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. > #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 ?? ()
