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Add GUC backtrace_on_internal_error

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When enabled (default off), this logs a backtrace anytime elog() or an
equivalent ereport() for internal errors is called.

This is not well covered by the existing backtrace_functions, because
there are many equally-worded low-level errors in many functions.  And
if you find out where the error is, then you need to manually rewrite
the elog() to ereport() to attach the errbacktrace(), which is
annoying.  Having a backtrace automatically on every elog() call could
be very helpful during development for various kinds of common errors
from palloc, syscache, node support, etc.

Discussion: https://www.postgresql.org/message-id/flat/ba76c6bc-f03f-4285-bf16-47759cfcab9e@eisentraut.org
This commit is contained in:
Peter Eisentraut
2023-12-30 11:11:26 +01:00
parent 9d49837d71
commit a740b213d4
4 changed files with 44 additions and 3 deletions
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27
doc/src/sgml/config.sgml
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@ -11086,6 +11086,33 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
</listitem>
</varlistentry>
<varlistentry id="guc-backtrace-on-internal-error" xreflabel="backtrace_on_internal_error">
<term><varname>backtrace_on_internal_error</varname> (<type>boolean</type>)
<indexterm>
<primary><varname>backtrace_on_internal_error</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
If this parameter is on and an error with error code XX000 (internal
error; see also <xref linkend="errcodes-appendix"/>) is raised, then a
backtrace is written to the server log together with the error
message. This can be used to debug such internal errors (which should
normally not happen in production). The default is off.
</para>
<para>
Backtrace support is not available on all platforms, and the quality
of the backtraces depends on compilation options.
</para>
<para>
Only superusers and users with the appropriate <literal>SET</literal>
privilege can change this setting.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-debug-discard-caches" xreflabel="debug_discard_caches">
<term><varname>debug_discard_caches</varname> (<type>integer</type>)
<indexterm>