Hey, On Tue, Jan 5, 2016 at 7:38 AM, Stuart Henderson <s...@spacehopper.org> wrote: > On 2016-01-04, Jeremie Le Hen <j...@freebsd.org> wrote: >> Hi, >> >> Yeah... when you read that subject you probably had this weird gaze ô_Ò >> like I did when I came to that conclusion. >> >> I've been experiencing segfaults in milter-greylist on one of my MX >> running OpenBSD for a while. I contacted Stuart (cc'ed) about 6 months >> ago about this, but gave up because I couldn't manage to compile >> everything with the debugging symbols. This time after much struggle to >> compile the ports chain with them, I finally managed to run >> milter-greylist in gdb(1) with the hope to witness the live crash and >> get a detailed stacktrace... >> >> Except that even after tinkling Postfix, it never happened. This simply >> worked fine. So after some more tinkering I came to the following >> conclusion: if I run strip(1) on /usr/local/lib/libbind/libbind.so.5.0 >> to remove the debugging symbols, then it will crash with the stacktrace >> below. > > libbind in the package isn't stripped either, it's just that it isn't built > with debug symbols. So I'm not sure what's going on there. > > Note for anyone else looking: this is all rather dirty because there are > conflicts between symbols in libc and libbind. It works well enough for net/mtr > and for the test program spf_example in libspf2's distribution, but I suspect > using it as a milter in the address space of an MTA that's using the libc > resolver is pushing our luck too far.
Alright, I finally got some time (vacations) to fix this. I got rid of the problem by removing the actually useless dependency over libbind. The binary has been running for one hour without crashing which was impossible previously. See the following patches for mail/libspf2 and mail/milter-greylist (I cc'ed Jakob, the maintainer): https://people.freebsd.org/~jlh/openbsd_mail_libspf2_no_libbind.diff https://people.freebsd.org/~jlh/openbsd_mail_milter-greylist_no_libbind.diff > > >> #0 0x00001cc53e386d40 in memcpy (dst0=0x1cc5c48b7000, src0=Variable "src0" is not available. >> ) at /usr/src/lib/libc/string/memcpy.c:94 >> #1 0x00001cc4f4d496d8 in __res_vinit () from /usr/local/lib/libbind/libbind.so.5.0 >> #2 0x00001cc4f4d48bda in __res_ninit () from /usr/local/lib/libbind/libbind.so.5.0 >> #3 0x00001cc50b181905 in SPF_dns_resolv_lookup (spf_dns_server=0x1cc5c48ab780, domain=0x1cc55122c1d0 "mydomain.org", rr_type=ns_t_spf, should_cache=1) at spf_dns_resolv.c:261 >> #4 0x00001cc50b180117 in SPF_dns_lookup (spf_dns_server=0x1cc5c48ab780, domain=0x1cc55122c1d0 "mydomain.org", rr_type=ns_t_spf, should_cache=1) at spf_dns.c:141 >> #5 0x00001cc50b180b16 in SPF_dns_cache_lookup (spf_dns_server=0x1cc5c48abc80, domain=0x1cc55122c1d0 "mydomain.org", rr_type=ns_t_spf, should_cache=1) at spf_dns_cache.c:408 >> #6 0x00001cc50b180117 in SPF_dns_lookup (spf_dns_server=0x1cc5c48abc80, domain=0x1cc55122c1d0 "mydomain.org", rr_type=ns_t_spf, should_cache=1) at spf_dns.c:141 >> #7 0x00001cc50b18e4e3 in SPF_server_get_record (spf_server=0x1cc5eb4154c0, spf_request=0x1cc5c48aeb00, spf_response=0x1cc5eb41b400, spf_recordp=0x1cc54f7c8700) at spf_server.c:351 >> #8 0x00001cc50b18c959 in SPF_request_query_mailfrom (spf_request=0x1cc5c48aeb00, spf_responsep=0x1cc54f7c87a0) at spf_request.c:291 >> #9 0x00001cc2ee1207ca in spf_check_internal (ad=0x1cc4f4c65948, as=AS_RCPT, ap=0x1cc54f7c8cd0, priv=0x1cc5c48af000) at spf.c:388 >> #10 0x00001cc2ee120c17 in spf_check (ad=0x1cc4f4c65948, as=AS_RCPT, ap=0x1cc54f7c8cd0, priv=0x1cc5c48af000) at spf.c:524 >> #11 0x00001cc2ee123a0d in acl_filter (stage=AS_RCPT, ctx=0x1cc5c48b2000, priv=0x1cc5c48af000) at acl.c:1902 >> #12 0x00001cc2ee1069ae in real_envrcpt (ctx=0x1cc5c48b2000, envrcpt=0x1cc5eb41c280) at milter-greylist.c:601 >> #13 0x00001cc2ee105de0 in mlfi_envrcpt (ctx=0x1cc5c48b2000, envrcpt=0x1cc5eb41c280) at milter-greylist.c:213 >> #14 0x00001cc52bfaa46e in st_rcpt () from /usr/local/lib/libmilter.so.4.0 >> #15 0x00001cc52bfab557 in mi_engine () from /usr/local/lib/libmilter.so.4.0 >> #16 0x00001cc52bfaca10 in mi_handle_session () from /usr/local/lib/libmilter.so.4.0 >> #17 0x00001cc52bfab7d9 in mi_thread_handle_wrapper () from /usr/local/lib/libmilter.so.4.0 >> #18 0x00001cc5a247d90e in _rthread_start (v=Variable "v" is not available. >> ) at /usr/src/lib/librthread/rthread.c:145 >> #19 0x00001cc53e33649b in __tfork_thread () at /usr/src/lib/libc/arch/amd64/sys/tfork_thread.S:75 >> #20 0x0000000000000000 in ?? () > -- Jeremie Le Hen j...@freebsd.org
