Re: [PATCH] ext4: fix BUG_ON in fs/ext4/page_io.c:ext4_release_io_end()

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On Mon, Apr 13, 2020 at 10:28:42PM -0400, Theodore Ts'o wrote:
> The function ext4_release_io_end() can be called by
> ext4_put_io_end_defer() with the EXT4_IO_UNWRITTEN flag set and
> io_end->size is 0.  In that case, it's safe to release the io_end
> structure, since if io_end->size is zero, there is no unwritten region
> to release.
> 
> This can be reproduced using generic/300, although not very reliably,
> and almost never using a freshly rebooted kernel.
> 
> Google-Bug-Id: 15054006
> Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>

NACK; this patch no longer applies given the move to use iomap for direct I/O.

      	   	    	   	   	 - Ted



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