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kernel crash due to USB issue

Srinivas Marakala1
Intellectual 560 points

Hi,

We have connected modem device to USB Port 1 on custom platform based on AM335x. When I disable/enable power to modem using EN pin, device is disconnected and connected back on the USB bus. I can see ttyUSB* ports are going away and coming back. But when I try to send a soft shut down event to Modem by AT^SMSO, some times I see kernel crashes. Last function is musb_g_tx.

USB should be in Host mode and musb_g_tx should not get called at all. When I debug further, I found that there are still interrupts in process while I issue command and before device gets disconnected on the bus. I can see EPROTO errors from musb_host_tx function which is OK I guess. Due to some reason MUSB_DEVCTL_HM bit is cleared in devctrl register and musb_g_tx is called in the last. And Kernel crash happens at that time. I am not sure why MUSB_DEVCTL_HM bit is zero.

ID signal is tied to ground. Also Software is forcing the port to be in Host mode by configuring IDDIG register. Can I get some help here?

Thanks,

Srinivas

  • 0
    TI__Guru**** 393215 points

    Can you please post what Linux version you are using?

  • 0 in reply to Biser Gatchev-XID
    Intellectual 560 points

    I am using Linux 3.12.10. TI release 7.00.00 for AM335x family.

    Thanks,

    Srinivas

  • 0 in reply to Srinivas Marakala1
    TI__Guru**** 175321 points

    Srinivas,

    Please post the dmesg log when the kernel crashes.

  • 0 in reply to Bin Liu
    Intellectual 560 points

    Hi Bin Liu,


    Here is the crash log:

    root@(none):~# echo AT^SMSO > /dev/ttyUSB2

    root@(none):~# [ 65.125620] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.131866] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.138071] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.144264] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.150457] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.156654] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.162846] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.169037] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.175233] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.181425] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.187615] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.193806] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.199997] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.206194] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.212384] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.218575] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.224771] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.230967] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.237158] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.243349] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.249541] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.255732] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.261923] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.268115] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.274306] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.280499] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.286691] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.292882] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.299076] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.305269] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.311461] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.317659] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.323850] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.330048] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.336239] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.342436] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.348629] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.354827] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.361019] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.367211] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.373404] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.379596] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.385793] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.391984] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.398175] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.404367] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.410563] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.416754] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.422951] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.429142] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.435334] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.441531] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.447723] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.453915] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.460113] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.466304] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.472496] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.478694] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.484891] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.491086] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.497280] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.503473] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.509671] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.515868] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.522060] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.528294] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.534518] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.540740] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.546960] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.553178] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.559399] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.565617] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.571829] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.578042] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.584255] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.590473] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.596692] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.602909] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.609120] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.615333] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.621550] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.627762] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.633979] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.640192] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.646404] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.652621] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.658832] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.665052] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.671264] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.677482] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.683700] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.689918] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.696131] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.702343] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.708558] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.714773] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.720991] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.727205] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.733417] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.739636] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.745853] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.752065] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.758278] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.764498] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.770717] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.776935] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.783154] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.789373] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.795592] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.801806] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.808020] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.814235] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.820449] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.826663] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.832880] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.839099] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.845312] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.851529] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.857741] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.863954] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.870168] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.876381] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.882594] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.888807] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.895026] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.901246] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.907461] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.913672] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.919886] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.926103] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.932315] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.938528] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.944742] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.950954] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.957166] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.963379] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.969594] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.975807] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.982020] option1 ttyUSB4: option_instat_callback: error -71

    [ 65.988237] option1 ttyUSB3: option_instat_callback: error -71

    [ 65.994452] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.000664] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.006876] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.013088] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.019300] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.025512] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.031728] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.037939] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.044151] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.050367] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.056583] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.062795] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.069006] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.075219] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.081431] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.087642] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.093857] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.100069] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.106282] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.112493] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.118711] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.124924] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.131135] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.137353] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.143571] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.149786] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.156005] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.162216] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.168434] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.174647] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.180859] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.187071] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.193288] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.199500] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.205717] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.211929] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.218141] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.224352] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.230569] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.236781] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.242993] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.249204] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.255417] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.261630] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.267843] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.274055] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.280272] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.286483] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.292695] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.298906] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.305120] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.311333] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.317546] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.323757] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.329969] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.336185] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.342402] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.348614] option1 ttyUSB3: option_instat_callback: error -71

