Hi Dave, Alex, Debugging using trace, crash and systemtap, I found that the hang happens when xfs_sync_worker() (thru kworker) gets stuck in xlog_wait() while reserving a transaction log buffer for the dummy log. I also found that even though xfsaild_push() keeps getting invoked, it doesn't do anything to push the log to the disk, since the ailp->xa_target has not been changed since it has been called from the process stack a while back. So, I thought, resetting the target to the max value would help nudge the flow of ail to the disk. So, I added the following code. ------------------ diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c index ed9252b..f59fd9f 100644 --- a/fs/xfs/xfs_trans_ail.c +++ b/fs/xfs/xfs_trans_ail.c @@ -534,6 +534,10 @@ out_done: ailp->xa_last_pushed_lsn = 0; } + lsn = xfs_ail_max_lsn(ailp); + smp_wmb(); + xfs_trans_ail_copy_lsn(ailp, &ailp->xa_target, &lsn); + smp_wmb(); return tout; } -------------------- and it seem to do the magic. With this change, test 234 runs fine. Is this a good fix, bad fix, overkill... ? Please let me know. regards chandra _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
