Re: BUG: soft lockup when recording audio on MX28EVK with ASoC sgtl5000

From: Hector Palacios
Date: Mon Mar 25 2013 - 12:54:03 EST

On 03/25/2013 04:25 PM, Shawn Guo wrote:
On Mon, Mar 25, 2013 at 01:10:54PM +0100, Marek Vasut wrote:
Dear Hector Palacios,

CCing Shawn, this might also explain the touchscreen issue.

Hello,

I just tried recording audio on Freescale's MX28EVK that uses ASoC sgtl5000
(kernel v3.8) with:

arecord -M -f cd sound.wav --duration 10

and got a scheduler message:

[ 789.041847] [sched_delayed] sched: RT throttling activated

Hmm, I'm not sure if v3.8 is the first place where audio recording gets
broken. Does v3.7 even work for you?

No it doesn't. Same issue. Apparently a little different order (first the 'BUG soft lockup', then the 'sched: RT throttling activated')

~# arecord -M -f cd sound.wav --duration 10
Recording WAVE 'sound.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
overrun!!! (at least 0.063 ms long)
[ 188.070000] BUG: soft lockup - CPU#0 stuck for 23s! [arecord:230]
[ 188.070000] Modules linked in:
[ 188.070000] irq event stamp: 2318718
[ 188.070000] hardirqs last enabled at (2318717): [<c000ee68>] __irq_svc+0x48/0x54
[ 188.070000] hardirqs last disabled at (2318718): [<c000ee54>] __irq_svc+0x34/0x54
[ 188.070000] softirqs last enabled at (2317860): [<c0025e98>] __do_softirq+0x13c/0x220
[ 188.070000] softirqs last disabled at (2317847): [<c002606c>] irq_exit+0x8c/0x94
[ 188.070000]
[ 188.070000] Pid: 230, comm: arecord
[ 188.070000] CPU: 0 Not tainted (3.7.0-00027-g46709ea-dirty #8)
[ 188.070000] PC is at __flush_whole_cache+0x4/0x18
[ 188.070000] LR is at unmap_kernel_range+0x10/0x2c
[ 188.070000] pc : [<c001a048>] lr : [<c00c30d4>] psr: 00000013
[ 188.070000] sp : cf7b3e68 ip : 00000000 fp : 00000000
[ 188.070000] r10: 00040000 r9 : cf6d4e00 r8 : c061a7dc
[ 188.070000] r7 : d0804000 r6 : d0940000 r5 : d0944000 r4 : d0940000
[ 188.070000] r3 : 20000008 r2 : 00000004 r1 : 00004000 r0 : d0940000
[ 188.070000] Flags: nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 188.070000] Control: 0005317f Table: 4ec2c000 DAC: 00000015
[ 188.070000] [<c00151ac>] (unwind_backtrace+0x0/0xf4) from [<c006bd84>] (watchdog_timer_fn+0x128/0x168)
[ 188.070000] [<c006bd84>] (watchdog_timer_fn+0x128/0x168) from [<c00422cc>] (__run_hrtimer+0x7c/0x1e8)
[ 188.070000] [<c00422cc>] (__run_hrtimer+0x7c/0x1e8) from [<c00427e4>] (hrtimer_interrupt+0x110/0x310)
[ 188.070000] [<c00427e4>] (hrtimer_interrupt+0x110/0x310) from [<c001a780>] (mxs_timer_interrupt+0x1c/0x28)
[ 188.070000] [<c001a780>] (mxs_timer_interrupt+0x1c/0x28) from [<c006c404>] (handle_irq_event_percpu+0x5c/0x26c)
[ 188.070000] [<c006c404>] (handle_irq_event_percpu+0x5c/0x26c) from [<c006c650>] (handle_irq_event+0x3c/0x5c)
[ 188.070000] [<c006c650>] (handle_irq_event+0x3c/0x5c) from [<c006ec14>] (handle_level_irq+0x8c/0x118)
[ 188.070000] [<c006ec14>] (handle_level_irq+0x8c/0x118) from [<c006c398>] (generic_handle_irq+0x28/0x30)
[ 188.070000] [<c006c398>] (generic_handle_irq+0x28/0x30) from [<c00100fc>] (handle_IRQ+0x30/0x84)
[ 188.070000] [<c00100fc>] (handle_IRQ+0x30/0x84) from [<c00086ec>] (icoll_handle_irq+0x30/0x44)
[ 188.070000] [<c00086ec>] (icoll_handle_irq+0x30/0x44) from [<c000ee64>] (__irq_svc+0x44/0x54)
[ 188.070000] Exception stack(0xcf7b3e20 to 0xcf7b3e68)
[ 188.070000] 3e20: d0940000 00004000 00000004 20000008 d0940000 d0944000 d0940000 d0804000
[ 188.070000] 3e40: c061a7dc cf6d4e00 00040000 00000000 00000000 cf7b3e68 c00c30d4 c001a048
[ 188.070000] 3e60: 00000013 ffffffff
[ 188.070000] [<c000ee64>] (__irq_svc+0x44/0x54) from [<c001a048>] (__flush_whole_cache+0x4/0x18)
[ 188.070000] [<c001a048>] (__flush_whole_cache+0x4/0x18) from [<cf76f900>] (0xcf76f900)
[ 215.620000] [sched_delayed] sched: RT throttling activated

--
Héctor Palacios
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