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-rw-r--r--lib/stdlib/doc/src/gen_statem.xml13
-rw-r--r--lib/stdlib/src/gen_statem.erl4
2 files changed, 11 insertions, 6 deletions
diff --git a/lib/stdlib/doc/src/gen_statem.xml b/lib/stdlib/doc/src/gen_statem.xml
index 15e9584360..8462f5ff5f 100644
--- a/lib/stdlib/doc/src/gen_statem.xml
+++ b/lib/stdlib/doc/src/gen_statem.xml
@@ -1212,11 +1212,13 @@ erlang:'!' -----> Module:StateName/5
</type>
<desc>
<note>
- <p>This callback is optional, so callback modules need not
+ <p>This callback is optional, so a callback module need not
export it. The <c>gen_statem</c> module provides a default
- implementation of this function that returns the callback
- module state and data. The default function will also
- be used if this callback fails.
+ implementation of this function that returns
+ <c>{State,Data}</c>. If this callback fails the default
+ function will return <c>{State,Info}</c>
+ where <c>Info</c> informs of the crash but no details,
+ to hide possibly sensitive data.
</p>
</note>
<p>This function is called by a <c>gen_statem</c> process when:</p>
@@ -1270,7 +1272,8 @@ erlang:'!' -----> Module:StateName/5
</p>
<p>One use for this function is to return compact alternative
state representations to avoid having large state terms
- printed in logfiles.
+ printed in logfiles. Another is to hide sensitive data from
+ being written to the error log.
</p>
<p>This function may use
<seealso marker="erts:erlang#throw/1"><c>throw</c></seealso>,
diff --git a/lib/stdlib/src/gen_statem.erl b/lib/stdlib/src/gen_statem.erl
index 1ca2e1009c..b580eaab97 100644
--- a/lib/stdlib/src/gen_statem.erl
+++ b/lib/stdlib/src/gen_statem.erl
@@ -1214,7 +1214,9 @@ format_status(
catch
Result -> Result;
_:_ ->
- format_status_default(Opt, State, Data)
+ format_status_default(
+ Opt, State,
+ "Module:format_status/2 crashed")
end;
false ->
format_status_default(Opt, State, Data)