* [ECOS] Ethernet Communication
@ 2007-11-12 10:39 Alperen Coskun
2007-11-12 10:55 ` Andrew Lunn
0 siblings, 1 reply; 5+ messages in thread
From: Alperen Coskun @ 2007-11-12 10:39 UTC (permalink / raw)
To: ecos discuss
Hi all,
I have two boards running ECOS and I want to create a communication between them via ethernet interface. I'm using UDP sockets. One will send a character buffer in a loop and other will receive it in a loop. (I think everything is clear till here) I wrote a server program and put it in one of the board. I write a client program and run it on Linux. Everything worked as I expected.
BUT, when I put the client program to the other board, everything exploded. If the buffer is sent only one time, no errors occur. But, using it with a loop, client is sending the buffer and server is receiving it but only for 5 times. Then, a 'sendto error' occurs. I examined example programs such as 'udp_lo_test.c'. All the things are same but I didn't understand where the error is. (It gives different errors, ENAMETOOLONG, EHOSTDOWN, sometimes bind error etc.)
Could anyone give a suggestion to me?
Regards...
Alperen
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* Re: [ECOS] Ethernet Communication
2007-11-12 10:39 [ECOS] Ethernet Communication Alperen Coskun
@ 2007-11-12 10:55 ` Andrew Lunn
2007-11-12 13:11 ` Alperen Coskun
[not found] ` <BAY121-W40DA18DB31664E5920D34ACC870@phx.gbl>
0 siblings, 2 replies; 5+ messages in thread
From: Andrew Lunn @ 2007-11-12 10:55 UTC (permalink / raw)
To: Alperen Coskun; +Cc: ecos discuss
> BUT, when I put the client program to the other board, everything
> exploded. If the buffer is sent only one time, no errors occur. But,
> using it with a loop, client is sending the buffer and server is
> receiving it but only for 5 times. Then, a 'sendto error' occurs. I
> examined example programs such as 'udp_lo_test.c'. All the things
> are same but I didn't understand where the error is. (It gives
> different errors, ENAMETOOLONG, EHOSTDOWN, sometimes bind error
> etc.)
This sounds like stack overflow or some other form of data corruption.
Turn on CYG_INFRA_DEBUG and stack checking.
Andrew
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^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: [ECOS] Ethernet Communication
2007-11-12 10:55 ` Andrew Lunn
@ 2007-11-12 13:11 ` Alperen Coskun
[not found] ` <BAY121-W40DA18DB31664E5920D34ACC870@phx.gbl>
1 sibling, 0 replies; 5+ messages in thread
From: Alperen Coskun @ 2007-11-12 13:11 UTC (permalink / raw)
To: Andrew Lunn; +Cc: ecos discuss
Thanks for your reply,
I did what you said and get the following error message:
ASSERT FAIL: dlmalloc.cxx [ 771] void Cyg_Mempool_dlmalloc_Implementation::do_check_chunk() (cyg_uint8 *)p + sz <= (cyg_uint8 *)(((mbinptr)((char*)&(av_[2*(0) + 2]) - 2*(sizeof(Cyg_Mempool_dlmalloc_Implementation::Cyg_dlmalloc_size_t))))->fd)
What do you suggest me doing?
Regards
Alperen
> Date: Mon, 12 Nov 2007 11:55:36 +0100
> From: andrew@lunn.ch
> To: a_a_coskunoc@hotmail.com
> CC: ecos-discuss@ecos.sourceware.org
> Subject: Re: [ECOS] Ethernet Communication
>
>> BUT, when I put the client program to the other board, everything
>> exploded. If the buffer is sent only one time, no errors occur. But,
>> using it with a loop, client is sending the buffer and server is
>> receiving it but only for 5 times. Then, a 'sendto error' occurs. I
>> examined example programs such as 'udp_lo_test.c'. All the things
>> are same but I didn't understand where the error is. (It gives
>> different errors, ENAMETOOLONG, EHOSTDOWN, sometimes bind error
>> etc.)
>
> This sounds like stack overflow or some other form of data corruption.
> Turn on CYG_INFRA_DEBUG and stack checking.
>
> Andrew
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* Re: [ECOS] Ethernet Communication
[not found] ` <BAY121-W40DA18DB31664E5920D34ACC870@phx.gbl>
@ 2007-11-12 13:27 ` Andrew Lunn
2007-11-14 16:15 ` Alperen Coskun
0 siblings, 1 reply; 5+ messages in thread
From: Andrew Lunn @ 2007-11-12 13:27 UTC (permalink / raw)
To: Alperen Coskun; +Cc: ecos discuss
On Mon, Nov 12, 2007 at 03:10:32PM +0200, Alperen Coskun wrote:
>
>
> Thanks for your reply,
>
> I did what you said and get the following error message:
>
> ASSERT FAIL: <5>dlmalloc.cxx [ 771] void Cyg_Mempool_dlmalloc_Implementation::do_check_chunk() (cyg_uint8 *)p + sz <= (cyg_uint8 *)(((mbinptr)((char*)&(av_[2*(0) + 2]) - 2*(sizeof(Cyg_Mempool_dlmalloc_Implementation::Cyg_dlmalloc_size_t))))->fd)
>
> What do you suggest me doing?
So your heap is getting corrupted. Look for a buffer overflow, double
free of a block of memory etc....
Andrew
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^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: [ECOS] Ethernet Communication
2007-11-12 13:27 ` Andrew Lunn
@ 2007-11-14 16:15 ` Alperen Coskun
0 siblings, 0 replies; 5+ messages in thread
From: Alperen Coskun @ 2007-11-14 16:15 UTC (permalink / raw)
To: Andrew Lunn; +Cc: ecos discuss
Andrew,
I looked for what you said and searched for other possible problems but I couldn't find anything. Buffers are large enough and I send only 1 byte each time that means 5x1 byte... I don't know how to check buffer overflow and get rid of this problem. The interesting thing is I send data for 5 times, after that it gives error for 40-50 times, then sends again for 5 times and then again error 40-50 times and so on...
But, big thanks for your advises.
Alperen
> Date: Mon, 12 Nov 2007 14:27:36 +0100
> From: andrew@lunn.ch
> To: a_a_coskunoc@hotmail.com
> CC: ecos-discuss@ecos.sourceware.org
> Subject: Re: [ECOS] Ethernet Communication
>
> On Mon, Nov 12, 2007 at 03:10:32PM +0200, Alperen Coskun wrote:
>>
>>
>> Thanks for your reply,
>>
>> I did what you said and get the following error message:
>>
>> ASSERT FAIL: dlmalloc.cxx [ 771] void Cyg_Mempool_dlmalloc_Implementation::do_check_chunk() (cyg_uint8 *)p + sz <= (cyg_uint8 *)(((mbinptr)((char*)&(av_[2*(0) + 2]) - 2*(sizeof(Cyg_Mempool_dlmalloc_Implementation::Cyg_dlmalloc_size_t))))->fd)
>>
>> What do you suggest me doing?
>
> So your heap is getting corrupted. Look for a buffer overflow, double
> free of a block of memory etc....
>
> Andrew
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2007-11-12 10:39 [ECOS] Ethernet Communication Alperen Coskun
2007-11-12 10:55 ` Andrew Lunn
2007-11-12 13:11 ` Alperen Coskun
[not found] ` <BAY121-W40DA18DB31664E5920D34ACC870@phx.gbl>
2007-11-12 13:27 ` Andrew Lunn
2007-11-14 16:15 ` Alperen Coskun
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