2011-02-25 04:57:31     USB issue? Streaming data over USB Modem

2011-02-25 04:57:31     USB issue? Streaming data over USB Modem

Richard Aldrich (UNITED KINGDOM)

Message: 98438   

Hi. I am using a USB modem using a modified option.c driver.

I am running PPPD and all is working fine most of the time. I am stream data to a server over a HSPA+ connection, and getting good speeds.

Howver, after a while of streaming, my program crashes a prints the following. It looks to me like a bug in the usb, but I wondered if someone could confirm what the log means.

Any help much appreciated.

- Richard.

LOG::

Data access misaligned address violation

<5> - Attempted misaligned data memory or data cache access.

Kernel OOPS in progress

Deferred Exception context

CURRENT PROCESS:

COMM=ksoftirqd/0 PID=3  CPU=0

invalid mm

return address: [0x00131d26]; contents of:

0x00131d00:  0025  5008  e620  0016  6200  5482  0c02  1c07

0x00131d10:  e14a  001d  e10a  39a0  9110  0040  0000  e51d

0x00131d20:  001e  e560  00a6 [9728] e560  00a0  b468  a138

0x00131d30:  c604  4000  c681  83c0  c681  8040  5608  b068

ADSP-BF537-0.2 500(MHz CCLK) 100(MHz SCLK) (mpu off)

Linux version 2.6.34.7-ADI-2010R1 (root@linux-fqgd) (gcc version 4.3.5 (ADI-2010R1-RC4) ) #59 Tue Feb 8 10:09:48 GMT 2011

SEQUENCER STATUS:        Not tainted

SEQSTAT: 00000024  IPEND: 8008  IMASK: ffff  SYSCFG: 0006

  EXCAUSE   : 0x24

  physical IVG3 asserted : <0xffa007d8> { _trap + 0x0 }

  physical IVG15 asserted : <0xffa010bc> { _evt_system_call + 0x0 }

  logical irq   6 mapped  : <0xffa003ec> { _bfin_coretmr_interrupt + 0x0 }

  logical irq  10 mapped  : <0x000fcc9c> { _bfin_rtc_interrupt + 0x0 }

  logical irq  18 mapped  : <0x000a9e88> { _bfin_serial_dma_rx_int + 0x0 }

  logical irq  19 mapped  : <0x000a9be0> { _bfin_serial_dma_tx_int + 0x0 }

  logical irq  24 mapped  : <0x000d097c> { _bfin_mac_interrupt + 0x0 }

  logical irq  54 mapped  : <0x000da198> { _usb_hcd_irq + 0x0 }

RETE: <0x00000000> /* Maybe null pointer? */

RETN: <0x01023ccc> /* kernel dynamic memory (maybe user-space) */

RETX: <0x00000480> /* Maybe fixed code section */

RETS: <0x00131cd2> { _tcp_transmit_skb + 0xca }

PC  : <0x00131d26> { _tcp_transmit_skb + 0x11e }

DCPLB_FAULT_ADDR: <0x01a662fe> /* kernel dynamic memory (maybe user-space) */

ICPLB_FAULT_ADDR: <0x00131d26> { _tcp_transmit_skb + 0x11e }

PROCESSOR STATE:

R0 : 00004f89    R1 : 000003a1    R2 : 0000ffc0    R3 : 00000000

R4 : 93b48960    R5 : 01023cdc    R6 : 00000020    R7 : 00000001

P0 : 008a2060    P1 : 01a67558    P2 : 001d39a0    P3 : 01a67540

P4 : 008a2060    P5 : 01a662ff    FP : 01a67558    SP : 01023bf0

LB0: ffa0179c    LT0: ffa0179a    LC0: 00000000

LB1: 00102482    LT1: 00102482    LC1: 00000000

B0 : 0f000000    L0 : 00000000    M0 : 00000008    I0 : 01a674e8

B1 : 00000000    L1 : 00000000    M1 : 00000000    I1 : 001d09a8

B2 : 00000000    L2 : 00000000    M2 : 00000000    I2 : ffffffff

B3 : 00000000    L3 : 00000000    M3 : 00000000    I3 : 01a490aa

A0.w: 001f76d3   A0.x: 00000000   A1.w: 000006d3   A1.x: 00000000

USP : 00000000  ASTAT: 02003004

Hardware Trace:

