The sysctl(3) man page does not seem to contain anything about kern.exabort. While here, also use proper .Xr markup.
Index: mmap.2 =================================================================== RCS file: /cvs/src/lib/libc/sys/mmap.2,v retrieving revision 1.52 diff -u -p -r1.52 mmap.2 --- mmap.2 27 May 2016 19:45:04 -0000 1.52 +++ mmap.2 11 Mar 2017 00:58:46 -0000 @@ -281,7 +281,8 @@ In particular, .Dv PROT_WRITE | PROT_EXEC mappings are not permitted in most binaries (see .Dv kern.wxabort -in sysctl 3 +in +.Xr sysctl 8 for more information). .El .Sh SEE ALSO Index: mprotect.2 =================================================================== RCS file: /cvs/src/lib/libc/sys/mprotect.2,v retrieving revision 1.20 diff -u -p -r1.20 mprotect.2 --- mprotect.2 27 May 2016 19:45:04 -0000 1.20 +++ mprotect.2 11 Mar 2017 00:58:46 -0000 @@ -104,7 +104,8 @@ In particular, .Dv PROT_WRITE | PROT_EXEC mappings are not permitted in most binaries (see .Dv kern.wxabort -in sysctl 3 +in +.Xr sysctl 8 for more information). .It Bq Er EINVAL The
