Description of problem:
kdc segfault was observed when the certauth plugin points to ipadb.so.
It starts on RHEL-7.3 when ipa-server-4.5.0-20.el7 (from RHEL-7.4) is
installed. Backtrace goes down from krb5 through ipa to openldap. Not sure is
the issue is in openldap triggered by the ipa krb5 plugin or in the ipa plugin
itself. As it is triggered by the ipa-server plugin filing it for ipa now, but
feel free to move it to the right component.

Also tested on the latest builds, the issue is still there.

#0  __strlen_sse2_pminub () at
../sysdeps/x86_64/multiarch/strlen-sse2-pminub.S:38
#1  0x00007fefc29d2954 in ber_strdup_x (s=s@entry=0x1 <Address 0x1 out of
bounds>, ctx=ctx@entry=0x0)
    at memory.c:637
#2  0x00007fefc2c12658 in ldap_str2charray (str_in=str_in@entry=0x1 <Address
0x1 out of bounds>,
    brkstr=brkstr@entry=0x7fefc2c2282e ", ") at charray.c:188
#3  0x00007fefc2c07b46 in ldap_url_parselist_int
(ludlist=ludlist@entry=0x7ffe708282d0,
    url=url@entry=0x1 <Address 0x1 out of bounds>, sep=0x7fefc2c2282e ", ",
sep@entry=0x0, flags=flags@entry=3)
    at url.c:1293
#4  0x00007fefc2c07c75 in ldap_url_parselist_ext
(ludlist=ludlist@entry=0x7ffe708282d0,
    url=url@entry=0x1 <Address 0x1 out of bounds>, sep=sep@entry=0x0,
flags=flags@entry=3) at url.c:1324
#5  0x00007fefc2c0a89b in ldap_set_option (ld=0x55f6dc442b30,
option=option@entry=20486, invalue=invalue@entry=0x1)
    at options.c:584
#6  0x00007fefc2bee2fb in ldap_initialize (ldp=ldp@entry=0x55f6dc4524a0,
url=0x1 <Address 0x1 out of bounds>)
    at open.c:245
#7  0x00007fefc3e1c169 in ipadb_get_connection
(ipactx=ipactx@entry=0x55f6dc452470) at ipa_kdb.c:399
#8  0x00007fefc3e1ca20 in ipadb_check_connection (ipactx=0x55f6dc452470,
ipactx@entry=0x2) at ipa_kdb_common.c:164
#9  ipadb_simple_search (ipactx=ipactx@entry=0x55f6dc452470,
    basedn=0x55f6dc447900 "cn=certmap,/var/kerberos/krb5kdc/principal",
scope=scope@entry=2,
    filter=filter@entry=0x7fefc3e2b8b8
"(&(objectClass=ipaCertMapRule)(ipaEnabledFlag=TRUE))",
    attrs=attrs@entry=0x7ffe708284c0, res=res@entry=0x7ffe708284a0) at
ipa_kdb_common.c:176
#10 0x00007fefc3e27081 in ipa_get_init_data (moddata_out=0x55f6dc439f70,
kcontext=0x55f6dc452ef0)
    at ipa_kdb_certauth.c:160
#11 ipa_certauth_authorize (context=0x55f6dc452ef0, moddata=0x55f6dc439f70,
    cert=0x55f6dc4482c0 "0\202\003r0\202\002?\003\002\001\002\002\t",
cert_len=886, princ=<optimized out>,
    opts=<optimized out>, db_entry=0x55f6dc43c880, authinds_out=0x7ffe70828638)
at ipa_kdb_certauth.c:280
#12 0x00007fefc4abfd0d in authorize_cert (client=<optimized out>,
rock=0x55f6dc4550c0,
    cb=0x55f6da9d9020 <callbacks>, reqctx=0x55f6dc43cab0,
plgctx=0x55f6dc425d30, certauth_modules=<optimized out>,
    context=0x55f6dc452ef0) at pkinit_srv.c:367
#13 pkinit_server_verify_padata (context=0x55f6dc452ef0, req_pkt=<optimized
out>, request=<optimized out>,
    enc_tkt_reply=0x55f6dc454f88, data=0x55f6dc4543b0, cb=0x55f6da9d9020
<callbacks>, rock=0x55f6dc4550c0,
    moddata=0x55f6dc40b2c0, respond=0x55f6da7c71a0 <finish_verify_padata>,
arg=0x55f6dc43eef0) at pkinit_srv.c:507
#14 0x000055f6da7c7123 in next_padata (state=<optimized out>) at
kdc_preauth.c:1209
#15 0x000055f6da7be7d5 in process_as_req (request=<optimized out>,
req_pkt=req_pkt@entry=0x55f6dc43b1f8,
    from=from@entry=0x55f6dc453628, kdc_active_realm=0x55f6dc405300,
vctx=vctx@entry=0x55f6dc415a20,
    respond=respond@entry=0x55f6da7bca00 <finish_dispatch_cache>,
arg=arg@entry=0x55f6dc43a200) at do_as_req.c:819
#16 0x000055f6da7bcd22 in dispatch (cb=0x55f6da9d92c0 <shandle>,
local_saddr=<optimized out>, from=0x55f6dc453628,
    pkt=pkt@entry=0x55f6dc43b1f8, is_tcp=is_tcp@entry=1,
vctx=vctx@entry=0x55f6dc415a20,
    respond=respond@entry=0x55f6da7d00f0 <process_tcp_response>,
arg=arg@entry=0x55f6dc43b170) at dispatch.c:190
#17 0x000055f6da7d03d0 in process_tcp_connection_read (ctx=0x55f6dc415a20,
ev=0x55f6dc4536d0) at net-server.c:1409
#18 0x00007fefcc0a6cd8 in verto_fire (ev=0x55f6dc4536d0) at verto.c:947
#19 0x00007fefc4ce6a14 in event_process_active_single_queue
(activeq=0x55f6dc425770, base=0x55f6dc425340)
    at event.c:1350
#20 event_process_active (base=<optimized out>) at event.c:1420
#21 event_base_loop (base=0x55f6dc425340, flags=0) at event.c:1621
#22 0x000055f6da7bb9ff in main (argc=2, argv=0x7ffe70828c88) at main.c:1065


