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authorSiri Hansen <[email protected]>2017-09-07 15:46:35 +0200
committerSiri Hansen <[email protected]>2017-09-13 17:55:47 +0200
commit903a289213aa22b5c9c42ead2599174c2cf15b95 (patch)
tree868c0bc634a88952aceaaaa22735461fe1b4b4cd
parent858254fc02e4c9ef2ea16275b2dfe60707ebb069 (diff)
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cdv: Find end of 'Last calls' section
This is a bug fix: the end of the 'Last calls' section is meant to be an empty line, but in some situations this is not the case. This could cause the complete dump to be read and stored as 'Last calls', causing very unexpected behavior in the crashdump viewer. This commit adds a check for ": ", which indicates that a new heading has occured and thus the 'Last calls' section is completly read.
-rw-r--r--lib/observer/src/crashdump_viewer.erl88
-rw-r--r--lib/observer/test/crashdump_viewer_SUITE.erl3
2 files changed, 64 insertions, 27 deletions
diff --git a/lib/observer/src/crashdump_viewer.erl b/lib/observer/src/crashdump_viewer.erl
index 9f68fee942..f7c44628cf 100644
--- a/lib/observer/src/crashdump_viewer.erl
+++ b/lib/observer/src/crashdump_viewer.erl
@@ -748,32 +748,6 @@ get_rest_of_line_1(Fd, <<>>, Acc) ->
eof -> {eof,lists:reverse(Acc)}
end.
-get_lines_to_empty(Fd) ->
- case get_chunk(Fd) of
- {ok,Bin} ->
- get_lines_to_empty(Fd,Bin,[],[]);
- eof ->
- []
- end.
-get_lines_to_empty(Fd,<<$\n:8,Bin/binary>>,[],Lines) ->
- put_chunk(Fd,Bin),
- lists:reverse(Lines);
-get_lines_to_empty(Fd,<<$\n:8,Bin/binary>>,Acc,Lines) ->
- get_lines_to_empty(Fd,Bin,[],[byte_list_to_string(lists:reverse(Acc))|Lines]);
-get_lines_to_empty(Fd,<<$\r:8,Bin/binary>>,Acc,Lines) ->
- get_lines_to_empty(Fd,Bin,Acc,Lines);
-get_lines_to_empty(Fd,<<$\s:8,Bin/binary>>,[],Lines) ->
- get_lines_to_empty(Fd,Bin,[],Lines);
-get_lines_to_empty(Fd,<<Char:8,Bin/binary>>,Acc,Lines) ->
- get_lines_to_empty(Fd,Bin,[Char|Acc],Lines);
-get_lines_to_empty(Fd,<<>>,Acc,Lines) ->
- case get_chunk(Fd) of
- {ok,Bin} ->
- get_lines_to_empty(Fd,Bin,Acc,Lines);
- eof ->
- lists:reverse(Lines,[byte_list_to_string(lists:reverse(Acc))])
- end.
-
split(Str) ->
split($ ,Str,[]).
split(Char,Str) ->
@@ -1182,7 +1156,7 @@ all_procinfo(Fd,Fun,Proc,WS,LineHead) ->
get_procinfo(Fd,Fun,Proc#proc{old_heap_end=bytes(Fd)},WS);
%% - END - moved from get_procinfo -
"Last calls" ->
- get_procinfo(Fd,Fun,Proc#proc{last_calls=get_lines_to_empty(Fd)},WS);
+ get_procinfo(Fd,Fun,Proc#proc{last_calls=get_last_calls(Fd)},WS);
"Link list" ->
{Links,Monitors,MonitoredBy} = parse_link_list(bytes(Fd),[],[],[]),
get_procinfo(Fd,Fun,Proc#proc{links=Links,
@@ -1206,6 +1180,66 @@ all_procinfo(Fd,Fun,Proc,WS,LineHead) ->
get_procinfo(Fd,Fun,Proc,WS)
end.
+%% The end of the 'Last calls' section is meant to be an empty line,
+%% but in some cases this is not the case, so we also need to look for
+%% the next heading which currently (OTP-20.1) can be "Link list: ",
+%% "Dictionary: " or "Reductions: ". We do this by looking for ": "
+%% and when found, pushing the heading back into the saved chunk.
