Hi liubo, On Wed, October 17, 2012 at 17:27 (+0200), Liu Bo wrote: > Hi Jan, > > Here is the steps, > > 1. apply the three patches onto the latest btrfs
Can you give me a commit id? They don't apply to cmason/master as of today. Patch 1 looks reversed, by the way. I'd comment on patch 2, but it's hard to comment on something in a tar archive. You probably wanted to add "add++" where you added "add = 0" for the second time. > 2. run the script 'debug.sh'[1] > (NOTE: edit the script and the fio job file[2] to get device and mount > point right before running it) > > 3. it will crash after a few seconds. [3] > > > thanks, > liubo > > > [1]: > $ cat debug.sh > #!/bin/bash > > D=/dev/sda5 > M=/mnt/btrfs > > umount $M $D > mkfs.btrfs $D > > mount $D $M -o autodefrag > > fio fio_sync_random_write_4k_config & > > for ((i=0; i<20; i++)) > do > btrfs sub snap $M $M/s_$i > sleep 2 > done & > > [2] > $ cat fio_sync_random_write_4k_config > [global] > direct=0 > ioengine=sync > size=800M > bs=4k > numjobs=1 > group_reporting > invalidate=0 > end_fsync=1 > overwrite=0 > directory=/mnt/btrfs > > > [job_sub0] > startdelay=0 > rw=randwrite > filename=foo > > [3] > [ 71.980881] device fsid bc47c36a-7e90-453d-aa6b-8c4a12e30dc0 devid 1 > transid 4 /dev/sda5 > [ 71.984162] btrfs: enabling auto defrag > [ 71.984168] btrfs: disk space caching is enabled > [ 72.051464] root last_snapshot 5 > [ 95.789404] root last_snapshot 6 > [ 100.229357] root last_snapshot 7 > [ 103.252999] record_old_file_extents: ino 257 new file_pos 38273024 len > 1048576 bytenr 2387300352 disk_len 1048576 > [ 103.255989] record_extent_backrefs file_pos 38273024 len 1048576 > [ 103.348648] eb->start 66080768 eb->len 4096 eb->level 1 nritems 66 n 176 > rm 110 add 0 Even the first line tells us there's something wrong. n shouldn't exceed 124 with 4k leaves. If you lower the debug output restriction (n > 130) we might already see through here. A guess is that we've probably queued some MOD_LOG_MOVE_KEYS operations that should have modified n. Thanks, -Jan -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
