On Mon, Oct 21, 2013 at 8:37 PM, David Sterba <dsterba@xxxxxxx> wrote: > On Mon, Oct 21, 2013 at 04:36:41PM +0800, david pu wrote: >> I'm running into btrfs-transaction hang issue with below call trace >> from dmesg[1]. >> when this issue happens, all filesystem r/w access will be blocked and >> no response in terminal. I'm using Ubuntu raring(linux 3.2 kernel) >> 64bit kernel as below: >> Linux dpu-e6410 3.2.0-36-generic #57-Ubuntu SMP Tue Jan 8 21:44:52 UTC >> 2013 x86_64 x86_64 x86_64 GNU/Linux >> >> is it a known issue? How to recover from such task hung status? > > The message can occur when > > 1) system is under heavy load or fragmentation slows down the IO, this > is harmless, the warnings stop after a few cycles It happens after I login into Ubuntu with lightdm.I did not find a method to reproduce it consistently. > > 2) it's a bug and the system cannot move forward due to a deadlock, the > warnings appear repeatedly and the IO seems to be stalled > > For a 3.2 kernel it's possible that the bug is there. I'm very sorry about the kernel version I pasted in previous email. I pasted wrong uname -a result. it should be: Linux dpu-desktop 3.8.0-31-generic #46-Ubuntu SMP Tue Sep 10 20:03:44 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux will upgrade kernel to latest version to have a try. > > david -- () ASCII Ribbon Campaign /\ Keep it simple! -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
