glusterfs/SOURCES/0095-cluster-afr-Remove-local-from-owners_list-on-failure.patch

From cca418b78ec976aa69eacd56b0e6127ea7e3dd26 Mon Sep 17 00:00:00 2001
From: Pranith Kumar K <pkarampu@redhat.com>
Date: Thu, 4 Apr 2019 15:31:56 +0530
Subject: [PATCH 095/124] cluster/afr: Remove local from owners_list on failure
 of lock-acquisition

	Backport of https://review.gluster.org/c/glusterfs/+/22515

When eager-lock lock acquisition fails because of say network failures, the
local is not being removed from owners_list, this leads to accumulation of
waiting frames and the application will hang because the waiting frames are
under the assumption that another transaction is in the process of acquiring
lock because owner-list is not empty. Handled this case as well in this patch.
Added asserts to make it easier to find these problems in future.

Change-Id: I3101393265e9827755725b1f2d94a93d8709e923
fixes: bz#1688395
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/167859
Tested-by: RHGS Build Bot <nigelb@redhat.com>
Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
---
 tests/bugs/replicate/bug-1696599-io-hang.t | 47 ++++++++++++++++++++++++++++++
 xlators/cluster/afr/src/afr-common.c       |  8 ++---
 xlators/cluster/afr/src/afr-lk-common.c    |  1 -
 xlators/cluster/afr/src/afr-transaction.c  | 19 +++++-------
 xlators/cluster/afr/src/afr.h              |  4 +--
 5 files changed, 61 insertions(+), 18 deletions(-)
 create mode 100755 tests/bugs/replicate/bug-1696599-io-hang.t

diff --git a/tests/bugs/replicate/bug-1696599-io-hang.t b/tests/bugs/replicate/bug-1696599-io-hang.t
new file mode 100755
index 0000000..869cdb9
--- /dev/null
+++ b/tests/bugs/replicate/bug-1696599-io-hang.t
@@ -0,0 +1,47 @@
+#!/bin/bash
+
+. $(dirname $0)/../../include.rc
+. $(dirname $0)/../../volume.rc
+. $(dirname $0)/../../fileio.rc
+
+#Tests that local structures in afr are removed from granted/blocked list of
+#locks when inodelk fails on all bricks
+
+cleanup;
+
+TEST glusterd
+TEST pidof glusterd
+
+TEST $CLI volume create $V0 replica 3 $H0:$B0/${V0}{1..3}
+TEST $CLI volume set $V0 performance.quick-read off
+TEST $CLI volume set $V0 performance.write-behind off
+TEST $CLI volume set $V0 performance.io-cache off
+TEST $CLI volume set $V0 performance.stat-prefetch off
+TEST $CLI volume set $V0 performance.client-io-threads off
+TEST $CLI volume set $V0 delay-gen locks
+TEST $CLI volume set $V0 delay-gen.delay-duration 5000000
+TEST $CLI volume set $V0 delay-gen.delay-percentage 100
+TEST $CLI volume set $V0 delay-gen.enable finodelk
+
+TEST $CLI volume start $V0
+EXPECT 'Started' volinfo_field $V0 'Status'
+
+TEST $GFS -s $H0 --volfile-id $V0 $M0
+TEST touch $M0/file
+#Trigger write and stop bricks so inodelks fail on all bricks leading to
+#lock failure condition
+echo abc >> $M0/file &
+
+TEST $CLI volume stop $V0
+TEST $CLI volume reset $V0 delay-gen
+wait
+TEST $CLI volume start $V0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_meta $M0 $V0-replicate-0 0
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_meta $M0 $V0-replicate-0 1
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_meta $M0 $V0-replicate-0 2
+#Test that only one write succeeded, this tests that delay-gen worked as
+#expected
+echo abc >> $M0/file
+EXPECT "abc" cat $M0/file
+
+cleanup;
diff --git a/xlators/cluster/afr/src/afr-common.c b/xlators/cluster/afr/src/afr-common.c
index 45b96e3..47a5d3a 100644
--- a/xlators/cluster/afr/src/afr-common.c
+++ b/xlators/cluster/afr/src/afr-common.c
@@ -5763,6 +5763,10 @@ afr_transaction_local_init(afr_local_t *local, xlator_t *this)
     afr_private_t *priv = NULL;
 
     priv = this->private;
+    INIT_LIST_HEAD(&local->transaction.wait_list);
+    INIT_LIST_HEAD(&local->transaction.owner_list);
+    INIT_LIST_HEAD(&local->ta_waitq);
+    INIT_LIST_HEAD(&local->ta_onwireq);
     ret = afr_internal_lock_init(&local->internal_lock, priv->child_count);
     if (ret < 0)
         goto out;
@@ -5800,10 +5804,6 @@ afr_transaction_local_init(afr_local_t *local, xlator_t *this)
         goto out;
 
