Bug 3875 - jbd2 locks an unmounted file system
: jbd2 locks an unmounted file system
Product: Desktop Bugs
Classification: ROSA Desktop
Component: Main Packages
: Fresh
: All Linux
: Normal normal
: ---
Assigned To: Eugene Shatokhin
: ROSA Linux Bugs
Depends on:
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Reported: 2014-03-24 18:17 MSK by Konstantin Vlasov
Modified: 2014-03-24 18:17 MSK (History)
0 users

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Description Konstantin Vlasov 2014-03-24 18:17:14 MSK
After some time of working in Live mode I notice that I cannot format an unmounted partition:

[root@localhost live]# mkfs.ext4 /dev/sda2
mke2fs 1.42.5 (29-Jul-2012)
/dev/sda2 is apparently in use by the system; will not make a filesystem here!

Investigation shows that the partition is locked by jbd2:

[root@localhost live]# lsof | grep sda
jbd2/sda2 3982            root  cwd       DIR              252,0     4096          2 /
jbd2/sda2 3982            root  rtd       DIR              252,0     4096          2 /
jbd2/sda2 3982            root  txt   unknown                                        /proc/3982/exe

Usually, this problem appears after I try to install ROSA from live system on an existing partition (not each time, unfortunately). Detailed steps:
0. Prerequisites: the hard drive contains only one partition which is ext4-formatted (and large enough to hold ROSA); one swap-formatted partition may also be present in addition to this ext4.
1. Start draklive-install.
2. In partitioning select "Use existing partitions" (the ext4-partition will be selected for the root of the target system).
3. On the next step agree to format this partition, continue installation.
4. After installation is completed (draklive-install exited), the target partition remains locked by jbd2, despite the fact that it is now unmounted.