==22308== Thread 5:
==22308== Conflicting load by thread 5 at 0x0b063aa0 size 4
==22308==    at 0xAE52EF0: reopen (res_send.c:941)
==22308==    by 0xAE54098: __libc_res_nsend (res_send.c:1031)
==22308==    by 0xAE51E04: __libc_res_nquery (res_query.c:226)
==22308==    by 0xAE527F8: __libc_res_nsearch (res_query.c:582)
==22308==    by 0xAC457E3: _nss_dns_gethostbyname3_r (dns-host.c:192)
==22308==    by 0xAC45A83: _nss_dns_gethostbyname2_r (dns-host.c:257)
==22308==    by 0x5172568: gethostbyname2_r@@GLIBC_2.2.5 (getXXbyYY_r.c:266)
==22308==    by 0x5132226: gaih_inet (getaddrinfo.c:586)
==22308==    by 0x5134E0C: getaddrinfo (getaddrinfo.c:2406)
==22308==    by 0x40096F: doit (k.c:39)
==22308==    by 0x4C30E7B: ??? (in /usr/lib/valgrind/vgpreload_drd-amd64-linux.so)
==22308==    by 0x4E4F181: start_thread (pthread_create.c:312)
==22308== Location 0xb063aa0 is 0 bytes inside global var "__have_o_nonblock"
==22308== declared at res_send.c:108
==22308== Other segment start (thread 4)
==22308==    at 0x4C34544: pthread_mutex_unlock (in /usr/lib/valgrind/vgpreload_drd-amd64-linux.so)
==22308==    by 0x40143E7: _dl_open (dl-open.c:721)
==22308==    by 0x519B0F1: do_dlopen (dl-libc.c:87)
==22308==    by 0x400FFF3: _dl_catch_error (dl-error.c:187)
==22308==    by 0x519B1B1: __libc_dlopen_mode (dl-libc.c:46)
==22308==    by 0x518244C: __nss_lookup_function (nsswitch.c:399)
==22308==    by 0x518276D: __nss_next2 (nsswitch.c:282)
==22308==    by 0x517253A: gethostbyname2_r@@GLIBC_2.2.5 (getXXbyYY_r.c:281)
==22308==    by 0x5132226: gaih_inet (getaddrinfo.c:586)
==22308==    by 0x5134E0C: getaddrinfo (getaddrinfo.c:2406)
==22308==    by 0x40096F: doit (k.c:39)
==22308==    by 0x4C30E7B: ??? (in /usr/lib/valgrind/vgpreload_drd-amd64-linux.so)
==22308== Other segment end (thread 4)
==22308==    at 0x515212D: ??? (syscall-template.S:81)
==22308==    by 0xAE543D0: __libc_res_nsend (res_send.c:1065)
==22308==    by 0xAE51E04: __libc_res_nquery (res_query.c:226)
==22308==    by 0xAE527F8: __libc_res_nsearch (res_query.c:582)
==22308==    by 0xAC457E3: _nss_dns_gethostbyname3_r (dns-host.c:192)
==22308==    by 0xAC45A83: _nss_dns_gethostbyname2_r (dns-host.c:257)
==22308==    by 0x5172568: gethostbyname2_r@@GLIBC_2.2.5 (getXXbyYY_r.c:266)
==22308==    by 0x5132226: gaih_inet (getaddrinfo.c:586)
==22308==    by 0x5134E0C: getaddrinfo (getaddrinfo.c:2406)
==22308==    by 0x40096F: doit (k.c:39)
==22308==    by 0x4C30E7B: ??? (in /usr/lib/valgrind/vgpreload_drd-amd64-linux.so)
==22308==    by 0x4E4F181: start_thread (pthread_create.c:312)