lockless truncate is suspected to cause bug 23175. Disable it by
default for now to see if the problem happens again.
/* default value for ll_sb_info->contention_time */
#define SBI_DEFAULT_CONTENTION_SECONDS 60
/* default value for lockless_truncate_enable */
/* default value for ll_sb_info->contention_time */
#define SBI_DEFAULT_CONTENTION_SECONDS 60
/* default value for lockless_truncate_enable */
-#define SBI_DEFAULT_LOCKLESS_TRUNCATE_ENABLE 1
+#define SBI_DEFAULT_LOCKLESS_TRUNCATE_ENABLE 0 /* see bug 23175 */
/* default value for ll_direct_io_default */
#define SBI_DEFAULT_DIRECT_IO_DEFAULT 0
/* default value for ll_direct_io_default */
#define SBI_DEFAULT_DIRECT_IO_DEFAULT 0