Hi, I have an Intel Core i7 based fileserver with 18TB BTRFS in a 6x 3TB RAID 1+0 configuration. The system was working fine running Ubuntu 13.04 (kernel 3.11.0-12-generic). The system was upgraded to Ubuntu 13.10 (kernel 3.11) and began to lock up daily, sometimes every couple of hours. Previously it never crashed and was only taken down for maintenance so a bug was files on launchpad (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1237794).
I have updated the system with mainline kernels "3.12.0-999-generic #201310090426" and "3.12.0-999-generic #201310170405" and still the lockups occur. Absolutely nothing is logged in the syslog, it is a complete freeze. I could get the system to hang by attempting to delete a 95GB tar file from a client (over NFS), it would lock up every time. At other times it just locks up (overnight for example). I have had a top session running a couple of times when it locks up and btrfs-transaction and btrfs-flush_del are using 3 to 5 cores at 50 to 100% (see top extract below). top - 12:06:37 up 1:51, 1 user, load average: 3.33, 0.87, 0.33 Tasks: 226 total, 5 running, 221 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.0 us, 48.5 sy, 0.0 ni, 50.9 id, 0.1 wa, 0.0 hi, 0.5 si, 0.0 st KiB Mem: 12295372 total, 12138296 used, 157076 free, 312 buffers KiB Swap: 7831536 total, 56 used, 7831480 free, 24644 cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1005 root 20 0 0 0 0 R 100. 1 0.0 0:50.16 btrfs-transacti 2462 root 20 0 0 0 0 R 75.8 0.0 0:06.66 btrfs-flush_del 2459 root 20 0 0 0 0 S 72.5 0.0 0:10.18 btrfs-flush_del 2463 root 20 0 0 0 0 S 70.5 0.0 0:14.41 btrfs-flush_del 2457 root 20 0 0 0 0 R 38.6 0.0 0:28.35 btrfs-flush_del 2458 root 20 0 0 0 0 S 17.0 0.0 0:39.31 btrfs-flush_del 1959 root 20 0 0 0 0 R 9.6 0.0 0:31.68 btrfs-flush_del 100 root 20 0 0 0 0 S 7.6 0.0 0:00.31 kswap I have looked in bugzilla and can't relate this to anything already reported, has anyone seen something similar to this? Regards Sean -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
