[Bug 71415] Xorg SIGSEGV in sna_do_copy() for 2.99.905

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71415

--- Comment #10 from Michael Meeks <michael.meeks at collabora.com> ---
I attached gdb before starting LibreOffice; and got to:

(gdb) b sna_accel.c:14950
Breakpoint 2 at 0xb6beada9: file sna_accel.c, line 14950.
(gdb) c

Breakpoint 2, sna_validate_gc (gc=0x96c0158, changes=917504,
drawable=0x969ec50) at sna_accel.c:14950
14950        sna_gc(gc)->changes |= changes;
(gdb) condition 2 gc->pCompositeClip == 0
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0xb6bee678 in sna_do_copy (src=src at entry=0x96b5ec8, dst=dst at entry=0x9c72868,
gc=gc at entry=0xa016e70, sx=sx at entry=0, sy=sy at entry=0, 
    width=width at entry=300, height=height at entry=213, dx=dx at entry=5,
dy=dy at entry=-115, copy=0xb6c08fe0 <sna_copy_boxes>, 
    bitPlane=bitPlane at entry=0, closure=closure at entry=0x0) at sna_accel.c:6158
6158        if (gc->pCompositeClip->data)
(gdb) p *gc
$1 = {pScreen = 0x9346738, depth = 24 '\030', alu = 3 '\003', lineWidth = 0,
dashOffset = 0, numInDashList = 2, 
  dash = 0x8262bc8 <DefaultDash> "\004\004", lineStyle = 0, capStyle = 1,
joinStyle = 0, fillStyle = 0, fillRule = 0, arcMode = 1, 
  subWindowMode = 0, graphicsExposures = 0, clientClipType = 0, miTranslate =
1, tileIsPixel = 1, fExpose = 1, freeCompClip = 1, 
  scratch_inuse = 0, unused = 0, planemask = 4294967295, fgPixel = 0, bgPixel =
1, tile = {pixmap = 0x0, pixel = 0}, stipple = 0x9383990, 
  patOrg = {x = 0, y = 0}, font = 0x9384340, clipOrg = {x = 0, y = 0},
clientClip = 0x0, stateChanges = 0, serialNumber = 2802969, funcs = 0x0, 
  ops = 0xb6d1aa20 <sna_gc_ops>, devPrivates = 0xa016ec4, pRotatedPixmap = 0x0,
pCompositeClip = 0x0}
(gdb) bt
#0  0xb6bee678 in sna_do_copy (src=src at entry=0x96b5ec8,
dst=dst at entry=0x9c72868, gc=gc at entry=0xa016e70, sx=sx at entry=0, sy=sy at entry=0, 
    width=width at entry=300, height=height at entry=213, dx=dx at entry=5,
dy=dy at entry=-115, copy=0xb6c08fe0 <sna_copy_boxes>, 
    bitPlane=bitPlane at entry=0, closure=closure at entry=0x0) at sna_accel.c:6158
#1  0xb6bee9f6 in sna_copy_area (src=0x96b5ec8, dst=0x9c72868, gc=0xa016e70,
src_x=0, src_y=0, width=300, height=213, dst_x=5, dst_y=-115)
    at sna_accel.c:6247
#2  0x0807ac7f in ProcCopyArea (client=0xa01c390) at dispatch.c:1626
#3  0x0807eecd in Dispatch () at dispatch.c:432
#4  0x0806cf6a in main (argc=12, argv=0xbfb15404, envp=0xbfb15438) at
main.c:298

of course gdb lieth through it's teeth - but (presumably) if correct, that
points to the sna_validate_gc not getting called for this gc (somehow) (?)

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