[Bug 232986] Use of ifunc in libc causes segfaults

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232986

--- Comment #1 from Shawn Webb <shawn.webb at hardenedbsd.org> ---
Log of the segfault in my dev VM:

WARNING: WITNESS option enabled, expect reduced performance.                    
Trying to mount root from zfs:rpool/ROOT/master-2018-11-05_01 []...             
pid 16798 (sh), uid 0: exited on signal 11                                      
2018-11-05T04:38:13.582502-05:00  init 1 - - /bin/sh on /etc/rc terminated
abnormally, going to single user mode                                           
Enter root password, or ^D to go multi-user                                     
Password:                                                                       
Enter full pathname of shell or RETURN for /bin/sh:                             
pid 38293 (sh), uid 0: exited on signal 11                                      
2018-11-05T04:38:50.300393-05:00  init 1 - - single user shell terminated,
restarting                                                                      
Enter root password, or ^D to go multi-user                                   
Password:                                                                       
Enter full pathname of shell or RETURN for /bin/sh: /rescue/sh                
pid 69875 (resizewin), uid 0: exited on signal 11                      
Segmentation fault                                                              
# bectl list                                                                    
pid 90914 (bectl), uid 0: exited on signal 11                                   
Segmentation fault                                                              
# /rescue/bectl list                                                            
BE                   Active Mountpoint Space Created                  
master-2018-11-05_01 NR     /          38.9G 2018-11-05 05:28                   
master-2018-11-01_01 -      -          3.51G 2018-11-01 12:11                   
master-2018-10-23_01 -      -          3.48G 2018-10-23 17:01                   
master-2018-10-22_01 -      -          3.49G 2018-10-22 06:38       
master-2018-09-26_02 -      -          19.8M 2018-09-26 16:07
master-2018-09-22_01 -      -          39.7G 2018-09-22 10:18                   
master-2018-10-31_01 -      -          3.59G 2018-10-31 14:25                   
master-2018-10-26_01 -      -          3.51G 2018-10-26 15:50      
# /rescue/bectl activate master-2018-11-01_01                  
successfully activated boot environment master-2018-11-01_01                    
# /rescue/shutdown -r now

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