Re: kernel oops on mmotm-2015-10-15-15-20

[yalin wang]

> On Nov 19, 2015, at 14:58, Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> wrote:
> 
> uncharged
i also encounter this crash ,

also  i encounter a crash like this in qemu:


[    2.703436] [<ffffffc0001d4d2c>] do_execveat_common.isra.36+0x4f0/0x630
[    2.703624] [<ffffffc0001d4e90>] do_execve+0x24/0x30
[    2.703767] [<ffffffc0001d50e0>] SyS_execve+0x1c/0x2c
[    2.703923] BUG: Bad page map in process init  pte:6000004837ebd3 pmd:b29e7003
[    2.704140] page:ffffffc07f00af80 count:2 mapcount:-1 mapping:          (null) index:0x1
[    2.704414] flags: 0x400000000014(referenced|dirty)
[    2.704563] page dumped because: bad pte
[    2.704666] addr:0000007fafb7e000 vm_flags:00100073 anon_vma:ffffffc0729bdb90 mapping:          (null) index:7fafb7e
[    2.704906] file:          (null) fault:          (null) mmap:          (null) readpage:          (null)
[    2.705117] CPU: 0 PID: 84 Comm: init Tainted: G    B           4.2.0ajb-00005-g11a9bf3 #80
[    2.705315] Hardware name: ranchu (DT)
[    2.705408] Call trace:
[    2.705488] [<ffffffc000089ea0>] dump_backtrace+0x0/0x124
[    2.705657] [<ffffffc000089fd4>] show_stack+0x10/0x1c
[    2.705797] [<ffffffc0005f1df0>] dump_stack+0x78/0x98
[    2.705971] [<ffffffc00018a8d4>] print_bad_pte+0x154/0x1f0
[    2.706102] [<ffffffc00018c5f4>] unmap_single_vma+0x574/0x704
[    2.706236] [<ffffffc00018d0a4>] unmap_vmas+0x54/0x70
[    2.706354] [<ffffffc000195e70>] exit_mmap+0x88/0xfc
[    2.706473] [<ffffffc000097af4>] mmput+0x48/0xe8
[    2.706584] [<ffffffc0001d3b64>] flush_old_exec+0x30c/0x79c
[    2.706719] [<ffffffc000225fa4>] load_elf_binary+0x21c/0x1098
[    2.706856] [<ffffffc0001d4330>] search_binary_handler+0xa8/0x224
[    2.706995] [<ffffffc0001d4d2c>] do_execveat_common.isra.36+0x4f0/0x630
[    2.707144] [<ffffffc0001d4e90>] do_execve+0x24/0x30
[    2.707263] [<ffffffc0001d50e0>] SyS_execve+0x1c/0x2c
[    2.707392] BUG: Bad page map in process init  pte:6000004837fbd3 pmd:b29e7003
[    2.707752] page:ffffffc07f00afc0 count:2 mapcount:-1 mapping:          (null) index:0x1
[    2.708167] flags: 0x400000000014(referenced|dirty)
[    2.708333] page dumped because: bad pte
[    2.708501] addr:0000007fafb7f000 vm_flags:00100073 anon_vma:ffffffc0729bdb90 mapping:          (null) index:7fafb7f
[    2.709084] file:          (null) fault:          (null) mmap:          (null) readpage:          (null)
[    2.709306] CPU: 0 PID: 84 Comm: init Tainted: G    B           4.2.0ajb-00005-g11a9bf3 #80
[    2.709494] Hardware name: ranchu (DT)

seems the page map count is not correct ..
i build is based on mmotm-2015-10-21-14-41

Thanks



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