[crashdump_viewer] Display abort reason when truncated

If a crashdump is truncated due to size limit reached, a new 'abort'
tag with reason is added at the end of the crashdump. This reason is
now displayed along with the truncated-warning.

3 files changed, 72 insertions, 15 deletions

diff --git a/lib/observer/src/cdv_mem_cb.erl b/lib/observer/src/cdv_mem_cb.erl
index ba972d6963..abeddc7335 100644
--- a/lib/observer/src/cdv_mem_cb.erl
+++ b/lib/observer/src/cdv_mem_cb.erl
@@ -77,6 +77,10 @@ fix_alloc([{Title,Columns,Data}|Tables]) ->
      fix_alloc(Tables)];
 fix_alloc([{Title,[{_,V}|_]=Data}|Tables]) ->
     fix_alloc([{Title,lists:duplicate(length(V),[]),Data}|Tables]);
+fix_alloc([{"",[]}|Tables]) -> % no name and no data, probably truncated dump
+    fix_alloc(Tables);
+fix_alloc([{Title,[]=Data}|Tables]) -> % no data, probably truncated dump
+    fix_alloc([{Title,[],Data}|Tables]);
 fix_alloc([]) ->
     [].
 
diff --git a/lib/observer/src/crashdump_viewer.erl b/lib/observer/src/crashdump_viewer.erl
index 9268dac180..2f9f81104a 100644
--- a/lib/observer/src/crashdump_viewer.erl
+++ b/lib/observer/src/crashdump_viewer.erl
@@ -90,6 +90,7 @@
 
 
 %% All possible tags - use macros in order to avoid misspelling in the code
+-define(abort,abort).
 -define(allocated_areas,allocated_areas).
 -define(allocator,allocator).
 -define(atoms,atoms).
@@ -321,8 +322,16 @@ handle_call(general_info,_From,State=#state{file=File}) ->
     NumAtoms = GenInfo#general_info.num_atoms,
     WS = parse_vsn_str(GenInfo#general_info.system_vsn,4),
     TW = case get(truncated) of
-	     true -> ["WARNING: The crash dump is truncated. "
-		      "Some information might be missing."];
+	     true ->
+                 case get(truncated_reason) of
+                     undefined ->
+                         ["WARNING: The crash dump is truncated. "
+                          "Some information might be missing."];
+                     Reason ->
+                         ["WARNING: The crash dump is truncated "
+                          "("++Reason++"). "
+                          "Some information might be missing."]
+                 end;
 	     false -> []
 	 end,
     ets:insert(cdv_reg_proc_table,
@@ -515,8 +524,15 @@ truncated_warning([Tag|Tags]) ->
 	false -> truncated_warning(Tags)
     end.
 truncated_warning() ->
-    ["WARNING: The crash dump is truncated here. "
-     "Some information might be missing."].
+    case get(truncated_reason) of
+        undefined ->
+            ["WARNING: The crash dump is truncated here. "
+             "Some information might be missing."];
+        Reason ->
+            ["WARNING: The crash dump is truncated here "
+             "("++Reason++"). "
+             "Some information might be missing."]
+    end.
 
 truncated_here(Tag) ->
     case get(truncated) of
@@ -692,6 +708,7 @@ val(Fd, NoExist) ->
 	{eof,[]} -> NoExist;
 	[] -> NoExist;
 	{eof,Val} -> Val;
+        "=abort:"++_ -> NoExist;
 	Val -> Val
     end.
 
@@ -787,7 +804,7 @@ do_read_file(File) ->
 			?erl_crash_dump ->
 			    reset_index_table(),
 			    insert_index(Tag,Id,N1+1),
-			    put(last_tag,{Tag,""}),
+			    put_last_tag(Tag,""),
 			    indexify(Fd,Rest,N1),
 			    end_progress(),
 			    check_if_truncated(),
@@ -831,7 +848,7 @@ indexify(Fd,Bin,N) ->
 	    <<_:Pos/binary,TagAndRest/binary>> = Bin,
 	    {Tag,Id,Rest,N1} = tag(Fd,TagAndRest,N+Pos),
 	    insert_index(Tag,Id,N1+1), % +1 to get past newline
-	    put(last_tag,{Tag,Id}),
+	    put_last_tag(Tag,Id),
 	    indexify(Fd,Rest,N1);
 	nomatch ->
 	    case progress_read(Fd) of
@@ -1174,7 +1191,11 @@ parse_link_list("{from,"++Str,Links,Monitors,MonitoredBy) ->
 parse_link_list(", "++Rest,Links,Monitors,MonitoredBy) ->
     parse_link_list(Rest,Links,Monitors,MonitoredBy);
 parse_link_list([],Links,Monitors,MonitoredBy) ->
-    {lists:reverse(Links),lists:reverse(Monitors),lists:reverse(MonitoredBy)}.
+    {lists:reverse(Links),lists:reverse(Monitors),lists:reverse(MonitoredBy)};
+parse_link_list(Unexpected,Links,Monitors,MonitoredBy) ->
+    io:format("WARNING: found unexpected data in link list:~n~s~n",[Unexpected]),
+    parse_link_list([],Links,Monitors,MonitoredBy).
+
 
