Just enable previews in dolphin and I see with dmesg this:
[12740.462221] kio_thumbnail[4590]: segfault at f68 ip 00007f9f850dceef sp 00007fff065a5f60 error 4 in libgcc_s.so.1[7f9f850cc000+1a000]
[12740.828492] kio_thumbnail[4647]: segfault at f68 ip 00007f9f850dceef sp 00007fff065a5f60 error 4 in libgcc_s.so.1[7f9f850cc000+1a000]
[12740.914089] kio_thumbnail[4646]: segfault at f68 ip 00007f9f850dceef sp 00007fff065a5f60 error 4 in libgcc_s.so.1[7f9f850cc000+1a000]
[12740.943637] kio_thumbnail[4648]: segfault at f68 ip 00007f9f850dceef sp 00007fff065a5f60 error 4 in libgcc_s.so.1[7f9f850cc000+1a000]
[12741.254892] kio_thumbnail[4650]: segfault at f68 ip 00007f9f850dceef sp 00007fff065a5f60 error 4 in libgcc_s.so.1[7f9f850cc000+1a000]
[12741.316677] kio_thumbnail[4651]: segfault at f68 ip 00007f9f850dceef sp 00007fff065a5f60 error 4 in libgcc_s.so.1[7f9f850cc000+1a000]
[12741.379324] kio_thumbnail[4652]: segfault at f68 ip 00007f9f850dceef sp 00007fff065a5f60 error 4 in libgcc_s.so.1[7f9f850cc000+1a000]
[12742.094073] kio_thumbnail[4654]: segfault at f68 ip 00007f9f850dceef sp 00007fff065a5f60 error 4 in libgcc_s.so.1[7f9f850cc000+1a000]
[12742.197974] kio_thumbnail[4655]: segfault at f68 ip 00007f9f850dceef sp 00007fff065a5f60 error 4 in libgcc_s.so.1[7f9f850cc000+1a000]
[12742.382547] kio_thumbnail[4656]: segfault at f68 ip 00007f9f850dceef sp 00007fff065a5f60 error 4 in libgcc_s.so.1[7f9f850cc000+1a000]
....................................................
Same here:
[ 1275.202911] kio_thumbnail[ 9564]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9570]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9567]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9571]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9573]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9575]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9576]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9580]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9581]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9582]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9583]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9585]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9586]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000] 9591]: segfault at f68 ip 00007f15153fb4ef sp 00007fff20cf57b0 error 4 in libgcc_ s.so.1[ 7f15153eb000+ 16000]
[ 1294.870767] kio_thumbnail[
[ 1294.912927] kio_thumbnail[
[ 1295.745013] kio_thumbnail[
[ 1296.529923] kio_thumbnail[
[ 1296.656838] kio_thumbnail[
[ 1296.720527] kio_thumbnail[
[ 1302.956364] kio_thumbnail[
[ 1303.019802] kio_thumbnail[
[ 1303.079044] kio_thumbnail[
[ 1304.276404] kio_thumbnail[
[ 1304.820251] kio_thumbnail[
[ 1305.565976] kio_thumbnail[
[ 1312.209849] kio_thumbnail[