   0 Target : <0x00003eec> { _trap_c + 0x0 }

     Source : <0xffa0076c> { _exception_to_level5 + 0xa4 } CALL pcrel

   1 Target : <0xffa006c8> { _exception_to_level5 + 0x0 }

     Source : <0xffa0057c> { _bfin_return_from_exception + 0x20 } RTX

   2 Target : <0xffa0055c> { _bfin_return_from_exception + 0x0 }

     Source : <0xffa00620> { _ex_trap_c + 0x74 } JUMP.S

   3 Target : <0xffa005ac> { _ex_trap_c + 0x0 }

     Source : <0xffa00840> { _trap + 0x68 } JUMP (P4)

   4 Target : <0xffa007f6> { _trap + 0x1e }

     Source : <0xffa007f2> { _trap + 0x1a } IF CC JUMP pcrel

   5 Target : <0xffa007d8> { _trap + 0x0 }

      FAULT : <0x00131d26> { _tcp_transmit_skb + 0x11e } W[P5] = R0  (Z)

     Source : <0x00131d22> { _tcp_transmit_skb + 0x11a } R0 = W[P4 + -0x18](X)

   6 Target : <0x00131ce6> { _tcp_transmit_skb + 0xde }

     Source : <0x00131ce0> { _tcp_transmit_skb + 0xd8 } IF CC JUMP pcrel

   7 Target : <0x00131cd2> { _tcp_transmit_skb + 0xca }

     Source : <0x00103452> { _skb_push + 0x2e } RTS

   8 Target : <0x00103424> { _skb_push + 0x0 }

     Source : <0x00131cce> { _tcp_transmit_skb + 0xc6 } CALL pcrel

   9 Target : <0x00131cca> { _tcp_transmit_skb + 0xc2 }

     Source : <0x00131cb8> { _tcp_transmit_skb + 0xb0 } IF !CC JUMP pcrel (BP)

  10 Target : <0x00131c9e> { _tcp_transmit_skb + 0x96 }

     Source : <0x00131296> { _tcp_established_options + 0x4e } RTS

  11 Target : <0x00131248> { _tcp_established_options + 0x0 }

     Source : <0x00131c9a> { _tcp_transmit_skb + 0x92 } JUMP.L

  12 Target : <0x00131c8e> { _tcp_transmit_skb + 0x86 }

     Source : <0x00131c8a> { _tcp_transmit_skb + 0x82 } IF CC JUMP pcrel (BP)

  13 Target : <0x00131c70> { _tcp_transmit_skb + 0x68 }

     Source : <0x00131c6c> { _tcp_transmit_skb + 0x64 } IF !CC JUMP pcrel (BP)

  14 Target : <0x00131c68> { _tcp_transmit_skb + 0x60 }

     Source : <0x00102640> { ___skb_clone + 0xbc } RTS

  15 Target : <0x0010259c> { ___skb_clone + 0x18 }

     Source : <0x00102506> { ___copy_skb_header + 0xea } RTS

Kernel Stack

Stack info:

SP: [0x01023f3c] <0x01023f3c> /* kernel dynamic memory (maybe user-space) */

Memory from 0x01023f30 to 01024000

01023f30:<00015c0a> 00000003  001cacd4 [01022000] 00000001  0000000c  00000100  00000009

01023f50: ffa01eaa  00000000  01018600  001d2460  04000000  00000000  00000000  00015cf6

01023f70: 001cacc0  01022000  01022000  0000ffff  00000000  00000001  00000000  01022000

01023f90: 00000001  00000000  00015d56  00000001  01022000  00000000  0002118e <0002119e>

01023fb0: 0101bf58  00015d00  00000000  00000000  00000000  00000000  00000000  00021144

