[mythtv] Backtrace: Goom segfaults
Ed Wildgoose
lists at wildgooses.com
Sun Feb 20 14:51:25 UTC 2005
Hi Carl,
Yep, finally I managed to recreate this exact same problem with debug
setting and no MMX, so it's not just the MMX stuff I think. Crashed in
exactly the same place as for you, but on mine the stack seemed to be
corrupted. I have trimmed the BT back to the essentials below in case
anyone else wants to peer in and try to see why it's dying. Looks
basically though like "x" is a bit messed up and causing the problem
because later it's used as a memory offset....
In my case it was running absolutely fine non-full screen, and then I
just said "how strange it didn't want to crash under the debugger",
switched it into full screen and less than a sec later it died.
..Hmm, looking at the code a bit longer. Going back to filters.c:434 it
looks like "py" goes negative, which means that "(py >> PERTEDEC)" is
unlikely to be what was expected...
I'm trying this quick hack to see if it helps:
>
> I've seen this one for quite a while too - it makes goom pretty
> useless. but I can get it to segfault with debug symbols. It seems to
> segfault quicker for me if goom is in full screen mode. I have MMX
> disabled across the board in MythMusic since it doesn't like to
> compile on AMD64s. If it matters, I see this when I am playing flac
> files from a R/O SMB mount. backtrace from 2/19 CVS build below
> message body.
> Thread 1 (process 22460):
> #0 0x0000002a9d30068e in getPixelRGB_ (buffer=0x227da00, x=4294967192,
> c=0x7fbfffc2b0) at goom/filters.c:391
> tmp8 = (
> unsigned char *) 0x40227d860 <Address 0x40227d860 out of bounds>
> #1 0x0000002a9d3008c1 in c_zoom (expix1=0x227da00, expix2=0x2273400,
> prevX=108, prevY=98, brutS=0x2288000, brutD=0x229cc80)
> at goom/filters.c:434
> col1 = {r = 169, v = 169, b = 43}
> col4 = {r = 174, v = 173, b = 41}
> c3 = 0
> pos = -104
> brutSmypos = 120
> col2 = {r = 171, v = 171, b = 38}
> c1 = 255
> c4 = 0
> px = 79
> col3 = {r = 172, v = 171, b = 45}
> c2 = 0
> py = -1
> coeffs = -535949824
> myPos = 4
> myPos2 = 5
> couleur = {r = 168, v = 168, b = 42}
> ax = 1712
> ay = 1552
> bufsize = 21168
> bufwidth = 108
> #2 0x0000002a9d301598 in zoomFilterFastRGB (pix1=0x227da00,
> pix2=0x2273400,
> zf=0x0, resx=108, resy=98, switchIncr=0, switchMult=0.966666639)
> at goom/filters.c:712
> x = 1174163456
> y = 2683611791
> reverse = 0 '\0'
> pertedec = 8 '\b'
> firstTime = 0 '\0'
> interlace_start = -2
> #3 0x0000002a9d303aa6 in goom_update (data=0x7fbfffc550, forceMode=0)
> at goom/goom_core.c:645
> lockvar = 29
> goomvar = 11
> totalgoom = 5
> agoom = 17
> abiggoom = 0
> loopvar = 7074
> speedvar = 17
> lineMode = 0
> nombreCDDC = 71
> return_val = (unsigned int *) 0x2273400
> pointWidth = 43
> pointHeight = 39
> incvar = 12147
> accelvar = 10
> i = 3
> largfactor = 0.445293337
> stop_lines = 0
> ifs_incr = 0
> decay_ifs = -829
> recay_ifs = 0
> switchMult = 0.966666639
> switchIncr = 0
> goomlimit = 19 '\023'
> zfd = {vitesse = 124, pertedec = 8 '\b', sqrtperte = 16 '\020',
> middleX = 54, middleY = 49, reverse = 0 '\0', mode = 7 '\a',
> hPlaneEffect = -4, vPlaneEffect = -4, waveEffect = 0, hypercosEffect
> = 0,
> noisify = 0 '\0'}
> pzfd = (ZoomFilterData *) 0x0
