In map_head_and_body_twice(), the second mmap call fails:
mmap2(NULL, 135168, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0xf64a2000
mmap2(0xf64b3000, 65536, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, 3, 0x1000) = -1 EINVAL (Invalid argument)
Due to cache issues, all shared mapping of a page must be equivalently
mapped. This requires page mappings to be at the same virtual address
modulo 4 MB. Due to a kernel limitation, all mappings to a file must
be equivalent.
The test can be fixed by rounding the buffer_size used in the mapped
ring buffer to 4 MB on hppa. This makes the two mmap mappings equivalent.
Bug-Debian: https://bugs.debian.org/1021853