Status: Command failed                                                     
    Command: /usr/sbin/installboot -o console=pc,speed=9600 /dev/rwd0a /usr/mdec/bootxx_ffsv2            
     Hit enter to continue                                                      
--------------------------------------------------------------------------------
=================================================================               
==36==AddressSanitizer CHECK failed: /public/llvm/projects/compiler-rt/lib/asan/
asan_descriptions.cc:82 "((0 && "Address is not in memory and not in shadow?")) 
!= (0)" (0x0, 0x0)       
    #0 0x328d06  (/usr/sbin/installboot+0x128d06)                               
    #1 0x33c90f  (/usr/sbin/installboot+0x13c90f)                               
    #2 0x254795  (/usr/sbin/installboot+0x54795)                                
    #3 0x2558e6  (/usr/sbin/installboot+0x558e6)                                
    #4 0x2577f2  (/usr/sbin/installboot+0x577f2)                                
    #5 0x32665c  (/usr/sbin/installboot+0x12665c)                               
    #6 0x2661e4  (/usr/sbin/installboot+0x661e4)                                
    #7 0x23ad19  (/usr/sbin/installboot+0x3ad19)                                
    #8 0x231e67  (/usr/sbin/installboot+0x31e67)                                
    #9 0x230241  (/usr/sbin/installboot+0x30241)

---------------------

__asan::AsanCheckFailed(char const*, int, char const*, unsigned long long, unsigned long long)
??:0:0

__sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long)
??:0:0

__asan::GetShadowAddressInformation(unsigned long, __asan::ShadowAddressDescription*)
??:0:0

__asan::AddressDescription::AddressDescription(unsigned long, unsigned long, bool)
??:0:0

__asan::ErrorGeneric::ErrorGeneric(unsigned int, unsigned long, unsigned long, unsigned long, unsigned long, bool, unsigned long)
??:0:0

__asan::ReportGenericError(unsigned long, unsigned long, unsigned long, unsigned long, bool, unsigned long, unsigned int, bool)
??:0:0

__interceptor_memcmp
??:0:0

i386_setboot
??:0:0

main
??:0:0

___start
??:0:0

-------------------

=================================================================               
==25==AddressSanitizer CHECK failed: /public/llvm/projects/compiler-rt/lib/asan/
asan_descriptions.cc:82 "((0 && "Address is not in memory and not in shadow?")) 
!= (0)" (0x0, 0x0)       
    #0 0x52f476 in __asan::AsanCheckFailed(char const*, int, char const*, unsign
ed long long, unsigned long long) (/tmp/installboot-orig+0x52f476)              
    #1 0x54301f in __sanitizer::CheckFailed(char const*, int, char const*, unsig
ned long long, unsigned long long) (/tmp/installboot-orig+0x54301f)             
    #2 0x45af05 in __asan::GetShadowAddressInformation(unsigned long, __asan::Sh
adowAddressDescription*) (/tmp/installboot-orig+0x45af05)                       
    #3 0x45c056 in __asan::AddressDescription::AddressDescription(unsigned long,
 unsigned long, bool) (/tmp/installboot-orig+0x45c056)                          
    #4 0x45df62 in __asan::ErrorGeneric::ErrorGeneric(unsigned int, unsigned lon
g, unsigned long, unsigned long, unsigned long, bool, unsigned long) (/tmp/insta
llboot-orig+0x45df62)    
    #5 0x52cdcc in __asan::ReportGenericError(unsigned long, unsigned long, unsi
gned long, unsigned long, bool, unsigned long, unsigned int, bool) (/tmp/install
boot-orig+0x52cdcc)      
    #6 0x46c954 in __interceptor_memcmp (/tmp/installboot-orig+0x46c954)        
    #7 0x42eebd in is_zero (/tmp/installboot-orig+0x42eebd)                     
    #8 0x42dbba in i386_setboot (/tmp/installboot-orig+0x42dbba)                
    #9 0x421647 in main (/tmp/installboot-orig+0x421647)                        
    #10 0x41e745 in ___start (/tmp/installboot-orig+0x41e745)

------

"i386_setboot() /public/src.git/usr.sbin/installboot/arch/i386.c:425 is\ 
                                              _zero(0x7f7fffff8d8b, 4294967287)\n

                /* Find size of old BPB, and copy into new bootcode */
                printf("%s() %s:%d is_zero(%p, %u)\n", __func__, __FILE__, __LINE__, disk_buf.b + 3 + 8, disk_buf.b[1] - 1 - 8);
                if (!is_zero(disk_buf.b + 3 + 8, disk_buf.b[1] - 1 - 8)) {    /// <--- here
                        struct mbr_bpbFAT16 *bpb = (void *)(disk_buf.b + 3 + 8);
                        /* Check enough space before the FAT for the bootcode */
                        u = le16toh(bpb->bpbBytesPerSec)
                            * le16toh(bpb->bpbResSectors);
                        if (u != 0 && u < params->s1stat.st_size) {                                                                                          
                                warnx("Insufficient reserved space before FAT "
                                        "(%u bytes available)" USE_F, u);