Version-Release number of selected component (if applicable):
openldap-2.4.44-5.el7
krb5-server-1.15.1-8.el7
ipa-server-4.5.0-20.el7

How reproducible:
always

Steps to Reproduce:
1. Install ipa-server package and make sure certauth plugin points to ipadb.so
# cat /etc/krb5.conf.d/ipa-certauth
[plugins]
 certauth = {
  module = ipakdb:kdb/ipadb.so
  enable_only = ipakdb
 }


2. Do not setup ipa server, just create certs and set up KDC with pkinit
# cat /etc/krb5.conf
includedir /etc/krb5.conf.d/

[logging]
 default = FILE:/var/log/krb5libs.log
 kdc = FILE:/var/log/krb5kdc.log
 admin_server = FILE:/var/log/kadmind.log

[libdefaults]
 dns_lookup_realm = false
 ticket_lifetime = 24h
 renew_lifetime = 7d
 forwardable = true
 rdns = false
 default_realm = EXAMPLE.COM
 default_ccache_name = KEYRING:persistent:%{uid}

 EXAMPLE.COM = {
  pkinit_anchors = FILE:/etc/krb5/cacert.pem
  pkinit_identities = FILE:/etc/krb5/client.pem,/etc/krb5/clientkey.pem
  kdc = kerberos.example.com
  admin_server = kerberos.example.com
 }

[domain_realm]
 .example.com = EXAMPLE.COM
 example.com = EXAMPLE.COM

# cat /var/kerberos/krb5kdc/kdc.conf
[kdcdefaults]
 pkinit_anchors = FILE:/var/kerberos/krb5kdc/cacert.pem
 pkinit_identity =
FILE:/var/kerberos/krb5kdc/kdc.pem,/var/kerberos/krb5kdc/kdckey.pem
 kdc_ports = 88
 kdc_tcp_ports = 88

[realms]
 EXAMPLE.COM = {
  acl_file = /var/kerberos/krb5kdc/kadm5.acl
  dict_file = /usr/share/dict/words
  admin_keytab = /var/kerberos/krb5kdc/kadm5.keytab
  supported_enctypes = aes256-cts:normal aes128-cts:normal
des3-hmac-sha1:normal arcfour-hmac:normal camellia256-cts:normal
camellia128-cts:normal des-hmac-sha1:normal des-cbc-md5:normal
des-cbc-crc:normal
 }


3. Configure a principal with preath required and do kinit

Actual results:
kdc segfault

Expected results:
no segfault

Additional info:

