[spruce-project] [PATCH 0/2] ext4: deadlocks after allocation failure in ext4_init_io_end()

[Zheng Liu]

On Mon, May 13, 2013 at 11:08:11PM +0400, Alexey Khoroshilov wrote:
> Hi, Ted!
> 
> Our tests for ext4 with targeted fault injection were stalled in Uninterruptible Sleep State 
> when they simulate a memory allocation failure in ext4_init_io_end() while it is called from 
> mpage_da_submit_io() or ext4_writepage().
> 
> It looks like the problems are that pages left locked after failure handling.
> 
> I am not completely sure that my patches take into account all required aspects, 
> but the tests are passed if the patches are applied.
> 
> Please find below syslog excerpt for the first issue.
> 
> Found by Linux File System Verification project (linuxtesting.org/spruce). 

Hi Alexey,

Thanks for fixing this.  The patch series looks good to me.  But the
commit (ext4: use io_end for multiple bios) has been reverted in dev
branch of ext4 tree.  I forward the mail to Jan to let him know your
fixes.

Regards,
                                                - Zheng