# PaStiX4CalculiX Segmentation fault cLightSpMV.cu:99

**URL:** <https://calculix.discourse.group/t/pastix4calculix-segmentation-fault-clightspmv-cu-99/350>\
**Category:** Uncategorized\
**Created:** [December 16, 2020, 7:47pm UTC](https://calculix.discourse.group/t/pastix4calculix-segmentation-fault-clightspmv-cu-99/350 "2020-12-16T19:47:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![max](https://avatars.discourse-cdn.com/v4/letter/m/e5b9ba/32.png) [@max](https://calculix.discourse.group/u/max)\
**Post date:** [December 16, 2020, 7:47pm UTC](https://calculix.discourse.group/t/pastix4calculix-segmentation-fault-clightspmv-cu-99/350/1 "2020-12-16T19:47:37Z")

</div>

This is a duplicate of [PaStiX4CalculiX issue 6](https://github.com/Dhondtguido/PaStiX4CalculiX/issues/6)  
I’m not sure if people who are active here also follow the issues on Github for PaStiX4CalculiX  
so I would like to post it here too.  
If such “double posts” are regarded as misbehaviour I apologize and will delete the post.

Hello,  
I get a Segmentation fault while running ccx\_2.17 with PaStiX4CalculiX Solver CUDA enabled and PASTIX\_GPU=1  
The input file is beam10p from the test tarball.

System:  
CENTOS 7.8  
gcc 9.3.0  
cuda 11.0.3

gdb shows:

> Thread 1 “ccx\_2.17\_i8” received signal SIGSEGV, Segmentation fault.  
> 0x000000000100167e in performLightLsMV (alpha=, dval=0xfffffffffffffff8, drowptr=0x0, dcolind=0xfffffffffffffff8, dx=0x1ef90, beta=0, dy=0x5c78)  
> at /tmp/work/Calculix\_ccx\_i8\_pastix/PaStiX4CalculiX/kernels/gpus/LightSpMV-1.0/src/cLightSpMV.cu:99  
> 99 spmv-\>\_rowOffsets[0] = drowptr;

> (gdb) l  
> 94 CHECK\_CUSPARSE( cusparseSpMV(handle, CUSPARSE\_OPERATION\_NON\_TRANSPOSE,  
> 95 &alpha, matA, vecX, &beta, vecY, CUDA\_R\_64F,  
> 96 CUSPARSE\_MV\_ALG\_DEFAULT, dBuffer) )  
> 97 \*/  
> 98   
> 99 spmv-\>\_rowOffsets[0] = drowptr;  
> 100 spmv-\>\_colIndexValues[0] = dcolind;  
> 101 spmv-\>\_numericalValues[0] = dval;  
> 102 spmv-\>\_vectorX[0] = dx;  
> 103 spmv-\>\_vectorY[0] = dy;

