[Freeswitch-users] Debian packages for ARM/MIPS/POWERPC

[Stanislav Sinyagin]

if coredumps are not made, you need to enable them, and then install
debug symbols (-dbg packages), and run gdb on the core fule. Then it
shoul dindicate the line number in the sources where it crashed.

Here's one suspect: mod_spandsp_fax.c, mod_spandsp_fax_process_fax:

      int16_t *buf = NULL;
....
        buf = switch_core_session_alloc(session,
SWITCH_RECOMMENDED_BUFFER_SIZE);

are we guaranteed that alloc returns a 16-bit aligned pointer?

I think it makes sense to open a jira ticket anyway






On Thu, Dec 10, 2015 at 10:51 PM, Komar, Jason <jkomar at jbox.ca> wrote:
> This is on FreeSWITCH Version 1.6.5+git-20151209T192325Z~70b8c17763~32bit
> (git 70b8c17 2015-12-09 19:23:25Z 32bit) by the way.
>
>
> On Thu, Dec 10, 2015 at 2:49 PM, Komar, Jason <jkomar at jbox.ca> wrote:
>>
>> I get nothing in debug or sip trace. It always dies at mod_spandsp_fax so
>> I figured it was in that module. At that point freeswitch just restarts
>> without throwing any errors.
>>
>> Kernel log shows:
>>
>> Dec 10 14:16:17 antman kernel: [ 5949.832802] Alignment trap: not handling
>> instruction ecb17a01 at [<b44fe32c>]
>> Dec 10 14:16:17 antman kernel: [ 5949.834290] Unhandled fault: alignment
>> exception (0x001) at 0xb4546e4a
>>
>> The only part of the exception that is the same every time it happens is
>> "instruction ecb17a01."
>>
>> I would have just opened a JIRA, but I didn't think this was enough
>> information. I have been Googling trying to figure out how to get more info.
>>
>> Jason
>>
>>
>> On Thu, Dec 10, 2015 at 2:37 PM, Stanislav Sinyagin <ssinyagin at gmail.com>
>> wrote:
>>>
>>> Hi, I didn't see any errors, but I'm not using fax, and mostly it's
>>> bridging the calls and connecting users to a conference. Do you have more
>>> debugging information?
>>>
>>> Most probably the source of the problem is that x86 allows unaligned
>>> memory access: a word pointer can have any value. And other architectures
>>> don't allow this, and require the pointers to be aligned to word boundaries.
>>> Mongodb, for example, is known to fail on any non-x86 CPU because of that.
>>>
>>> So, probably mod_spandsp needs an audit.
>>>
>>> On 10 Dec 2015 21:11, "Komar, Jason" <jkomar at jbox.ca> wrote:
>>>>
>>>> Your instructions worked great for me building on/for my Odroid-U3 (arm)
>>>> running Debian Jessie.
>>>>
>>>> I know you are running on arm at scaleway. Do you ever run into any
>>>> alignment issues? I'm getting alignment exception faults receiving faxes and
>>>> I'm having trouble pulling any useful debug messages.
>>>>
>>>> Thanks,
>>>> Jason
>>>>
>>>> On Mon, Nov 30, 2015 at 9:27 AM, Stanislav Sinyagin
>>>> <ssinyagin at gmail.com> wrote:
>>>>>
>>>>> hi,
>>>>>
>>>>> I put together the build scenario that I tested for ARM (armhf at
>>>>> scaleway.com), and it should also work for other architectures:
>>>>>
>>>>>
>>>>> https://freeswitch.org/confluence/display/FREESWITCH/Building+debs+for+other+architectures
>>>>>
>>>>> It will be great if someone tests them on other architectures too.
>>>>>
>>>>>
>>>>> cheers,
>>>>> stanislav
>>>>>
>>>>>
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>>>>
>>>>
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>
>
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>
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