    [ 66.354833] option1 ttyUSB4: option_instat_callback: error -71

    [ 66.361053] Unable to handle kernel paging request at virtual address fffffff8

    [ 66.368700] pgd = c0004000

    [ 66.371563] [fffffff8] *pgd=9fcf2821, *pte=00000000, *ppte=00000000

    [ 66.378219] Internal error: Oops: 17 [#1] PREEMPT ARM

    [ 66.383564] Modules linked in:

    [ 66.386805] CPU: 0 PID: 0 Comm: swapper Not tainted 3.12.10-ti2013.12.01 #21

    [ 66.394260] task: c083ad60 ti: c082e000 task.ti: c082e000

    [ 66.399990] PC is at musb_g_rx+0x88/0x128

    [ 66.404232] LR is at musb_interrupt+0xa4/0x974

    [ 66.408932] pc : [<c0439324>] lr : [<c0432db8>] psr: 200f0193

    [ 66.408932] sp : c082fc00 ip : 00000000 fp : c082fc24

    [ 66.421070] r10: e091eda6 r9 : 00000000 r8 : 00000000

    [ 66.426598] r7 : 00000000 r6 : dde36b58 r5 : dde36010 r4 : dde36b10

    [ 66.433500] r3 : e091eda0 r2 : 00003000 r1 : ffffffcc r0 : ffffffcc

    [ 66.440410] Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel

    [ 66.448238] Control: 10c5387d Table: 9dbb8019 DAC: 00000017

    [ 66.454311] Process swapper (pid: 0, stack limit = 0xc082e240)

    [ 66.460479] Stack: (0xc082fc00 to 0xc0830000)

    [ 66.465091] fc00: 00000001 0000000a dde36010 00000001 00000000 00000019 c082fc6c c082fc28

    [ 66.473750] fc20: c0432db8 c04392a8 c082fc84 c082fc38 c0435aa8 c05e0ccc 00000000 dde2f400

    [ 66.482399] fc40: 00000006 c0630848 dde36010 00000000 e0920800 a00f0193 00000001 ddd446c0

    [ 66.491048] fc60: c082fca4 c082fc70 c043ba60 c0432d20 00000101 00000000 c082fd44 dde304c0

    [ 66.499698] fc80: dde304c0 00000000 00000000 00000023 c08c1217 dd805340 c082fcdc c082fca8

    [ 66.508349] fca0: c0076a78 c043b880 dde2f4d4 600f0193 c082fcdc dd805340 dde304c0 c082fed8

    [ 66.517008] fcc0: 00000023 c082e000 00000101 00000000 c082fcf4 c082fce0 c0076c34 c0076a30

    [ 66.525659] fce0: dd805340 00000023 c082fd0c c082fcf8 c0079258 c0076be8 c00791c8 00000023

    [ 66.534309] fd00: c082fd24 c082fd10 c0076314 c00791d4 00000110 c088da04 c082fd44 c082fd28

    [ 66.542967] fd20: c00156c0 c00762f8 00000080 fa200000 c082fd68 c08c2070 c082fd64 c082fd48

    [ 66.551618] fd40: c00087cc c0015694 c03eb3b8 600f0113 ffffffff c082fd9c c082fdcc c082fd68

    [ 66.560276] fd60: c05e2540 c0008770 00000000 e091edb6 00000102 00000002 ddedaa40 600f0113

    [ 66.568926] fd80: ffffffb9 c082e000 c082e000 00000101 00000000 c082fdcc c082fc38 c082fdb0

    [ 66.577584] fda0: c0435aa8 c03eb3b8 600f0113 ffffffff ddedaa54 c082fdd0 dde2f4c8 dde2f4cc

    [ 66.586235] fdc0: c082fdf4 c082fdd0 c03eb4d8 c03eb358 c082fdd0 c082fdd0 00000000 c0882ffc

    [ 66.594892] fde0: 00000000 c08c3180 c082fe14 c082fdf8 c004be70 c03eb450 c0885218 00000001

    [ 66.603552] fe00: 00000000 c08c3184 c082fe64 c082fe18 c004b70c c004be18 00000201 2987d5c6

    [ 66.612210] fe20: c082fe4c 00000000 00200000 ffff4881 00000000 0000000a 00000023 600f0193

