Looking through the kernel log, this may be related: I booted into 4.0-rc7, and attempted to run it there at first: Apr 7 12:54:08 fileserver kernel: [ 2028.533893] bcache-register: page allocation failure: order:8, mode:0x ... memory dump Apr 7 12:54:08 fileserver kernel: [ 2028.541396] bcache: register_cache() error opening sda4: cannot allocate memory Apr 7 12:55:08 fileserver kernel: [ 2088.639190] bcache: __cached_dev_store() Can't attach 804d6906-fa80-40ac-9081-a71a4d595378 Apr 7 12:55:08 fileserver kernel: [ 2088.639190] : cache set not found I poked the vm.min_free_kbytes and retried, and got the following: Apr 7 12:55:29 fileserver kernel: [ 2109.303315] bcache: run_cache_set() invalidating existing data Apr 7 12:55:29 fileserver kernel: [ 2109.408255] bcache: bch_cached_dev_attach() Caching md127 as bcache0 on set 804d6906-fa80-40ac-9081-a71a4d595378 Apr 7 12:55:29 fileserver kernel: [ 2109.408443] bcache: register_cache() registered cache device sda4 Apr 7 12:55:33 fileserver kernel: [ 2113.307687] bcache: bch_cached_dev_attach() Can't attach md127: already attached Apr 7 12:55:33 fileserver kernel: [ 2113.307747] bcache: __cached_dev_store() Can't attach 804d6906-fa80-40ac-9081-a71a4d595378 Apr 7 12:55:33 fileserver kernel: [ 2113.307747] : cache set not found A few hours later, I was getting stalls: Apr 7 18:00:20 fileserver kernel: [20400.288049] INFO: task java:3610 blocked for more than 120 seconds. Apr 7 18:00:20 fileserver kernel: [20400.288069] Not tainted 4.0.0-rc7 #1 Apr 7 18:00:20 fileserver kernel: [20400.288085] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Apr 7 18:00:20 fileserver kernel: [20400.293521] INFO: task nmbd:22692 blocked for more than 120 seconds. Apr 7 18:00:20 fileserver kernel: [20400.293532] Not tainted 4.0.0-rc7 #1 Apr 7 18:00:20 fileserver kernel: [20400.293545] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. So I rebooted to 4.0-rc7 again: Apr 7 19:36:23 fileserver kernel: [ 2.145004] bcache: journal_read_bucket() 157: too big, 552 bytes, offset 2047 Apr 7 19:36:23 fileserver kernel: [ 2.154586] bcache: prio_read() bad csum reading priorities Apr 7 19:36:23 fileserver kernel: [ 2.154643] bcache: prio_read() bad magic reading priorities Apr 7 19:36:23 fileserver kernel: [ 2.158008] bcache: error on 804d6906-fa80-40ac-9081-a71a4d595378: bad btree header at bucket 65638, block 0, 0 keys, disabling caching Apr 7 19:36:23 fileserver kernel: [ 2.158408] bcache: cache_set_free() Cache set 804d6906-fa80-40ac-9081-a71a4d595378 unregistered Apr 7 19:36:23 fileserver kernel: [ 2.158468] bcache: register_cache() registered cache device sda4 Apr 7 19:36:23 fileserver kernel: [ 2.226581] md127: detected capacity change from 0 to 12001954234368 Apr 7 19:36:23 fileserver kernel: [ 2.265347] bcache: register_bdev() registered backing device md127 Apr 7 19:36:23 fileserver kernel: [ 21.423819] bcache: journal_read_bucket() 157: too big, 552 bytes, offset 2047 Apr 7 19:36:23 fileserver kernel: [ 21.432091] bcache: prio_read() bad csum reading priorities Apr 7 19:36:23 fileserver kernel: [ 21.432138] bcache: prio_read() bad magic reading priorities Apr 7 19:36:23 fileserver kernel: [ 21.435613] bcache: error on 804d6906-fa80-40ac-9081-a71a4d595378: bad btree header at bucket 65638, block 0, 0 keys, disabling caching Apr 7 19:36:23 fileserver kernel: [ 21.436225] bcache: cache_set_free() Cache set 804d6906-fa80-40ac-9081-a71a4d595378 unregistered Apr 7 19:36:23 fileserver kernel: [ 21.436273] bcache: register_cache() registered cache device sda4 At this point, everything is gone, and that's where I'm at right now. -- 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