> (gdb) p drowptr  
> $1 = (int64\_t \*) 0x0

> (gdb) where  
> #0 0x000000000100167e in performLightLsMV (alpha=, dval=0xfffffffffffffff8, drowptr=0x0, dcolind=0xfffffffffffffff8, dx=0x1ef90, beta=0, dy=0x5c78)  
> at /tmp/work/Calculix\_ccx\_i8\_pastix/PaStiX4CalculiX/kernels/gpus/LightSpMV-1.0/src/cLightSpMV.cu:99  
> #_1_ 0x0000000000dad7b9 in gpu\_d\_spmv (n=258, alpha=1, beta=0, A=0x0, x=0x1ef98, y=0x5c78, rowptr=0x0, colind=0x0)  
> at /tmp/work/Calculix\_ccx\_i8\_pastix/PaStiX4CalculiX/build/kernels/gpu\_d\_spmv.c:35  
> #_2_ 0x0000000000a268a3 in d\_gmres\_gpu\_smp (pastix\_data=0xfd9d620, x=0x382b8, b=0x38ac8)  
> at /tmp/work/Calculix\_ccx\_i8\_pastix/PaStiX4CalculiX/build/refinement/d\_refine\_gmres\_gpu.c:270  
> #_3_ 0x0000000000a0b186 in pastix\_subtask\_refine (pastix\_data=0xfd9d620, n=258, nrhs=1, b=0x160d5e30, ldb=258, x=0xf8edf80, ldx=258)  
> at /tmp/work/Calculix\_ccx\_i8\_pastix/PaStiX4CalculiX/refinement/pastix\_task\_refine.c:182  
> #_4_ 0x0000000000a0b45d in pastix\_task\_refine (pastix\_data=0xfd9d620, n=258, nrhs=1, b=0x160d5e30, ldb=258, x=0xf8edf80, ldx=258)  
> at /tmp/work/Calculix\_ccx\_i8\_pastix/PaStiX4CalculiX/refinement/pastix\_task\_refine.c:303  
> #_5_ 0x00000000005f21fb in pastix\_solve\_generic (symmetryflag=, nrhs=, neq=, x=) at pastix.c:696  
> #_6_ pastix\_solve\_generic (x=0xf8edf80, neq=0x7fffffffaaa0, symmetryflag=, nrhs=0x7fffffff95a0) at pastix.c:644  
> #_7_ 0x00000000005f2d0d in pastix\_main\_generic (nrhs=0x7fffffff95a0, nzs3=0x7fffffffaad0, jq=0xf8ebab0, inputformat=0x7fffffff9460, symmetryflag=0x7fffffff9458,  
> nzs=0x7fffffffaac0, neq=0x7fffffffaaa0, irow=0xf8f8c70, icol=0xf8e9c40, b=0xf8edf80, sigma=0x7fffffff95b0, aub=0x0, adb=0x0, au=0xf914440, ad=0xf8ecf40) at pastix.c:837  
> #_8_ pastix\_main\_generic (ad=0xf8ecf40, au=0xf914440, adb=0x0, aub=0x0, sigma=0x7fffffff95b0, b=0xf8edf80, icol=0xf8e9c40, irow=0xf8f8c70, neq=0x7fffffffaaa0,  
> nzs=0x7fffffffaac0, symmetryflag=0x7fffffff9458, inputformat=0x7fffffff9460, jq=0xf8ebab0, nzs3=0x7fffffffaad0, nrhs=0x7fffffff95a0) at pastix.c:756  
> #_9_ 0x00000000005cec53 in linstatic (co=0xf8e6e50, nk=nk@entry=0x7fffffffa518, konp=konp@entry=0x7fffffffa358, ipkonp=ipkonp@entry=0x7fffffffa460,  
> lakonp=lakonp@entry=0x7fffffffa310, ne=ne@entry=0x7fffffffa520, nodeboun=0xf8e69a0, ndirboun=0xf8e6a10, xboun=0xf8e8bc0, nboun=0x7fffffffa528, ipompc=0x0,  
> nodempc=, coefmpc=, labmpc=0xf8e8d30 “”, nmpc=0x7fffffffa530, nodeforc=0xf8e8db0, ndirforc=0xf8e8e50, xforc=0xf8e8f40,  
> nforc=0x7fffffffa538, nelemload=0xf8e9780, sideload=0xf8e97a0 “\270缬\252\*”, xload=0xf8e97c0, nload=0x7fffffffa540, nactdof=0xf8f0040, icolp=0x7fffffffa3a0,  
> jq=0xf8ebab0, irowp=0x7fffffffa3c0, neq=0x7fffffffaaa0, nzl=0x7fffffffa570, nmethod=0x7fffffffa560, ikmpc=0x0, ilmpc=0x0, ikboun=0xf8e8c30, ilboun=0xf8e8ca0,  
