Hi,
I am running a Hauppauge NOVA-S plus (cx2388x based card) and an older
technotrend S-1500 card in the same chassis. Trying to debug other problems I
have turned on lock debugging in the kernel and have started getting the
following dump when both cards are started:
--------------------------------------------------------------------------------------------
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547514]
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547515]
=================================
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547519] [ INFO: inconsistent lock
state ]
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547521] 2.6.23.14 #5
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547523]
---------------------------------
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547525] inconsistent {softirq-on-W} ->
{in-softirq-W} usage.
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547527] startup1.pl/13742
[HC0[0]:SC1[1]:HE1:SE0] takes:
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547532] (&dvbdemux->lock){-+..}, at:
[<f0a10df9>] dvb_dmx_swfilter_packets+0x1f/0x49 [dvb_core]
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547590] {softirq-on-W} state was
registered at:
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547598] [<c0440eb7>]
__lock_acquire+0x4aa/0xc1a
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547615] [<c04416a1>]
lock_acquire+0x7a/0x94
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547682] [<c06339bd>]
_spin_lock+0x2e/0x58
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547712] [<f0a10c8b>]
dvb_dmx_swfilter+0x21/0x104 [dvb_core]
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547737] [<f0d22383>]
videobuf_dvb_thread+0x83/0x105 [video_buf_dvb]
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547752] [<c0435b9c>]
kthread+0x3b/0x63
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547804] [<c0405b9f>]
kernel_thread_helper+0x7/0x10
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547874] [<ffffffff>] 0xffffffff
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547888] irq event stamp: 22178648
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547889] hardirqs last enabled at
(22178648): [<c04298e8>] tasklet_action+0x26/0xa8
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547893] hardirqs last disabled at
(22178647): [<c04298cd>] tasklet_action+0xb/0xa8
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547896] softirqs last enabled at
(22178536): [<c0429889>] __do_softirq+0xe3/0xe9
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547899] softirqs last disabled at
(22178645): [<c0407046>] do_softirq+0x61/0xc7
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547903]
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547903] other info that might help us
debug this:
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547904] no locks held by
startup1.pl/13742.
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547906]
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547906] stack backtrace:
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547908] [<c0405f18>]
show_trace_log_lvl+0x1a/0x2f
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547911] [<c040690a>]
show_trace+0x12/0x14
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547914] [<c0406922>]
dump_stack+0x16/0x18
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547916] [<c043f3b9>]
print_usage_bug+0x140/0x14a
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547919] [<c0440070>]
mark_lock+0x12e/0x45b
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547921] [<c0440e47>]
__lock_acquire+0x43a/0xc1a
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547923] [<c04416a1>]
lock_acquire+0x7a/0x94
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547926] [<c06339bd>]
_spin_lock+0x2e/0x58
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547928] [<f0a10df9>]
dvb_dmx_swfilter_packets+0x1f/0x49 [dvb_core]
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547937] [<f091f73a>]
vpeirq+0xc0/0x130 [budget_core]
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547941] [<c0429915>]
tasklet_action+0x53/0xa8
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547943] [<c0429815>]
__do_softirq+0x6f/0xe9
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547946] [<c0407046>]
do_softirq+0x61/0xc7
Jan 22 11:00:17 TEMERAIRE kernel: [ 218.547948] =======================
Jan 22 11:00:18 TEMERAIRE kernel: [ 219.745305] saa7146_i2c_writeout: timed
out waiting for end of xfer
--------------------------------------------------------------------------------------------
The same dump occurs with different processes named in the line:
"startup1.pl/13742 [HC0[0]:SC1[1]:HE1:SE0] takes:", though the rest is
essentially the same.
Now, I am interpreting this as saying that the demux->lock used in
dvb_dxm_swfilter and dvb_dmx_swfilter_packets has become inconsistent. I think
this has happened because one of the locks was taken from a soft IRQ.
Changing the spinlocks to spin_lock_irqsave/restore on that lock object in
dvb_demux.c has stopped that error message.
I am not an expert in this, but is this the correct interpretation and
resolution? If so, I'll send a patch. If this is not the correct way of fixing
this, does anyone have any suggestions?
This is of course using an SMP kernel and I have a Intel Core2 6700 @ 2.66GHz
processor.
Cheers
Pete
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