Bug 33904 - Samba 4 segmentation fault in DRS replication
Samba 4 segmentation fault in DRS replication
Status: RESOLVED WONTFIX
Product: UCS
Classification: Unclassified
Component: Samba4
UCS 3.2
Other Linux
: P5 normal (vote)
: ---
Assigned To: Samba maintainers
:
Depends on:
Blocks:
  Show dependency treegraph
 
Reported: 2014-01-13 07:08 CET by Stefan Gohmann
Modified: 2017-04-20 19:59 CEST (History)
1 user (show)

See Also:
What kind of report is it?: Bug Report
What type of bug is this?: 5: Major Usability: Impairs usability in key scenarios
Who will be affected by this bug?: 1: Will affect a very few installed domains
How will those affected feel about the bug?: 4: A User would return the product
User Pain: 0.114
Enterprise Customer affected?:
School Customer affected?:
ISV affected?:
Waiting Support:
Flags outvoted (downgraded) after PO Review:
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Max CVSS v3 score:


Attachments
core (31.73 MB, application/x-core)
2014-01-13 07:08 CET, Stefan Gohmann
Details
core (31.73 MB, application/x-core)
2014-01-13 07:08 CET, Stefan Gohmann
Details
samba.log (4.03 MB, application/text)
2014-01-13 07:09 CET, Stefan Gohmann
Details
drsuapi_DsGetNCChanges.log (256.30 KB, text/plain)
2014-01-13 14:14 CET, Arvid Requate
Details

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Description Stefan Gohmann univentionstaff 2014-01-13 07:08:17 CET
Created attachment 5727 [details]
core

From time to time the DRS replication stops working in the S4 backup test run: Bug #33050

It seems that it is triggered by the case tests/10_ldap/61getent_crash.

The bt full output from gdb (the gdb version is from squeeze-backports):

