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Merge changes I9067b933,I64fac7e1 am: fe9b71d734 am: 8f1a4f806c

Browse source 
am: ff10b601c6

Change-Id: I227a9c77f85257dbe3082b0173f7b412efb0c68a
This commit is contained in:
Mark Salyzyn 2018-11-02 16:00:55 -07:00 committed by android-build-merger
commit c672cd627b
1 changed files with 20 additions and 6 deletions
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26
llkd/libllkd.cpp
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@ -510,8 +510,10 @@ bool llkWriteStringToFileConfirm(const std::string& string, const std::string& f
return android::base::Trim(content) == string;
}
void llkPanicKernel(bool dump, pid_t tid, const char* state) __noreturn;
void llkPanicKernel(bool dump, pid_t tid, const char* state) {
void llkPanicKernel(bool dump, pid_t tid, const char* state,
const std::string& message = "") __noreturn;
void llkPanicKernel(bool dump, pid_t tid, const char* state, const std::string& message) {
if (!message.empty()) LOG(ERROR) << message;
auto sysrqTriggerFd = llkFileToWriteFd("/proc/sysrq-trigger");
if (sysrqTriggerFd < 0) {
// DYB
@ -524,14 +526,24 @@ void llkPanicKernel(bool dump, pid_t tid, const char* state) {
if (dump) {
// Show all locks that are held
android::base::WriteStringToFd("d", sysrqTriggerFd);
// Show all waiting tasks
android::base::WriteStringToFd("w", sysrqTriggerFd);
// This can trigger hardware watchdog, that is somewhat _ok_.
// But useless if pstore configured for <256KB, low ram devices ...
if (llkEnableSysrqT) {
android::base::WriteStringToFd("t", sysrqTriggerFd);
// Show all locks that are held (in case 't' overflows ramoops)
android::base::WriteStringToFd("d", sysrqTriggerFd);
// Show all waiting tasks (in case 't' overflows ramoops)
android::base::WriteStringToFd("w", sysrqTriggerFd);
}
::usleep(200000); // let everything settle
}
llkWriteStringToFile("SysRq : Trigger a crash : 'livelock,"s + state + "'\n", "/dev/kmsg");
// SysRq message matches kernel format, and propagates through bootstat
// ultimately to the boot reason into panic,livelock,<state>.
llkWriteStringToFile(message + (message.empty() ? "" : "\n") +
"SysRq : Trigger a crash : 'livelock,"s + state + "'\n",
"/dev/kmsg");
android::base::WriteStringToFd("c", sysrqTriggerFd);
// NOTREACHED
// DYB
@ -1092,10 +1104,12 @@ milliseconds llkCheck(bool checkRunning) {
}
}
// We are here because we have confirmed kernel live-lock
LOG(ERROR) << state << ' ' << llkFormat(procp->count) << ' ' << ppid << "->" << pid
<< "->" << tid << ' ' << procp->getComm() << " [panic]";
const auto message = state + " "s + llkFormat(procp->count) + " " +
std::to_string(ppid) + "->" + std::to_string(pid) + "->" +
std::to_string(tid) + " " + procp->getComm() + " [panic]";
llkPanicKernel(true, tid,
(state == 'Z') ? "zombie" : (state == 'D') ? "driver" : "sleeping");
(state == 'Z') ? "zombie" : (state == 'D') ? "driver" : "sleeping",
message);
}
LOG(VERBOSE) << "+closedir()";
}