01023fd0: 000014a8  00000000  00000000  01023fdc  01023fdc <000014ae> 00000000  00000000

01023ff0: 00000000  00000000  ffffffff  00000006

Return addresses in stack:

    address : <0x00015c0a> { ___do_softirq + 0x76 }

    address : <0x0002119e> { _kthread + 0x5a }

    address : <0x000014ae> { _kernel_thread_helper + 0x6 }

Modules linked in:

Kernel panic - not syncing: Kernel exception

Hardware Trace:

Stack info:

SP: [0x01023b14] <0x01023b14> /* kernel dynamic memory (maybe user-space) */

Memory from 0x01023b10 to 01024000

01023b10: 00000013 [00184f90] 0014ed82  01023bf0  00184f90  001c63ce  001c63ce  001c63ce

01023b30: 01023b44  00004324  01023bf0  00008008  01023bf0  0000003f  0000003f  01023d28

01023b50: 0015adf8  00030001  001db3e4  ffa00cd6 <000cb25e> 003276e0  008ffda0  01926190

01023b70: 000e6e16  01a456e0  000cb6b4  003276e0  008ffda0  000cb6b4  00384000  01ad3f50

01023b90: 0010ad10  0010ab6c  0000000c  02003024  0009b9ce  000cbdb4  003276e0  00000000

01023bb0: 00327400  003276e4 <000cbe0e> 003276e4  0000001e  000cbecc  000016d0  ffa00770

01023bd0: 001c3000  00008008  00000024  01023cdc  93b48960  008a2060  01023c08  00000480

01023bf0: 00000480  00008008  00000024  00000000  01023ccc  00000480  00131d26  00131cd2

01023c10: 00004f89  02003004  00102482  ffa0179c  00102482  ffa0179a  00000000  00000000

01023c30: 000006d3  00000000  001f76d3  00000000  00000000  00000000  00000000  0f000000

01023c50: 00000000  00000000  00000000  00000000  00000000  00000000  00000000  00000008

01023c70: 01a490aa  ffffffff  001d09a8  01a674e8  00000000  01a67558  01a662ff  008a2060

01023c90: 01a67540  001d39a0  01a67558  008a2060  00000001  00000020  01023cdc  93b48960

01023cb0: 00000000  0000ffc0  000003a1  00004f89  00004f89  008a2060  00000006  00000000

01023cd0: 00000001  00000000  01023cf0  00000002  00000000  001fb621  0001aca2  00000000

01023cf0: 00000000  01a5be80  00133958  008a2060  01a674b8  01a674a0  fffffd9f  00000002

01023d10: 008a20d0  93b48960  008a2060  001d5b1c  00000000  00000020  008a20d0  00133c48

01023d30: 01a674a0  008a2060  0000002e  00000004  00000000  00000000  00000001  ffffffff

01023d50: 008a20f8  008a2234  93b486ff  0012f7ba  008a2060  001d5b1c  00336760  000003a0

01023d70: 00000009  00000000  93b486ff  008a2060  00000000  93b486ff  0000002c  00000000

01023d90: 00000000  00000000  00000000  00000009  01023dd4  001305e4  008a2060  00336760

01023db0: 01a90038  0000002c  00000006  701a820a  01a90024  001d4d68  00102ad0  0000002c

01023dd0: 00000001  01023e10  001364dc  00336760  00336760  008a2060  0000894f  00000006

01023df0: 00336760  001d0ef8  001d0b1c  0000002c  4792986d  00000000  001368f2  0011514c

01023e10: 008a2060  00136aa8  00336760  01a90038  001d0b1c  0000894f  019200c0  01926000

01023e30: 01911b40  0000b204  701a820a  0000894f  00000006  01926000  01023ea4 <0011f67a>

01023e50: 00336760  001d0ef8  001d0b1c  00000006  00000008  001d0b1c  0000003f  0011f39e

01023e70: 01a90024  00336760  001d0b1c <0011f2a2> 01a90024  00336760  00000000  01927000

