> > [ 282.380849] ------------[ cut here ]------------
> > [ 282.380865] WARNING: at fs/inode.c:1315 iput+0x20b/0x210()
> > [ 282.380869] Hardware name: HP Compaq 2510p Notebook PC
> > [ 282.380873] Modules linked in: ext2 loop kvm_intel kvm fuse scsi_wait_scan usb_storage tun i915 drm_kms_helper drm yenta_socket sdhci_pci sdhci snd_hda_codec_analog iwl4965 mmc_core i2c_algo_bit pcmcia_core thermal container ac button fan battery e1000e iwl_legacy mac80211 snd_hda_intel cfg80211 snd_hda_codec pcmcia_rsrc processor rfkill snd_hwdep
> > [ 282.380932] Pid: 715, comm: btrfs-cleaner Not tainted 3.1.0-rc3-00203-gdbf2e46 #139
> > [ 282.380936] Call Trace:
> > [ 282.380947] [<ffffffff8103e7ba>] warn_slowpath_common+0x7a/0xb0
> > [ 282.380954] [<ffffffff8103e805>] warn_slowpath_null+0x15/0x20
> > [ 282.380960] [<ffffffff810eafbb>] iput+0x20b/0x210
> > [ 282.380967] [<ffffffff811b990b>] btrfs_iget+0x1eb/0x4a0
> > [ 282.380975] [<ffffffff811c3ce6>] btrfs_run_defrag_inodes+0x136/0x210
> > [ 282.380982] [<ffffffff811ad76f>] cleaner_kthread+0x17f/0x1a0
> > [ 282.380988] [<ffffffff81035b7d>] ? sub_preempt_count+0x9d/0xd0
> > [ 282.380994] [<ffffffff811ad5f0>] ? transaction_kthread+0x280/0x280
> > [ 282.381001] [<ffffffff8105b056>] kthread+0x96/0xa0
> > [ 282.381027] [<ffffffff81433914>] kernel_thread_helper+0x4/0x10
> > [ 282.381034] [<ffffffff8105afc0>] ? kthread_worker_fn+0x190/0x190
> > [ 282.381039] [<ffffffff81433910>] ? gs_change+0xb/0xb
> > [ 282.381044] ---[ end trace 40720e359a3c0fea ]---
>
> Konstantin's patch
>
> [PATCH] btrfs: fix warning in iput for bad-inode
>
> fixed the issue.
Actually, not quite. Busy spin popped up as described in:
http://www.spinics.net/lists/linux-btrfs/msg12156.html
--
Sergei
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