Arch Linux

bond

Member

From: Melbourne, Australia

Registered: 2009-05-05

Posts: 62

bcache_writebac:126 blocked for more than 120 seconds.

Howdy, just reformatted system to setup bcache and getting the following in dmesg;

[ 1318.127456] INFO: task bcache_writebac:126 blocked for more than 120 seconds.
[ 1318.127459]       Not tainted 3.16.3-1-ARCH #1
[ 1318.127460] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1318.127461] bcache_writebac D 0000000000000000     0   126      2 0x00000000
[ 1318.127464]  ffff8804066dfeb0 0000000000000046 ffff880406fcdbb0 0000000000014580
[ 1318.127466]  ffff8804066dffd8 0000000000014580 ffff880406fcdbb0 ffff8804066dfe30
[ 1318.127467]  ffffffff810a2b0f ffff880405cda510 ffff880405cda5a0 ffff880405cda630
[ 1318.127469] Call Trace:
[ 1318.127474]  [<ffffffff810a2b0f>] ? try_to_wake_up+0x1ff/0x380
[ 1318.127476]  [<ffffffff810a2cf2>] ? default_wake_function+0x12/0x20
[ 1318.127478]  [<ffffffff810b6435>] ? __wake_up_common+0x55/0x90
[ 1318.127499]  [<ffffffffa0020c40>] ? write_dirty_finish+0x280/0x280 [bcache]
[ 1318.127502]  [<ffffffff8152d289>] schedule+0x29/0x70
[ 1318.127505]  [<ffffffff81091cc5>] kthread+0xc5/0x100
[ 1318.127507]  [<ffffffff81091c00>] ? kthread_create_on_node+0x1b0/0x1b0
[ 1318.127509]  [<ffffffff8153107c>] ret_from_fork+0x7c/0xb0
[ 1318.127511]  [<ffffffff81091c00>] ? kthread_create_on_node+0x1b0/0x1b0

[thermionix@arch-i5 ~]$ uname -r
3.16.3-1-ARCH
[thermionix@arch-i5 ~]$ cat /sys/block/bcache0/bcache/writeback_running
1
[thermionix@arch-i5 ~]$ cat /sys/block/bcache0/bcache/cache_mode
[writethrough] writeback writearound none
[thermionix@arch-i5 ~]$ cat /sys/block/bcache0/bcache/state
clean

any tips?