I've been experiencing repetitive "kernel BUG" occurences in the past
few days trying to balance a raid5 filesystem after adding a new drive.
It occurs on both 4.2.0 and 4.1.7, using 4.2 userspace tools.
I've ran a scrub on this filesystem after the crash happened twice, and
if found no errors.
The BUG_ON() condition that my filesystem triggers is the following :
BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID);
// in insert_inline_extent_backref() of extent-tree.c.
I've compiled a fresh 4.3.0-rc1 with a couple added printk's just before
the BUG_ON(), to dump the parameters passed to
insert_inline_extent_backref() when the problem occurs.
Here is an excerpt of the resulting dmesg :
{btrfs} in insert_inline_extent_backref, got owner <
BTRFS_FIRST_FREE_OBJECTID
{btrfs} with bytenr=4557830635520 num_bytes=16384 parent=4558111506432
root_objectid=3339 owner=1 offset=0 refs_to_add=1
BTRFS_FIRST_FREE_OBJECTID=256
------------[ cut here ]------------
kernel BUG at fs/btrfs/extent-tree.c:1837!
I'll retry with the exact same kernel once I get the machine back up,
and see if the the bug happens again at the same filesystem spot or a
different one.
The variable amount of time after a balance start elapsed before I get
the bug suggests that this would be a different one.
--
Stéphane.
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