Bug 5102

Is this still reproducible with the 7.1 release of xorg?

I've been bitten by the same bug on NetBSD with a similar video card. I can
confirm it happens with the latest release of X.org.

The culprit is mem_barrier(), which is set to void by default.  If you look at
common/compiler.h, you'll notice that Linux/amd64 uses a different value.  Using
that one on NetBSD makes the driver behave.

Right now I'm not sure how to make things proper for a commit in our xsrc tree,
but at least I have the culprit and a fix.

Created attachment 7226 [details] [review]
Diff for NetBSD's xsrc tree

Our xsrc tree is XFree86 4.5, but I tested it first on
xf86-video-nv-X11R7.1-1.1.1, with as much success.

Over a year without an update from the reporter.  Quentin it sounds like you have a different issue that isn't an nv driver bug.  Resolving.

Running FreeBSD 7.0 amd64 Xorg 7.3 I'm having the same problem:

0x00000008026917f6 in NVSync (pScrn=0x801a04000) at nv_xaa.c:303
303         while(READ_GET(pNv) != pNv->dmaPut);
(gdb) l
298         NVPtr pNv = NVPTR(pScrn);
299
300         if(pNv->DMAKickoffCallback)
301            (*pNv->DMAKickoffCallback)(pScrn);
302
303         while(READ_GET(pNv) != pNv->dmaPut);
304
305         while(pNv->PGRAPH[0x0700/4]);
306     }
307
(gdb) c
Continuing.
^C
Program received signal SIGINT, Interrupt.
0x00000008026917f6 in NVSync (pScrn=0x801a04000) at nv_xaa.c:303
303         while(READ_GET(pNv) != pNv->dmaPut);
(gdb) p pNv->dmaPut
$1 = 2269
(gdb) p pNv
$2 = 0x801a04000
(gdb) p *pNv
$3 = {SavedReg = {bpp = 0, width = 0, height = 0, interlace = 255,
    repaint0 = 96, repaint1 = 40, screen = 15, scale = 286261520,
    dither = 65536, extra = 0, fifo = 24, pixel = 131, horiz = 0,
    arbitration0 = 132, arbitration1 = 192, pll = 0, pllB = 0, vpll =
136452,
    vpll2 = 267525, vpllB = 2147486979, vpll2B = 2147485698, pllsel = 516,
    control = 0, general = 537919792, crtcOwner = 0, head = 4112,
    head2 = 196608, config = 1124089344, cursorConfig = 67178497,
    cursor0 = 251, cursor1 = 225, cursor2 = 7, timingH = 0, timingV = 0,
    displayV = 0, crtcSync = 1892, crtcVSync = 1229}, ModeReg = {bpp = 32,
    width = 1920, height = 1200, interlace = 255, repaint0 = 96, repaint1 =
0,
    screen = 15, scale = 286261520, dither = 65536, extra = 0, fifo = 24,
    pixel = 131, horiz = 0, arbitration0 = 4, arbitration1 = 192,
    pll = 145674, pllB = 2147484673, vpll = 145674, vpll2 = 267525,
    vpllB = 2147484673, vpll2B = 2147485698, pllsel = 268437248, control =
0,
    general = 537919792, crtcOwner = 0, head = 4112, head2 = 196608,
    config = 1124089344, cursorConfig = 67178752, cursor0 = 1019,
    cursor1 = 225, cursor2 = 7, timingH = 0, timingV = 0, displayV = 1200,
    crtcSync = 1892, crtcVSync = 1229}, CurrentState = 0x801a04094,
  Architecture = 64, CursorStart = 133677056, pEnt = 0x801a31500,
  PciInfo = 0x801a3d280, PciTag = 65536, Chipset = 282984810, ChipRev = 161,
  Primary = 1, IOAddress = 4160749568, FbAddress = 3221225472,
  FbBase = 0x803f8a000 "ÙÙÙ", FbStart = 0x803f8a000 "ÙÙÙ",
