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
