Am 22.04.19 um 22:37 schrieb Nathan Dehnel: > I have a raid10 volume that frequently locks up when I try to write to > it or delete things. Any command that touches it will hang (and can't > be killed) and I have to start a new ssh session to get into the > computer again. Nothing fixes it besides a reboot, and the volume will > fail to unmount while the computer is shutting down. > > [ 302.360912] sysrq: SysRq : Show Blocked State > [ 302.360951] task PC stack pid father > [ 302.360987] btrfs-transacti D 0 2187 2 0x80000000 > [ 302.360993] Call Trace: [...] Nathan, I presume you are using a kernel before 4.19.8 and after 4.0.9.x. Your Post does not mention the kernel version, you use. Could you please post the output of "uname -a" ? During the rework of the kernel scheduler (multi queue schechduler) by the kernel team around Linus, there were huge modification done, which effected nearly all filesystems. Those rewritings caused data loss in ext4, complete crashes in xfs and so on. I was hit by this issue on BTRFS, so your description was somewhat a dejavu for me. Your can try to use the old mono-queued schedulers in an interim kernel, or you may upgrade to an recent kernel. The means disable "kyber" scheduler, wihch is default after 4.18.x or so, and reactivate cfq, bfq or deadline or noop scheduler. If your problems are solved it would be a great idea to upgrade the kernel. We use BTRFS as raid5 (not advised, experimaental), but we use it with kernel 5.x in arch linux. Even the multi device code is under heavy development, BTRFS likes the most recent kernels! mit freundlichen Grüßen Jürgen Sauer
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