Hi,
On Mon, May 30, 2011 at 01:33:21PM -0400, James Cloos wrote:
> The BUG_ON() call is from:
>
> if (!BTRFS_I(inode)->orphan_meta_reserved) {
> BTRFS_I(inode)->orphan_meta_reserved = 1;
> reserve = 1;
> }
> /* *ELIDED* */
> /* grab metadata reservation from transaction handle */
> if (reserve) {
> ret = btrfs_orphan_reserve_metadata(trans, inode);
> BUG_ON(ret);
ret == -ENOSPC
> }
>
> and I cannot umount(8) that fs since this. It claims to be in use.
system is in undefined state after hitting a BUG_ON, there may be locked
spinlocks/mutexes, held references, etc, causing hangs eg. during sync.
> A du(1) gets stuck but remains interuptable and quits cleanly when
> signaled.
one can have a look at /proc/<pid>/stack where the process is stuck, and
what locks are being held, probably with TASK_INTERRUPTIBLE. but this
will not help anyhow.
> ------------[ cut here ]------------
> kernel BUG at fs/btrfs/inode.c:2260!
> invalid opcode: 0000 [#1] PREEMPT SMP
> CPU 1
> Modules linked in: k10temp
>
> Pid: 1343, comm: g-common Not tainted 2.6.39-07159-gf23a5e1 #57 MSI MS-7642/890GXM-G65 (MS-7642)
> RIP: 0010:[<ffffffff8124144d>] [<ffffffff8124144d>] btrfs_orphan_add+0xfa/0x13c
> RSP: 0018:ffff88001a51bdd8 EFLAGS: 00010286
> RAX: 00000000ffffffe4 RBX: ffff8802fb8e9000 RCX: ffff8802bd624530
^^^^^^^^^^^^^^^^
confirmed, -ENOSPC == -28
david
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