> #4 0x0000002a9d30b070 in Goom::process(VisualNode*) (this=0x21fe990,
> node=0x22e1010) at goom/mythgoom.cpp:102
> numSamps = 512
> data = {{-3200, -2833, -2470, -2053, -1526, -920, -331, 210, 699,
> 1155, 1637, 2134, 2608, 3008, 3390, 3753, 4153, 4559, 4838, 4987,
> 5111,
> 5235, 5276, 5280, 5295, 5239, 5116, 4974, 4875, 4805, 4804, 4863,
> 4952,
> 4993, 4912, 4678, 4276, 3814, 3373, 2958, 2495, 1909, 1193, 315,
> -637,
> -1691, -2858, -4063, -5256, -6371, -7332, -8231, -9102, -9869,
> -10578,
> -11226, -11705, -12053, -12281, -12422, -12471, -12517, -12635,
> -12780,
> -12982, -13108, -13065, -12867, -12422, -11745, -10927, -10057,
> -9258,
> -8509, -7833, -7144, -6402, -5614, -4893, -4353, -4008, -3723, -3447,
> -3229, -3040, -2832, -2604, -2337, -1978, -1551, -1084, -581, -60,
> 403,
> 817, 1223, 1642, 2099, 2466, 2720, 2837, 2823, 2751, 2709, 2803,
> 3054,
> 3501, 4050, 4537, 4921, 5229, 5493, 5759, 5959, 6021, 5892, 5514,
> 4931,
> 4164, 3304, 2346, 1270, 53, -1165, -2205, -2985, -3571, -4019, -4502,
> -5080, -5602, -6040, -6323, -6349, -6269, -6151, -6029, -5783, -5469,
> -5183, -4918, -4644, -4259, -3695, -2932, -1972, -831, 528, 2052,
> 3566,
> 4922, 6054, 6969, 7737, 8410, 9046, 9675, 10329, 10942, 11432, 11819,
> 12057, 12147, 12059, 11795, 11374, 10901, 10445, 10012, 9581,
> 9237, 8963,
> 8658, 8276, 7903, 7634, 7372, 6979, 6443, 5847, 5271, 4736, 4287,
> 3999,
> 3789, 3651, 3553, 3398, 3132, 2752, 2312, 1833, 1290, 713, 85, -544,
> -1133, -1667, -2076, -2231...}, {-3802, -3450, -3110, -2717,
> -2182, -1570,
> -965, -398, 138, 622, 1143, 1690, 2231, 2704, 3150, 3594, 4064, 4554,
> 4912, 5123, 5307, 5473, 5547, 5592, 5633, 5592, 5483, 5364, 5279,
> 5214,
> 5225, 5300, 5400, 5468, 5385, 5173, 4784, 4329, 3906, 3492, 3017,
> 2410,
> 1651, 718, -315, -1451, -2723, -4038, -5360, -6612, -7705, -8745,
> -9763,
> -10679, -11558, -12368, -13017, -13518, -13921, -14213, -14401,
> -14568,
> -14805, -15069, -15379, -15600, -15647, -15523, -15141, -14506,
> -13722,
> -12877, -12080, -11318, -10618, -9899, -9091, -8222, -7421, -6784,
> -6338,
> -5951, -5574, -5262, -4984, -4691, -4387, -4048, -3618, -3131, -2603,
> -2031, -1443, -902, -406, 81, 598, 1160, 1631, 2007, 2230, 2321,
> 2360,
> 2395, 2585, 2921, 3462, 4100, 4681, 5165, 5567, 5935, 6310, 6613,
> 6780,
> 6739, 6443, 5922, 5188, 4348, 3394, 2286, 1026, -269, -1409,
> -2301, -2987,
> -3544, -4134, -4823, -5436, -5966, -6334, -6443, -6424, -6378, -6298,
> -6099, -5822, -5568, -5314, -5051, -4680, -4119, -3334, -2346,
> -1168, 246,
> 1848, 3445, 4904, 6151, 7191, 8068, 8864, 9615, 10376, 11160, 11910,
> 12544, 13071, 13457, 13679, 13714, 13575, 13261, 12858, 12477, 12089,
> 11681, 11357, 11089, 10782, 10381, 10022, 9750, 9486, 9088, 8546,
> 7938,
> 7337, 6777, 6292, 5956, 5707, 5508, 5359, 5120, 4779, 4323, 3794,
> 3235,
> 2589, 1917, 1194, 460, -239, -875, -1389, -1644...}}
> i = 512
> #5 0x0000002a9d29a778 in MainVisual::timeout() (this=0x1d52710)
> at mainvisual.cpp:256
> process = true
> node = (VisualNode *) 0x22e1010
> stop = true
> #6 0x0000002a9d329946 in MainVisual::qt_invoke(int, QUObject*) (
> this=0x1d52710, _id=45, _o=0x7fbfffd040) at moc_mainvisual.cpp:94
> No locals.
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