From 56f53a48bfe5adb7a62fb621e97c6e589789b9bf Mon Sep 17 00:00:00 2001
From: Skirmantas Jurgaitis <skirmantas.jurgaitis@tangentlabs.co.uk>
Date: Thu, 21 Jan 2016 17:52:43 +0000
Subject: [PATCH] Fix for #3863: validators are not thread safe

https://github.com/tomchristie/django-rest-framework/issues/3863
---
 rest_framework/fields.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index a2b0f3bf1..41f5c07ae 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -491,6 +491,9 @@ class Field(object):
         errors = []
         for validator in self.validators:
             if hasattr(validator, 'set_context'):
+                # Need to make a copy, because validator instances often
+                # are initialised globally
+                validator = copy.deepcopy(validator)
                 validator.set_context(self)
 
             try: