3.11.0-rc3+
------------------
[ 225.586356] kernel BUG at fs/btrfs/relocation.c:886!
[ 225.586362] invalid opcode: 0000 [#1] SMP
::
[ 225.586431] Call Trace:
[ 225.586440] [<ffffffffa0055cd1>] ?
btree_read_extent_buffer_pages.clone.4+0xd1/0x120 [btrfs]
[ 225.586447] [<ffffffffa00a9123>] relocate_tree_blocks+0x363/0x6d0
[btrfs]
[ 225.586454] [<ffffffffa00a242c>] ? tree_insert+0x4c/0x60 [btrfs]
[ 225.586461] [<ffffffffa00a97b3>] relocate_block_group+0x323/0x640
[btrfs]
[ 225.586469] [<ffffffffa00aa14f>]
btrfs_relocate_block_group+0x19f/0x2c0 [btrfs]
[ 225.586477] [<ffffffffa0081768>] btrfs_relocate_chunk+0x88/0x770 [btrfs]
[ 225.586485] [<ffffffffa0076211>] ? read_extent_buffer+0xb1/0x110 [btrfs]
[ 225.586493] [<ffffffffa00724bf>] ? btrfs_get_token_64+0x5f/0xf0 [btrfs]
[ 225.586500] [<ffffffffa0082c51>] btrfs_balance+0x891/0xe40 [btrfs]
[ 225.586508] [<ffffffffa008c3ff>] ? kzalloc+0xf/0x20 [btrfs]
[ 225.586552] [<ffffffff8113d445>] ? __kmalloc+0xf5/0x170
[ 225.586560] [<ffffffffa008cfca>] btrfs_ioctl_balance+0x21a/0x330 [btrfs]
[ 225.586568] [<ffffffffa008fd95>] btrfs_ioctl+0x585/0x1660 [btrfs]
[ 225.586575] [<ffffffff8111d9eb>] ? handle_mm_fault+0x12b/0x230
[ 225.586590] [<ffffffff811556d4>] do_vfs_ioctl+0x84/0x4c0
[ 225.586616] [<ffffffff812867cd>] ? inode_has_perm.clone.0+0x2d/0x30
[ 225.586618] [<ffffffff8128891a>] ? file_has_perm+0x8a/0xa0
[ 225.586625] [<ffffffff8114ec71>] ? final_putname+0x21/0x50
[ 225.586627] [<ffffffff81155ba1>] SyS_ioctl+0x91/0xa0
[ 225.586670] [<ffffffff8181fed2>] system_call_fastpath+0x16/0x1b
-------------------
if (btrfs_root_level(&root->root_item) == cur->level) {
/* tree root */
BUG_ON(btrfs_root_bytenr(&root->root_item) !=
cur->bytenr);
if (should_ignore_root(root))
list_add(&cur->list, &useless);
else
cur->root = root;
break;
}
reproducer:
---------------------
# mkfs.btrfs /dev/sdb -f
# btrfsck --init-csum /dev/sdb
Creating a new CRC tree
Checking filesystem on /dev/sdb
UUID: 51576f7d-af1d-458b-b3c5-02eda4b3c39f
checking extents
Reinit crc root
found 0 bytes used err is 0
total csum bytes: 0
total tree bytes: 0
total fs tree bytes: 0
total extent tree bytes: 0
btree space waste bytes: 0
file data blocks allocated: 0
referenced 0
Btrfs v0.20-rc1-413-g3f4deb0-dirty
# mount /dev/sdb /btrfs
# btrfs fi bal /btrfs
Segmentation fault
#
---------------------
Any idea how do we fix this ?
( other than don't run --init-csum :-) )
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