#0  __strlen_sse2_pminub () at
../sysdeps/x86_64/multiarch/strlen-sse2-pminub.S:38
#1  0x00007fefc29d2954 in ber_strdup_x (s=s@entry=0x1 <Address 0x1 out of
bounds>, ctx=ctx@entry=0x0)
    at memory.c:637
#2  0x00007fefc2c12658 in ldap_str2charray (str_in=str_in@entry=0x1 <Address
0x1 out of bounds>,
    brkstr=brkstr@entry=0x7fefc2c2282e ", ") at charray.c:188
#3  0x00007fefc2c07b46 in ldap_url_parselist_int
(ludlist=ludlist@entry=0x7ffe708282d0,
    url=url@entry=0x1 <Address 0x1 out of bounds>, sep=0x7fefc2c2282e ", ",
sep@entry=0x0, flags=flags@entry=3)
    at url.c:1293
#4  0x00007fefc2c07c75 in ldap_url_parselist_ext
(ludlist=ludlist@entry=0x7ffe708282d0,
    url=url@entry=0x1 <Address 0x1 out of bounds>, sep=sep@entry=0x0,
flags=flags@entry=3) at url.c:1324
#5  0x00007fefc2c0a89b in ldap_set_option (ld=0x55f6dc442b30,
option=option@entry=20486, invalue=invalue@entry=0x1)
    at options.c:584
#6  0x00007fefc2bee2fb in ldap_initialize (ldp=ldp@entry=0x55f6dc4524a0,
url=0x1 <Address 0x1 out of bounds>)
    at open.c:245
#7  0x00007fefc3e1c169 in ipadb_get_connection
(ipactx=ipactx@entry=0x55f6dc452470) at ipa_kdb.c:399
#8  0x00007fefc3e1ca20 in ipadb_check_connection (ipactx=0x55f6dc452470,
ipactx@entry=0x2) at ipa_kdb_common.c:164
#9  ipadb_simple_search (ipactx=ipactx@entry=0x55f6dc452470,
    basedn=0x55f6dc447900 "cn=certmap,/var/kerberos/krb5kdc/principal",
scope=scope@entry=2,
    filter=filter@entry=0x7fefc3e2b8b8
"(&(objectClass=ipaCertMapRule)(ipaEnabledFlag=TRUE))",
    attrs=attrs@entry=0x7ffe708284c0, res=res@entry=0x7ffe708284a0) at
ipa_kdb_common.c:176
#10 0x00007fefc3e27081 in ipa_get_init_data (moddata_out=0x55f6dc439f70,
kcontext=0x55f6dc452ef0)
    at ipa_kdb_certauth.c:160
#11 ipa_certauth_authorize (context=0x55f6dc452ef0, moddata=0x55f6dc439f70,
    cert=0x55f6dc4482c0 "0\202\003r0\202\002?\003\002\001\002\002\t",
cert_len=886, princ=<optimized out>,
    opts=<optimized out>, db_entry=0x55f6dc43c880, authinds_out=0x7ffe70828638)
at ipa_kdb_certauth.c:280
#12 0x00007fefc4abfd0d in authorize_cert (client=<optimized out>,
rock=0x55f6dc4550c0,
    cb=0x55f6da9d9020 <callbacks>, reqctx=0x55f6dc43cab0,
plgctx=0x55f6dc425d30, certauth_modules=<optimized out>,
    context=0x55f6dc452ef0) at pkinit_srv.c:367
#13 pkinit_server_verify_padata (context=0x55f6dc452ef0, req_pkt=<optimized
out>, request=<optimized out>,
    enc_tkt_reply=0x55f6dc454f88, data=0x55f6dc4543b0, cb=0x55f6da9d9020
<callbacks>, rock=0x55f6dc4550c0,
    moddata=0x55f6dc40b2c0, respond=0x55f6da7c71a0 <finish_verify_padata>,
arg=0x55f6dc43eef0) at pkinit_srv.c:507
#14 0x000055f6da7c7123 in next_padata (state=<optimized out>) at
kdc_preauth.c:1209
#15 0x000055f6da7be7d5 in process_as_req (request=<optimized out>,
req_pkt=req_pkt@entry=0x55f6dc43b1f8,
    from=from@entry=0x55f6dc453628, kdc_active_realm=0x55f6dc405300,
vctx=vctx@entry=0x55f6dc415a20,
    respond=respond@entry=0x55f6da7bca00 <finish_dispatch_cache>,
arg=arg@entry=0x55f6dc43a200) at do_as_req.c:819
#16 0x000055f6da7bcd22 in dispatch (cb=0x55f6da9d92c0 <shandle>,
local_saddr=<optimized out>, from=0x55f6dc453628,
    pkt=pkt@entry=0x55f6dc43b1f8, is_tcp=is_tcp@entry=1,