     ret = 0;
-    INIT_LIST_HEAD(&local->transaction.wait_list);
-    INIT_LIST_HEAD(&local->transaction.owner_list);
-    INIT_LIST_HEAD(&local->ta_waitq);
-    INIT_LIST_HEAD(&local->ta_onwireq);
 out:
     return ret;
 }
diff --git a/xlators/cluster/afr/src/afr-lk-common.c b/xlators/cluster/afr/src/afr-lk-common.c
index 4091671..bc8eabe 100644
--- a/xlators/cluster/afr/src/afr-lk-common.c
+++ b/xlators/cluster/afr/src/afr-lk-common.c
@@ -397,7 +397,6 @@ afr_unlock_now(call_frame_t *frame, xlator_t *this)
     int_lock->lk_call_count = call_count;
 
     if (!call_count) {
-        GF_ASSERT(!local->transaction.do_eager_unlock);
         gf_msg_trace(this->name, 0, "No internal locks unlocked");
         int_lock->lock_cbk(frame, this);
         goto out;
diff --git a/xlators/cluster/afr/src/afr-transaction.c b/xlators/cluster/afr/src/afr-transaction.c
index 229820b..15f3a7e 100644
--- a/xlators/cluster/afr/src/afr-transaction.c
+++ b/xlators/cluster/afr/src/afr-transaction.c
@@ -372,6 +372,8 @@ afr_transaction_done(call_frame_t *frame, xlator_t *this)
     }
     local->transaction.unwind(frame, this);
 
+    GF_ASSERT(list_empty(&local->transaction.owner_list));
+    GF_ASSERT(list_empty(&local->transaction.wait_list));
     AFR_STACK_DESTROY(frame);
 
     return 0;
@@ -393,7 +395,7 @@ afr_lock_fail_shared(afr_local_t *local, struct list_head *list)
 }
 
 static void
-afr_handle_lock_acquire_failure(afr_local_t *local, gf_boolean_t locked)
+afr_handle_lock_acquire_failure(afr_local_t *local)
 {
     struct list_head shared;
     afr_lock_t *lock = NULL;
@@ -414,13 +416,8 @@ afr_handle_lock_acquire_failure(afr_local_t *local, gf_boolean_t locked)
     afr_lock_fail_shared(local, &shared);
     local->transaction.do_eager_unlock = _gf_true;
 out:
-    if (locked) {
-        local->internal_lock.lock_cbk = afr_transaction_done;
-        afr_unlock(local->transaction.frame, local->transaction.frame->this);
-    } else {
-        afr_transaction_done(local->transaction.frame,
-                             local->transaction.frame->this);
-    }
+    local->internal_lock.lock_cbk = afr_transaction_done;
+    afr_unlock(local->transaction.frame, local->transaction.frame->this);
 }
 
 call_frame_t *
@@ -619,7 +616,7 @@ afr_transaction_perform_fop(call_frame_t *frame, xlator_t *this)
     failure_count = AFR_COUNT(local->transaction.failed_subvols,
                               priv->child_count);
     if (failure_count == priv->child_count) {
-        afr_handle_lock_acquire_failure(local, _gf_true);
+        afr_handle_lock_acquire_failure(local);
         return 0;
     } else {
         lock = &local->inode_ctx->lock[local->transaction.type];
@@ -2092,7 +2089,7 @@ err:
     local->op_ret = -1;
     local->op_errno = op_errno;
 
-    afr_handle_lock_acquire_failure(local, _gf_true);
+    afr_handle_lock_acquire_failure(local);
 
     if (xdata_req)
         dict_unref(xdata_req);
@@ -2361,7 +2358,7 @@ afr_internal_lock_finish(call_frame_t *frame, xlator_t *this)
     } else {
         lock = &local->inode_ctx->lock[local->transaction.type];
         if (local->internal_lock.lock_op_ret < 0) {
-            afr_handle_lock_acquire_failure(local, _gf_false);
+            afr_handle_lock_acquire_failure(local);
         } else {
             lock->event_generation = local->event_generation;
             afr_changelog_pre_op(frame, this);
diff --git a/xlators/cluster/afr/src/afr.h b/xlators/cluster/afr/src/afr.h
index 2cc3797..e731cfa 100644
--- a/xlators/cluster/afr/src/afr.h
+++ b/xlators/cluster/afr/src/afr.h
@@ -1091,8 +1091,8 @@ afr_cleanup_fd_ctx(xlator_t *this, fd_t *fd);
 #define AFR_FRAME_INIT(frame, op_errno)                                        \
     ({                                                                         \
         frame->local = mem_get0(THIS->local_pool);                             \
-        if (afr_local_init(frame->local, THIS->private, &op_errno)) {          \
-            afr_local_cleanup(frame->local, THIS);                             \
+        if (afr_local_init(frame->local, frame->this->private, &op_errno)) {   \
+            afr_local_cleanup(frame->local, frame->this);                      \
             mem_put(frame->local);                                             \
             frame->local = NULL;                                               \
         };                                                                     \
-- 
1.8.3.1