On Wed, 2017-10-25 at 12:34 -0700, Jens Axboe wrote: > On 10/25/2017 12:25 PM, Bart Van Assche wrote: > > On Wed, 2017-10-25 at 11:23 -0700, Jens Axboe wrote: > > > On 10/25/2017 02:56 AM, Bart Van Assche wrote: > > > > Avoid that submitting an SG_IO ioctl triggers a kernel oops that > > > > is preceded by: > > > > > > > > usercopy: kernel memory overwrite attempt detected to (null) (<null>) (6 bytes) > > > > kernel BUG at mm/usercopy.c:72! > > > > > > Seems I saw a note on a runtime oops triggered by this patch yesterday, > > > but now I can't seem to find it... Did you see it? > > > > Do you perhaps want me to add the stack trace from the following e-mail to > > the patch description: https://marc.info/?l=linux-arm-kernel&m=150854010321833 ? > > It was an oops reported against the current patch, unless I'm mistaken. Hard > to say, when I can't find the email this morning, may have been deleted... > That's why I asked if you saw it. Just found it: a570843ee9 ("virtio_blk: Fix an SG_IO regression"): kernel BUG at include/linux/scatterlist.h:92! (https://lkml.org/lkml/2017/10/24/1117). Will have a look. Bart.