 parse_port(Str) ->
     {Port,Rest} = parse_link(Str,[]),
@@ -1813,16 +1834,16 @@ main_modinfo(_Fd,LM,_LineHead) ->
 all_modinfo(Fd,LM,LineHead) ->
     case LineHead of
 	"Current attributes" ->
-	    Str = hex_to_str(val(Fd)),
+	    Str = hex_to_str(val(Fd,"")),
 	    LM#loaded_mod{current_attrib=Str};
 	"Current compilation info" ->
-	    Str = hex_to_str(val(Fd)),
+	    Str = hex_to_str(val(Fd,"")),
 	    LM#loaded_mod{current_comp_info=Str};
 	"Old attributes" ->
-	    Str = hex_to_str(val(Fd)),
+	    Str = hex_to_str(val(Fd,"")),
 	    LM#loaded_mod{old_attrib=Str};
 	"Old compilation info" ->
-	    Str = hex_to_str(val(Fd)),
+	    Str = hex_to_str(val(Fd,"")),
 	    LM#loaded_mod{old_comp_info=Str};
 	Other ->
 	    unexpected(Fd,Other,"loaded modules info"),
@@ -1848,7 +1869,12 @@ hex_to_term([],Acc) ->
 	     Bin};
 	Term ->
 	    Term
-    end.
+    end;
+hex_to_term(Rest,Acc) ->
+    {"WARNING: The term is probably truncated!",
+     "I can not convert hex to term.",
+     Rest,list_to_binary(lists:reverse(Acc))}.
+
 
 hex_to_dec("F") -> 15;
 hex_to_dec("E") -> 14;
@@ -2159,7 +2185,8 @@ sort_allocator_types([{Name,Data}|Allocators],Acc,DoTotal) ->
     Type =
 	case string:tokens(Name,"[]") of
 	    [T,_Id] -> T;
-	    [Name] -> Name
+	    [Name] -> Name;
+            Other -> Other
 	end,
     TypeData = proplists:get_value(Type,Acc,[]),
     {NewTypeData,NewDoTotal} = sort_type_data(Type,Data,TypeData,DoTotal),
@@ -2686,6 +2713,7 @@ count_index(Tag) ->
 %%-----------------------------------------------------------------
 %% Convert tags read from crashdump to atoms used as first part of key
 %% in cdv_dump_index_table
+tag_to_atom("abort") -> ?abort;
 tag_to_atom("allocated_areas") -> ?allocated_areas;
 tag_to_atom("allocator") -> ?allocator;
 tag_to_atom("atoms") -> ?atoms;
@@ -2720,6 +2748,14 @@ tag_to_atom(UnknownTag) ->
     list_to_atom(UnknownTag).
 
 %%%-----------------------------------------------------------------
+%%% Store last tag for use when truncated, and reason if aborted
+put_last_tag(?abort,Reason) ->
+    %% Don't overwrite the real last tag
+    put(truncated_reason,Reason);
+put_last_tag(Tag,Id) ->
+    put(last_tag,{Tag,Id}).
+
+%%%-----------------------------------------------------------------
 %%% Fetch next chunk from crashdump file
 lookup_and_parse_index(File,What,ParseFun,Str) when is_list(File) ->
     Indices = lookup_index(What),
@@ -2815,7 +2851,16 @@ collect(Pids,Acc) ->
 	    update_progress(),
 	    collect(Pids,Acc);
 	{'DOWN', _Ref, process, Pid, {pmap_done,Result}} ->
-	    collect(lists:delete(Pid,Pids),[Result|Acc])
+	    collect(lists:delete(Pid,Pids),[Result|Acc]);
+        {'DOWN', _Ref, process, Pid, _Error} ->
+            Warning =
+                "WARNING: an error occured while parsing data.\n" ++
+                case get(truncated) of
+                    true -> "This might be because the dump is truncated.\n";
+                    false -> ""
+                end,
+            io:format(Warning),
+            collect(lists:delete(Pid,Pids),Acc)
     end.
 
 %%%-----------------------------------------------------------------
diff --git a/lib/observer/test/crashdump_viewer_SUITE.erl b/lib/observer/test/crashdump_viewer_SUITE.erl
index 73ed890802..8df69c6624 100644
--- a/lib/observer/test/crashdump_viewer_SUITE.erl
+++ b/lib/observer/test/crashdump_viewer_SUITE.erl
@@ -420,6 +420,10 @@ special(File,Procs) ->
 	%% ".trunc" ->
 	%%     %% ????
 	%%     ok;
+        ".trunc.bytes" ->
+            {ok,_,[TW]} = crashdump_viewer:general_info(),
+            {match,_} = re:run(TW,"CRASH DUMP SIZE LIMIT REACHED"),
+            ok;
 	_ ->
 	    ok
     end,
@@ -481,7 +485,11 @@ do_create_dumps(DataDir,Rel) ->
 	current ->
 	    CD3 = dump_with_args(DataDir,Rel,"instr","+Mim true"),
 	    CD4 = dump_with_strange_module_name(DataDir,Rel,"strangemodname"),
-	    {[CD1,CD2,CD3,CD4], DosDump};
+            Bytes = rand:uniform(300000) + 100,
+            CD5 = dump_with_args(DataDir,Rel,"trunc.bytes",
+                                 "-env ERL_CRASH_DUMP_BYTES " ++
+                                     integer_to_list(Bytes)),
+	    {[CD1,CD2,CD3,CD4,CD5], DosDump};
 	_ ->
 	    {[CD1,CD2], DosDump}
     end.