Bug#908382: Update on kernel bug: kernel 4.18 fails to boot

[Jiri Palecek <jpalecek@web.de>]

Hello,

just for an update on this bug, I finally did the bisecting and found 
the first offending commit is this:

commit 21e07dba9fb1179148089d611fc9e6e70d1887c3 (HEAD, refs/bisect/bad)
Author: Christoph Hellwig <hch@lst.de>
Date:   Tue Apr 3 19:09:59 2018 +0200

    scsi: reduce use of block bounce buffers

    We can rely on the dma-mapping code to handle any DMA limits that is
    bigger than the ISA DMA mask for us (either using an iommu or swiotlb),
    so remove setting the block layer bounce limit for anything but the
    unchecked_isa_dma case, or the bouncing for highmem pages.

    Signed-off-by: Christoph Hellwig <hch@lst.de>
    Reviewed-by: Jens Axboe <axboe@kernel.dk>

Apparently the system with 5G memory needs bounce buffers after all, and 
without iommu, the swiotlb thingy didn't quite make it. Init then 
crashes after unsuccessful read of the disk.

Regards

    Jiri Palecek