vctx=vctx@entry=0x55f6dc415a20,
    respond=respond@entry=0x55f6da7d00f0 <process_tcp_response>,
arg=arg@entry=0x55f6dc43b170) at dispatch.c:190
#17 0x000055f6da7d03d0 in process_tcp_connection_read (ctx=0x55f6dc415a20,
ev=0x55f6dc4536d0) at net-server.c:1409
#18 0x00007fefcc0a6cd8 in verto_fire (ev=0x55f6dc4536d0) at verto.c:947
#19 0x00007fefc4ce6a14 in event_process_active_single_queue
(activeq=0x55f6dc425770, base=0x55f6dc425340)
    at event.c:1350
#20 event_process_active (base=<optimized out>) at event.c:1420
#21 event_base_loop (base=0x55f6dc425340, flags=0) at event.c:1621
#22 0x000055f6da7bb9ff in main (argc=2, argv=0x7ffe70828c88) at main.c:1065
(gdb) bt f
#0  __strlen_sse2_pminub () at
../sysdeps/x86_64/multiarch/strlen-sse2-pminub.S:38
No locals.
#1  0x00007fefc29d2954 in ber_strdup_x (s=s@entry=0x1 <Address 0x1 out of
bounds>, ctx=ctx@entry=0x0)
    at memory.c:637
        p = <optimized out>
        len = <optimized out>
#2  0x00007fefc2c12658 in ldap_str2charray (str_in=str_in@entry=0x1 <Address
0x1 out of bounds>,
    brkstr=brkstr@entry=0x7fefc2c2282e ", ") at charray.c:188
        res = <optimized out>
        str = <optimized out>
        s = <optimized out>
        lasts = 0x7ffe7082824f ""
        i = <optimized out>
#3  0x00007fefc2c07b46 in ldap_url_parselist_int
(ludlist=ludlist@entry=0x7ffe708282d0,
    url=url@entry=0x1 <Address 0x1 out of bounds>, sep=0x7fefc2c2282e ", ",
sep@entry=0x0, flags=flags@entry=3)
    at url.c:1293
        i = <optimized out>
        rc = <optimized out>
        ludp = 0x28
        urls = <optimized out>
        __PRETTY_FUNCTION__ = "ldap_url_parselist_int"
#4  0x00007fefc2c07c75 in ldap_url_parselist_ext
(ludlist=ludlist@entry=0x7ffe708282d0,
    url=url@entry=0x1 <Address 0x1 out of bounds>, sep=sep@entry=0x0,
flags=flags@entry=3) at url.c:1324
No locals.
#5  0x00007fefc2c0a89b in ldap_set_option (ld=0x55f6dc442b30,
option=option@entry=20486, invalue=invalue@entry=0x1)
    at options.c:584
        urls = 0x1 <Address 0x1 out of bounds>
        ludlist = 0x0
        lo = 0x55f6dc4479e0
        dbglvl = 0x0
        rc = 0
        __PRETTY_FUNCTION__ = "ldap_set_option"
#6  0x00007fefc2bee2fb in ldap_initialize (ldp=ldp@entry=0x55f6dc4524a0,
url=0x1 <Address 0x1 out of bounds>)
    at open.c:245
        rc = <optimized out>
        ld = 0x55f6dc442b30
#7  0x00007fefc3e1c169 in ipadb_get_connection
(ipactx=ipactx@entry=0x55f6dc452470) at ipa_kdb.c:399
        tv = {tv_sec = 5, tv_usec = 0}
        res = 0x0
        first = <optimized out>
        ret = <optimized out>
        v3 = 22006
#8  0x00007fefc3e1ca20 in ipadb_check_connection (ipactx=0x55f6dc452470,
ipactx@entry=0x2) at ipa_kdb_common.c:164
No locals.
#9  ipadb_simple_search (ipactx=ipactx@entry=0x55f6dc452470,
    basedn=0x55f6dc447900 "cn=certmap,/var/kerberos/krb5kdc/principal",
scope=scope@entry=2,
    filter=filter@entry=0x7fefc3e2b8b8
"(&(objectClass=ipaCertMapRule)(ipaEnabledFlag=TRUE))",
    attrs=attrs@entry=0x7ffe708284c0, res=res@entry=0x7ffe708284a0) at
ipa_kdb_common.c:176
        ret = <optimized out>
#10 0x00007fefc3e27081 in ipa_get_init_data (moddata_out=0x55f6dc439f70,
