NAS 104 locking up

I've seen the same on OS6, though on the #notsupported method of running it on an Ultra2. In my case, btrfs/kernel memory is doing something weird. Via SSH, the system says 'out of disk space', even though clearly has space, likely some memory leak. The GUI (readynasd) is unusable because it cannot write to its database (disk full), so it won't even load up. Only a reboot resolves it for ~12 hours.

If you have SSH, are you able to even try 'touch ~/test', or does it report disk full in that state?

$ ssh root@10.1.2.1
root@10.1.2.1's password: 
Welcome to ReadyNASOS 6.0.5
# touch test
touch: cannot touch `test': No space left on device
# free
             total       used       free     shared    buffers     cached
Mem:       1009736     765592     244144          0       1272     563856
-/+ buffers/cache:     200464     809272
Swap:       523964          0     523964
# df -h
Filesystem      Size  Used Avail Use% Mounted on
rootfs          4.0G  2.2G  1.4G  62% /
tmpfs            10M  4.0K   10M   1% /dev
/dev/md0        4.0G  2.2G  1.4G  62% /
tmpfs           494M  4.0K  494M   1% /dev/shm
tmpfs           494M  7.1M  486M   2% /run
tmpfs           494M     0  494M   0% /sys/fs/cgroup
tmpfs           494M     0  494M   0% /media
/dev/md127      927G  215G  675G  25% /data
/dev/md127      927G  215G  675G  25% /home
/dev/md127      927G  215G  675G  25% /apps

Out of curiosity, I went poking around, and found that if I disable the space_cache option on this mount point, the 'out of disk space' issue goes away, not requiring a reboot to get back to sane function.

# mount
tmpfs on /dev type tmpfs (rw,relatime,size=10240k,mode=755)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
/dev/md0 on / type btrfs (rw,relatime,space_cache)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpu type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=24,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
tmpfs on /media type tmpfs (rw,nosuid,nodev,noexec,relatime,mode=755)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/md127 on /data type btrfs (rw,relatime,space_cache)
/dev/md127 on /home type btrfs (rw,relatime,space_cache)
/dev/md127 on /apps type btrfs (rw,relatime,space_cache)
# mount -o remount,nospace_cache /
# mount
tmpfs on /dev type tmpfs (rw,relatime,size=10240k,mode=755)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
/dev/md0 on / type btrfs (rw,relatime,nospace_cache)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpu type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=24,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
tmpfs on /media type tmpfs (rw,nosuid,nodev,noexec,relatime,mode=755)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/md127 on /data type btrfs (rw,relatime,space_cache)
/dev/md127 on /home type btrfs (rw,relatime,space_cache)
/dev/md127 on /apps type btrfs (rw,relatime,space_cache)
# touch test
# df -h
Filesystem      Size  Used Avail Use% Mounted on
rootfs          4.0G  2.1G  1.4G  62% /
tmpfs            10M  4.0K   10M   1% /dev
/dev/md0        4.0G  2.1G  1.4G  62% /
tmpfs           494M  4.0K  494M   1% /dev/shm
tmpfs           494M  7.1M  486M   2% /run
tmpfs           494M     0  494M   0% /sys/fs/cgroup
tmpfs           494M     0  494M   0% /media
/dev/md127      927G  215G  675G  25% /data
/dev/md127      927G  215G  675G  25% /home
/dev/md127      927G  215G  675G  25% /apps