[Btrfs-devel] OOPs on ppc/2.6.20-16-powerpc ?

[Yan Zheng]

2008/3/2, Miguel Figueiredo Mascarenhas Sousa Filipe <miguel.filipe at gmail.com>:
> I'm playing with btrfs-unstable (hg tip reports: e4cd88595ed7) on ppc,
>  and I've caught this on dmesg...:
>
>  [71240.543144] ------------[ cut here ]------------
>  [71240.543157] Badness at /home/miguel/code/btrfs-unstable/extent-tree.c:1293
>  [71240.543164] Call Trace:
>  [71240.543169] [D047F9A0] [C0008BB0] show_stack+0x3c/0x194 (unreliable)
>  [71240.543200] [D047F9D0] [C01103E4] report_bug+0x84/0xf4
>  [71240.543217] [D047F9E0] [C0011ED4] program_check_exception+0xd4/0x520
>  [71240.543238] [D047FA30] [C0013B4C] ret_from_except_full+0x0/0x4c
>  [71240.543250] --- Exception: 700 at __free_extent+0x618/0x69c [btrfs]
>  [71240.543371]     LR = __free_extent+0x618/0x69c [btrfs]
>  [71240.543377] [D047FBA0] [EAA16BF4] btrfs_free_extent+0xcc/0x158 [btrfs]
>  [71240.543398] [D047FBF0] [EAA05D44] __btrfs_cow_block+0x1358/0x1428 [btrfs]
>  [71240.543419] [D047FC80] [EAA05FC4] btrfs_cow_block+0x1b0/0x2c0 [btrfs]
>  [71240.543438] [D047FCC0] [EAA10C68] btrfs_search_slot+0x165c/0x2844 [btrfs]
>  [71240.543459] [D047FDD0] [EAA11EE8] btrfs_insert_empty_items+0x98/0x91c [btrfs]
>  [71240.543479] [D047FE40] [EAA127C4] btrfs_insert_item+0x58/0xc0 [btrfs]
>  [71240.543499] [D047FE70] [EAA1E9E8] btrfs_insert_root+0x14/0x24 [btrfs]
>  [71240.543520] [D047FE80] [EAA262C0] add_dirty_roots+0x24c/0x434 [btrfs]
>  [71240.543543] [D047FEF0] [EAA26708]
>  btrfs_commit_transaction+0x260/0x658 [btrfs]
>  [71240.543565] [D047FF40] [EAA26BC8] btrfs_transaction_cleaner+0xc8/0xf8 [btrfs]
>  [71240.543587] [D047FF50] [C0042408] run_workqueue+0xb4/0x174
>  [71240.543611] [D047FF70] [C0042D0C] worker_thread+0x150/0x17c
>  [71240.543620] [D047FFC0] [C0046968] kthread+0xc0/0xfc
>  [71240.543633] [D047FFF0] [C0014434] kernel_thread+0x44/0x60
>  [71240.543661] Unable to find ref byte nr 36864 root 1  gen 0 owner 0 offset 0
>  [72207.530342] btrfs: dm-5 checksum verify failed on 4116480 wanted
>  46D4996A found 1E2B503D from_this_trans 0
>  [72260.415833] btrfs: dm-5 checksum verify failed on 4411392 wanted
>  D681AA75 found 46BD8FEE from_this_trans 0
>  [72263.184305] btrfs: dm-5 checksum verify failed on 4427776 wanted
>  7735BEE8 found 759BDF50 from_this_trans 0
>  [72266.003313] btrfs: dm-5 checksum verify failed on 4444160 wanted
>  AC8E3D13 found F36AA813 from_this_trans 0
>  [72269.549965] btrfs: dm-5 checksum verify failed on 4476928 wanted
>  5BA0B00D found 41B349C8 from_this_trans 0
>
>  the checksum errors don't seem endianess problems...
>

The warning at extent-tree.c:1293 is due to a endian problem in
btrfs-progs v0.13. you can use btrfs-progs v0.12 to create the
filesystem.

The checksum verify failed message is due to a race.
http://oss.oracle.com/pipermail/btrfs-users/2008-January/000032.html

Regards
YZ