Re: [LKP] [mm, oom] 6209f6fc62: general_protection_fault:#[##]

[Rong Chen]

On 09/25/2018 03:31 PM, Michal Hocko wrote:
> On Tue 25-09-18 15:00:15, Rong Chen wrote:
> > On 09/25/2018 02:06 PM, Michal Hocko wrote:
> > > On Tue 25-09-18 13:48:20, kernel test robot wrote:
> > > > FYI, we noticed the following commit (built with gcc-7):
> > > >
> > > > commit: 6209f6fc62835d84c2a92d237588a114e39436ce ("mm, oom: rework mmap_exit vs. oom_reaper synchronization")
> > > > https://github.com/0day-ci/linux UPDATE-20180911-024633/Tetsuo-Handa/mm-oom-Fix-unnecessary-killing-of-additional-processes/20180910-163452
> > > Do you have a msg-id to the patch that has been tested?
> > message_id: 20180910125513.311-2-mhocko@xxxxxxxxxx
> Thanks! It woudl be really great if this was a part of the report when
> testing patches which are not mainline yet.
>
> This patch resulting in a crash is quite surprising. The patch is RFC
> and not tested yet but I will definitely have a look. Could you help me
> some more and give faddr2line __oom_reap_task_mm+0x40 please?
$ faddr2line ./vmlinux __oom_reap_task_mm+0x40
__oom_reap_task_mm+0x40/0x175:
can_madv_dontneed_vma at mm/internal.h:48
Â(inlined by) __oom_reap_task_mm at mm/oom_kill.c:505

Best Regards,
Rong Chen