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SubjectNULL pointer dereference in the kernel 3.10
when runing the stabile docker cases in the vm.   The following issue will come up.

#40 [ffff8801b57ffb30] async_page_fault at ffffffff8165c9f8
[exception RIP: down_read_trylock+5]
RIP: ffffffff810aca65 RSP: ffff8801b57ffbe8 RFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff88018ae858c1 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: ffff8801b57ffc10 R8: ffffea0006903de0 R9: ffff8800b3c61810
R10: 00000000000022cb R11: 0000000000000000 R12: ffff88018ae858c0
R13: ffffea0006903dc0 R14: 0000000000000008 R15: ffffea0006903dc0
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0000
#41 [ffff8801b57ffbe8] page_lock_anon_vma_read at ffffffff811b241c
#42 [ffff8801b57ffc18] page_referenced at ffffffff811b26a7
#43 [ffff8801b57ffc90] shrink_active_list at ffffffff8118d634
#44 [ffff8801b57ffd48] balance_pgdat at ffffffff8118f088
#45 [ffff8801b57ffe20] kswapd at ffffffff8118f633
#46 [ffff8801b57ffec8] kthread at ffffffff810a795f
#47 [ffff8801b57fff50] ret_from_fork at ffffffff81665398
crash> struct page.mapping ffffea0006903dc0
mapping = 0xffff88018ae858c1
crash> struct anon_vma 0xffff88018ae858c0
struct anon_vma {
root = 0x0,
rwsem = {
count = 0,
wait_lock = {
raw_lock = {
{
head_tail = 1,
tickets = {
head = 1,
tail = 0
}
}
}
},
wait_list = {
next = 0x0,
prev = 0x0
}
},
refcount = {
counter = 0
},
rb_root = {
rb_node = 0x0
}
}

This maks me wonder, the anon_vma do not come from slab structure.
and the content is abnormal. IMO, At least anon_vma->root will not NULL.
The issue can be reproduced every other week.

Any comments will be appreciated.

Thanks
zhongjiang



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