Hi, Seems I broke something. I have run into this problem about 3 times now where bCache (or something!) seems to hang and I only just thought to check kern.log before trying to reboot so was previously assuming something else had just got stuck! I only had 3 servers available to me and once this problem occurs, the servers seems to get stuck rebooting so I cannot do another test to confirm tonight. (I have put a reboot request in for them to be force rebooted but that will not get actioned until tomorrow) Here is what I know about the most recent time this happened: I had already set-up and been using /dev/bcache0 and /dev/bcache1. They are attached to the cache set and set to writeback. The problem occurred when I ran "echo /dev/rbd2 >/sys/fs/bcache/register". This device had been newly formatted with "make-bcache -B /dev/rbd2" (rbd2 is a SAN based block device) If it makes any difference - these commands are in a script so the register command would have been run *immediately* after the make-bcache command returned. (I am going to try sticking a sleep 3 or something in there tomorrow - just in case its related to trying to register the device so quickly after it was prepared) At this point my console just stops. I cannot CTRL+C to abort the echo command. top shows increasing load average - presumably it thinks a process is stuck waiting for something. Rebooting server kicks me out of console and then never comes back. /dev/rbd0 and /dev/rbd1 are already registered at this point and were working fine. If I open another console (did this before rebooting) and create /dev/rbd3, and then try and register it - the same happens again. Here is what came up in kern.log: http://pastebin.com/xNBuv3sj (Using Gmane to post and it complained about long lines) Any ideas? Cheers, James -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
