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From b9b479de2a7fd1c5eefa7aa1142e0a39e0c96ca9 Mon Sep 17 00:00:00 2001
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From: Xavi Hernandez <xhernandez@redhat.com>
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Date: Sun, 1 Mar 2020 19:49:04 +0100
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Subject: [PATCH 419/449] cluster/afr: fix race when bricks come up
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The was a problem when self-heal was sending lookups at the same time
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that one of the bricks was coming up. In this case there was a chance
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that the number of 'up' bricks changes in the middle of sending the
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requests to subvolumes which caused a discrepancy in the expected
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number of replies and the actual number of sent requests.
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This discrepancy caused that AFR continued executing requests before
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all requests were complete. Eventually, the frame of the pending
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request was destroyed when the operation terminated, causing a use-
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after-free issue when the answer was finally received.
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In theory the same thing could happen in the reverse way, i.e. AFR
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tries to wait for more replies than sent requests, causing a hang.
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Backport of:
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> Upstream-patch-link: https://review.gluster.org/24191
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> Change-Id: I7ed6108554ca379d532efb1a29b2de8085410b70
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> Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
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> Fixes: bz#1808875
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BUG: 1794663
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Change-Id: I7ed6108554ca379d532efb1a29b2de8085410b70
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Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/202489
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Tested-by: RHGS Build Bot <nigelb@redhat.com>
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Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
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---
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xlators/cluster/afr/src/afr-self-heal-common.c | 6 +++---
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xlators/cluster/afr/src/afr-self-heal-name.c | 4 +++-
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xlators/cluster/afr/src/afr-self-heal.h | 7 +++++--
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3 files changed, 11 insertions(+), 6 deletions(-)
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diff --git a/xlators/cluster/afr/src/afr-self-heal-common.c b/xlators/cluster/afr/src/afr-self-heal-common.c
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index ce1ea50..d942ccf 100644
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--- a/xlators/cluster/afr/src/afr-self-heal-common.c
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+++ b/xlators/cluster/afr/src/afr-self-heal-common.c
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@@ -1869,12 +1869,12 @@ int
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afr_selfheal_unlocked_discover(call_frame_t *frame, inode_t *inode, uuid_t gfid,
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struct afr_reply *replies)
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{
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- afr_private_t *priv = NULL;
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+ afr_local_t *local = NULL;
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- priv = frame->this->private;
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+ local = frame->local;
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return afr_selfheal_unlocked_discover_on(frame, inode, gfid, replies,
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- priv->child_up);
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+ local->child_up);
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}
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unsigned int
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diff --git a/xlators/cluster/afr/src/afr-self-heal-name.c b/xlators/cluster/afr/src/afr-self-heal-name.c
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index 7d4f208..dace071 100644
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--- a/xlators/cluster/afr/src/afr-self-heal-name.c
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+++ b/xlators/cluster/afr/src/afr-self-heal-name.c
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@@ -560,13 +560,15 @@ afr_selfheal_name_unlocked_inspect(call_frame_t *frame, xlator_t *this,
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struct afr_reply *replies = NULL;
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inode_t *inode = NULL;
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int first_idx = -1;
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+ afr_local_t *local = NULL;
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priv = this->private;
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+ local = frame->local;
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replies = alloca0(sizeof(*replies) * priv->child_count);
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inode = afr_selfheal_unlocked_lookup_on(frame, parent, bname, replies,
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- priv->child_up, NULL);
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+ local->child_up, NULL);
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if (!inode)
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return -ENOMEM;
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diff --git a/xlators/cluster/afr/src/afr-self-heal.h b/xlators/cluster/afr/src/afr-self-heal.h
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index 8234cec..f7ecf5d 100644
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--- a/xlators/cluster/afr/src/afr-self-heal.h
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+++ b/xlators/cluster/afr/src/afr-self-heal.h
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@@ -46,13 +46,16 @@
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afr_local_t *__local = frame->local; \
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afr_private_t *__priv = frame->this->private; \
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int __i = 0; \
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- int __count = AFR_COUNT(list, __priv->child_count); \
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+ int __count = 0; \
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+ unsigned char *__list = alloca(__priv->child_count); \
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\
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+ memcpy(__list, list, sizeof(*__list) * __priv->child_count); \
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+ __count = AFR_COUNT(__list, __priv->child_count); \
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__local->barrier.waitfor = __count; \
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afr_local_replies_wipe(__local, __priv); \
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\
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for (__i = 0; __i < __priv->child_count; __i++) { \
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- if (!list[__i]) \
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+ if (!__list[__i]) \
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continue; \
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STACK_WIND_COOKIE(frame, rfn, (void *)(long)__i, \
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__priv->children[__i], \
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--
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1.8.3.1
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