On 2015/10/21 20:27, David Sterba wrote:
On Wed, Oct 21, 2015 at 04:20:00PM +0900, Tsutomu Itoh wrote:
Kernel panic occurred due to NULL pointer reference in can_overcommit().
Because btrfs_async_reclaim_metadata_space() passed NULL pointer to
btrfs_calc_reclaim_metadata_size().
fs_info->fs_root is referred in btrfs_async_reclaim_metadata_space()
when mount kicked kworker(btrfs_async_reclaim_metadata_space).
But at this time, fs_info->fs_root had not been initialized yet,
so NULL pointer passed to btrfs_calc_reclaim_metadata_size().
I don't think it's the right fix, the initialization sequence should
take care of such situations. The fs_tree must exist at the time we
reach the point where it crashed, the code expects it.
OK. I will try to change initialization sequence.
Thanks,
Tsutomu
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