It looks like the bcache branch (3.6.0-rc3) hangs when registering a
cache device. I don't have that issue with the 3.2 branch.
[root@test0 ~]# echo /dev/sdb1 >
/sys/fs/bcache/register
[ 143.221306] bcache: invalidating existing
data
[ 203.136484] INFO: rcu_sched self-detected stall on CPU { 0} (t=60000
jiffies
)
[ 203.144151] Pid: 83, comm: kworker/0:1 Not tainted 3.6.0-rc3+
#7
[ 203.150254] Call
Trace:
[ 203.152807] <IRQ> [<ffffffff810d8b34>]
rcu_check_callbacks+0x184/0x700
[ 203.159753] [<ffffffff81060928>]
update_process_times+0x48/0x90
[ 203.165861] [<ffffffff8109bfc3>]
tick_sched_timer+0x63/0x170
[ 203.171710] [<ffffffff81078063>]
__run_hrtimer+0x73/0x200
[ 203.177298] [<ffffffff8109bf60>] ?
tick_init_highres+0x20/0x20
[ 203.183318] [<ffffffff8109597c>] ?
ktime_get_update_offsets+0x4c/0xd0
[ 203.189947] [<ffffffff81057c62>] ?
__do_softirq+0x122/0x270
[ 203.195709] [<ffffffff810787e7>]
hrtimer_interrupt+0x117/0x260
[ 203.201732] [<ffffffff8158f4bc>] ?
call_softirq+0x1c/0x30
[ 203.207321] [<ffffffff8143a1f0>] ?
bch_bucket_add_unused+0xe0/0xe0
[ 203.213690] [<ffffffff8158fdf9>]
smp_apic_timer_interrupt+0x69/0x99
[ 203.220145] [<ffffffff8158edca>]
apic_timer_interrupt+0x6a/0x70
[ 203.226246] <EOI> [<ffffffff81439c31>] ?
can_invalidate_bucket+0x31/0x40
[ 203.233361] [<ffffffff8143a6a4>] ?
bch_allocator_thread+0x4b4/0xef0
[ 203.239815] [<ffffffff81074480>] ?
add_wait_queue+0x60/0x60
[ 203.245574] [<ffffffff8143a1f0>] ?
bch_bucket_add_unused+0xe0/0xe0
[ 203.251941] [<ffffffff8106d00a>]
process_one_work+0x13a/0x590
[ 203.257872] [<ffffffff8106e6f1>]
worker_thread+0x191/0x500
[ 203.263543] [<ffffffff8106e560>] ?
manage_workers+0x2d0/0x2d0
[ 203.269476] [<ffffffff81073b13>]
kthread+0x93/0xa0
[ 203.274454] [<ffffffff8158f3c4>]
kernel_thread_helper+0x4/0x10
[ 203.280472] [<ffffffff81073a80>] ?
flush_kthread_worker+0xb0/0xb0
[ 203.286753] [<ffffffff8158f3c0>] ? gs_change+0x13/0x13
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