[New LWP 10350]
[Thread debugging using libthread_db enabled]
Core was generated by `samba -i -M single'.
Program terminated with signal 6, Aborted.
#0  0x00007f1f31cab1b5 in raise () from /lib/libc.so.6
#0  0x00007f1f31cab1b5 in raise () from /lib/libc.so.6
No symbol table info available.
#1  0x00007f1f31cadfc0 in abort () from /lib/libc.so.6
No symbol table info available.
#2  0x00007f1f35c83cb0 in smb_panic_default (why=<optimized out>) at ../lib/util/fault.c:149
No locals.
#3  smb_panic (why=0x7f1f35c9007b "internal error") at ../lib/util/fault.c:162
No locals.
#4  0x00007f1f35c83e82 in fault_report (sig=<optimized out>) at ../lib/util/fault.c:77
        counter = 1
#5  sig_fault (sig=11) at ../lib/util/fault.c:88
No locals.
#6  <signal handler called>
No symbol table info available.
#7  0x00007f1f2038e783 in replmd_check_urgent_objectclass (objectclass_el=0x0, situation=REPL_URGENT_ON_UPDATE) at ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:205
        j = 2
#8  0x00007f1f20394c89 in replmd_update_rpmd (module=<optimized out>, schema=<optimized out>, req=<optimized out>, rename_attrs=<optimized out>, msg=0x7f1f376cac90, seq_num=<optimized out>, t=1389593127, is_urgent=0x7fff695ae6cf, rodc=0x7fff695ae6ce) at ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:1432
        omd_value = <optimized out>
        ndr_err = <optimized out>
        omd = {version = 0, reserved = 0, ctr = {ctr1 = {count = 843032434, reserved = 32543, array = 0x7f1f32621219}}}
        i = <optimized out>
        now = <optimized out>
        our_invocation_id = 0x7f1f378f8f30
        ret = <optimized out>
        attrs = 0x7fff695ae600
        attrs1 = {0x7f1f2039a1b0 "replPropertyMetaData", 0x7f1f2039a352 "*", 0x0}
        attrs2 = {0x7f1f2039a1a5 "uSNChanged", 0x7f1f2039a346 "objectClass", 0x7f1f2039a144 "instanceType", 0x0}
        res = 0x7f1f37d11c10
        ldb = 0x7f1f36c39690
        objectclass_el = 0x0
        situation = REPL_URGENT_ON_UPDATE
        __FUNCTION__ = "replmd_update_rpmd"
#9  0x00007f1f20398b59 in replmd_modify (module=0x7f1f36cc1830, req=0x7f1f3771aba0) at ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:2455
        ldb = <optimized out>
        ac = <optimized out>
        down_req = <optimized out>
        msg = 0x7f1f376cac90
        t = 1389593127
        ret = <optimized out>
        is_urgent = false
        rodc = false
        guid_blob = <optimized out>
        sd_propagation_control = <optimized out>
#10 0x00007f1f232151e4 in dsdb_module_modify (module=0x7f1f36cc1830, message=<optimized out>, dsdb_flags=4194304, parent=0x7f1f377665e0) at ../source4/dsdb/samdb/ldb_modules/util.c:447
        ops = 0x0
        mod_req = 0x7f1f3771aba0
        ret = 0
        ldb = 0x7f1f36c39690
        tmp_ctx = <optimized out>
        __FUNCTION__ = "dsdb_module_modify"
#11 0x00007f1f20391fc6 in replmd_delete_internals (module=0x7f1f36cc1830, req=0x7f1f377665e0, re_delete=<optimized out>) at ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:3309
        ret = <optimized out>
        retb = <optimized out>
        old_dn = 0x7f1f376cad10
        new_dn = 0x7f1f37d11fc0
        rdn_name = 0x7f1f377f6ae0 "cn"
        rdn_value = 0x7f1f3776a8f8
        new_rdn_value = 0x7fff695ae840
        guid = {time_low = 940274416, time_mid = 32543, time_hi_and_version = 0, clock_seq = ")\204", node = "`2\037\177\000"}
