Re: hugepage test failures

[Randy Dunlap <randy.dunlap@oracle.com>]

Nish Aravamudan wrote:
> On 7/23/07, Randy Dunlap <randy.dunlap@oracle.com> wrote:
>> Hi,
>>
>> I'm a few hundred linux-mm emails behind, so maybe this has been
>> addressed already.  I hope so.
>>
>> I run hugepage-mmap and hugepage-shm tests (from Doc/vm/hugetlbpage.txt)
>> on a regular basis.  Lately they have been failing, usually with -ENOMEM,
>> but sometimes the mmap() succeeds and hugepage-mmap gets a SIGBUS:
> 
> Would it be possible for you instead to run the libhugetlbfs tests?

OK, I'm downloading that now.

> They are kept uptodate, at least.

You mean that the Doc/ tree is not kept up to date?  ;(

But this represents an R*word (regression).
These tests ran successfully until recently (I can't say when).

>> open("/mnt/hugetlbfs/hugepagefile", O_RDWR|O_CREAT, 0755) = 3
>> mmap(NULL, 268435456, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 
>> 0x2af31d2c3000
>> fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0
>> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
>> 0) = 0x2af32d2c3000
>> write(1, "Returned address is 0x2af31d2c30"..., 35) = 35
>> --- SIGBUS (Bus error) @ 0 (0) ---
>> +++ killed by SIGBUS +++
>>
>>
>> and:
>>
>> # ./hugepage-shm
>> shmget: Cannot allocate memory
>>
>>
>> I added printk()s in many mm/mmap.c and mm/hugetlb.c error return
>> locations and got this:
>>
>> hugetlb_reserve_pages: -ENOMEM
>>
>> which comes from mm/hugetlb.c::hugetlb_reserve_pages():
>>
>>         if (chg > cpuset_mems_nr(free_huge_pages_node)) {
>>                 printk(KERN_DEBUG "%s: -ENOMEM\n", __func__);
>>                 return -ENOMEM;
>>         }
>>
>> I had CONFIG_CPUSETS=y so I disabled it, but the same error
>> still happens.
> 
> As in the same cpusets_mems_nr() check fails?
> 
>> Suggestions?  Fixex?
> 
> Which kernel is this?

Ah, sorry, 2.6.23-rc1.


-- 
~Randy
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