[Dev] [SDK/Emulator] Emulator kernel upgrade is postponed and other issues...

Stanislav Vorobiov s.vorobiov at samsung.com
Thu Apr 24 09:34:53 GMT 2014


Hi,

Ok, so guest kernel debugging shows this on hang:

(gdb) target remote :1234
Remote debugging using :1234
azx_pcm_trigger (substream=0xc0014600, cmd=1) at sound/pci/hda/hda_intel.c:2297
2297    sound/pci/hda/hda_intel.c: No such file or directory.
(gdb) bt
#0  azx_pcm_trigger (substream=0xc0014600, cmd=1) at sound/pci/hda/hda_intel.c:2297
#1  0xc143f0a9 in snd_pcm_do_start (substream=<optimized out>, state=<optimized out>) at sound/core/pcm_native.c:866
#2  0xc143f016 in snd_pcm_action_single (ops=0xc18c6848 <snd_pcm_action_start>, substream=0xc0014600, state=3)
    at sound/core/pcm_native.c:774
#3  0xc14406f5 in snd_pcm_action_lock_irq (ops=0xc18c6848 <snd_pcm_action_start>, substream=0xc0014600, state=3)
    at sound/core/pcm_native.c:823
#4  0xc1441730 in snd_pcm_common_ioctl1 (file=0xdd359640, substream=0xc0014600, cmd=<optimized out>, arg=0xb1f17218)
    at sound/core/pcm_native.c:2576
#5  0xc144263b in snd_pcm_playback_ioctl1 (file=<optimized out>, substream=0xc0014600, cmd=<optimized out>, arg=0xb1f17218)
    at sound/core/pcm_native.c:2691
#6  0xc1442668 in snd_pcm_playback_ioctl (file=<optimized out>, cmd=<optimized out>, arg=<optimized out>)
    at sound/core/pcm_native.c:2784
#7  0xc10d2587 in vfs_ioctl (arg=2985390616, cmd=<optimized out>, filp=0xdd359640) at fs/ioctl.c:43
#8  do_vfs_ioctl (filp=0xdd359640, fd=<optimized out>, cmd=<optimized out>, arg=2985390616) at fs/ioctl.c:598
#9  0xc10d2604 in SYSC_ioctl (arg=2985390616, cmd=16706, fd=29) at fs/ioctl.c:613
#10 SyS_ioctl (fd=29, cmd=16706, arg=-1309576680) at fs/ioctl.c:604

and hda_intel.c:2297 is:

	if (start) {
		/* wait until all FIFOs get ready */
		for (timeout = 5000; timeout; timeout--) {
			nwait = 0;
			snd_pcm_group_for_each_entry(s, substream) {
				if (s->pcm->card != substream->pcm->card)
					continue;
				azx_dev = get_azx_dev(s);
				if (!(azx_sd_readb(azx_dev, SD_STS) &
				      SD_STS_FIFO_READY))
					nwait++;
			}
			if (!nwait)
				break;
			cpu_relax();
		}
	} else {

the problematic part is:

if (!(azx_sd_readb(azx_dev, SD_STS) &
SD_STS_FIFO_READY))

So I guess this is indeed related to audio, I hope to provide fix soon...