        ldb = 0x7f1f36c39690
        schema = 0x7f1f3865a0e0
        msg = 0x7f1f3776aab0
        old_msg = <optimized out>
        el = 0x7f1f37769850
        tmp_ctx = 0x7f1f377f69d0
        res = 0x7f1f377626d0
        parent_res = 0x7fff695aea40
        preserved_attrs = {0x7f1f2039a4d5 "nTSecurityDescriptor", 0x7f1f2039a516 "attributeID", 0x7f1f2039a522 "attributeSyntax", 0x7f1f2039a532 "dNReferenceUpdate", 0x7f1f2039a544 "dNSHostName", 0x7f1f2039a550 "flatName", 0x7f1f2039a559 "governsID", 0x7f1f2039a563 "groupType", 0x7f1f2039a144 "instanceType", 0x7f1f2039a56d "lDAPDisplayName", 0x7f1f2039a57d "legacyExchangeDN", 0x7f1f2039a018 "isDeleted", 0x7f1f2039a022 "isRecycled", 0x7f1f2039a268 "lastKnownParent", 0x7f1f2039a278 "msDS-LastKnownRDN", 0x7f1f2039a58e "mS-DS-CreatorSID", 0x7f1f2039a59f "mSMQOwnerID", 0x7f1f2039a5ab "nCName", 0x7f1f2039a346 "objectClass", 0x7f1f2039a5b2 "distinguishedName", 0x7f1f2039a183 "objectGUID", 0x7f1f2039a5c4 "objectSid", 0x7f1f2039a5ce "oMSyntax", 0x7f1f2039a5d7 "proxiedObjectName", 0x7f1f2039a1f4 "name", 0x7f1f2039a1b0 "replPropertyMetaData", 0x7f1f2039a5e9 "sAMAccountName", 0x7f1f2039a5f8 "securityIdentifier", 0x7f1f2039a60b "sIDHistory", 0x7f1f2039a616 "subClassOf", 0x7f1f2039a22f "systemFlags", 0x7f1f2039a621 "trustPartner", 0x7f1f2039a62e "trustDirection", 0x7f1f2039a63d "trustType", 0x7f1f2039a647 "trustAttributes", 0x7f1f2039a657 "userAccountControl", 0x7f1f2039a1a5 "uSNChanged", 0x7f1f2039a19a "uSNCreated", 0x7f1f2039a480 "whenCreated", 0x7f1f2039a18e "whenChanged", 0x0}
        i = <optimized out>
        el_count = 918764704
        deletion_state = OBJECT_TOMBSTONE
        next_deletion_state = OBJECT_TOMBSTONE
        __FUNCTION__ = "replmd_delete_internals"
#12 0x00007f1f20392d39 in replmd_replicated_apply_isDeleted (ar=0x7f1f380b7db0) at ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:4718
        del_req = 0x7f1f377665e0
        tmp_ctx = <optimized out>
        deleted_objects_dn = 0x7f1f37761a50
        msg = <optimized out>
        ret = 0
#13 0x00007f1f20392fde in replmd_op_callback (req=<optimized out>, ares=0x7f1f380bb6a0) at ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:526
        ret = <optimized out>
        ac = 0x7f1f380b7db0
        modified_partition = 0x7f1f31d8c220
        partition_ctrl = 0x7f1f3742dd10
        controls = 0x0
        __FUNCTION__ = "replmd_op_callback"
#14 0x00007f1f20390fb5 in replmd_op_possible_conflict_callback (req=0x7f1f3788a0a0, ares=0x7f1f38235f40, callback=0x7f1f20392e60 <replmd_op_callback>) at ../source4/dsdb/samdb/ldb_modules/repl_meta_data.c:3606
        conflict_dn = <optimized out>
        res = <optimized out>
        attrs = {0x7f1f2039a1b0 "replPropertyMetaData", 0x7f1f2039a183 "objectGUID", 0x0}
        ret = <optimized out>
        omd_value = <optimized out>
        omd = {version = 0, reserved = 0, ctr = {ctr1 = {count = 835648624, reserved = 32543, array = 0x7f1f3742dd10}}}
        rmd = <optimized out>
        ndr_err = <optimized out>
        rodc = <optimized out>
        rmd_name = <optimized out>
        omd_name = <optimized out>
        msg = <optimized out>
        __FUNCTION__ = "replmd_op_possible_conflict_callback"
#15 0x00007f1f1ca64922 in ?? () from /usr/lib//ldb/modules/ldb/tdb.so
No symbol table info available.
#16 0x00007f1f31fe3094 in tevent_common_loop_timer_delay () from /usr/lib/libtevent.so.0
