Merge pull request #1540 from pguyot/w07/print-oom-memory-info

Add memory info to OOM crash logs

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

Author: bettio

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added the ability to run beams from the CLI for Generic Unix platform (it was already possible
 with nodejs and emscripten)
 - Added preliminary support for ESP32P4 (no networking support yet).
+- Added memory info in `out_of_memory` crash logs to help developers fix memory issues.
 
 ### Fixed
 

src/libAtomVM/opcodesswitch.h

@@ -1352,6 +1352,8 @@ COLD_FUNC static void cp_to_mod_lbl_off(term cp, Context *ctx, Module **cp_mod,
 
 COLD_FUNC static void dump(Context *ctx)
 {
+    GlobalContext *glb = ctx->global;
+
     fprintf(stderr, "CRASH \n======\n");
 
     fprintf(stderr, "pid: ");
@@ -1377,7 +1379,7 @@ COLD_FUNC static void dump(Context *ctx)
     term_display(stderr, ctx->x[1], ctx);
     fprintf(stderr, "\nx[2]: ");
     term_display(stderr, ctx->x[2], ctx);
-    fprintf(stderr, "\n\nStack \n------\n\n");
+    fprintf(stderr, "\n\nStack \n-----\n\n");
 
     term *ct = ctx->e;
 
@@ -1402,12 +1404,12 @@ COLD_FUNC static void dump(Context *ctx)
         ct++;
     }
 
-    fprintf(stderr, "\n\nMailbox\n--------\n");
+    fprintf(stderr, "\n\nMailbox\n-------\n");
     mailbox_crashdump(ctx);
 
     fprintf(stderr, "\n\nMonitors\n--------\n");
     // Lock processes table to make sure any dying process will not modify monitors
-    struct ListHead *processes_table = synclist_rdlock(&ctx->global->processes_table);
+    struct ListHead *processes_table = synclist_rdlock(&glb->processes_table);
     UNUSED(processes_table);
     struct ListHead *item;
     LIST_FOR_EACH (item, &ctx->monitors_head) {
@@ -1425,7 +1427,36 @@ COLD_FUNC static void dump(Context *ctx)
         term_display(stderr, term_from_local_process_id(ctx->process_id), ctx);
         fprintf(stderr, "\n");
     }
-    synclist_unlock(&ctx->global->processes_table);
+    synclist_unlock(&glb->processes_table);
+
+    // If crash is caused by out_of_memory, print more data about memory usage
+    if (ctx->x[0] == ERROR_ATOM && ctx->x[1] == OUT_OF_MEMORY_ATOM) {
+        fprintf(stderr, "\n\nContext memory info\n-------------------\n");
+        fprintf(stderr, "context_size = %zu\n", context_size(ctx));
+        fprintf(stderr, "context_avail_free_memory = %zu\n", context_avail_free_memory(ctx));
+        fprintf(stderr, "heap_size = %zu\n", memory_heap_youngest_size(&ctx->heap));
+        fprintf(stderr, "total_heap_size = %zu\n", memory_heap_memory_size(&ctx->heap));
+        fprintf(stderr, "stack_size = %zu\n", context_stack_size(ctx));
+        fprintf(stderr, "message_queue_len = %zu\n", context_message_queue_len(ctx));
+        fprintf(stderr, "\n\nGlobal memory info\n------------------\n");
+
+        processes_table = synclist_rdlock(&glb->processes_table);
+        size_t process_count = 0;
+        size_t ports_count = 0;
+        LIST_FOR_EACH (item, processes_table) {
+            Context *p = GET_LIST_ENTRY(item, Context, processes_table_head);
+            process_count++;
+            if (p->native_handler) {
+                ports_count++;
+            }
+        }
+        synclist_unlock(&glb->processes_table);
+
+        fprintf(stderr, "process_count = %zu\n", process_count);
+        fprintf(stderr, "ports_count = %zu\n", ports_count);
+        fprintf(stderr, "atoms_count = %d\n", atom_table_count(glb->atom_table));
+        fprintf(stderr, "refc_binary_total_size = %zu\n", refc_binary_total_size(ctx));
+    }
     fprintf(stderr, "\n\n**End Of Crash Report**\n");
 }