Re: block: oopses on 4.13.*, 4.14.* and 4.15-rc2 (bisected)

[Ming Lei]

On Sat, Dec 9, 2017 at 7:27 AM, Michele Ballabio
<barra_cuda@xxxxxxxxxxxx> wrote:
> On Fri, 8 Dec 2017 13:08:37 -0700
> Jens Axboe <axboe@xxxxxxxxx> wrote:
>
>> On 12/08/2017 08:38 AM, Michele Ballabio wrote:
>> > Hi,
>> >     kernels 4.13.*, 4.14.* 4.15-rc2 crash on occasion,
>> > especially on x86-32 systems. To trigger the problem, run as root:
>> >
>> > while true
>> > do
>> >         /sbin/udevadm trigger --type=subsystems --action=change
>> >         /sbin/udevadm trigger --type=devices --action=change
>> >         /sbin/udevadm settle --timeout=120
>> > done
>> >
>> > (Thanks to Patrick Volkerding for the reproducer).
>> >
>> > Sometimes the kernel oopses immediately, sometimes a bit later
>> > (less than five minutes).
>> >
>> > The bisection pointed to commit
>> > caa4b02476e31fc7933d2138062f7f355d3cd8f7 (blk-map: call
>> > blk_queue_bounce from blk_rq_append_bio). A revert fixes the
>> > problem (tested on 4.13 and master).
>>
>> Thanks for your report - can you try the below patch? Totally
>> untested...
>
> I applied the patch on master
> (968edbd93c0cbb40ab48aca972392d377713a0c3), I tried two times to boot
> the system but couldn't get to the shell. I found this in the log:

Hi Michele,

Please test the patches I sent out and see if it fixes your issue. In
my environment
the two just works fine.

https://marc.info/?l=linux-block&m=151358285916762&w=2

-- 
Ming Lei