No symbol table info available.
#17 0x00007f1f31fe3fcb in ?? () from /usr/lib/libtevent.so.0
No symbol table info available.
#18 0x00007f1f31fe26d6 in ?? () from /usr/lib/libtevent.so.0
No symbol table info available.
#19 0x00007f1f31fde8bd in _tevent_loop_once () from /usr/lib/libtevent.so.0
No symbol table info available.
#20 0x00007f1f3261f195 in ldb_wait () from /usr/lib/libldb.so.1
No symbol table info available.
#21 0x00007f1f3261f91b in ldb_extended () from /usr/lib/libldb.so.1
No symbol table info available.
#22 0x00007f1f3337d1d5 in dsdb_replicated_objects_commit (ldb=0x7f1f36c39690, working_schema=0x0, objects=0x7f1f382ddc10, notify_uSN=0x7f1f37f82c30) at ../source4/dsdb/repl/replicated_objects.c:773
        ext_res = <optimized out>
        cur_schema = 0x0
        new_schema = <optimized out>
        ret = 0
        seq_num1 = <optimized out>
        seq_num2 = <optimized out>
        used_global_schema = false
        tmp_ctx = 0x7f1f371410b0
        __FUNCTION__ = "dsdb_replicated_objects_commit"
#23 0x00007f1f26b58fda in dreplsrv_op_pull_source_apply_changes_trigger (ctr6=<optimized out>, ctr1=<optimized out>, ctr_level=<optimized out>, r=<optimized out>, req=<optimized out>) at ../source4/dsdb/repl/drepl_out_helpers.c:717
        state = 0x7f1f36f71000
        rf1 = {blobsize = 274, consecutive_sync_failures = 0, last_success = 130339146210000000, last_attempt = 130340667260000000, result_last_attempt = {w = 0}, other_info = 0x7f1f37655f40, other_info_length = 66, replica_flags = 116, schedule = '\021' <repeats 84 times>, reserved = 0, highwatermark = {tmp_highest_usn = 5604, reserved_usn = 0, highest_usn = 5068}, source_dsa_obj_guid = {time_low = 618272083, time_mid = 53081, time_hi_and_version = 16778, clock_seq = "\273\060", node = "\005S\261\237\243", <incomplete sequence \357>}, source_dsa_invocation_id = {time_low = 3851307759, time_mid = 43312, time_hi_and_version = 17618, clock_seq = "\260\242", node = "\210;k\331\071S"}, transport_guid = {time_low = 0, time_mid = 0, time_hi_and_version = 0, clock_seq = "\000", node = "\000\000\000\000\000"}}
        service = 0x7f1f3833d090
        linked_attributes_count = 0
        linked_attributes = 0x0
        dsdb_repl_flags = <optimized out>
        partition = <optimized out>
        drsuapi = 0x7f1f37d6cc00
        schema = 0x7f1f3865a0e0
        first_object = 0x7f1f37b9fab0
        uptodateness_vector = 0x0
        status = {w = 0}
        nt_status = <optimized out>
        working_schema = 0x0
        mapping_ctr = 0x7f1f37e11730
        object_count = 133
        objects = 0x7f1f382ddc10
        more_data = true
#24 dreplsrv_op_pull_source_get_changes_done (subreq=<optimized out>) at ../source4/dsdb/repl/drepl_out_helpers.c:599
        req = 0x7f1f371e1df0
        state = <optimized out>
        status = <optimized out>
        r = 0x7f1f373604c0
        ctr_level = <optimized out>
        ctr1 = <optimized out>
        ctr6 = <optimized out>
        extended_ret = <optimized out>
#25 0x00007f1f32a5270c in dcerpc_binding_handle_call_done (subreq=0x7f1f37072820) at ../librpc/rpc/binding_handle.c:492
        req = <optimized out>
        state = <optimized out>
        h = 0x7f1f3786bf90
        error = {v = 0}
        out_flags = <optimized out>
        ndr_err = <optimized out>