kcontext=0x55f6dc452ef0)
    at ipa_kdb_certauth.c:160
        ret = <optimized out>
        prio = 32766
        ipactx = 0x55f6dc452470
        result = 0x0
        le = <optimized out>
        ctx = 0x0
        kerr = <optimized out>
        c = <optimized out>
        match_rule = 0x0
        domains = 0x0
        certmap_attrs = {0x7fefc3e2a6f8 "objectClass", 0x7fefc3e2b990
"ipaCertMapPriority",
          0x7fefc3e2b9a3 "ipaCertMapMatchRule", 0x7fefc3e2b9b7
"ipaCertMapMapRule",
---Type <return> to continue, or q <return> to quit---
          0x7fefc3e2b9c9 "associatedDomain", 0x7fefc3e2b9da "ipaEnabledFlag",
0x0}
        basedn = 0x55f6dc447900 "cn=certmap,/var/kerberos/krb5kdc/principal"
        lc = <optimized out>
        map_rule = 0x0
#11 ipa_certauth_authorize (context=0x55f6dc452ef0, moddata=0x55f6dc439f70,
    cert=0x55f6dc4482c0 "0\202\003r0\202\002?\003\002\001\002\002\t",
cert_len=886, princ=<optimized out>,
    opts=<optimized out>, db_entry=0x55f6dc43c880, authinds_out=0x7ffe70828638)
at ipa_kdb_certauth.c:280
        cert_filter = 0x0
        domains = 0x0
        ret = <optimized out>
        c = <optimized out>
        principal = 0x0
        auth_inds = 0x0
        res = 0x0
        kerr = <optimized out>
        lentry = 0x0
#12 0x00007fefc4abfd0d in authorize_cert (client=<optimized out>,
rock=0x55f6dc4550c0,
    cb=0x55f6da9d9020 <callbacks>, reqctx=0x55f6dc43cab0,
plgctx=0x55f6dc425d30, certauth_modules=<optimized out>,
    context=0x55f6dc452ef0) at pkinit_srv.c:367
        opts = {cb = 0x55f6da9d9020 <callbacks>, rock = 0x55f6dc4550c0, plgctx
= 0x55f6dc425d30,
          reqctx = 0x55f6dc43cab0}
        cert = 0x55f6dc4482c0 "0\202\003r0\202\002?\003\002\001\002\002\t"
        ais = 0x0
        ret = <optimized out>
        h = 0x55f6dc439f30
        db_ent = 0x0
        ai = <optimized out>
        accepted = 0
        i = <optimized out>
        cert_len = 886
#13 pkinit_server_verify_padata (context=0x55f6dc452ef0, req_pkt=<optimized
out>, request=<optimized out>,
    enc_tkt_reply=0x55f6dc454f88, data=0x55f6dc4543b0, cb=0x55f6da9d9020
<callbacks>, rock=0x55f6dc4550c0,
    moddata=0x55f6dc40b2c0, respond=0x55f6da7c71a0 <finish_verify_padata>,
arg=0x55f6dc43eef0) at pkinit_srv.c:507
        retval = 0
        authp_data = {magic = 0, length = 943,
          data = 0x55f6dc443450 "0\202\003\253\240<0:\240\005\002\003\001\036s\
241\021\030\017\062\060\061\067\061\060\062\064\061\064\063\062\065\063Z\242\00
6\002\004\031\336My\243\026\004\024\001\362T\020\274eo\036H\202x\355\071\215)\0
35\314\307\346?\202\003+0\202\003'0\202\002\031\006\a*\206H\316>\002\001\060\20
2\002\f\002\202\001\001"}
        krb5_authz = {magic = 0, length = 504,
          data = 0x55f6dc4480c0 "0\202\001\364\060\202\001\004\200o0m1\v0\t\006
\003U\004\006\023\002CZ1\020\060\016\006\003U\004\b\f\aMoravia1\r0\v\006\003U\0
04\a\f\004Brno1\031\060\027\006\003U\004\n\f\020DummyCompany Ltd1\022\060\020\0
06\003U\004\v\f\tdummyunit1\016\060\f\006\003U\004\003\f\005alice\201y0w0j1\v0\
t\006\003U\004\006\023\002CZ1\020\060\016\006\003U\004\b\f\aMoravia1\r0\v\006\0
