On 2019/01/07 14:58, Dmitry Vyukov wrote: > On Mon, Jan 7, 2019 at 5:19 AM Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: >> I tossed it in there. >> >> But I wonder if anyone is actually running this code. Because >> >> --- a/lib/Kconfig.debug~info-task-hung-in-generic_file_write_iter >> +++ a/lib/Kconfig.debug >> @@ -2069,6 +2069,12 @@ config IO_STRICT_DEVMEM >> >> If in doubt, say Y. >> >> +config DEBUG_AID_FOR_SYZBOT >> + bool "Additional debug code for syzbot" >> + default n >> + help >> + This option is intended for testing by syzbot. >> + > > > Yes, syzbot always defines this option: > > https://github.com/google/syzkaller/blob/master/dashboard/config/upstream-kasan.config#L14 > https://github.com/google/syzkaller/blob/master/dashboard/config/upstream-kmsan.config#L9 > > It's meant specifically for such cases. > > Tetsuo already got some useful information for past bugs using this feature. > Andrew, you can drop this patch, for a patch that fixes this problem is already available at https://lkml.kernel.org/r/1547093005-26085-1-git-send-email-longman@xxxxxxxxxx . Peter, please apply the fix from Waiman Long.
