On Wed, May 08, 2019 at 02:04:03PM +0530, Sahitya Tummala wrote:
> The buffer_head (frames[0].bh) and it's corresping page can be
> potentially free'd once brelse() is done inside the for loop
> but before the for loop exits in dx_release(). It can be free'd
> in another context, when the page cache is flushed via
> drop_caches_sysctl_handler(). This results into below data abort
> when accessing info->indirect_levels in dx_release().
>
> Unable to handle kernel paging request at virtual address ffffffc17ac3e01e
> Call trace:
> dx_release+0x70/0x90
> ext4_htree_fill_tree+0x2d4/0x300
> ext4_readdir+0x244/0x6f8
> iterate_dir+0xbc/0x160
> SyS_getdents64+0x94/0x174
>
> Signed-off-by: Sahitya Tummala <stumm...@codeaurora.org>
Nice catch. Thanks, applied.
- Ted