03U\004\a\f\004Brno1\031\060\027\006\003U\004\n\f\020DummyCompany Ltd"...}
        reqp = 0x55f6dc43eac0
        reqp9 = 0x0
        auth_pack = 0x0
        auth_pack9 = 0x0
        plgctx = 0x55f6dc425d30
        reqctx = 0x55f6dc43cab0
        cksum = {magic = 0, checksum_type = 0, length = 0, contents = 0x0}
        der_req = 0x0
        k5data = {magic = 32, length = 2495,
          data = 0x55f6dc4543d0 "0\202\t\273\200\202\b\305\060\202\b\301\006\t*
\206H\206\367\r\001\a\002\240\202\b\262\060\202\b\256\002\001\003\061\v0\t\006\
005+\016\003\002\032\005"}
        is_signed = 1
        e_data = 0x0
        modreq = 0x0
        sp = <optimized out>
#14 0x000055f6da7c7123 in next_padata (state=<optimized out>) at
kdc_preauth.c:1209
        __PRETTY_FUNCTION__ = "next_padata"
#15 0x000055f6da7be7d5 in process_as_req (request=<optimized out>,
req_pkt=req_pkt@entry=0x55f6dc43b1f8,
    from=from@entry=0x55f6dc453628, kdc_active_realm=0x55f6dc405300,
vctx=vctx@entry=0x55f6dc415a20,
---Type <return> to continue, or q <return> to quit---
    respond=respond@entry=0x55f6da7bca00 <finish_dispatch_cache>,
arg=arg@entry=0x55f6dc43a200) at do_as_req.c:819
        errcode = <optimized out>
        s_flags = <optimized out>
        encoded_req_body = {magic = 4, length = 151, data = 0x55f6dc455ccc
"0\201\224\240\a\003\005"}
        useenctype = <optimized out>
        au_state = 0x55f6dc43c6d0
#16 0x000055f6da7bcd22 in dispatch (cb=0x55f6da9d92c0 <shandle>,
local_saddr=<optimized out>, from=0x55f6dc453628,
    pkt=pkt@entry=0x55f6dc43b1f8, is_tcp=is_tcp@entry=1,
vctx=vctx@entry=0x55f6dc415a20,
    respond=respond@entry=0x55f6da7d00f0 <process_tcp_response>,
arg=arg@entry=0x55f6dc43b170) at dispatch.c:190
        retval = <optimized out>
        as_req = 0x55f6dc4542c0
        response = 0x0
        kdc_err_context = 0x55f6dc402200
#17 0x000055f6da7d03d0 in process_tcp_connection_read (ctx=0x55f6dc415a20,
ev=0x55f6dc4536d0) at net-server.c:1409
        local_saddrlen = 16
        local_saddrp = <optimized out>
        state = 0x55f6dc43b170
        conn = <optimized out>
        nread = <optimized out>
        len = 2719
#18 0x00007fefcc0a6cd8 in verto_fire (ev=0x55f6dc4536d0) at verto.c:947
        priv = <optimized out>
        __PRETTY_FUNCTION__ = "verto_fire"
#19 0x00007fefc4ce6a14 in event_process_active_single_queue
(activeq=0x55f6dc425770, base=0x55f6dc425340)
    at event.c:1350
        ev = 0x55f6dc453730
        count = 1
#20 event_process_active (base=<optimized out>) at event.c:1420
        activeq = 0x55f6dc425770
        i = 1
        c = 0
#21 event_base_loop (base=0x55f6dc425340, flags=0) at event.c:1621
        evsel = 0x7fefc4f1bbe0 <epollops>
        tv = {tv_sec = 94518715951064, tv_usec = 94515050315781}
        tv_p = <optimized out>
        res = <optimized out>
        done = 0
        retval = 0
        __func__ = "event_base_loop"
#22 0x000055f6da7bb9ff in main (argc=2, argv=0x7ffe70828c88) at main.c:1065
        retval = <optimized out>
        kcontext = 0x55f6dc402200
        realm = <optimized out>
        ctx = 0x55f6dc415a20
        tcp_listen_backlog = 5
        i = <optimized out>