Hi, On Sun, Mar 30, 2014 at 12:53:12PM +0200, Francis Moreau wrote: > > As I was expecting I'm getting new issues with bcache after upgrading my > kernel: > > [Mar30 12:24] INFO: task bcache_writebac:155 blocked for more than 120 > seconds. > [ +0.000007] Not tainted 3.13.7-1-ARCH #1 > [ +0.000002] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > disables this message. > [ +0.000003] bcache_writebac D 0000000000000000 0 155 2 > 0x00000000 > [ +0.000006] ffff8804049c5eb8 0000000000000046 ffff880405816c00 > ffff8804049c5fd8 > [ +0.000005] 0000000000014440 0000000000014440 ffff880405816c00 > ffff8804049c5e38 > [ +0.000004] ffffffff810925fa 24448b48e0d83524 fa83ffffee31e918 > 0000000000000046 > [ +0.000004] Call Trace: > [ +0.000010] [<ffffffff810925fa>] ? try_to_wake_up+0x1fa/0x2c0 > [ +0.000006] [<ffffffff81092712>] ? default_wake_function+0x12/0x20 > [ +0.000005] [<ffffffff810a2538>] ? __wake_up_common+0x58/0x90 > [ +0.000023] [<ffffffffa03c7470>] ? read_dirty_endio+0x60/0x60 [bcache] > [ +0.000005] [<ffffffff81516239>] schedule+0x29/0x70 > [ +0.000006] [<ffffffff8108358d>] kthread+0xad/0xf0 > [ +0.000005] [<ffffffff810834e0>] ? kthread_create_on_node+0x180/0x180 > [ +0.000005] [<ffffffff81521abc>] ret_from_fork+0x7c/0xb0 > [ +0.000005] [<ffffffff810834e0>] ? kthread_create_on_node+0x180/0x180 > > That's just sad to see how unstable was/is bcache sub system and I still > don't understand why it was not marked as experimental. > > 3.12 was/is buggy when used with writeback mode, and I just had to live > with cache-through. I tried to get some helps (and others too) but no > answers. > > I read there were issue with 3.13, so I delayed my kernel upgrade as far > I could due to this. I was hoping that issues were fixed in 3.13.x > stable tree but apparently not. > > Hopefully this one will not be ignored. Francis - I've found it helps if you add all the relevant addresses mentioned in https://www.kernel.org/doc/linux/MAINTAINERS . For this mail I'm going to explicitly CC Kent to help this get noticed. Additionally do you also see this problem with 3.14? -- Sitsofe | http://sucs.org/~sits/ -- 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
