File bug-1164718_14-lvmcache-remove-unused_duplicate_devs-list-from-cmd.patch of Package lvm2.18094
From c31e6b0acad339ec3cdc0c8d7e0e01f8d816ed10 Mon Sep 17 00:00:00 2001
From: David Teigland <teigland@redhat.com>
Date: Thu, 6 Jun 2019 14:12:19 -0500
Subject: [PATCH] lvmcache: remove unused_duplicate_devs list from cmd
Save the previous duplicate PVs in a global list instead
of a list on the cmd struct. dmeventd reuses the cmd struct
for multiple commands, and the list entries between commands
were being freed (apparently), causing a segfault in dmeventd
when it tried to use items in cmd->unused_duplicate_devs
that had been saved there by the previous command.
---
lib/cache/lvmcache.c | 16 +++++++++-------
lib/commands/toolcontext.c | 2 --
lib/commands/toolcontext.h | 1 -
3 files changed, 9 insertions(+), 10 deletions(-)
diff --git a/lib/cache/lvmcache.c b/lib/cache/lvmcache.c
index ad40d4c..0ce5df0 100644
--- a/lib/cache/lvmcache.c
+++ b/lib/cache/lvmcache.c
@@ -100,6 +100,7 @@ static struct dm_hash_table *_saved_vg_hash = NULL;
static DM_LIST_INIT(_vginfos);
static DM_LIST_INIT(_found_duplicate_devs);
static DM_LIST_INIT(_unused_duplicate_devs);
+static DM_LIST_INIT(_prev_unused_duplicate_devs);
static int _scanning_in_progress = 0;
static int _has_scanned = 0;
static int _vgs_locked = 0;
@@ -118,6 +119,7 @@ int lvmcache_init(struct cmd_context *cmd)
dm_list_init(&_vginfos);
dm_list_init(&_found_duplicate_devs);
dm_list_init(&_unused_duplicate_devs);
+ dm_list_init(&_prev_unused_duplicate_devs);
if (!(_vgname_hash = dm_hash_create(128)))
return 0;
@@ -1152,14 +1154,14 @@ next:
if (!prev_unchosen1 && !prev_unchosen2) {
/*
- * The cmd list saves the unchosen preference across
+ * The prev list saves the unchosen preference across
* lvmcache_destroy. Sometimes a single command will
* fill lvmcache, destroy it, and refill it, and we
* want the same duplicate preference to be preserved
* in each instance of lvmcache for a single command.
*/
- prev_unchosen1 = _dev_in_device_list(dev1, &cmd->unused_duplicate_devs);
- prev_unchosen2 = _dev_in_device_list(dev2, &cmd->unused_duplicate_devs);
+ prev_unchosen1 = _dev_in_device_list(dev1, &_prev_unused_duplicate_devs);
+ prev_unchosen2 = _dev_in_device_list(dev2, &_prev_unused_duplicate_devs);
}
dev1_major = MAJOR(dev1->dev);
@@ -2575,8 +2577,8 @@ void lvmcache_destroy(struct cmd_context *cmd, int retain_orphans, int reset)
dm_list_init(&_vginfos);
/*
- * Copy the current _unused_duplicate_devs into a cmd list before
- * destroying _unused_duplicate_devs.
+ * Move the current _unused_duplicate_devs to _prev_unused_duplicate_devs
+ * before destroying _unused_duplicate_devs.
*
* One command can init/populate/destroy lvmcache multiple times. Each
* time it will encounter duplicates and choose the preferrred devs.
@@ -2584,8 +2586,8 @@ void lvmcache_destroy(struct cmd_context *cmd, int retain_orphans, int reset)
* the unpreferred devs here so that _choose_preferred_devs can use
* this to make the same choice each time.
*/
- dm_list_init(&cmd->unused_duplicate_devs);
- lvmcache_get_unused_duplicate_devs(cmd, &cmd->unused_duplicate_devs);
+ _destroy_duplicate_device_list(&_prev_unused_duplicate_devs);
+ dm_list_splice(&_prev_unused_duplicate_devs, &_unused_duplicate_devs);
_destroy_duplicate_device_list(&_unused_duplicate_devs);
_destroy_duplicate_device_list(&_found_duplicate_devs); /* should be empty anyway */
_found_duplicate_pvs = 0;
diff --git a/lib/commands/toolcontext.c b/lib/commands/toolcontext.c
index 25e8b87..38e382f 100644
--- a/lib/commands/toolcontext.c
+++ b/lib/commands/toolcontext.c
@@ -1983,8 +1983,6 @@ struct cmd_context *create_toolcontext(unsigned is_clvmd,
if (!init_lvmcache_orphans(cmd))
goto_out;
- dm_list_init(&cmd->unused_duplicate_devs);
-
if (!_init_segtypes(cmd))
goto_out;
diff --git a/lib/commands/toolcontext.h b/lib/commands/toolcontext.h
index 485dca9..6e262e8 100644
--- a/lib/commands/toolcontext.h
+++ b/lib/commands/toolcontext.h
@@ -231,7 +231,6 @@ struct cmd_context {
const char *report_list_item_separator;
const char *time_format;
unsigned rand_seed;
- struct dm_list unused_duplicate_devs; /* save preferences between lvmcache instances */
};
/*
--
1.8.3.1