{"action":"created","comment":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/25128438","id":25128438,"diff_hunk":"@@ -719,12 +723,16 @@ DLLEXPORT jl_value_t *jl_lookup_code_address(void *ip, int skipC)\n \n DLLEXPORT jl_value_t *jl_get_backtrace(void)\n {\n-    if (array_ptr_void_type == NULL)\n-        array_ptr_void_type = jl_apply_type((jl_value_t*)jl_array_type,\n-                                            jl_tuple2(jl_voidpointer_type,\n-                                                      jl_box_long(1)));\n-    jl_array_t *bt = jl_alloc_array_1d(array_ptr_void_type, bt_size);\n+    jl_tuple_t *tp = NULL;\n+    jl_array_t *bt = NULL;\n+    JL_GC_PUSH3(&tp, &bt, &array_ptr_void_type);\n+    if (array_ptr_void_type == NULL) {\n+        tp = jl_tuple2(jl_voidpointer_type, jl_box_long(1));\n+        array_ptr_void_type = jl_apply_type((jl_value_t*)jl_array_type, tp);\n+    }\n+    bt = jl_alloc_array_1d(array_ptr_void_type, bt_size);\n     memcpy(bt->data, bt_data, bt_size*sizeof(void*));\n+    JL_GC_POP();","path":"src/task.c","position":42,"original_position":42,"commit_id":"ff6fe38436e057b24d0c7e9a7c93014157e50c4b","original_commit_id":"ff6fe38436e057b24d0c7e9a7c93014157e50c4b","user":{"login":"vtjnash","id":330950,"avatar_url":"https://avatars.githubusercontent.com/u/330950?v=3","gravatar_id":"","url":"https://api.github.com/users/vtjnash","html_url":"https://github.com/vtjnash","followers_url":"https://api.github.com/users/vtjnash/followers","following_url":"https://api.github.com/users/vtjnash/following{/other_user}","gists_url":"https://api.github.com/users/vtjnash/gists{/gist_id}","starred_url":"https://api.github.com/users/vtjnash/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vtjnash/subscriptions","organizations_url":"https://api.github.com/users/vtjnash/orgs","repos_url":"https://api.github.com/users/vtjnash/repos","events_url":"https://api.github.com/users/vtjnash/events{/privacy}","received_events_url":"https://api.github.com/users/vtjnash/received_events","type":"User","site_admin":false},"body":"same comments here as `jl_backtrace_from_here`","created_at":"2015-02-22T02:38:45Z","updated_at":"2015-02-22T02:38:45Z","html_url":"https://github.com/JuliaLang/julia/pull/10275#discussion_r25128438","pull_request_url":"https://api.github.com/repos/JuliaLang/julia/pulls/10275","_links":{"self":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/25128438"},"html":{"href":"https://github.com/JuliaLang/julia/pull/10275#discussion_r25128438"},"pull_request":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/10275"}}},"pull_request":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/10275","id":29763279,"html_url":"https://github.com/JuliaLang/julia/pull/10275","diff_url":"https://github.com/JuliaLang/julia/pull/10275.diff","patch_url":"https://github.com/JuliaLang/julia/pull/10275.patch","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/10275","number":10275,"state":"open","locked":false,"title":"A collection of GC rooting/write barrier additions","user":{"login":"timholy","id":1525481,"avatar_url":"https://avatars.githubusercontent.com/u/1525481?v=3","gravatar_id":"","url":"https://api.github.com/users/timholy","html_url":"https://github.com/timholy","followers_url":"https://api.github.com/users/timholy/followers","following_url":"https://api.github.com/users/timholy/following{/other_user}","gists_url":"https://api.github.com/users/timholy/gists{/gist_id}","starred_url":"https://api.github.com/users/timholy/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/timholy/subscriptions","organizations_url":"https://api.github.com/users/timholy/orgs","repos_url":"https://api.github.com/users/timholy/repos","events_url":"https://api.github.com/users/timholy/events{/privacy}","received_events_url":"https://api.github.com/users/timholy/received_events","type":"User","site_admin":false},"body":"There may be many false alarms here; I made lots of small commits to make it easy to drop some.\r\n\r\nCC @JeffBezanson, 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