D7797.diff
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	Index: scripts/__init_script__.php
	===================================================================
	--- scripts/__init_script__.php
	+++ scripts/__init_script__.php
	@@ -65,6 +65,22 @@
	require_once $root.'/src/__phutil_library_init__.php';

	PhutilErrorHandler::initialize();
	+
	+ // If possible, install a signal handler for SIGHUP which prints the current
	+ // backtrace out to a named file. This is particularly helpful in debugging
	+ // hung/spinning processes.
	+ if (function_exists('pcntl_signal')) {
	+ pcntl_signal(SIGHUP, '__phutil_signal_handler__');
	+ }
	+}
	+
	+function __phutil_signal_handler__($signal_number) {
	+ $e = new Exception();
	+ $pid = getmypid();
	+ // Some phabricator daemons may not be attached to a terminal.
	+ Filesystem::writeFile(
	+ sys_get_temp_dir().'/phabricator_backtrace_'.$pid,
	+ $e->getTraceAsString());
	}

	__phutil_init_script__();