#26 0x00007f1f31fdf4e9 in tevent_common_loop_immediate () from /usr/lib/libtevent.so.0
No symbol table info available.
#27 0x00007f1f31fe3fbf in ?? () from /usr/lib/libtevent.so.0
No symbol table info available.
#28 0x00007f1f31fe26d6 in ?? () from /usr/lib/libtevent.so.0
No symbol table info available.
#29 0x00007f1f31fde8bd in _tevent_loop_once () from /usr/lib/libtevent.so.0
No symbol table info available.
#30 0x00007f1f31fde93b in tevent_common_loop_wait () from /usr/lib/libtevent.so.0
No symbol table info available.
#31 0x00007f1f31fe2646 in ?? () from /usr/lib/libtevent.so.0
No symbol table info available.
#32 0x00007f1f362df369 in binary_smbd_main (argc=<optimized out>, argv=<optimized out>, binary_name=<optimized out>) at ../source4/smbd/server.c:512
        opt_daemon = <optimized out>
        opt_interactive = <optimized out>
        opt = <optimized out>
        pc = <optimized out>
        static_init = {0x7f1f34ddbd40 <server_service_auth_init>, 0x7f1f34ddd7b0 <server_service_echo_init>, 0}
        shared_init = <optimized out>
        event_ctx = <optimized out>
        status = <optimized out>
        model = <optimized out>
        max_runtime = 0
        st = {st_dev = 10, st_ino = 3, st_nlink = 1, st_mode = 8592, st_uid = 0, st_gid = 5, __pad0 = 0, st_rdev = 34816, st_size = 0, st_blksize = 1024, st_blocks = 0, st_atim = {tv_sec = 1389593104, tv_nsec = 936000000}, st_mtim = {tv_sec = 1389593104, tv_nsec = 936000000}, st_ctim = {tv_sec = 1389592355, tv_nsec = 936000000}, __unused = {0, 0, 0}}
        long_options = {{longName = 0x0, shortName = 0 '\000', argInfo = 4, arg = 0x7f1f323f2d60, val = 0, descrip = 0x7f1f362e1ed8 "Help options:", argDescrip = 0x0}, {longName = 0x7f1f362e1ee6 "daemon", shortName = 68 'D', argInfo = 0, arg = 0x0, val = 1000, descrip = 0x7f1f362e1eed "Become a daemon (default)", argDescrip = 0x0}, {longName = 0x7f1f362e1f07 "interactive", shortName = 105 'i', argInfo = 0, arg = 0x0, val = 1001, descrip = 0x7f1f362e23b8 "Run interactive (not a daemon)", argDescrip = 0x0}, {longName = 0x7f1f362e1f22 "model", shortName = 77 'M', argInfo = 1, arg = 0x0, val = 1002, descrip = 0x7f1f362e1f13 "Select process model", argDescrip = 0x7f1f362e1f28 "MODEL"}, {longName = 0x7f1f362e1f2e "maximum-runtime", shortName = 0 '\000', argInfo = 2, arg = 0x7fff695af5fc, val = 0, descrip = 0x7f1f362e23d8 "set maximum runtime of the server process, till autotermination", argDescrip = 0x7f1f362e1f3e "seconds"}, {longName = 0x7f1f362e1f46 "show-build", shortName = 98 'b', argInfo = 0, arg = 0x0, val = 1003, descrip = 0x7f1f362e1f51 "show build info", argDescrip = 0x0}, {longName = 0x0, shortName = 0 '\000', argInfo = 4, arg = 0x7f1f364e4d60, val = 0, descrip = 0x7f1f362e1f61 "Common Samba options:", argDescrip = 0x0}, {longName = 0x0, shortName = 0 '\000', argInfo = 4, arg = 0x7f1f364e4f20, val = 0, descrip = 0x7f1f362e1f77 "Version options:", argDescrip = 0x0}, {longName = 0x0, shortName = 0 '\000', argInfo = 0, arg = 0x0, val = 0, descrip = 0x0, argDescrip = 0x0}}
#33 0x00007f1f31c97c8d in __libc_start_main () from /lib/libc.so.6
No symbol table info available.
#34 0x00007f1f362db5f9 in _start ()
No symbol table info available.
Comment 1 Stefan Gohmann univentionstaff 2014-01-13 07:08:54 CET
Created attachment 5728 [details]
core
Comment 2 Stefan Gohmann univentionstaff 2014-01-13 07:09:48 CET
Created attachment 5729 [details]
samba.log

