On Tue, Apr 11, 2017 at 4:01 AM, Alex Gorbachev <ag@xxxxxxxxxxxxxxxxxxx> wrote:
> On Mon, Apr 10, 2017 at 2:16 PM, Alex Gorbachev <ag@xxxxxxxxxxxxxxxxxxx> wrote:
>> I am trying to understand the cause of a problem we started
>> encountering a few weeks ago. There are 30 or so per hour messages on
>> OSD nodes of type:
>>
>> ceph-osd.33.log:2017-04-10 13:42:39.935422 7fd7076d8700 0 bad crc in
>> data 2227614508 != exp 2469058201
>>
>> and
>>
>> 2017-04-10 13:42:39.939284 7fd722c42700 0 -- 10.80.3.25:6826/5752
>> submit_message osd_op_reply(1826606251
>> rbd_data.922d95238e1f29.00000000000101bf [set-alloc-hint object_size
>> 16777216 write_size 16777216,write 6328320~12288] v103574'18626765
>> uv18626765 ondisk = 0) v6 remote, 10.80.3.216:0/1934733503, failed
>> lossy con, dropping message 0x3b55600
>>
>> On a client sometimes, but not corresponding to the above:
>>
>> Apr 10 11:53:15 roc-5r-scd216 kernel: [4906599.023174] libceph: osd96
>> 10.80.3.25:6822 socket error on write
>>
>> And from time to time, slow requests:
>>
>> 2017-04-10 13:00:04.280686 osd.91 10.80.3.45:6808/5665 231 : cluster
>> [WRN] slow request 30.108325 seconds old, received at 2017-04-10
>> 12:59:34.172283: osd_op(client.11893449.1:324079247
>> rbd_data.8fcdfb238e1f29.00000000000187e7 [set-alloc-hint object_size
>> 16777216 write_size 16777216,write 10772480~8192] 14.ed0bcdec
>> ondisk+write e103545) currently waiting for subops from 2,104
>> 2017-04-10 13:00:06.280949 osd.91 10.80.3.45:6808/5665 232 : cluster
>> [WRN] 2 slow requests, 1 included below; oldest blocked for >
>> 32.108610 secs
>>
>> Questions:
>>
>> 1. Is there any way to drill further into the "bad crc" message?
>> sometimes they have nothing before or after them, but how to determine
>> from/to what this came from - another OSD, client, which one?
>>
>> 2. Network seems OK - no errors on NICs, regression testing does not
>> show any issues. I realize this can be disk response, but using
>> Christian Balzer's atop recommendation shows a pretty normal system.
>> What is my best course of troubleshooting here - dump historic ops on
>> OSD, wireshark the links or anything else?
>>
>> 3. Christian, if you are looking at this, what would be your red flags in atop?
>>
>
> One more note: OSD nodes are running kernel 4.10.2-041002-generic and
> clients - 4.4.23-040423-generic
Hi Alex,
Did you upgrade the kernel client from < 4.4 to 4.4 somewhere in that time
frame by any chance?
Thanks,
Ilya
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