svn commit: r322227 - vendor-sys/illumos/dist/uts/common/fs/zfs

[Andriy Gapon]

Author: avg
Date: Tue Aug  8 10:47:56 2017
New Revision: 322227
URL: https://svnweb.freebsd.org/changeset/base/322227

Log:
  8377 Panic in bookmark deletion
  
  illumos/illumos-gate at 42418f9e73f0d007aa87675ecc206c26fc8e073e
  https://github.com/illumos/illumos-gate/commit/42418f9e73f0d007aa87675ecc206c26fc8e073e
  
  https://www.illumos.org/issues/8377
    The problem is that when dsl_bookmark_destroy_check() is executed from open
    context (the pre-check), it fills in dbda_success based on the existence of the
    bookmark.
    But the bookmark (or containing filesystem as in this case) can be destroyed
    before we get to syncing context. When we re-run dsl_bookmark_destroy_check()
    in syncing
    context, it will not add the deleted bookmark to dbda_success, intending for
    dsl_bookmark_destroy_sync() to not process it. But because the bookmark is
    still in dbda_success
    from the open-context call, we do try to destroy it.
    The fix is that dsl_bookmark_destroy_check() should not modify dbda_success
    when called from open context.
  
  Reviewed by: Paul Dagnelie <pcd at delphix.com>
  Reviewed by: Pavel Zakharov <pavel.zakharov at delphix.com>
  Reviewed by: George Wilson <george.wilson at delphix.com>
  Approved by: Robert Mustacchi <rm at joyent.com>
  Author: Matthew Ahrens <mahrens at delphix.com>

Modified:
  vendor-sys/illumos/dist/uts/common/fs/zfs/dsl_bookmark.c

Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dsl_bookmark.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/dsl_bookmark.c	Tue Aug  8 10:46:51 2017	(r322226)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/dsl_bookmark.c	Tue Aug  8 10:47:56 2017	(r322227)
@@ -354,6 +354,9 @@ dsl_bookmark_destroy_check(void *arg, dmu_tx_t *tx)
 	dsl_pool_t *dp = dmu_tx_pool(tx);
 	int rv = 0;
 
+	ASSERT(nvlist_empty(dbda->dbda_success));
+	ASSERT(nvlist_empty(dbda->dbda_errors));
+
 	if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARKS))
 		return (0);
 
@@ -383,7 +386,10 @@ dsl_bookmark_destroy_check(void *arg, dmu_tx_t *tx)
 			}
 		}
 		if (error == 0) {
-			fnvlist_add_boolean(dbda->dbda_success, fullname);
+			if (dmu_tx_is_syncing(tx)) {
+				fnvlist_add_boolean(dbda->dbda_success,
+				    fullname);
+			}
 		} else {
 			fnvlist_add_int32(dbda->dbda_errors, fullname, error);
 			rv = error;