Samba logfile with debug level 12. I've started the samba process with "-i -M single".
Comment 3 Arvid Requate univentionstaff 2014-01-13 10:38:29 CET
in replmd_check_urgent_objectclass

objectclass_el=0x0

source4/dsdb/samdb/ldb_modules/repl_meta_data.c:205: objectclass_el->num_values
Comment 4 Arvid Requate univentionstaff 2014-01-13 11:27:35 CET
The dreplsrv server process crashed here because the attribute "objectclass" was not present in the data structure of the following object replicated from the master. It is present on the master though, so it's currently unclear why it didn't get replicated:
===============================================================================
# record 1
dn: cn=supergroup\0ADEL:84d4159b-4b1c-4b08-ba30-ded58028a0bd,CN=Deleted Objects,DC=autotest093,DC=local
objectClass: top
objectClass: group
instanceType: 4
whenCreated: 20140111115020.0Z
uSNCreated: 5067
objectGUID: 84d4159b-4b1c-4b08-ba30-ded58028a0bd
objectSid: S-1-5-21-406819353-333020689-3686141061-1375
sAMAccountName: supergroup
groupType: -2147483646
isDeleted: TRUE
lastKnownParent: CN=Groups,DC=autotest093,DC=local
isRecycled: TRUE
cn:: c3VwZXJncm91cApERUw6ODRkNDE1OWItNGIxYy00YjA4LWJhMzAtZGVkNTgwMjhhMGJk
name:: c3VwZXJncm91cApERUw6ODRkNDE1OWItNGIxYy00YjA4LWJhMzAtZGVkNTgwMjhhMGJk
whenChanged: 20140111115021.0Z
uSNChanged: 5069
distinguishedName: cn=supergroup\0ADEL:84d4159b-4b1c-4b08-ba30-ded58028a0bd,CN
 =Deleted Objects,DC=autotest093,DC=local
===============================================================================
Comment 5 Arvid Requate univentionstaff 2014-01-13 12:04:14 CET
The samba.log shows that is due to an earlier add operation (uSNChanged: 4609) which lacked the objectClass:
==============================================================================
DRS replication add message:
dn: cn=supergroup\0ADEL:84d4159b-4b1c-4b08-ba30-ded58028a0bd,CN=Deleted Objects,DC=autotest093,DC=local
changetype: add
cn:: c3VwZXJncm91cApERUw6ODRkNDE1OWItNGIxYy00YjA4LWJhMzAtZGVkNTgwMjhhMGJk
instanceType: 4
whenChanged: 20140111115021.0Z
uSNCreated: 4609
isDeleted: TRUE
uSNChanged: 4609
name:: c3VwZXJncm91cApERUw6ODRkNDE1OWItNGIxYy00YjA4LWJhMzAtZGVkNTgwMjhhMGJk
objectGUID: 84d4159b-4b1c-4b08-ba30-ded58028a0bd
replPropertyMetaData:: AQAAAAAAAAAIAAAAAAAAAAEAAgABAAAA/MDhCAMAAADvSo7lMKnSRLC
 iiDtr2TlTyxMAAAAAAAABEgAAAAAAADAAAgABAAAA/cDhCAMAAADvSo7lMKnSRLCiiDtr2TlTzRMA
 AAAAAAABEgAAAAAAAAEACQACAAAA/cDhCAMAAADvSo7lMKnSRLCiiDtr2TlTzRMAAAAAAAABEgAAA
 AAAAC4BCQADAAAA/cDhCAMAAADvSo7lMKnSRLCiiDtr2TlTzRMAAAAAAAABEgAAAAAAAA0DCQABAA
 AA/cDhCAMAAADvSo7lMKnSRLCiiDtr2TlTzRMAAAAAAAABEgAAAAAAAA4DCQACAAAA/cDhCAMAAAD
 vSo7lMKnSRLCiiDtr2TlTzRMAAAAAAAABEgAAAAAAAAoICQABAAAA/cDhCAMAAADvSo7lMKnSRLCi
 iDtr2TlTzRMAAAAAAAABEgAAAAAAAAMAAAACAAAA/cDhCAMAAADvSo7lMKnSRLCiiDtr2TlTzRMAA
 AAAAAABEgAAAAAAAA==
lastKnownParent: <GUID=aeb34709-b4cd-47f0-9b7b-e3876e4bcd78>;CN=Groups,DC=auto
 test093,DC=local
isRecycled: TRUE
==============================================================================
Comment 6 Arvid Requate univentionstaff 2014-01-13 12:25:38 CET
ucs-test.log shows 267 delete operations on this opbject and there are 66 cn=supergroup objects under "Deleted Objects" on the DC backup. So, this probably was delete operation #67 of 267, which seems to support the initial assumption that this might be caused by a race condition.
Comment 7 Arvid Requate univentionstaff 2014-01-13 14:14:41 CET
Created attachment 5730 [details]
drsuapi_DsGetNCChanges.log

This is the list of changes the master sends, and objectClass is not part of that. Looks like the master thinks the backup already got the objectClass:

* The master shows highest_usn = 5068 in its uptodateness vector, probably that's the state of replication for backup093.

* The current object has some attribtes with USN = 5067 and some with usn = 5069.

* The objectClass attribute has originating_usn = 5067, local_usn = 5067, so it isn't considered in the replication. The whole object was created at USN 5067.


Simply patching the segfault on the receiver side (backup093) will not fix the general issue here. But it's probably pretty hard to determine the root cause for this situation.
Comment 8 Arvid Requate univentionstaff 2014-01-23 13:31:49 CET
A similar segfault occured again on Bug 33977, which promted an upstream patch. This should fix the segfault also in this case, but as explained above, this doesn't address the original usnChanged issue.
Comment 9 Arvid Requate univentionstaff 2014-01-30 15:55:22 CET
All objects lacking objectClass in hte domain of Ticket# 2014011421000077 have been "\0ADEL:" objects. Significant statistical bias.
Comment 10 Arvid Requate univentionstaff 2017-04-20 19:59:18 CEST
This issue has been filed against UCS 3.2 running Samba 4.1.0

UCS 3.2 is out of maintenance and many UCS components have vastly changed in
later releases. Thus, this issue is now being closed.

If this is still an issue in newer UCS versions, please use "Clone this bug".
In this case please provide detailed information on how this issue is affecting
you.