chat: локальное удаление канала (Android) + db_sync инстансы в куче

tools/chatgui-android/libutun_lite/instance_lite.c

@@ -7,6 +7,7 @@
  *
  * Mirrors UtunNode::runLoop() from tools/chatgui/transport/utun_node.cpp:221-372.
  */
+#define _GNU_SOURCE 1   /* dladdr (Linux); no-op on Android/bionic */
 #include "instance_lite.h"
 #include "utun_instance.h"
 #include "config_parser.h"
@@ -34,6 +35,8 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <signal.h>
+#include <unwind.h>
+#include <dlfcn.h>
 #include <time.h>
 #include <errno.h>
 #include <openssl/evp.h>
@@ -203,10 +206,36 @@ static void on_link_status_changed(struct ETCP_CONN* conn, struct ETCP_LINK* lin
 static volatile int g_signal_caught = 0;
 static volatile int g_signal_num = 0;
 
+struct crash_bt_state { void** frames; int count; int max; };
+
+static _Unwind_Reason_Code crash_bt_cb(struct _Unwind_Context* ctx, void* arg) {
+    struct crash_bt_state* st = (struct crash_bt_state*)arg;
+    if (st->count < st->max) {
+        void* pc = (void*)_Unwind_GetIP(ctx);
+        if (pc) st->frames[st->count++] = pc;
+        return _URC_NO_REASON;
+    }
+    return _URC_END_OF_STACK;
+}
+
 static void crash_signal_handler(int sig, siginfo_t* info, void* ctx) {
     (void)ctx;
     g_signal_caught = 1; g_signal_num = sig;
     DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "CRASH signal=%d code=%d addr=%p thread still alive", sig, info->si_code, info->si_addr);
+    void* frames[64];
+    struct crash_bt_state st = { frames, 0, 64 };
+    _Unwind_Backtrace(crash_bt_cb, &st);
+    IL_LOGE("CRASH backtrace %d frames:", st.count);
+    for (int i = 0; i < st.count; i++) {
+        Dl_info dli;
+        if (dladdr(frames[i], &dli) && dli.dli_sname) {
+            IL_LOGE("  #%02d %p %s+%p (%s)", i, frames[i], dli.dli_sname,
+                    (void*)((char*)frames[i] - (char*)dli.dli_saddr),
+                    dli.dli_fname ? dli.dli_fname : "?");
+        } else {
+            IL_LOGE("  #%02d %p (no symbol)", i, frames[i]);
+        }
+    }
     signal(sig, SIG_DFL);
     raise(sig);
 }