$ sudo gdb --args /usr/sbin/automount $OPTIONS -d -v -f

(gdb) run                                                
Starting program: /usr/sbin/automount -d -v -f                          
[...]
attempting to mount entry /net/wanda
lookup_mount: lookup(hosts): wanda -> (null)                                    
                         
get_exports: lookup(hosts): fetchng export list for wanda                       
                         
                                                                                
                         
Thread 6 "automount" received signal SIGSEGV, Segmentation fault.               
                         
[Switching to Thread 0x7ffff7fc8700 (LWP 13530)]                                
                         
0x0000000000000000 in ?? ()                                                     
                         
(gdb) bt                                                                        
                         
#0  0x0000000000000000 in ?? ()                                                 
                         
#1  0x00007ffff42fb8dc in ?? () from /lib/x86_64-linux-gnu/libtirpc.so.1        
                         
#2  0x00007ffff18b01ec in ?? () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so 
#3  0x00007ffff18b13fa in rpc_get_exports () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#4  0x00007ffff18ac516 in ?? () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#5  0x00007ffff18ad013 in lookup_mount () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#6  0x000055555556c70d in do_lookup_mount ()
#7  0x000055555556d441 in lookup_nss_mount ()
#8  0x00005555555634d5 in ?? ()
#9  0x00007ffff7bbd6db in start_thread (arg=0x7ffff7fc8700) at 
pthread_create.c:463
#10 0x00007ffff732188f in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb)
#0  0x0000000000000000 in ?? ()
#1  0x00007ffff42fb8dc in ?? () from /lib/x86_64-linux-gnu/libtirpc.so.1
#2  0x00007ffff18b01ec in ?? () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#3  0x00007ffff18b13fa in rpc_get_exports () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#4  0x00007ffff18ac516 in ?? () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#5  0x00007ffff18ad013 in lookup_mount () from 
/usr/lib/x86_64-linux-gnu/autofs/lookup_hosts.so
#6  0x000055555556c70d in do_lookup_mount ()
#7  0x000055555556d441 in lookup_nss_mount ()
#8  0x00005555555634d5 in ?? ()
#9  0x00007ffff7bbd6db in start_thread (arg=0x7ffff7fc8700) at 
pthread_create.c:463
#10 0x00007ffff732188f in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

 $ lsb_release -rd
Description:    Ubuntu Bionic Beaver (development branch)
Release:        18.04

Beta2

Package versions are the same as well.

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https://bugs.launchpad.net/bugs/1745817

Title:
  autofs 5.1.2-1ubuntu2 crashes on nfs mount

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