Description of problem: Creating a snapshot of root while redirecting the stderr to a file on the root filesystem always hangs. Version-Release number of selected component (if applicable): lvm2 2.02.98(2) (2012-10-15) linux 3.6.6-3.fc18.i686 #1 SMP Mon Nov 5 16:47:11 UTC 2012 [everything bog-standard Fedora 18] How reproducible: Always Steps to Reproduce: 1. lvcreate -s -n rootcopy -l 100%FREE -vvvv /dev/fedora/root 2>/root/output 2. 3. Actual results: Hang (root file system gets inaccessible) Expected results: Creates snapshot and outputs stderr to file Additional info: I have tested this on many different kernels. Original bug report on Ubuntu, then lm-devel, but I think this will be more effectively escalated by lvm2 people, if necessary (if the bug is in the kernel).
Currently you cannot log on the system partition when you are making snapshot of it. It fills the internal glibc buffer and will wait on flush. So you should be able to get log if you would be using different device (i.e. /dev/shm which is typically in you ram)
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