Ignore updates from non-tracked subtrees during modify/modrdn/update to avoid deadlocks with retro changelog
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Alexander Bokovoy
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29d38010ad
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0c724e7262
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e5a84cf93b13b174c6d865de2f735cbfbc950917 slapi-nis-0.60.0.tar.gz
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From ee94788e63d9f35daca7c0d1e80a488f738a9c52 Mon Sep 17 00:00:00 2001
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From: Thierry Bordaz <tbordaz@redhat.com>
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Date: Fri, 1 Sep 2023 11:02:08 +0200
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Subject: [PATCH 1/2] BZ 2124214 - schema compat plugin deadlock on delete post
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op
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Bug description:
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backends locks (SC map and retroCL) are acquired in
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the opposite order
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(https://bugzilla.redhat.com/show_bug.cgi?id=2124214#c17)
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Fix description:
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Credits of the fix are to Pierre Rogier who found
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a reproducible testcase, did the fix and verified it.
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In specific condition of retroCL trimming the DEL
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callback of the SC should check if the backend should
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be ignored
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relates: 2124214
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---
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src/back-shr.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/src/back-shr.c b/src/back-shr.c
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index ce2b1f3..1792bef 100644
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--- a/src/back-shr.c
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+++ b/src/back-shr.c
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@@ -2811,6 +2811,18 @@ backend_shr_delete_cb(Slapi_PBlock *pb)
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if (wrap_get_call_level() > 0) {
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return 0;
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}
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+ /* especially important to test if we want to prevent frequent
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+ * deadlocks when backends are accesses in opposite order.
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+ * i.e. "regular" update on domain map+retroCL and retroCL trimming
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+ * retroCL+domain map
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+ */
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+ if (backend_shr_write_ignore(pb)) {
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+#if DEBUG_MAP_LOCK
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+ slapi_log_error(SLAPI_LOG_FATAL, "schema-compat",
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+ "backend_shr_delete_cb: (%p) operation is not impacting schema compat\n", PR_MyThreadId(), 1);
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+#endif
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+ return 0;
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+ }
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/* Read parameters from the pblock. */
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slapi_pblock_get(pb, SLAPI_PLUGIN_PRIVATE, &cbdata.state);
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--
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2.41.0
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From 61fcf534c3da767788e27641f3ebfe4d6a6c0b25 Mon Sep 17 00:00:00 2001
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From: Alexander Bokovoy <abokovoy@redhat.com>
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Date: Mon, 9 Oct 2023 13:53:28 +0300
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Subject: [PATCH 2/2] Add more ignores to modrdn and modify cases
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BZ 2124214 - schema compat plugin deadlock on delete post op
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Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
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---
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src/back-shr.c | 18 ++++++++++++++++++
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1 file changed, 18 insertions(+)
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diff --git a/src/back-shr.c b/src/back-shr.c
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index 1792bef..4cbc39b 100644
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--- a/src/back-shr.c
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+++ b/src/back-shr.c
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@@ -2463,6 +2463,15 @@ backend_shr_modify_cb(Slapi_PBlock *pb)
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/* No data yet, ignore */
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return 0;
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}
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+
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+ if (backend_shr_write_ignore(pb)) {
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+#if DEBUG_MAP_LOCK
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+ slapi_log_error(SLAPI_LOG_FATAL, "schema-compat",
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+ "backend_shr_modify_cb: (%p) operation is not impacting schema compat\n", PR_MyThreadId(), 1);
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+#endif
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+ return 0;
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+ }
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+
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slapi_pblock_get(pb, SLAPI_MODIFY_TARGET, &dn);
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slapi_pblock_get(pb, SLAPI_MODIFY_MODS, &cbdata.mods);
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slapi_pblock_get(pb, SLAPI_ENTRY_PRE_OP, &cbdata.e_pre);
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@@ -2669,6 +2678,15 @@ backend_shr_modrdn_cb(Slapi_PBlock *pb)
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/* No data yet, ignore */
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return 0;
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}
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+
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+ if (backend_shr_write_ignore(pb)) {
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+#if DEBUG_MAP_LOCK
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+ slapi_log_error(SLAPI_LOG_FATAL, "schema-compat",
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+ "backend_shr_modrdn_cb: (%p) operation is not impacting schema compat\n", PR_MyThreadId(), 1);
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+#endif
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+ return 0;
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+ }
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+
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slapi_pblock_get(pb, SLAPI_ENTRY_PRE_OP, &cbdata.e_pre);
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slapi_pblock_get(pb, SLAPI_ENTRY_POST_OP, &cbdata.e_post);
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--
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2.41.0
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@ -11,7 +11,7 @@
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Name: slapi-nis
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Version: 0.60.0
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Release: 3%{?dist}
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Release: 4%{?dist}
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Summary: NIS Server and Schema Compatibility plugins for Directory Server
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Group: System Environment/Daemons
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License: GPLv3
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@ -19,6 +19,7 @@ URL: http://pagure.io/slapi-nis/
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Source0: https://releases.pagure.org/slapi-nis/slapi-nis-%{version}.tar.gz
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Source1: https://releases.pagure.org/slapi-nis/slapi-nis-%{version}.tar.gz.asc
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Patch0: slapi-nis-bz2183469.patch
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Patch1: slapi-nis-RHEL-5134.patch
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BuildRequires: make
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BuildRequires: autoconf
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@ -59,6 +60,7 @@ for attributes from multiple entries in the tree.
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%prep
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%setup -q
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%patch0 -p1
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%patch1 -p1
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%build
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autoconf --force
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@ -87,6 +89,11 @@ make check
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%{_sbindir}/nisserver-plugin-defs
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%changelog
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* Tue Oct 10 2023 Alexander Bokovoy <abokovoy@redhat.com> - 0.60.0-4
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- Ignore updates from non-tracked subtrees during modify/modrdn/update
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to avoid deadlocks with retro changelog
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- Resolves: RHEL-5134
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* Mon Apr 24 2023 Alexander Bokovoy <abokovoy@redhat.com> - 0.60.0-3
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- Also handle base searches within the compat tree
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- Related: rhbz#2183469
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