> elcon=0xf8e9a30, nelcon=0xf8e9a50, rhcon=0xf8e9a70, nrhcon=0xf8e9a90, alcon=0xf8e9b00, nalcon=0xf8e9b40, alzero=0xf8e9b60, ielmatp=0x7fffffffa408,  
> ielorienp=0x7fffffffa410, norien=0x7fffffffa610, orab=0x0, ntmat\_=0x7fffffffa608, t0=0xf8ea9d0, t1=0xf8eaf00, t1old=0x0, ithermal=0x7fffffffaa00, prestr=0xf8eb960,  
> iprestr=0x7fffffffa618, vold=0xf8eebb0, iperturb=0x7fffffffa9f0, sti=0xf8f27d0, nzs=0x7fffffffaac0, kode=0x7fffffffa620, filab=0xf8f1750 ’ ’ \<repeats 200 times\>…,  
> eme=0xf8f5a20, iexpl=0x7fffffffa660, plicon=0x0, nplicon=0x0, plkcon=0x0, nplkcon=0x0, xstatep=0x7fffffffa950, npmat\_=0x7fffffffa680,  
> matname=0xf8f16f0 “EL”, ’ ’ \<repeats 78 times\>, isolver=0x7fffffffa628, mi=0x7fffffffaae0, ncmat\_=0x7fffffffa838, nstate\_=0x7fffffffa830, cs=0x0, mcs=0x7fffffffa708,  
> nkon=0x7fffffffa650, enerp=0x7fffffffa960, xbounold=0xf8eba40, xforcold=0xf8e8ef0, xloadold=0x0, amname=0xf8ea8b0 “”, amta=0xf8ea960, namta=0xf8ea990,  
> nam=0x7fffffffa578, iamforc=0xf8e8ea0, iamload=0x0, iamt1=0xf8eb430, iamboun=0xf8e6aa0, ttime=0x7fffffffa9e8, output=0x7fffffffa2db "asc ",  
> set=0xf8e9150 “NALLN”, ’ ’ \<repeats 76 times\>, “EALLE”, ’ ’ \<repeats 76 times\>, “FIXN”, ’ ’ \<repeats 34 times\>…, nset=0x7fffffffa550, istartset=0xf8e92a0,  
> iendset=0xf8e92d0, ialset=0xf8e9300, nprint=0x7fffffffa548, prlab=0xf8e9030 “U LRF LS L”,  
> prset=0xf8e9050 “NALLN”, ’ ’ \<repeats 76 times\>, “NALLN”, ’ ’ \<repeats 76 times\>, “EALLE”, ’ ’ \<repeats 33 times\>…, nener=0x7fffffffa6d8, trab=0x0, inotr=0xf8e9e60,  
> ntrans=0x7fffffffa688, fmpc=0x0, ipobody=0x0, ibody=0xf8e9800, xbody=0xf8e9820, nbody=0x7fffffffa598, xbodyold=0xf8e9840, timepar=0x7fffffffabd0, thicke=0x0,  
> jobnamec=0x7fffffffaf60 “beam10p”, tieset=0x0, ntie=0x7fffffffa6f8, istep=0x7fffffffa5e0, nmat=0x7fffffffa600, ielprop=0x0, prop=0x0,  
> typeboun=0xf8e6a80 ‘B’ \<repeats 12 times\>, mortar=0x7fffffffa640, mpcinfo=0x7fffffffab60, tietol=0x0, ics=0x0, icontact=0x7fffffffa760, orname=0x0,  
> itempuser=0x7fffffffaa60) at linstatic.c:985  
> #_10_ 0x00000000004179ae in main (argc=, argv=) at ccx\_2.17.c:1176

Is this a bug or a mistake from my side while setting up/compiling?

Any help is appreciated.  
Kind Regards, and thanks in advance

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**Author:** ![max](https://avatars.discourse-cdn.com/v4/letter/m/e5b9ba/32.png) [@max](https://calculix.discourse.group/u/max)\
**Post date:** [January 7, 2021, 2:44pm UTC](https://calculix.discourse.group/t/pastix4calculix-segmentation-fault-clightspmv-cu-99/350/2 "2021-01-07T14:44:31Z")

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The problem is solved by setting PASTIX\_REFINE\_GPU=1 as additional environment variable.

> <https://github.com/Dhondtguido/PaStiX4CalculiX/issues/6#issuecomment-756042486>
>
> Hello,
> I get a Segmentation fault while running ccx\_2.17 with PaStiX4CalculiX Solver CUDA enabled and PASTIX\_GPU=1
> The input file is beam10p from the...