+%%
+%% Note that the 'Last calls' section is only present if the
+%% 'save_calls' process flag is set.
+get_last_calls(Fd) ->
+ case get_chunk(Fd) of
+ {ok,Bin} ->
+ get_last_calls(Fd,Bin,[],[]);
+ eof ->
+ []
+ end.
+get_last_calls(Fd,<<$\n:8,Bin/binary>>,[],Lines) ->
+ %% Empty line - we're done
+ put_chunk(Fd,Bin),
+ lists:reverse(Lines);
+get_last_calls(Fd,<<$::8>>,Acc,Lines) ->
+ case get_chunk(Fd) of
+ {ok,Bin} ->
+ %% Could be a colon followed by a space - see next function clause
+ get_last_calls(Fd,<<$::8,Bin/binary>>,Acc,Lines);
+ eof ->
+ %% Truncated here - either we've got the next heading, or
+ %% it was truncated in a last call function, in which case
+ %% we note that it was truncated
+ case byte_list_to_string(lists:reverse(Acc)) of
+ NextHeading when NextHeading=="Link list";
+ NextHeading=="Dictionary";
+ NextHeading=="Reductions" ->
+ put_chunk(Fd,list_to_binary(NextHeading++":")),
+ lists:reverse(Lines);
+ LastCallFunction->
+ lists:reverse(Lines,[LastCallFunction++":...(truncated)"])
+ end
+ end;
+get_last_calls(Fd,<<$\::8,$\s:8,Bin/binary>>,Acc,Lines) ->
+ %% ": " - means we have the next heading in Acc - save it back
+ %% into the chunk and return the lines we've found
+ HeadingBin = list_to_binary(lists:reverse(Acc,[$:])),
+ put_chunk(Fd,<<HeadingBin/binary,Bin/binary>>),
+ lists:reverse(Lines);
+get_last_calls(Fd,<<$\n:8,Bin/binary>>,Acc,Lines) ->
+ get_last_calls(Fd,Bin,[],[byte_list_to_string(lists:reverse(Acc))|Lines]);
+get_last_calls(Fd,<<$\r:8,Bin/binary>>,Acc,Lines) ->
+ get_last_calls(Fd,Bin,Acc,Lines);
+get_last_calls(Fd,<<$\s:8,Bin/binary>>,[],Lines) ->
+ get_last_calls(Fd,Bin,[],Lines);
+get_last_calls(Fd,<<Char:8,Bin/binary>>,Acc,Lines) ->
+ get_last_calls(Fd,Bin,[Char|Acc],Lines);
+get_last_calls(Fd,<<>>,Acc,Lines) ->
+ case get_chunk(Fd) of
+ {ok,Bin} ->
+ get_last_calls(Fd,Bin,Acc,Lines);
+ eof ->
+ lists:reverse(Lines,[byte_list_to_string(lists:reverse(Acc))])
+ end.
+
parse_link_list([SB|Str],Links,Monitors,MonitoredBy) when SB==$[; SB==$] ->
parse_link_list(Str,Links,Monitors,MonitoredBy);
parse_link_list("#Port"++_=Str,Links,Monitors,MonitoredBy) ->
diff --git a/lib/observer/test/crashdump_viewer_SUITE.erl b/lib/observer/test/crashdump_viewer_SUITE.erl
index 77cf086d4b..4b0127bcfb 100644
--- a/lib/observer/test/crashdump_viewer_SUITE.erl
+++ b/lib/observer/test/crashdump_viewer_SUITE.erl
@@ -364,6 +364,9 @@ special(File,Procs) ->
crashdump_viewer:expand_binary({SOffset,SSize,SPos}),
io:format(" expand binary ok",[]),
+ #proc{last_calls=LastCalls} = ProcDetails,
+ true = length(LastCalls) =< 4,
+
['#CDVPid',X1,Y1,Z1] = proplists:get_value(ext_pid,Dict),
ChannelStr1 = integer_to_list(X1),
ExtPid =