    [ 66.620867] fe40: 00000023 00000000 00000023 00000000 413fc082 c08c1215 c082fe7c c082fe68

    [ 66.629516] fe60: c004b894 c004b63c 00000000 c082e000 c082fe94 c082fe80 c004bb44 c004b84c

    [ 66.638166] fe80: 00000110 c088da04 c082feb4 c082fe98 c00156c4 c004baa4 00000080 fa200000

    [ 66.646816] fea0: c082fed8 c08c2070 c082fed4 c082feb8 c00087cc c0015694 c04963b8 200f0013

    [ 66.655465] fec0: ffffffff c082ff0c c082ff4c c082fed8 c05e2540 c0008770 c082ff20 3b9aca00

    [ 66.664113] fee0: 01db95d6 0000000f 27ac3a3d 0000000f c08afc68 00000001 00000000 413fc082

    [ 66.672764] ff00: c08c1215 c082ff4c 0000001a c082ff20 c007d52c c04963b8 200f0013 ffffffff

    [ 66.681420] ff20: 2987d013 0000000f 00000000 c083e0a8 c08afc68 00000001 c083e0a8 c08ef548

    [ 66.690069] ff40: c082ff74 c082ff50 c04964f0 c0496368 00000000 c082e000 00000000 c083610c

    [ 66.698719] ff60: c08c1215 00000001 c082ff84 c082ff78 c0015890 c0496458 c082ff9c c082ff88

    [ 66.707368] ff80: c00761a4 c001588c c082e000 c0816160 c082ffb4 c082ffa0 c05d8304 c0076158

    [ 66.716017] ffa0: 00000000 c08361d0 c082fff4 c082ffb8 c07d7a54 c05d8298 ffffffff ffffffff

    [ 66.724666] ffc0: c07d7544 00000000 00000000 c0816160 00000000 10c53c7d c08360a8 c081615c

    [ 66.733316] ffe0: c083be18 80004059 00000000 c082fff8 80008070 c07d77b4 00000000 00000000

    [ 66.741964] Backtrace:

    [ 66.744566] [<c043929c>] (musb_g_rx+0x0/0x128) from [<c0432db8>] (musb_interrupt+0xa4/0x974)

    [ 66.753507] [<c0432d14>] (musb_interrupt+0x0/0x974) from [<c043ba60>] (dsps_interrupt+0x1ec/0x30c)

    [ 66.762993] [<c043b874>] (dsps_interrupt+0x0/0x30c) from [<c0076a78>] (handle_irq_event_percpu+0x54/0x1b8)

    [ 66.773206] [<c0076a24>] (handle_irq_event_percpu+0x0/0x1b8) from [<c0076c34>] (handle_irq_event+0x58/0x80)

    [ 66.783516] [<c0076bdc>] (handle_irq_event+0x0/0x80) from [<c0079258>] (handle_level_irq+0x90/0x108)

    [ 66.793177] r5:00000023 r4:dd805340

    [ 66.796978] [<c00791c8>] (handle_level_irq+0x0/0x108) from [<c0076314>] (generic_handle_irq+0x28/0x38)

    [ 66.806812] r4:00000023 r3:c00791c8

    [ 66.810627] [<c00762ec>] (generic_handle_irq+0x0/0x38) from [<c00156c0>] (handle_IRQ+0x38/0x8c)

    [ 66.819821] r4:c088da04 r3:00000110

    [ 66.823621] [<c0015688>] (handle_IRQ+0x0/0x8c) from [<c00087cc>] (omap3_intc_handle_irq+0x68/0x7c)

    [ 66.833091] r6:c08c2070 r5:c082fd68 r4:fa200000 r3:00000080

    [ 66.839122] [<c0008764>] (omap3_intc_handle_irq+0x0/0x7c) from [<c05e2540>] (__irq_svc+0x40/0x74)

    [ 66.848502] Exception stack(0xc082fd68 to 0xc082fdb0)

    [ 66.853846] fd60: 00000000 e091edb6 00000102 00000002 ddedaa40 600f0113

    [ 66.862497] fd80: ffffffb9 c082e000 c082e000 00000101 00000000 c082fdcc c082fc38 c082fdb0

