf294b 100644
--- a/core/jni/com_android_internal_os_Zygote.cpp
+++ b/core/jni/com_android_internal_os_Zygote.cpp
@@ -25,6 +25,8 @@
#define LOG_TAG "Zygote"
+#include <async_safe/log.h>
+
// sys/mount.h has to come before linux/fs.h due to redefinition of MS_RDONLY, MS_BIND, etc
#include <sys/mount.h>
#include <linux/fs.h>
@@ -296,27 +298,23 @@
int saved_errno = errno;
while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
- // Log process-death status that we care about. In general it is
- // not safe to call LOG(...) from a signal handler because of
- // possible reentrancy. However, we know a priori that the
- // current implementation of LOG() is safe to call from a SIGCHLD
- // handler in the zygote process. If the LOG() implementation
- // changes its locking strategy or its use of syscalls within the
- // lazy-init critical section, its use here may become unsafe.
+ // Log process-death status that we care about.
if (WIFEXITED(status)) {
- ALOGI("Process %d exited cleanly (%d)", pid, WEXITSTATUS(status));
+ async_safe_format_log(ANDROID_LOG_INFO, LOG_TAG,
+ "Process %d exited cleanly (%d)", pid, WEXITSTATUS(status));
} else if (WIFSIGNALED(status)) {
- ALOGI("Process %d exited due to signal (%d)", pid, WTERMSIG(status));
- if (WCOREDUMP(status)) {
- ALOGI("Process %d dumped core.", pid);
- }
+ async_safe_format_log(ANDROID_LOG_INFO, LOG_TAG,
+ "Process %d exited due to signal %d (%s)%s", pid,
+ WTERMSIG(status), strsignal(WTERMSIG(status)),
+ WCOREDUMP(status) ? "; core dumped" : "");
}
// If the just-crashed process is the system_server, bring down zygote
// so that it is restarted by init and system server will be restarted
// from there.
if (pid == gSystemServerPid) {
- ALOGE("Exit zygote because system server (%d) has terminated", pid);
+ async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG,
+ "Exit zygote because system server (pid %d) has terminated", pid);
kill(getpid(), SIGKILL);
}
@@ -329,14 +327,17 @@
// Note that we shouldn't consider ECHILD an error because
// the secondary zygote might have no children left to wait for.
if (pid < 0 && errno != ECHILD) {
- ALOGW("Zygote SIGCHLD error in waitpid: %s", strerror(errno));
+ async_safe_format_log(ANDROID_LOG_WARN, LOG_TAG,
+ "Zygote SIGCHLD error in waitpid: %s", strerror(errno));
}
if (blastulas_removed > 0) {
if (write(gBlastulaPoolEventFD, &blastulas_removed, sizeof(blastulas_removed)) == -1) {
// If this write fails something went terribly wrong. We will now kill
// the zygote and let the system bring it back up.
- ALOGE("Zygote failed to write to blastula pool event FD: %s", strerror(errno));
+ async_safe_format_log(ANDROID_LOG_ERROR, LOG_TAG,
+ "Zygote failed to write to blastula pool event FD: %s",
+ strerror(errno));
kill(getpid(), SIGKILL);
}
}