[linux-lvm] LVM hangs

Zdenek Kabelac zkabelac at redhat.com
Mon Nov 13 15:20:16 UTC 2017

Dne 13.11.2017 v 16:12 Alexander 'Leo' Bergolth napsal(a):
> Hi!
> On 11/13/2017 03:51 PM, Zdenek Kabelac wrote:
>> Dne 13.11.2017 v 14:41 Alexander 'Leo' Bergolth napsal(a):
>>> I have a EL7 desktop box with two sata harddisks and two ssds in a
>>> LVM raid1 - thin pool - cache configuration. (Just migrated to this
>>> setup a few weeks ago.)
>>> After some days, individual processes start to block in disk wait.
>>> I don't know if the problem resides in the cache-, thin- or raid1-layer
>>> but the underlying block-devices are fully responsive.
>>> I have prepared some info at:
>>>     http://leo.kloburg.at/tmp/lvm-blocks/
>>> Do the stack backtraces provide enough information to locate the source
>>> of the blocks?
>>> I'd be happy to provide additional info, if necessary.
>>> Meanwhile I'll disable the LVM cache layer to eliminate this potential
>>> candidate.
>> It would be probably nice to see the result of 'dmsetup status'
> OK. Will be included next time.
>> I'd have guessed you are probably hitting  'frozen' raid state
>> which is unfortunate existing upstream bug.
> Are you talking about RH bug 1388632?
> https://bugzilla.redhat.com/show_bug.cgi?id=1388632
> Unfortunately I can only view the google-cached version of the bugzilla
> page, since the bug is restricted to internal view only.

that could be similar issue yes

> But the google-cached version suggests that the bug is mainly hit when
> removing the raid-backed cache pool under IO.
> I my scenario, no modification (like cache removal) of the lvm setup was
> done when the blocks occured.

Easiest is to check  'dmsetup status' - just to exclude if it's frozen raid case.


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