Re: (ITS#8609) segfault in mods.c - modify_add_values

[okuznik@symas.com]

On Sun, Apr 16, 2017 at 06:20:06PM +0000, henson@acm.org wrote:
> On Mon, Apr 03, 2017 at 02:44:48PM +0100, Howard Chu wrote:
>=20
>> You should probably switch to a non-optimized build. The backtrace you
>> posted initially had most parameters optimized out, which also makes
>> things harder to trace.
>=20
> Well, as luck (8-/) would have it, it crashed both yesterday and today
> on the non-optimized build. Here are the full backtraces from both
> cores, I hope they provide some clue as to what's going on. Let me know
> if you want me to do any more post mortem debugging on the cores. Thank=
s
> much.
>=20
>=20
> Core was generated by `/usr/lib64/openldap/slapd -u ldap -g ldap -h lda=
ps:// ldap://'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> (gdb) bt full
> #6  0x00000000004c84b4 in syncrepl_message_to_op (si=3D0x16e4630, op=3D=
0x7fac037fd730, msg=3D0x7fabfc4a1560)
>     at /var/lib/portage/tmp/portage/net-nds/openldap-2.4.44-r1/work/ope=
nldap-2.4.44/servers/slapd/syncrepl.c:2394
> #7  0x00000000004c31cd in do_syncrep2 (op=3D0x7fac037fd730, si=3D0x16e4=
630)
>     at /var/lib/portage/tmp/portage/net-nds/openldap-2.4.44-r1/work/ope=
nldap-2.4.44/servers/slapd/syncrepl.c:1013
>         bdn =3D {bv_len =3D 44, bv_val =3D 0x7fabfc492bea "reqStart=3D2=
0170415103641.000016Z,cn=3Daccesslog"}
>=20
>=20
> Core was generated by `/usr/lib64/openldap/slapd -u ldap -g ldap -h lda=
ps:// ldap://'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> (gdb) bt full
> #6  0x00000000004c84b4 in syncrepl_message_to_op (si=3D0x1ea8970, op=3D=
0x7fa0b59f1730, msg=3D0x7fa0a012df60)
>     at /var/lib/portage/tmp/portage/net-nds/openldap-2.4.44-r1/work/ope=
nldap-2.4.44/servers/slapd/syncrepl.c:2394
> #7  0x00000000004c31cd in do_syncrep2 (op=3D0x7fa0b59f1730, si=3D0x1ea8=
970)
>     at /var/lib/portage/tmp/portage/net-nds/openldap-2.4.44-r1/work/ope=
nldap-2.4.44/servers/slapd/syncrepl.c:1013
>         bdn =3D {bv_len =3D 44, bv_val =3D 0x7fa0a0422609 "reqStart=3D2=
0170416103057.000005Z,cn=3Daccesslog"}

Hi Paul,
could you post the two accesslog entries (or at least an outline)
referenced in the backtrace?
- reqStart=3D20170415103641.000016Z,cn=3Daccesslog
- reqStart=3D20170416103057.000005Z,cn=3Daccesslog

I assume you are still running the same code in production, correct?

Thanks,
Ondrej

--=20
Ond=C5=99ej Kuzn=C3=ADk
Senior Software Engineer
Symas Corporation                       http://www.symas.com
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