Re: Stale bcache (writethrough) leading to cache being disabled.

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Hi,

arggh. seems the mail reader decided to wrap things a bit too hard.

The kernel-messages are:

The specific kernel message when it disables itself is:

2014-03-25T23:55:03.525100+00:00 machine1 kernel: [6822460.984018]
bcache: error on 5acb2ff8-db07-4d13-a6ca-dbfdbf1d87eb: key too stale:
97, need_gc 97, disabling caching

The potentially root cause message is:

2014-03-24T13:47:34.973100+00:00 machine1 kernel: [6699681.169256]
WARNING: CPU: 5 PID: 293092 at
/home/thorkild/kernel-w-bcace/drivers/md/bcache/alloc.c:80
bch_inc_gen+0x9a/0xe0 [bcache]()
2014-03-24T13:47:34.973104+00:00 machine1 kernel: [6699681.169258]
Modules linked in: iptable_nat nf_nat_ipv4 nf_nat xt_LOG xt_limit
xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_set xt_conntrack
nf_conntrack iptable_filter ip_tables x_tables ip_set_hash_ip ip_set
nfnetlink ipip ip_tunnel tunnel4 eeepc_wmi asus_wmi sparse_keymap
mei_me serio_raw video mei mac_hid lpc_ich wmi lp parport bcache
raid10 raid456 async_pq async_xor async_memcpy async_raid6_recov
async_tx raid1 raid0 multipath linear btrfs raid6_pq e1000e ahci
libahci ptp pps_core xor zlib_deflate
2014-03-24T13:47:34.973106+00:00 machine1 kernel: [6699681.169277]
CPU: 5 PID: 293092 Comm: kworker/5:0 Not tainted 3.11.10-15-generic
#23~f5
2014-03-24T13:47:34.973130+00:00 machine1 kernel: [6699681.169278]
Hardware name: System manufacturer System Product Name/P8B WS, BIOS
2106 07/16/2012
2014-03-24T13:47:34.973131+00:00 machine1 kernel: [6699681.169283]
Workqueue: bcache bch_journal [bcache]
2014-03-24T13:47:34.973132+00:00 machine1 kernel: [6699681.169284]
0000000000000050 ffff88028e3dba98 ffffffff8173bc0e 0000000000000007
2014-03-24T13:47:34.973133+00:00 machine1 kernel: [6699681.169286]
0000000000000000 ffff88028e3dbad8 ffffffff810653ac ffff88028e3dbad8
2014-03-24T13:47:34.973134+00:00 machine1 kernel: [6699681.169288]
ffffc90007764bbc ffff8807f34b6000 000007ffffffffff 0000000000000000
2014-03-24T13:47:34.973134+00:00 machine1 kernel: [6699681.169290] Call Trace:
2014-03-24T13:47:34.973136+00:00 machine1 kernel: [6699681.169294]
[<ffffffff8173bc0e>] dump_stack+0x46/0x58
2014-03-24T13:47:34.973137+00:00 machine1 kernel: [6699681.169297]
[<ffffffff810653ac>] warn_slowpath_common+0x8c/0xc0
2014-03-24T13:47:34.973138+00:00 machine1 kernel: [6699681.169299]
[<ffffffff810653fa>] warn_slowpath_null+0x1a/0x20
2014-03-24T13:47:34.973139+00:00 machine1 kernel: [6699681.169302]
[<ffffffffa01d033a>] bch_inc_gen+0x9a/0xe0 [bcache]
2014-03-24T13:47:34.973140+00:00 machine1 kernel: [6699681.169304]
[<ffffffff81743ae9>] ? mutex_lock+0x39/0x41
2014-03-24T13:47:34.973140+00:00 machine1 kernel: [6699681.169308]
[<ffffffffa01d2b48>] btree_node_free+0x138/0x210 [bcache]
2014-03-24T13:47:34.973141+00:00 machine1 kernel: [6699681.169311]
[<ffffffffa01d78a1>] btree_split+0x3f1/0x740 [bcache]
2014-03-24T13:47:34.973142+00:00 machine1 kernel: [6699681.169315]
[<ffffffffa01dc509>] ? bch_btree_iter_next_filter+0x39/0x50 [bcache]
2014-03-24T13:47:34.973143+00:00 machine1 kernel: [6699681.169318]
[<ffffffffa01d7feb>] bch_btree_insert_recurse+0x3fb/0x510 [bcache]
2014-03-24T13:47:34.973144+00:00 machine1 kernel: [6699681.169322]
[<ffffffffa01d7f78>] bch_btree_insert_recurse+0x388/0x510 [bcache]
2014-03-24T13:47:34.973145+00:00 machine1 kernel: [6699681.169325]
[<ffffffffa01d8256>] bch_btree_insert+0x156/0x330 [bcache]
2014-03-24T13:47:34.973146+00:00 machine1 kernel: [6699681.169330]
[<ffffffffa01e490a>] bch_btree_insert_async+0x1a/0xe0 [bcache]
2014-03-24T13:47:34.973147+00:00 machine1 kernel: [6699681.169333]
[<ffffffffa01df429>] bch_journal+0x49/0x300 [bcache]
2014-03-24T13:47:34.973147+00:00 machine1 kernel: [6699681.169336]
[<ffffffff81081060>] process_one_work+0x170/0x4a0
2014-03-24T13:47:34.973148+00:00 machine1 kernel: [6699681.169338]
[<ffffffff81082121>] worker_thread+0x121/0x390
2014-03-24T13:47:34.973149+00:00 machine1 kernel: [6699681.169339]
[<ffffffff81082000>] ? manage_workers.isra.21+0x170/0x170
2014-03-24T13:47:34.973150+00:00 machine1 kernel: [6699681.169342]
[<ffffffff81088fe0>] kthread+0xc0/0xd0
2014-03-24T13:47:34.973151+00:00 machine1 kernel: [6699681.169343]
[<ffffffff81088f20>] ? flush_kthread_worker+0xb0/0xb0
2014-03-24T13:47:34.973151+00:00 machine1 kernel: [6699681.169346]
[<ffffffff817508ac>] ret_from_fork+0x7c/0xb0
2014-03-24T13:47:34.973152+00:00 machine1 kernel: [6699681.169348]
[<ffffffff81088f20>] ? flush_kthread_worker+0xb0/0xb0
2014-03-24T13:47:34.973153+00:00 machine1 kernel: [6699681.169349]
---[ end trace 9b2a76687ddee9b0 ]---

-- 
Thorkild
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