(gdb) bt
#0 0x0000003287f73474 in memset () from /lib64/libc.so.6
#1 0x0000003287f6c92a in calloc () from /lib64/libc.so.6
#2 0x0000000000407399 in read_cache () at read-cache.c:537
Ouch. Looks like malloc heap corruption.
git on hera is 1.1.6-1
Can you try running "valgrind" on it? That should show what corrupts the
heap.
Linus