linux-kernel - bcache blocking ops and lockdep warnings

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Date:	Wed, 10 Dec 2014 06:15:53 +0000
From:	Sitsofe Wheeler <sitsofe@...il.com>
To:	Kent Overstreet <kmo@...erainc.com>, Neil Brown <neilb@...e.de>,
	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: bcache blocking ops and lockdep warnings

Hi,

After doing
make-bcache -B /dev/sdf
make-bcache -C /dev/sdh
ls -l /sys/fs/bcache
echo 1110734d-230c-4b8f-a63d-dff472a0977b > /sys/block/bcache0/bcache/attach

the following warnings were produced with a 3.18.0.x86_64-01967-g86c6a2f
kernel:

[   75.218601] bcache: register_bdev() registered backing device sdf
[   82.616568] bcache: run_cache_set() invalidating existing data
[   82.621589] ------------[ cut here ]------------
[   82.622890] WARNING: CPU: 1 PID: 979 at kernel/sched/core.c:7301 __might_sleep+0x5c/0xa0()
[   82.624344] do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff8155afc8>] bch_allocator_thread+0xd8/0xe30
[   82.625979] CPU: 1 PID: 979 Comm: bcache_allocato Not tainted 3.18.0.x86_64-01967-g86c6a2f #162
[   82.627468] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090006  05/23/2012
[   82.628949]  0000000000000009 ffff8800da963ce8 ffffffff816ea8af 0000000000000001
[   82.634007]  ffff8800da963d38 ffff8800da963d28 ffffffff81073f3c ffff8800da963d28
[   82.639020]  ffffffff819d431c 0000000000000038 0000000000000000 ffff8800e468a680
[   82.643967] Call Trace:
[   82.645045]  [<ffffffff816ea8af>] dump_stack+0x4e/0x68
[   82.646345]  [<ffffffff81073f3c>] warn_slowpath_common+0x7c/0xa0
[   82.647622]  [<ffffffff81073fc6>] warn_slowpath_fmt+0x46/0x50
[   82.648954]  [<ffffffff8155afc8>] ? bch_allocator_thread+0xd8/0xe30
[   82.650338]  [<ffffffff8155afc8>] ? bch_allocator_thread+0xd8/0xe30
[   82.651667]  [<ffffffff810a2e2c>] __might_sleep+0x5c/0xa0
[   82.652959]  [<ffffffff8155b0b7>] bch_allocator_thread+0x1c7/0xe30
[   82.654335]  [<ffffffff8155aef0>] ? bch_invalidate_one_bucket+0x80/0x80
[   82.655672]  [<ffffffff81091a03>] kthread+0x103/0x110
[   82.656939]  [<ffffffff81091900>] ? __kthread_unpark+0x50/0x50
[   82.658294]  [<ffffffff816f43fc>] ret_from_fork+0x7c/0xb0
[   82.659664]  [<ffffffff81091900>] ? __kthread_unpark+0x50/0x50
[   82.660970] ---[ end trace 15295ea1be01c8a2 ]---
[   82.683570] ------------[ cut here ]------------
[   82.684559] WARNING: CPU: 7 PID: 974 at kernel/locking/lockdep.c:712 __lock_acquire+0x21c/0x1c60()
[   82.684559] CPU: 7 PID: 974 Comm: bcache-register Tainted: G        W      3.18.0.x86_64-01967-g86c6a2f #162
[   82.684559] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090006  05/23/2012
[   82.684559]  0000000000000009 ffff8800dac8f988 ffffffff816ea8af 0000000000000000
[   82.684559]  0000000000000000 ffff8800dac8f9c8 ffffffff81073f3c ffff8800dac8f9c8
[   82.684559]  ffffffff82668240 0000000000000000 ffff8800dac3da88 0000000000000001
[   82.684559] Call Trace:
[   82.684559]  [<ffffffff816ea8af>] dump_stack+0x4e/0x68
[   82.684559]  [<ffffffff81073f3c>] warn_slowpath_common+0x7c/0xa0
[   82.684559]  [<ffffffff8107403a>] warn_slowpath_null+0x1a/0x20
[   82.684559]  [<ffffffff810c0d5c>] __lock_acquire+0x21c/0x1c60
[   82.684559]  [<ffffffff813b24ae>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[   82.684559]  [<ffffffff810d624f>] ? rcu_irq_exit+0x8f/0xb0
[   82.684559]  [<ffffffff810c2706>] ? __lock_acquire+0x1bc6/0x1c60
[   82.684559]  [<ffffffff810c305c>] lock_acquire+0xfc/0x150
[   82.684559]  [<ffffffff8156346c>] ? mca_reap+0x6c/0x170
[   82.684559]  [<ffffffff810bc131>] down_write_trylock+0x61/0x80
[   82.684559]  [<ffffffff8156346c>] ? mca_reap+0x6c/0x170
[   82.684559]  [<ffffffff8156346c>] mca_reap+0x6c/0x170
[   82.684559]  [<ffffffff81563900>] mca_alloc+0xe0/0x4b0
[   82.684559]  [<ffffffff81564893>] __bch_btree_node_alloc+0xb3/0x240
[   82.684559]  [<ffffffff815760da>] run_cache_set+0x6ea/0x950
[   82.684559]  [<ffffffff8123fc6e>] ? kernfs_add_one+0x10e/0x160
[   82.684559]  [<ffffffff815780cf>] register_bcache+0x167f/0x19e0
[   82.684559]  [<ffffffff813a6bcf>] kobj_attr_store+0xf/0x20
[   82.684559]  [<ffffffff812419a8>] sysfs_kf_write+0x48/0x60
[   82.684559]  [<ffffffff81241247>] kernfs_fop_write+0xe7/0x170
[   82.684559]  [<ffffffff811cde6b>] vfs_write+0xcb/0x1d0
[   82.684559]  [<ffffffff816f50dc>] ? retint_swapgs+0x13/0x1b
[   82.684559]  [<ffffffff811ce069>] SyS_write+0x49/0xb0
[   82.684559]  [<ffffffff816f44a9>] system_call_fastpath+0x12/0x17
[   82.684559] ---[ end trace 15295ea1be01c8a3 ]---
[   82.763919] bcache: register_cache() registered cache device sdh

-- 
Sitsofe | http://sucs.org/~sits/
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