[dm-devel] DM / LVM hangs if snapshot present on kernel v3.0.3

Spelic spelic at shiftmail.org
Tue Feb 21 10:22:03 UTC 2012


On 02/20/12 18:17, Zdenek Kabelac wrote:
> Dne 20.2.2012 16:09, Spelic napsal(a):
>> On 02/20/12 14:51, Mike Snitzer wrote:
>>> I've never seen this. Which distro are you using?
>> Ubuntu 11.04  64-bit but with vanilla 3.0.3 kernel
>>
>> Ubuntu's lvm:
>> # lvm version
>>    LVM version:     2.02.66(2) (2010-05-20)
>>    Library version: 1.02.48 (2010-05-20)
>>
> So I'd guess you might be a 'victim' of Debian home-brew udev rules for lvm2,
> which were unfortunately not consulted with upstream (nor udev, nor lvm).

Indeed I have had a few bad experiences with Ubuntu's udev rules, but 
never like this...
I don't think a wrong udev rule can hangup the whole machine with such 
symptoms, you really think so?

- lvs and/or "lvchange --refresh ..." processes hanging forever in 
kernel code (and AFAIR it was in DM region, that's the /proc/pid/stack 
trace which I unfortunately lost)

- "sync" also cannot complete, so I can only do force reboot without flush




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