[Btrfs-users] Requirements for btrfs

[Otto Muller]

Hi,

i've just tested btrfs-0.10. 
when i copyed my portage on btrfs volume, a have such
bug:

------------[ cut here ]------------
kernel BUG at
/home/muller/btrfs/btrfs-0.10/extent-tree.c:1651!
invalid opcode: 0000 [#1] PREEMPT SMP
Modules linked in: btrfs xt_mac xt_limit xt_multiport
ipt_owner ipaq usbserial nvidia(P)

Pid: 23376, comm: btrfs/0 Tainted: P       
(2.6.24-rc8-fly #1)
EIP: 0060:[<f8d32c37>] EFLAGS: 00010286 CPU: 0
EIP is at btrfs_alloc_extent+0x447/0x450 [btrfs]
EAX: ffffffe4 EBX: dd41a758 ECX: c201179c EDX:
00000000
ESI: f5f93d50 EDI: ffffffe4 EBP: 00000000 ESP:
f7a91ce8
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
Process btrfs/0 (pid: 23376, ti=f7a90000 task=d8be9170
task.ti=f7a90000)
Stack: 00004000 00000000 00040000 00000000 00000000
00000000 ffffffff ffffffff
       1f3f9000 00000000 f7a91d9b 00000000 00000000
00000000 00000000 00000002
       de36da00 dd41a758 de0d5e00 00000001 00004000
00000000 00004000 de36da00
Call Trace:
 [<f8d32cfa>] __btrfs_alloc_free_block+0xba/0x290
[btrfs]
 [<f8d29984>] __btrfs_cow_block+0x174/0x600 [btrfs]
 [<f8d2b58c>] btrfs_realloc_node+0x2cc/0x4f0 [btrfs]
 [<f8d42952>] btrfs_defrag_leaves+0x612/0x960 [btrfs]
 [<f8d39649>] btrfs_start_transaction+0xc9/0x1e0
[btrfs]
 [<f8d3a618>] btrfs_defrag_root+0x68/0xe0 [btrfs]
 [<f8d3a703>] btrfs_defrag_dirty_roots+0x73/0x80
[btrfs]
 [<f8d3a710>] btrfs_transaction_cleaner+0x0/0xd0
[btrfs]
 [<f8d3a7b2>] btrfs_transaction_cleaner+0xa2/0xd0
[btrfs]
 [<c013c3ba>] run_workqueue+0x7a/0x100
 [<c0140230>] autoremove_wake_function+0x0/0x50
 [<c013ce7c>] worker_thread+0x9c/0x100
 [<c0140230>] autoremove_wake_function+0x0/0x50
 [<c013cde0>] worker_thread+0x0/0x100
 [<c013ff52>] kthread+0x42/0x70
 [<c013ff10>] kthread+0x0/0x70
 [<c0104faf>] kernel_thread_helper+0x7/0x18
 =======================
Code: 44 24 0c b8 6e 06 00 00 89 44 24 08 b8 2c 07 d5
f8 89 44 24 04 c7 04 24 8d f9 d4 f8 e8 f3 97 3f c7 e8
ae 3a 3d c7 e9 35 fc ff ff <0f> 0b eb fe 90 8d 74 26
00 55 89 d5 57 89 cf 56 31 f6 53 89 cb
EIP: [<f8d32c37>] btrfs_alloc_extent+0x447/0x450
[btrfs] SS:ESP 0068:f7a91ce8
---[ end trace eceaeca47ca890e4 ]---

i allready figured out that minimal filesystem size is
256mb, and i noticed that btrfs can crash if
filesystem is "full". 
my filesystem is 500mb large, and after crash it still
have 15mb free :)

is it such "full" to crash? and what are current
required minimal free size for "stable" work?

and btw, are such reports about crashes needed? or on
this stage of development this is odd?

--
wbr,
sergey


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