Program received signal SIGSEGV, Segmentation fault.
0x40397358 in XAAChangeGC (pGC=0x860fff0, mask=8388607) at xaaGC.c:269
269             pPixPriv->flags |= DIRTY;
(gdb) bt f
#0  0x40397358 in XAAChangeGC (pGC=0x860fff0, mask=8388607) at xaaGC.c:269
        pGCPriv = 0x8beae78
#1  0x0819a287 in miBSCheapChangeGC (pGC=0x860fff0, mask=1) at mibstore.c:828
No locals.
#2  0x08178a8b in cwCheapChangeGC (pGC=0x860fff0, mask=1) at cw.c:381
No locals.
#3  0x08178457 in cwDestroyGCPrivate (pGC=0x860fff0) at cw.c:170
        pPriv = 0x849bdb0
#4  0x0817880c in cwDestroyGC (pGC=0x860fff0) at cw.c:295
        pPriv = 0x2
#5  0x081741a3 in damageDestroyGC (pGC=0x860fff0) at damage.c:391
        pGCPriv = 0x861009c
#6  0x080ce29c in FreeGC (value=0x860fff0, gid=52429433) at gc.c:928
No locals.
#7  0x080d1d58 in FreeResource (id=52429433, skipDeleteFuncType=0)
    at resource.c:546
        rtype = 3
        cid = 25
        res = 0x8b08718
        prev = (ResourcePtr *) 0x86103c0
        head = (ResourcePtr *) 0x86103c0
        eltptr = (int *) 0x820f840
        gotOne = 0
#8  0x080bef79 in ProcFreeGC (client=0x86101c8) at dispatch.c:1698
        pGC = (GC *) 0x1
        stuff = (xResourceReq *) 0x8b93210
#9  0x080bcc12 in Dispatch () at dispatch.c:455
        clientReady = (int *) 0xbfffebf4
        result = 8
        client = 0x86101c8
        nready = 0
        start_tick = 7641000
#10 0x080cfd47 in main (argc=2, argv=0xbffff0d4, envp=0x1) at main.c:442
        pScreen = 0x8244a78
        i = 1
        j = 1
        k = 2
        error = 1186302995
        xauthfile = 0x1 <Address 0x1 out of bounds>
        alwaysCheckForInput = {0, 1}