(gdb) run -Syu
Starting program: /usr/bin/pacman -Syu
[Thread debugging using libthread_db enabled]
:: Synchronizing package databases...

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff5729a65 in __libc_res_nquery () from /lib/libresolv.so.2
(gdb) bt
#0  0x00007ffff5729a65 in __libc_res_nquery () from /lib/libresolv.so.2
#1  0x00007ffff5729f5e in ?? () from /lib/libresolv.so.2
#2  0x00007ffff572a545 in __libc_res_nsearch () from /lib/libresolv.so.2
#3  0x00007ffff593b947 in _nss_dns_gethostbyname4_r () from /lib/libnss_dns.so.2
#4  0x00007ffff7916ab1 in ?? () from /lib/libc.so.6
#5  0x00007ffff7918b30 in getaddrinfo () from /lib/libc.so.6
#6  0x00007ffff764c4e0 in fetch_connect () from /usr/lib/libfetch.so
#7  0x00007ffff7651327 in http_request () from /usr/lib/libfetch.so
#8  0x00007ffff7651c6c in fetchStatHTTP () from /usr/lib/libfetch.so
#9  0x00007ffff7bca4ec in ?? () from /usr/lib/libalpm.so.6
#10 0x00007ffff7bcaeed in ?? () from /usr/lib/libalpm.so.6
#11 0x00007ffff7bc49f8 in alpm_db_update () from /usr/lib/libalpm.so.6
#12 0x000000000040aaa7 in ?? ()
#13 0x000000000040514a in ?? ()
#14 0x00007ffff787817d in __libc_start_main () from /lib/libc.so.6
#15 0x0000000000405a05 in ?? ()
#16 0x00007fffffffeb58 in ?? ()
#17 0x00000000ffffffff in ?? ()
#18 0x0000000000000002 in ?? ()
#19 0x00007fffffffed8d in ?? ()
#20 0x00007fffffffed9d in ?? ()
#21 0x0000000000000000 in ?? ()