01023e90: 003bb800  001d39a0  00000000  00327400  0000003f  00327400 <00109d76> 001d0afc

01023eb0: 00336760  001d0b1c  00000000  0000003f  01a48014  01a48000  00327400  001d39a0

01023ed0: 00109e98  001deb64  001deb60  001d5b1c  00000000  00000000  001fb621  00000040

01023ef0: 000ce048  00336760  01a48064  001deb70 <0010a042> 001deb7c  001deb60  001d39a0

01023f10: 00000040  0000000c  0000012c  001fb623  001deb7c <0000aa10> 01018600  001cacc0

01023f30:<00015c0a> 00000003  001cacd4  01022000  00000001  0000000c  00000100  00000009

01023f50: ffa01eaa  00000000  01018600  001d2460  04000000  00000000  00000000  00015cf6

01023f70: 001cacc0  01022000  01022000  0000ffff  00000000  00000001  00000000  01022000

01023f90: 00000001  00000000  00015d56  00000001  01022000  00000000  0002118e <0002119e>

01023fb0: 0101bf58  00015d00  00000000  00000000  00000000  00000000  00000000  00021144

01023fd0: 000014a8  00000000  00000000  01023fdc  01023fdc <000014ae> 00000000  00000000

01023ff0: 00000000  00000000  ffffffff  00000006

Return addresses in stack:

    address : <0x000cb25e> { _ppp_push + 0x42 }

    address : <0x000cbe0e> { _ppp_xmit_process + 0x92 }

    address : <0x0011f67a> { _ip_local_deliver + 0x5e }

    address : <0x0011f2a2> { _ip_rcv_finish + 0x122 }

    address : <0x00109d76> { _netif_receive_skb + 0x1b6 }

    address : <0x0010a042> { _net_rx_action + 0x86 }

    address : <0x0000aa10> { _dequeue_task + 0x6c }

    address : <0x00015c0a> { ___do_softirq + 0x76 }

    address : <0x0002119e> { _kthread + 0x5a }

    address : <0x000014ae> { _kernel_thread_helper + 0x6 }

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2011-02-27 22:02:52     Re: USB issue? Streaming data over USB Modem

Sonic Zhang (CHINA)

Message: 98458   

Which kernel and uClinux-dist release do you use?

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2011-02-28 11:33:40     Re: USB issue? Streaming data over USB Modem

Mike Frysinger (UNITED STATES)

Message: 98476   

his crash message indicates the kernel version: 2010R1.  we can only assume the toolchain/uclinux-dist match ...

but i'm not sure that it matters.  we've seen unaligned issues in the past in the TCP networking stack.

Richard: please translate the crash offsets to files/line numbers.  only you can do this since you have the binary which matches the crash.  look at how objdump/addr2line are used here:

  docs.blackfin.uclinux.org/doku.php?id=uclinux-dist:analyzing_traces

QuoteReplyEditDelete

2011-03-01 08:04:24     Re: USB issue? Streaming data over USB Modem

Richard Aldrich (UNITED KINGDOM)

Message: 98505   

Hi Mike,

Thanks for response. I will have a look at the doc on analyzing traces.

Yes I am using matching toolchain and uclinux dist. (2010R1) It's a recent release which I upgraded to for the improved USB support.

Looking at the trace:

PC  : <0x00131d26> { _tcp_transmit_skb + 0x11e }

Is that where I should be looking?

That function is not in my user application, infact I can't find any reference to my application level in that trace. I presume it is because the send method i use would pass the control to the PPPD application which then buffers the data over the USB?

BTW, I haven't managed to repeat the issue when testing over Ethernet.

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2011-03-01 12:49:55     Re: USB issue? Streaming data over USB Modem

Mike Frysinger (UNITED STATES)

Message: 98508   

look at the trace for where it says FAULT.  that is where it falls down.

it could be that the USB device you're using doesnt make sure its packets are aligned before sending up to higher levels.  what device are you using exactly ?

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