On Fri, Jul 06, 2018 at 06:19:02PM -0700, syzbot wrote: > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+b8e0dfee3fd8c9012771@xxxxxxxxxxxxxxxxxxxxxxxxx > > raw: 02fffc0000001028 ffffea0007011dc8 ffffea0007058b48 ffff8801a7576ab8 > raw: 000000000000016e ffff8801a7588930 00000003ffffffff ffff8801d9a44c80 > page dumped because: VM_BUG_ON_PAGE(page_to_pgoff(page) != index) > page->mem_cgroup:ffff8801d9a44c80 > ------------[ cut here ]------------ > kernel BUG at mm/shmem.c:815! > invalid opcode: 0000 [#1] SMP KASAN > CPU: 0 PID: 4429 Comm: syz-executor697 Not tainted 4.18.0-rc3-next-20180706+ > #1 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:shmem_undo_range+0xdaa/0x29a0 mm/shmem.c:815 Pretty sure this one's mine. At least I spotted a codepath earlier today which could lead to it. I'll fix it in the morning.
