I have been running bcache in writeback mode for a while, and had an unclean shutdown due to a power outage. Machine rebooted, did an fsck, everything seemed ok, I had a few corrupt files that were open when the shutdown happened, but no major deal. Then, I started getting hung tasks: INFO: task bcache_writebac:1582 blocked for more than 120 seconds. [ 1322.829907] Tainted: P O 3.14.6-201406110805nik-deb-dirty #1 [ 1322.829910] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1322.829913] bcache_writebac D ffff8800b84db608 0 1582 2 0x00000000 [ 1322.829920] ffff8800b84db1f0 0000000000000046 0000000000012e40 ffff880233d53230 [ 1322.829927] 0000000000012e40 ffff88023067bfd8 0000000000012e40 ffff8800b84db1f0 [ 1322.829933] 0000000000000000 ffff880230611bc0 ffff880233bc0000 ffffffff813568a0 [ 1322.829939] Call Trace: [ 1322.829950] [<ffffffff813568a0>] ? write_dirty+0xc0/0xc0 [ 1322.829958] [<ffffffff8106b475>] ? kthread+0x95/0xe0 [ 1322.829963] [<ffffffff81070000>] ? put_cred_rcu+0xa0/0xc0 [ 1322.829969] [<ffffffff8106b3e0>] ? flush_kthread_worker+0x80/0x80 [ 1322.829976] [<ffffffff8149147c>] ? ret_from_fork+0x7c/0xb0 [ 1322.829981] [<ffffffff8106b3e0>] ? flush_kthread_worker+0x80/0x80 As you may notice, I'm on mainline kernel 3.14.6, which I built myself thinking the issue could just be a bug in the version I'm running. I rebooted after building and installing, and the hung tasks came back 2 minutes after boot. How can I disable bcache for now? The instructions to install it a pretty clear, but disabling it isn't. -- 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
