diff -Nru librdkafka-0.11.6/debian/changelog librdkafka-0.11.6/debian/changelog
--- librdkafka-0.11.6/debian/changelog	2018-11-04 17:41:48.000000000 +0000
+++ librdkafka-0.11.6/debian/changelog	2020-06-30 07:05:00.000000000 +0000
@@ -1,3 +1,13 @@
+librdkafka (0.11.6-1.1wmf1) buster-wikimedia; urgency=medium
+
+  * Add 672dbf42d2, which applies cleanly to 0.11.6 as
+    debian/patches/fix-timespec-conversion.diff. Backport d62dd0e7
+    as cnd-timewait-abs-logic.diff. Both patches might address the infinite
+    loop bug polling for messages we have seen in production with purged
+    (Bug: T256444)
+
+ -- Emanuele Rocca <ema@wikimedia.org>  Tue, 30 Jun 2020 07:05:00 +0000
+
 librdkafka (0.11.6-1.1) unstable; urgency=medium
 
   * Non-maintainer upload.
diff -Nru librdkafka-0.11.6/debian/patches/cnd-timewait-abs-logic.diff librdkafka-0.11.6/debian/patches/cnd-timewait-abs-logic.diff
--- librdkafka-0.11.6/debian/patches/cnd-timewait-abs-logic.diff	1970-01-01 00:00:00.000000000 +0000
+++ librdkafka-0.11.6/debian/patches/cnd-timewait-abs-logic.diff	2020-06-30 07:05:00.000000000 +0000
@@ -0,0 +1,31 @@
+Description: backport of patch d62dd0e7
+Author: Emanuele Rocca <ema@wikimedia.org>
+Origin: https://github.com/edenhill/librdkafka/commit/d62dd0e7f16cde184e7c809a01ed5aa06861b660
+From d62dd0e7f16cde184e7c809a01ed5aa06861b660 Mon Sep 17 00:00:00 2001
+From: Roger Clermont <roger.clermont@crowdstrike.com>
+Date: Thu, 31 Jan 2019 02:23:52 +0000
+Subject: [PATCH] Revise logic for testing retval of cnd_timedwait_abs() to
+ account for conditions other than timeout.
+
+--- librdkafka-0.11.6.orig/src/rdkafka_queue.c
++++ librdkafka-0.11.6/src/rdkafka_queue.c
+@@ -372,8 +372,8 @@ rd_kafka_op_t *rd_kafka_q_pop_serve (rd_
+ 
+                         if (cnd_timedwait_abs(&rkq->rkq_cond,
+                                               &rkq->rkq_lock,
+-                                              &timeout_tspec) ==
+-                            thrd_timedout) {
++                                              &timeout_tspec) !=
++                            thrd_success) {
+ 				mtx_unlock(&rkq->rkq_lock);
+ 				return NULL;
+ 			}
+@@ -530,7 +530,7 @@ int rd_kafka_q_serve_rkmessages (rd_kafk
+ 
+                 while (!(rko = TAILQ_FIRST(&rkq->rkq_q)) &&
+                        cnd_timedwait_abs(&rkq->rkq_cond, &rkq->rkq_lock,
+-                                         &timeout_tspec) != thrd_timedout)
++                                         &timeout_tspec) == thrd_success)
+                         ;
+ 
+ 		if (!rko) {
diff -Nru librdkafka-0.11.6/debian/patches/fix-timespec-conversion.diff librdkafka-0.11.6/debian/patches/fix-timespec-conversion.diff
--- librdkafka-0.11.6/debian/patches/fix-timespec-conversion.diff	1970-01-01 00:00:00.000000000 +0000
+++ librdkafka-0.11.6/debian/patches/fix-timespec-conversion.diff	2020-06-30 07:05:00.000000000 +0000
@@ -0,0 +1,25 @@
+Origin: https://github.com/edenhill/librdkafka/commit/672dbf42d2a0ab8694be160740dad48554178a7c
+From 672dbf42d2a0ab8694be160740dad48554178a7c Mon Sep 17 00:00:00 2001
+From: Magnus Edenhill <magnus@edenhill.se>
+Date: Tue, 20 Nov 2018 10:18:39 +0100
+Subject: [PATCH] Fix timespec conversion to avoid infinite loop (#2108,
+ @boatfish)
+
+Identified and proposed fix by @boatfish
+---
+ src/rdtime.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+Index: librdkafka-0.11.6/src/rdtime.h
+===================================================================
+--- librdkafka-0.11.6.orig/src/rdtime.h
++++ librdkafka-0.11.6/src/rdtime.h
+@@ -172,7 +172,7 @@ static RD_INLINE void rd_timeout_init_ti
+                 timespec_get(tspec, TIME_UTC);
+                 tspec->tv_sec  += timeout_ms / 1000;
+                 tspec->tv_nsec += (timeout_ms % 1000) * 1000000;
+-                if (tspec->tv_nsec > 1000000000) {
++                if (tspec->tv_nsec >= 1000000000) {
+                         tspec->tv_nsec -= 1000000000;
+                         tspec->tv_sec++;
+                 }
diff -Nru librdkafka-0.11.6/debian/patches/series librdkafka-0.11.6/debian/patches/series
--- librdkafka-0.11.6/debian/patches/series	2018-11-04 17:41:18.000000000 +0000
+++ librdkafka-0.11.6/debian/patches/series	2020-06-30 07:05:00.000000000 +0000
@@ -1 +1,3 @@
 hurd.diff
+cnd-timewait-abs-logic.diff
+fix-timespec-conversion.diff