Comment 35 for bug 173265

I've reproduced this running X under gdb through ssh. This is the backtrace:

(gdb) cont
Continuing.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7c846b0 (LWP 5643)]
0xb7d9df8b in strlen () from /lib/tls/i686/cmov/libc.so.6
(gdb) backtrace full
#0 0xb7d9df8b in strlen () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#1 0xb7d6d6c2 in vfprintf () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#2 0xb7d8e8f4 in vsnprintf () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#3 0x081bee37 in LogVWrite (verb=136350816, f=0x83f21f0 "(EE) intel(0): Failed to mprotect %s: %s\n", args=0xbfc1958c "\001") at ../../os/log.c:264
        len = <value optimized out>
        tmpBuffer = "(EE) intel(0): Failed to mprotect ne a\n\000ane a, not enabling on plane a\n\000 801 804 816 -hsync -vsync (49.0 kHz)\n\000/75dpi/:unscaled,\n\t/usr/share/fonts/X11/Type1,\n\t/usr/share/fonts/X11/100dpi,\n\t/usr/share/"...
#4 0x081bf3b9 in LogVMessageVerb (type=X_ERROR, verb=0, format=0x8425d08 "intel(0): Failed to mprotect %s: %s\n", args=0xbfc1958c "\001")
    at ../../os/log.c:368
        s = 0x81d8aab "(EE)"
#5 0x080d110a in xf86VDrvMsgVerb (scrnIndex=0, type=X_ERROR, verb=1, format=0xb7b76e06 "Failed to mprotect %s: %s\n", args=0xbfc1958c "\001")
    at ../../../../hw/xfree86/common/xf86Helper.c:1322
No locals.
#6 0x080d20ed in xf86DrvMsg (scrnIndex=0, type=X_ERROR, format=0xb7b76e06 "Failed to mprotect %s: %s\n") at ../../../../hw/xfree86/common/xf86Helper.c:1348
        ap = 0xbfc1958c "\001"
#7 0xb7b58347 in i830_unbind_memory (pScrn=0x821be58, mem=0x8442720) at ../../src/i830_memory.c:226
No locals.
#8 0xb7b59104 in i830_free_memory (pScrn=0x821be58, mem=0x8442720) at ../../src/i830_memory.c:269
No locals.
#9 0xb7b5dee7 in I830PutImage (pScrn=0x821be58, src_x=<value optimized out>, src_y=<value optimized out>, drw_x=236, drw_y=74, src_w=320, src_h=240,
    drw_w=808, drw_h=606, id=808596553,
    buf=0xa1cbf000 "\214\214\214\214\214\213\212\210\210\207\206\205\205\205\206\206\203\202\201\200~{xwwwwwwxxyz{||||||\177\177\177~~\177\177nacdca_]\\]_abba_[`YSMJJMRK6W\200\210\213\214\204S!\f\n\f\r\r\n\n\n\n\n\n\n\n\n", '\t' <repeats 53 times>, "\n\v\v\v\v\v\v\v\f\f\f\r\016\016\017\020\021\022\023\024\024\026\031\037&-13455558=CGIHFD@Ac\177^?UTQX"..., width=320, height=240, sync=0, clipBoxes=0xbfc198a4, data=0x822e2f4, pDraw=0x840f4b8) at ../../src/i830_video.c:2325
        pI830 = (I830Ptr) 0x821d848
        pScreen = (ScreenPtr) 0x8228df8
        pPixmap = <value optimized out>
        x1 = 0
        x2 = 20971520
        y1 = 0
        y2 = 15728640
        srcPitch = 320
        srcPitch2 = 160
        dstPitch = 192
        destId = 808596553
        top = <value optimized out>
        left = <value optimized out>
        npixels = <value optimized out>
        nlines = <value optimized out>
        size = 138240
        dstBox = {x1 = 236, y1 = 74, x2 = 1044, y2 = 680}
        pitchAlignMask = <value optimized out>
        alloc_size = 276480
        extraLinear = <value optimized out>
        crtc = <value optimized out>