    [ 66.871144] fda0: c0435aa8 c03eb3b8 600f0113 ffffffff

    [ 66.876481] r7:c082fd9c r6:ffffffff r5:600f0113 r4:c03eb3b8

    [ 66.882505] [<c03eb34c>] (__usb_hcd_giveback_urb+0x0/0xf8) from [<c03eb4d8>] (usb_giveback_urb_bh+0x94/0xf0)

    [ 66.892902] r6:dde2f4cc r5:dde2f4c8 r4:c082fdd0 r3:ddedaa54

    [ 66.898934] [<c03eb444>] (usb_giveback_urb_bh+0x0/0xf0) from [<c004be70>] (tasklet_hi_action+0x64/0xb0)

    [ 66.908869] r7:c08c3180 r6:00000000 r5:c0882ffc r4:00000000

    [ 66.914889] [<c004be0c>] (tasklet_hi_action+0x0/0xb0) from [<c004b70c>] (__do_softirq+0xdc/0x1c4)

    [ 66.924275] r6:c08c3184 r5:00000000 r4:00000001 r3:c0885218

    [ 66.930292] [<c004b630>] (__do_softirq+0x0/0x1c4) from [<c004b894>] (do_softirq+0x54/0x60)

    [ 66.939048] [<c004b840>] (do_softirq+0x0/0x60) from [<c004bb44>] (irq_exit+0xac/0xf4)

    [ 66.947322] r4:c082e000 r3:00000000

    [ 66.951124] [<c004ba98>] (irq_exit+0x0/0xf4) from [<c00156c4>] (handle_IRQ+0x3c/0x8c)

    [ 66.959400] r4:c088da04 r3:00000110

    [ 66.963198] [<c0015688>] (handle_IRQ+0x0/0x8c) from [<c00087cc>] (omap3_intc_handle_irq+0x68/0x7c)

    [ 66.972677] r6:c08c2070 r5:c082fed8 r4:fa200000 r3:00000080

    [ 66.978696] [<c0008764>] (omap3_intc_handle_irq+0x0/0x7c) from [<c05e2540>] (__irq_svc+0x40/0x74)

    [ 66.988074] Exception stack(0xc082fed8 to 0xc082ff20)

    [ 66.993415] fec0: c082ff20 3b9aca00

    [ 67.002067] fee0: 01db95d6 0000000f 27ac3a3d 0000000f c08afc68 00000001 00000000 413fc082

    [ 67.010718] ff00: c08c1215 c082ff4c 0000001a c082ff20 c007d52c c04963b8 200f0013 ffffffff

    [ 67.019369] r7:c082ff0c r6:ffffffff r5:200f0013 r4:c04963b8

    [ 67.025397] [<c049635c>] (cpuidle_enter_state+0x0/0xf0) from [<c04964f0>] (cpuidle_idle_call+0xa4/0x148)

    [ 67.035418] r7:c08ef548 r6:c083e0a8 r5:00000001 r4:c08afc68

    [ 67.041439] [<c049644c>] (cpuidle_idle_call+0x0/0x148) from [<c0015890>] (arch_cpu_idle+0x10/0x4c)

    [ 67.050907] r8:00000001 r7:c08c1215 r6:c083610c r5:00000000 r4:c082e000

    r3:00000000

    [ 67.059236] [<c0015880>] (arch_cpu_idle+0x0/0x4c) from [<c00761a4>] (cpu_startup_entry+0x58/0x120)

    [ 67.068729] [<c007614c>] (cpu_startup_entry+0x0/0x120) from [<c05d8304>] (rest_init+0x78/0x90)

    [ 67.077831] r7:c0816160 r3:c082e000

    [ 67.081645] [<c05d828c>] (rest_init+0x0/0x90) from [<c07d7a54>] (start_kernel+0x2ac/0x308)

    [ 67.090380] r4:c08361d0 r3:00000000

    [ 67.094183] [<c07d77a8>] (start_kernel+0x0/0x308) from [<80008070>] (0x80008070)

    [ 67.102008] Code: e3c22004 e283a006 e6ff2072 e1ca20b0 (e51c8008)

    [ 67.108465] ---[ end trace 03863c71da54dfa9 ]---

    [ 67.113348] Kernel panic - not syncing: Fatal exception in interrupt

    [ 67.120066] Rebooting in 5 seconds..

    if I restrict not to enter in to musb_g_rx using extra check (musb->is_host) since controller should be in Host mode, I do not see the crash. I am not sure why MUSB_DEVCTL_HM bit is cleared.