I'm experiencing random crashes on my system.
I've narrowed the problem to the fstrim program that's launched weekly by cron.
In the console, I've got a set of blocked tasks among whigetch I find fstrim. (other blocked tasks are jdb2/dm, rs:main Q:Reg, kworker/u16).
I tried running fstrim manually and reproduced the crash, but can't get more details than the blocked tasks messages - all is frozen.
Any idea on how I can find out what happens?
My setup is: 1 SSD containing 2 LVM2 partitions 1 HDD with 2 LVM2 partitions which are the mirrors of the SSD ones.
Any obvious mistake with that setup?
My system is Ubuntu 14.04 64bit, kernel 3.13.0-35-generic. issue_discards is enabled in lvm.conf