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From 10f1730073b9fb02d2ed7f7de855afd6df0e5202 Mon Sep 17 00:00:00 2001
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From: Xavi Hernandez <xhernandez@redhat.com>
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Date: Wed, 19 Feb 2020 12:24:15 +0100
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Subject: [PATCH 355/355] core: Prevent crash on process termination
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A previous patch (ce61da816a) has fixed a use-after-free issue,
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but it doesn't work well when the final cleanup is done at process
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termination because gluster doesn't stop other threads before
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calling exit().
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For this reason, the final cleanup is removed to avoid the crash,
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at least until the termination sequence properly stops all gluster
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threads before exiting the program.
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Upstream patch:
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> Upstream patch link: https://review.gluster.org/c/glusterfs/+/24138
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> Change-Id: Id7cfb4407fcf208e28f03a7c3cdc3ef9c1f3bf9b
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> Fixes: bz#1801684
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> Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
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Change-Id: Id7cfb4407fcf208e28f03a7c3cdc3ef9c1f3bf9b
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BUG: 1800703
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Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/192344
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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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libglusterfs/src/mem-pool.c | 30 +++++++++++-------------------
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1 file changed, 11 insertions(+), 19 deletions(-)
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diff --git a/libglusterfs/src/mem-pool.c b/libglusterfs/src/mem-pool.c
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index 2b41c01..73503e0 100644
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--- a/libglusterfs/src/mem-pool.c
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+++ b/libglusterfs/src/mem-pool.c
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@@ -541,25 +541,17 @@ mem_pools_preinit(void)
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static __attribute__((destructor)) void
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mem_pools_postfini(void)
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{
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- per_thread_pool_list_t *pool_list, *next;
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-
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- /* This is part of a process shutdown (or dlclose()) which means that
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- * most probably all threads should be stopped. However this is not the
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- * case for gluster and there are even legitimate situations in which we
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- * could have some threads alive. What is sure is that none of those
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- * threads should be using anything from this library, so destroying
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- * everything here should be fine and safe. */
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-
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- list_for_each_entry_safe(pool_list, next, &pool_threads, thr_list)
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- {
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- mem_pool_thread_destructor(pool_list);
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- }
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-
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- list_for_each_entry_safe(pool_list, next, &pool_free_threads, thr_list)
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- {
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- list_del(&pool_list->thr_list);
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- FREE(pool_list);
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- }
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+ /* TODO: This function should destroy all per thread memory pools that
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+ * are still alive, but this is not possible right now because glibc
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+ * starts calling destructors as soon as exit() is called, and
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+ * gluster doesn't ensure that all threads have been stopped before
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+ * calling exit(). Existing threads would crash when they try to use
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+ * memory or they terminate if we destroy things here.
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+ *
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+ * When we propertly terminate all threads, we can add the needed
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+ * code here. Till then we need to leave the memory allocated. Most
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+ * probably this function will be executed on process termination,
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+ * so the memory will be released anyway by the system. */
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}
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/* Call mem_pools_init() once threading has been configured completely. This
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--
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1.8.3.1
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