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Currently, 'softsig-helper -buserror' causes a SIGBUS on most platforms, but can result in SIGSEGV on FreeBSD by default (at least on 11.3-RELEASE). Skip the test on FreeBSD, until we can provide a more reliable way to generate SIGBUS. Note that when the sysctl machdep.prot_fault_translation is set to 1, 'softsig-helper -buserror' generates a SIGBUS instead of SIGSEGV, suggesting that generating a SIGBUS here is the old 'compat' behavior. When machdep.prot_fault_translation is 0 (the default), the code path in the FreeBSD kernel that dictates whether to send a SIGBUS or SIGSEGV in this situation depends on some autodetection heuristics, and so may produce different results depending on FreeBSD releases or even compiler settings (due to detection of ABI based on some ELF notes in the relevant binary). For some details on this sysctl, see <https://www.freebsd.org/news/status/report-2019-07-2019-09.html#Signals-delivered-on-unhandled-Page-Faults> or the FreeBSD source code. In 11.3-RELEASE, the decision to issue a SIGBUS or SIGSEGV can be found around sys/amd64/amd64/trap.c:355. Change-Id: Ib75b43cc12302532ee87a3744fc364424f2a3ca6 Reviewed-on: https://gerrit.openafs.org/14145 Tested-by: BuildBot <buildbot@rampaginggeek.com> Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>