On 04/23/2014 03:26 PM, Stanislav Vorobiov wrote:
> Hi, SeokYeon
> 
> I think I found the cause of this problem, try removing "-soundhw all" from your qemu command line, it should work.
> It turned out I had it removed all along, but when I put it back I get a kernel hang.
> 
> There must be some problems handling sound with new kernel, I'll try to find out what they are...
> 
> On 04/23/2014 06:12 AM, SeokYeon Hwang wrote:
>> Sorry for my late reply.
>>
>> A mail server was malfunction till yesterday.
>>
>> Thekernel load time I meantwas"afterkernel loading->before init start" time.
>>
>> [    0.000000] Initializing cgroup subsys cpuset[    0.000000] Initializing cgroup subsys cpu...
>>
>> ...
>>
>> ...
>>
>> Image mount[   12.729651] kjournald starting.  Commit interval 5 seconds[   12.731320] EXT3-fs (vda): using internal journal[   12.732636] EXT3-fs (vda): recovery complete[   12.733517] EXT3-fs (vda): mounted filesystem with writeback data mode***[  
>> 12.734886]*mount used greatest stack depth: 6132 bytes leftcreate device filesystemSwitching root
>>
>> I meant“12.734886”seconds.
>>
>> Itmightbenot related with 3.12 kernel hang-up issue.
>>
>> But I’mcuriouswhy“HAX enabled”is much slowerthan“HAX disabled”.
>>
>> Back to the hang-up issue, it is notpermanenthang-up.
>>
>> It proceedsafter 5 minutes ~ 15 minutes.
>>
>> But kernel time is passingonlyfew milliseconds.
>>
>> It might bea potential critical problemwhateverkernel version is, so I hope to figure out cause of this, ASAP.
>>
>> Thanks.
>>
>> -----Original Message-----
>> From:Stanislav Vorobiov [mailto:s.vorobiov at samsung.com]
>> Sent:Friday, April 18, 2014 4:07 PM
>> To:SeokYeon Hwang; dev at lists.tizen.org; 'Ji, John'; ritu.sood at intel.com
>> Subject:Re: [Dev] [SDK/Emulator] Emulator kernel upgrade is postponed and other issues...
>>
>> Hi,
>>
>>> How long kernel load time (after kernel loading -> before "init" 
>>
>>> starts) at your Windows PC with HAX enabled and HAX disabled ??
>>
>> How do you measure the time between kernel loading and init start ? Do you modify guest filesystem somehow ?
>>
>> I've measured time from emulator startup to UI, it's 20-22secs with HAX and about 2m 20secs without HAX
>>
>> On 04/18/2014 10:41 AM, SeokYeon Hwang wrote:
>>
>>> Yes, It can reproduce even with g_poll patch.
>>
>>> We can reproduce it on most of Windows PCs. It may be timing issues 
>>
>>> depend on PC's performance, ...
>>
>>>
>>
>>> How long kernel load time (after kernel loading -> before "init" 
>>
>>> starts) at your Windows PC with HAX enabled and HAX disabled ??
>>
>>>
>>
>>> -----Original Message-----
>>
>>> From: Stanislav Vorobiov [mailto:s.vorobiov at samsung.com]
>>
>>> Sent: Friday, April 18, 2014 2:59 PM
>>
>>> To: SeokYeon Hwang;dev at lists.tizen.org<mailto:dev at lists.tizen.org>; 'Ji, John';
>>
>>> ritu.sood at intel.com<mailto:ritu.sood at intel.com>
>>
>>> Subject: Re: [Dev] [SDK/Emulator] Emulator kernel upgrade is postponed
>>
>>> and other issues...
>>
>>>
>>
>>> Hi, SeokYeon
>>
>>>
>>
>>> This happens even withhttps://review.tizen.org/gerrit/#/c/19414/right ?
>>
>>>
>>
>>> Before that patch kernel 3.12 didn't boot at all, but now it boots 
>>
>>> every time (fast) and I can't reproduce this hang...
>>
>>>
>>
>>> Also, regarding boot delays with HAX, I do experience them on mac os 
>>
>>> x, I'm not sure if it's related though...
>>
>>>
>>
>>> On 04/18/2014 08:11 AM, SeokYeon Hwang wrote:
>>
>>>> I'll postpone to apply 3.12 linux kernel to tizen because of a big
>>
>>> problem.
>>
>>>>
>>
>>>> The problem is that the hang happens for a certain period of time 
>>
>>>> (several
>>
>>> minutes) when booting in many Windows PC.
>>
>>>>
>>
>>>> Until resolving the problem, I'll postpone it.
>>
>>>>
>>
>>>>  
>>
>>>>
>>
>>>> We need a help to resolve it, especially from HAX developers. 
>>
>>>>
>>
>>>> Because it happens when running with turned on VT acceleration with HAX.
>>
>>>>
>>
>>>> The other fact is that guest kernel time is stopped.
>>
>>>>
>>
>>>> Please treat this with a higher priority.
>>
>>>>
>>
>>>> The HAX may not be the cause of the problem. However, it will be very
>>
>>> helpful if HAX developers help me.
>>
>>>>
>>
>>>>  
>>
>>>>
>>
>>>> Also, I have a question about HAX.
>>
>>>>
>>
>>>> Why does the running with disabled HAX be the faster than the running 
>>
>>>> with
>>
>>> enabled HAX for the time (loading kernel -> starting init) in Windows?
>>
>>>>
>>
>>>> It can affect the overall performance in Windows, so please check 
>>
>>>> this
>>
>>> performance issue.
>>
>>>>
>>
>>>>  
>>
>>>>
>>
>>>> Thanks.
>>
>>>>
>>
>>>>
>>
>>>>
>>
>>>> _______________________________________________
>>
>>>> Dev mailing list
>>
>>>> Dev at lists.tizen.org<mailto:Dev at lists.tizen.org>
>>
>>>> https://lists.tizen.org/listinfo/dev
>>
>>>>
>>
>>>
>>
>>>
>>
> 



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