On 4 July 2012 13:19, Liu Bo [off-list ref] wrote:

On 07/04/2012 11:37 AM, Daniel J Blueman wrote:

quoted

quoted

Hi everyone,

I've got a nice set of fixes from Josef, Jan, Ilya and others in my
for-linus branch:

git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git for-linus

Some of the changes are fixes for the tree logging code, so I ran some
extra crash runs against them Friday night.

I ended up with a new crash in the tree log directory deletion replay
code, so I didn't send out the pull request to Linus.

It isn't clear yet if the new crash is because I was testing differently
or if it is a regression.  I'm nailing it down this weekend, but please
give my for-linus a shot.

I consistently run into this assertion [1] while running a fio
workload on a fresh RAID10 filesystem with a balance running.

Let me know if you need steps to reproduce, debug etc.

Seems that additional condition does not catch the bug.

Plz show us the steps to reproduce, I'll try to reproduce it locally and nail it down.

The reproducer auto-generated from my test [1] consistently hits the
spot here; config @ http://quora.org/2012/kconfig-btrfs . You'll need
the fio workload file [2] in the same dir.

Thanks,
  Daniel

--- [1]

#!/bin/bash -ex

modprobe brd rd_size=1572864 rd_nr=4
# or use kernel param: ramdisk_size=1572864
mkdir -p /tmp/btrfsathon
sync

mkfs.btrfs -m raid1 -d raid1 -l 4096 -n 4096 /dev/ram2 /dev/ram3 /dev/ram1
mount /dev/ram1 /tmp/btrfsathon -o nodatacow,autodefrag,ssd,flushoncommit
btrfs filesystem defragment /tmp/btrfsathon ||: & sleep 0.017
fio --timeout=60 ./workload ||: & sleep 0.000
btrfs filesystem defragment /tmp/btrfsathon ||: & sleep 0.012
btrfs filesystem defragment /tmp/btrfsathon ||: & sleep 0.010
btrfs filesystem defragment /tmp/btrfsathon ||: & sleep 0.003
btrfs filesystem defragment /tmp/btrfsathon ||: & sleep 0.003
btrfs filesystem balance /tmp/btrfsathon ||: & sleep 0.003
fio --timeout=60 ./workload ||: & sleep 0.000
wait
umount /tmp/btrfsathon

--- [2] 'workload'

[global]
directory=/tmp/btrfsathon
rw=randread
size=128m
ioengine=libaio
iodepth=32
invalidate=1
direct=1

[bgwriter]
rw=randwrite
iodepth=32

[queryA]
iodepth=2
ioengine=mmap
direct=0
thinktime=1

[queryB]
iodepth=2
ioengine=mmap
direct=0
thinktime=1

[bgupdater]
rw=randrw
iodepth=32
size=64m
-- 
Daniel J Blueman