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The sisusb_drv experiences a SEGV shortly after xorg startup. It can initialize the screen of my dongle, but any real activity (such as a window manager starting up) brings it down. When run under gdb supervision, the problem appears to be that the SISUSBRefreshArea function is called with a num==0 (empty region). It is not prepared for that, and instead starts decrementing it and scribbling all over memory in a loop. #0 SISUSBRefreshArea (pScrn=0x8688c0, num=-4, pbox=0x829c68 <nerror>) at sisusb_shadow.c:102 (gdb) frame 1 #1 0x000000000051e1ac in DamageReportDamage (pDamage=pDamage@entry=0xb64820, pDamageRegion=pDamageRegion@entry=0xb64878) at damage.c:1913 1913 (*pDamage->damageReport) (pDamage, pDamageRegion, pDamage->closure); (gdb) frame 2 #2 0x000000000051e9da in damageRegionProcessPending (pDrawable=pDrawable@entry=0xde5d60) at damage.c:293 293 DamageReportDamage(pDamage, &pDamage->pendingDamage); (gdb) frame 1 (gdb) p pDamageRegion $14 = (RegionPtr) 0xb64878 (gdb) p *pDamageRegion $15 = {extents = {x1 = 0, y1 = 0, x2 = 0, y2 = 0}, data = 0x829c40 <RegionEmptyData>} (gdb) p *pDamageRegion->data $16 = {size = 0, numRects = 0} This wee little patch makes the driver work for me: --- sisusb_shadow.c~ 2012-06-06 07:05:19.000000000 -0400 +++ sisusb_shadow.c 2016-03-28 19:03:27.331991994 -0400 @@ -51,6 +51,9 @@ { SISUSBPtr pSiSUSB = SISUSBPTR(pScrn); + if (num == 0) + return; + #if 0 if(pSiSUSB->IgnoreRefresh) return; #endif
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