  FbMapSize = 134217728, FbUsableSize = 133644288, ScratchBufferSize =
16384,
  ScratchBufferStart = 133627904, NoAccel = 0, HWCursor = 1, FpScale = 1,
  ShadowFB = 0, ShadowPtr = 0x0, ShadowPitch = 0, MinVClockFreqKHz = 12000,
  MaxVClockFreqKHz = 400000, CrystalFreqKHz = 27000, RamAmountKBytes =
131072,
  REGS = 0x802d06000, PCRTC0 = 0x803306000, PCRTC = 0x803306000,
  PRAMDAC0 = 0x803386000, PFB = 0x802e06000, PFIFO = 0x802d08000,
  PGRAPH = 0x803106000, PEXTDEV = 0x802e07000, PTIMER = 0x802d0f000,
  PMC = 0x802d06000, PRAMIN = 0x803416000, FIFO = 0x803506000,
  CURSOR = 0x80bf06000, PCIO0 = 0x803307000 "", PCIO = 0x803307000 "",
  PVIO = 0x802dc6000 "", PDIO0 = 0x803387000 "", PDIO = 0x803387000 "",
---Type <return> to continue, or q <return> to quit---
  PRAMDAC = 0x803386000, AccelInfoRec = 0x801a68000,
  CursorInfoRec = 0x801a342c0, DGAModes = 0x801a65000, numDGAModes = 83,
  DGAactive = 0, DGAViewportStatus = 0, PointerMoved = 0,
  BlockHandler = 0x4de7e0 <miCreateScreenResources+2736>,
  CloseScreen = 0x801ff3290 <XvCloseScreen>,
  EnableDisableFBAccess = 0x4ad180 <xf86ForceHWCursor+160>, accessEnabled =
1,
  FBDev = 0, Rotate = 0, CurrentLayout = {bitsPerPixel = 32, depth = 24,
    displayWidth = 1920, weight = {red = 8, green = 8, blue = 8},
    mode = 0x801a45030}, curFg = 4278190080, curBg = 4294967295, curImage =
{
    0, 7, 0, 0, 6, 31, 0, 0, 30, 127, 0, 0, 124, 510, 0, 0, 508, 2046, 0, 0,
    2040, 16380, 0, 0, 8184, 16380, 0, 0, 496, 16376, 0, 0, 496, 1016, 0, 0,
    608, 2032, 0, 0, 1120, 3824, 0, 0, 2112, 7392, 0, 0, 4160, 14560, 0, 0,
    8192, 28896, 0, 0, 16384, 57344, 0, 0, 0, 49152, 0 <repeats 194 times>},
  I2C = 0x801a53420, pInt = 0x0, VideoTimerCallback = 0,
  DMAKickoffCallback = 0, overlayAdaptor = 0x0, blitAdaptor = 0x801a27000,
  videoKey = 66046, FlatPanel = 1, FPDither = 0, Television = 0,
  CRTCnumber = 0, Options = 0x801a25c00, alphaCursor = 1, DDCBase = 54 '6',
  twoHeads = 1, twoStagePLL = 1, fpScaler = 1, fpWidth = 1920,
  fpHeight = 1200, fpVTotal = 1235, fpSyncs = 268435472, usePanelTweak = 0,
  PanelTweak = 0, LVDS = 0, dmaPut = 2269, dmaCurrent = 2269, dmaFree =
5915,
  dmaMax = 8191, dmaBase = 0x80befe000, currentRop = 3, WaitVSyncPossible =
1,
  BlendingPossible = 1, RandRRotation = 0, VBEDualhead = 0, pVbe = 0x0,
  pVbeInfo = 0x0, vbeMode = 0, vbeCRTC1Offset = 0}
(gdb)




I can provide any information needed to analyze this bug.

If you add syslog(3) at the very beginning of NVDmaKickoff(NVPtr pNv) (nv_xaa.c line  106)  you will get rid of this bug (at least system will not hang). 

Black magic is not it?

imho syslog introduces random delay and this resolves an issue. Meanwhile neither fixed delay (i tried 10us and 100 us) nor printf help. 

My configuration:

FreeBSD7.0 release amd64 
X.Org X Server 1.4.0
nv-2.1.7
Chipset GeForce Go 7400
Fujitsu-Siemens Amilo Pa1838

update. 500 nsec fixed delay via nanosleep is also seems working

Common issue across all arch, combining bug reports to make fixing this easier to track

*** This bug has been marked as a duplicate of bug 3168 ***