#10 0x080da445 in xf86XVPutImage (client=0x8422108, pDraw=0x840f4b8, pPort=0x822d680, pGC=0x8414c80, src_x=<value optimized out>,
    src_y=<value optimized out>, src_w=<value optimized out>, src_h=<value optimized out>, drw_x=0, drw_y=0, drw_w=<value optimized out>,
    drw_h=<value optimized out>, format=0x8259230,
    data=0xa1cbf000 "\214\214\214\214\214\213\212\210\210\207\206\205\205\205\206\206\203\202\201\200~{xwwwwwwxxyz{||||||\177\177\177~~\177\177nacdca_]\\]_abba_[`YSMJJMRK6W\200\210\213\214\204S!\f\n\f\r\r\n\n\n\n\n\n\n\n\n", '\t' <repeats 53 times>, "\n\v\v\v\v\v\v\v\f\f\f\r\016\016\017\020\021\022\023\024\024\026\03---Type <return> to continue, or q <return> to quit---
1\037&-13455558=CGIHFD@Ac\177^?UTQX"..., sync=0, width=<value optimized out>, height=<value optimized out>) at ../../../../hw/xfree86/common/xf86xv.c:1777
        portPriv = <value optimized out>
        WinRegion = {extents = {x1 = 236, y1 = 74, x2 = 1044, y2 = 680}, data = 0x0}
        ClipRegion = {extents = {x1 = 236, y1 = 74, x2 = 1044, y2 = 680}, data = 0x0}
        ret = 0
#11 0xb7c107f8 in XvdiPutImage (client=0x8422108, pDraw=0x840f4b8, pPort=0x822d680, pGC=0x8414c80, src_x=<value optimized out>, src_y=<value optimized out>,
    src_w=<value optimized out>, src_h=<value optimized out>, drw_x=<value optimized out>, drw_y=<value optimized out>, drw_w=<value optimized out>,
    drw_h=<value optimized out>, image=0x8259230,
    data=0xa1cbf000 "\214\214\214\214\214\213\212\210\210\207\206\205\205\205\206\206\203\202\201\200~{xwwwwwwxxyz{||||||\177\177\177~~\177\177nacdca_]\\]_abba_[`YSMJJMRK6W\200\210\213\214\204S!\f\n\f\r\r\n\n\n\n\n\n\n\n\n", '\t' <repeats 53 times>, "\n\v\v\v\v\v\v\v\f\f\f\r\016\016\017\020\021\022\023\024\024\026\031\037&-13455558=CGIHFD@Ac\177^?UTQX"..., sync=0, width=<value optimized out>, height=<value optimized out>) at ../../Xext/xvmain.c:730
No locals.
#12 0xb7c13666 in ProcXvShmPutImage (client=0x8422108) at ../../Xext/xvdisp.c:1180
        ev = {type = 239 '�', bpad0 = 252 '�', sequenceNumber = 2068, drawable = 136341316, minorEvent = 39360, majorEvent = 193 '�', bpad1 = 191 '�',
  shmseg = 3217136136, offset = 136014349, pad0 = 138551560, pad1 = 136692632, pad2 = 1}
        pDraw = (DrawablePtr) 0x840f4b8
        pPort = (XvPortPtr) 0x822d680
        pImage = (XvImagePtr) 0x8259230
        pGC = (GCPtr) 0x8414c80
        status = 1
        size_needed = <value optimized out>
        i = <value optimized out>
        width = 320
        height = 240
#13 0x0814feee in XaceCatchExtProc (client=0x8422108) at ../../Xext/xace.c:299
        major = 140
        ext = <value optimized out>
#14 0x0808d93f in Dispatch () at ../../dix/dispatch.c:502
        result = <value optimized out>
        client = (ClientPtr) 0x8422108
        nready = 0
        start_tick = 180380
#15 0x080747ab in main (argc=10, argv=0xbfc19f64, envp=Cannot access memory at address 0x9
) at ../../dix/main.c:452
        pScreen = <value optimized out>
        i = 1
        error = 136164272
        xauthfile = <value optimized out>
        alwaysCheckForInput = {0, 1}
(gdb)