On Fri, Dec 18, 2015 at 2:23 PM, Eric Eastman
<eric.eastman@xxxxxxxxxxxxxx> wrote:
>> Hi Yan Zheng, Eric Eastman
>>
>> Similar bug was reported in f2fs, btrfs, it does affect 4.4-rc4, the fixing
>> patch was merged into 4.4-rc5, dfd01f026058 ("sched/wait: Fix the signal
>> handling fix").
>>
>> Related report & discussion was here:
>> https://lkml.org/lkml/2015/12/12/149
>>
>> I'm not sure the current reported issue of ceph was related to that though,
>> but at least try testing with an upgraded or patched kernel could verify it.
>> :)
>>
>> Thanks,
>>
>>> -----Original Message-----
>>> From: ceph-devel-owner@xxxxxxxxxxxxxxx [mailto:ceph-devel-owner@xxxxxxxxxxxxxxx] On Behalf Of
>>> Yan, Zheng
>>> Sent: Friday, December 18, 2015 12:05 PM
>>> To: Eric Eastman
>>> Cc: Ceph Development
>>> Subject: Re: Issue with Ceph File System and LIO
>>>
>>> On Fri, Dec 18, 2015 at 3:49 AM, Eric Eastman
>>> <eric.eastman@xxxxxxxxxxxxxx> wrote:
>>> > With cephfs.patch and cephfs1.patch applied and I am now seeing:
>>> >
>>> > [Thu Dec 17 14:27:59 2015] ------------[ cut here ]------------
>>> > [Thu Dec 17 14:27:59 2015] WARNING: CPU: 0 PID: 3036 at
>>> > fs/ceph/addr.c:1171 ceph_write_begin+0xfb/0x120 [ceph]()
>>> > [Thu Dec 17 14:27:59 2015] Modules linked in: iscsi_target_mod
> ...
>>> >
>>>
>>> The page gets unlocked mystically. I still don't find any clue. Could
>>> you please try the new patch (not incremental patch). Besides, please
>>> enable CONFIG_DEBUG_VM when compiling the kernel.
>>>
>>> Thanks you very much
>>> Yan, Zheng
>>
> I have just installed the cephfs_new.patch and have set
> CONFIG_DEBUG_VM=y on a new 4.4rc4 kernel and restarted the ESXi iSCSI
> test to my Ceph File System gateway. I plan to let it run overnight
> and report the status tomorrow.
>
> Let me know if I should move on to 4.4rc5 with or without patches and
> with or without CONFIG_DEBUG_VM=y
>
please try rc5 kernel without patches and DEBUG_VM=y
Regards
Yan, Zheng
> Looking at the network traffic stats on my iSCSI gateway, with
> CONFIG_DEBUG_VM=y, throughput seems to be down by a factor of at least
> 10 compared to my last test without setting CONFIG_DEBUG_VM=y
>
> Regards,
> Eric
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