Re: btrfs BUG() & panic in __btrfs_reserve_extent(), 2.6.30-rc6

[Mason <chris.mason@oracle.com>]

On Sun, May 24, 2009 at 01:47:30PM +0300, Denys Fedoryschenko wrote:
> Hardware: 2x Core 2 Quad Xeon, RAM 8GB, 9 HDD
> Arch: x86_64
> Distro: custom, almost embedded
> Kernel: 2.6.30-rc6-git6-build-0045-64bit
> 
> netconsole crash information: http://www.nuclearcat.com/files/btrfs-crash.txt

Josef, it looks like the tracking code is losing some bytes ;)  The
total bytes in the space info doesn't add up to the other numbers in
this data.  It is worth mentioning that he's doing nodatacow.

Definitely a btrfs bug, so we can trim ext4 off the list from now on,
full quote below for Josef.

-chris

> 
> df information:
> Proxy-Karam-Main /config # df -h
> Filesystem                Size      Used Available Use% Mounted on
> /dev/mapper/root          3.6G    107.1M      3.4G   3% /mnt/flash
> /dev/loop0                4.9M      4.9M         0 
> 100% /lib/modules/2.6.30-rc6-git6-build-0045-64bit
> /dev/sdb2               118.9G     17.6G     95.2G  16% /cache2
> /dev/sdc1               134.5G     17.6G    110.0G  14% /cache3
> /dev/sdd1               134.5G     17.6G    110.0G  14% /cache4
> /dev/sde1               134.5G     17.6G    110.0G  14% /cache5
> /dev/sdf1               134.5G     17.8G    109.9G  14% /cache6
> /dev/sdg1               134.5G     17.6G    110.0G  14% /cache7
> /dev/sdh1               134.5G     17.4G    110.2G  14% /cache8
> /dev/sdb1                15.8G      9.4G      6.5G  59% /cache9
> /dev/sda1                15.8G      9.4G      6.5G  59% /cache10
> 
> Proxy-Karam-Main /config # df -i
> Filesystem              Inodes      Used Available Use% Mounted on
> /dev/mapper/root        243360        36    243324   0% /mnt/flash
> /dev/loop0                 840       840         0 
> 100% /lib/modules/2.6.30-rc6-git6-build-0045-64bit
> /dev/sdb2              7921664     38420   7883244   0% /cache2
> /dev/sdc1              8953856     39806   8914050   0% /cache3
> /dev/sdd1              8953856     38571   8915285   0% /cache4
> /dev/sde1              8953856     38829   8915027   0% /cache5
> /dev/sdf1              8953856     50827   8903029   1% /cache6
> /dev/sdg1              8953856     41111   8912745   0% /cache7
> /dev/sdh1              8953856     28609   8925247   0% /cache8
> /dev/sdb1                    0         0         0   0% /cache9
> /dev/sda1                    0         0         0   0% /cache10
> 
> /proc/mounts
> Proxy-Karam-Main /config # cat /proc/mounts
> rootfs / rootfs rw 0 0
> proc /proc proc rw,relatime 0 0
> sysfs /sys sysfs rw,relatime 0 0
> none /dev/pts devpts rw,relatime,mode=600 0 0
> none /proc/bus/usb usbfs rw,relatime 0 0
> /dev/mapper/root /mnt/flash ext3 rw,noatime,errors=continue,data=writeback 0 0
> /dev/loop0 /lib/modules/2.6.30-rc6-git6-build-0045-64bit squashfs ro,relatime 
> 0 0
> /dev/sdb2 /cache2 ext4 
> rw,noatime,nodiratime,commit=60,barrier=1,journal_async_commit,data=writeback 
> 0 0
> /dev/sdc1 /cache3 ext4 
> rw,noatime,nodiratime,commit=60,barrier=1,journal_async_commit,data=writeback 
> 0 0
> /dev/sdd1 /cache4 ext4 
> rw,noatime,nodiratime,commit=60,barrier=1,journal_async_commit,data=writeback 
> 0 0
> /dev/sde1 /cache5 ext4 
> rw,noatime,nodiratime,commit=60,barrier=1,journal_async_commit,data=writeback 
> 0 0
> /dev/sdf1 /cache6 ext4 
> rw,noatime,nodiratime,commit=60,barrier=1,journal_async_commit,data=writeback 
> 0 0
> /dev/sdg1 /cache7 ext4 
> rw,noatime,nodiratime,commit=60,barrier=1,journal_async_commit,data=writeback 
> 0 0
> /dev/sdh1 /cache8 ext4 
> rw,noatime,nodiratime,commit=60,barrier=1,journal_async_commit,data=writeback 
> 0 0
> /dev/sdb1 /cache9 btrfs rw,relatime,nodatasum,nodatacow,nobarrier,noacl 0 0
> /dev/sda1 /cache10 btrfs rw,relatime,nodatasum,nodatacow,nobarrier,noacl 0 0
> 
> btrfs-show
> Label: CACHE10  uuid: de61670d-5e6a-40f1-8712-aaa4bf3df719
>         Total devices 1 FS bytes used 9.36GB
>         devid    1 size 15.83GB used 15.83GB path /dev/sda1
> 
> Label: CACHE9  uuid: a293c4d3-31d6-427e-9cbf-5e5fbaf8871e
>         Total devices 1 FS bytes used 9.37GB
>         devid    1 size 15.83GB used 15.83GB path /dev/sdb1
> 
>