From: Kent Overstreet <kent.overstreet@gmail.com>
To: Marcin <marcin@mejor.pl>
Cc: linux-bcache@vger.kernel.org
Subject: Re: [bcachefs][tier] INFO: task bch_tier_read:21414 blocked for more than 120 seconds.
Date: Tue, 11 Oct 2016 17:26:00 -0800 [thread overview]
Message-ID: <20161012012600.s2cq5ac37hwwrp3e@kmo-pixel> (raw)
In-Reply-To: <ebd2b9da9ab215488fd59797d8d1d67d@mejor.pl>
On Tue, Oct 11, 2016 at 11:13:56PM +0200, Marcin wrote:
> Hi!
>
> Kernel at:
> commit 2677d7d38f465ca9c8c33619a46bf4fe2852c39d
> Author: Kent Overstreet <kent.overstreet@gmail.com>
> Date: Mon Oct 10 12:10:48 2016 -0800
>
> Freshly formated two tiered filesystem:
> # bcache format --force --tier 0 /dev/sde1 --tier 1 /dev/sdd1
> --btree_node=262144
> External UUID: f213abd2-2517-4723-a82f-cffed89094f6
> Internal UUID: b6b5409e-e198-43a6-8e2a-49f4ba8c714b
> Label:
> Version: 6
> Block_size: 512
> Btree node size: 256.0K
> Error action: readonly
> Clean: 0
> Metadata replicas: have 1, want 1
> Data replicas: have 1, want 1
> Metadata checksum type: crc32c
> Data checksum type: crc32c
> Compression type: none
> String hash type: siphash
> 32 bit inodes: 0
> GC reserve percentage: 0%
> Root reserve percentage: 0%
> Devices: 2
>
> Device 0:
> UUID: 29916bec-62ce-4d1e-bf3f-d2b72b1e68b2
> bucket_size: 128.0K
> first_bucket: 8
> nbuckets: 81920
> Last mount: (never)
> State: active
> Tier: 0
> Has metadata: 0
> Has data: 0
> Replacement policy: lru
> Discard: 0
>
> Device 1:
> UUID: 84a22c92-c386-42a7-a98d-a4f00e916527
> bucket_size: 256.0K
> first_bucket: 4
> nbuckets: 5723193
> Last mount: (never)
> State: active
> Tier: 1
> [I've got no more in tmux history]
>
>
> While I was copying many small files using mc I got:
> [ 6019.040067] INFO: task bch_tier_read:21414 blocked for more than 120
> seconds.
> [ 6019.040071] Tainted: G W 4.8.0+ #1
> [ 6019.040072] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> this message.
> [ 6019.040073] bch_tier_read D ffff880003a7bbc0 0 21414 2
> 0x00000000
> [ 6019.040079] ffff880003a7bbc0 ffff880036949a80 ffff880000f64f80
> ffff880003a7bc98
> [ 6019.040082] ffff880003a7c000 ffff880003a7bd08 ffff880003a7bcf0
> ffff880003a7bc00
> [ 6019.040085] 0000000000000001 ffff880003a7bbd8 ffffffff81473730
> ffff880003a7bc98
> [ 6019.040089] Call Trace:
> [ 6019.040096] [<ffffffff81473730>] schedule+0x30/0x80
> [ 6019.040128] [<ffffffffa02c7798>] bch_move_ctxt_wait+0x88/0xb0 [bcache]
> [ 6019.040133] [<ffffffff810864c0>] ? wake_atomic_t_function+0x60/0x60
> [ 6019.040152] [<ffffffffa02d5b53>] read_tiering+0x143/0x4c0 [bcache]
> [ 6019.040155] [<ffffffff814732ad>] ? __schedule+0x2cd/0x720
> [ 6019.040172] [<ffffffffa02a959a>] ?
> bch_bucket_stats_read_cache+0xda/0x150 [bcache]
> [ 6019.040191] [<ffffffffa02d6117>] bch_tiering_thread+0x247/0x250 [bcache]
> [ 6019.040210] [<ffffffffa02d5ed0>] ? read_tiering+0x4c0/0x4c0 [bcache]
> [ 6019.040213] [<ffffffff81069f84>] kthread+0xc4/0xe0
> [ 6019.040216] [<ffffffff814779ff>] ret_from_fork+0x1f/0x40
> [ 6019.040219] [<ffffffff81069ec0>] ? kthread_worker_fn+0x160/0x160
You're not the only one who's seeing this, I've been chasing this bug for the
past several days...
next prev parent reply other threads:[~2016-10-12 1:26 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-11 21:13 [bcachefs][tier] INFO: task bch_tier_read:21414 blocked for more than 120 seconds Marcin
2016-10-12 1:26 ` Kent Overstreet [this message]
2016-10-12 11:07 ` Marcin Mirosław
2016-10-12 12:11 ` Kent Overstreet
2016-10-12 19:10 ` Marcin
[not found] ` <CAC7rs0vU1KTsf1KmbCJg3GWLrsKd4aA=j=vCezyBPTuVFxOHQg@mail.gmail.com>
2016-10-12 19:51 ` Marcin
2016-10-15 6:17 ` Kent Overstreet
2016-10-18 0:30 ` Kent Overstreet
2016-10-18 6:07 ` Marcin Mirosław
2016-10-18 6:30 ` Kent Overstreet
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