On Sat, Sep 23, 2017 at 12:56 AM, Reza Arbab <[email protected]> wrote: > With device public pages at the end of my memory space, I'm getting > output from _vm_normal_page(): > > BUG: Bad page map in process migrate_pages pte:c0800001ffff0d06 pmd:f95d3000 > addr:00007fff89330000 vm_flags:00100073 anon_vma:c0000000fa899320 mapping: > (null) index:7fff8933 > file: (null) fault: (null) mmap: (null) readpage: > (null) > CPU: 0 PID: 13963 Comm: migrate_pages Tainted: P B OE 4.14.0-rc1-wip > #155 > Call Trace: > [c0000000f965f910] [c00000000094d55c] dump_stack+0xb0/0xf4 (unreliable) > [c0000000f965f950] [c0000000002b269c] print_bad_pte+0x28c/0x340 > [c0000000f965fa00] [c0000000002b59c0] _vm_normal_page+0xc0/0x140 > [c0000000f965fa20] [c0000000002b6e64] zap_pte_range+0x664/0xc10 > [c0000000f965fb00] [c0000000002b7858] unmap_page_range+0x318/0x670 > [c0000000f965fbd0] [c0000000002b8074] unmap_vmas+0x74/0xe0 > [c0000000f965fc20] [c0000000002c4a18] exit_mmap+0xe8/0x1f0 > [c0000000f965fce0] [c0000000000ecbdc] mmput+0xac/0x1f0 > [c0000000f965fd10] [c0000000000f62e8] do_exit+0x348/0xcd0 > [c0000000f965fdd0] [c0000000000f6d2c] do_group_exit+0x5c/0xf0 > [c0000000f965fe10] [c0000000000f6ddc] SyS_exit_group+0x1c/0x20 > [c0000000f965fe30] [c00000000000b184] system_call+0x58/0x6c > > The pfn causing this is the very last one. Correct the bounds check > accordingly. > > Fixes: df6ad69838fc ("mm/device-public-memory: device memory cache coherent > with CPU") > Cc: Jérôme Glisse <[email protected]> > Signed-off-by: Reza Arbab <[email protected]> > ---
Reviewed-by: Balbir Singh <[email protected]>
