[ZBX-15781] Zabbix problem with SMTP authentication Created: 2019 Mar 07  Updated: 2019 Mar 10  Resolved: 2019 Mar 08

Status: Closed
Project: ZABBIX BUGS AND ISSUES
Component/s: Server (S)
Affects Version/s: 4.2.0beta2
Fix Version/s: None

Type: Problem report Priority: Blocker
Reporter: SuNova Assignee: Arturs Lontons
Resolution: Duplicate Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Attachments: PNG File Capture.PNG     File zabbix.rar     File zabbix_server.log    
Issue Links:
Duplicate
duplicates ZBX-10461 Zabbix (alerter process) crash on Cen... Closed

 Description   

Hello

Please first see zabbix_log I attached.
How did this happen and how it is fixed?

Before we were using smtp with no authentication because all warning mails we were sending were being sent to the same mail server (organization domain).

Recently we had a problem which was requiring sending emails to some people outside the organization.  
So we set Authentication to Username and password (in media types section), then put `[email protected]' as username and some password consisting of `#` and `@`.

As soon as that special problem happened, zabbix_server crashed.

 Comments   
Comment by Edgar Akhmetshin [ 2019 Mar 07 ]

Hello SuNove,

Please, provide operating system info (name and version), installation type (from sources or from packages), media type settings used and full password example with all characters. Also attach: 

ldd $(which zabbix_server)
objdump -DSswx $(which zabbix_server)

Regards,
Edgar

Comment by SuNova [ 2019 Mar 07 ]

Hello Edgar,

Here we go:

[root@LCT-MON-Zabbix ~]# uname -a
Linux LCT-MON-Zabbix 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
[root@LCT-MON-Zabbix ~]# cat /etc/centos-release
CentOS Linux release 7.6.1810 (Core)
[root@LCT-MON-Zabbix ~]# yum list zabbix-server*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror.alastyr.com
 * epel: mirror.hoster.kz
 * extras: mirror.fibersunucu.com.tr
 * ius: ftp.upcnet.ro
 * updates: mirror.netdirekt.com.tr
Installed Packages
zabbix-server-pgsql.x86_64                                                 4.2.0-0.4beta2.el7                                                  @zabbix                                                  zabbix
[root@LCT-MON-Zabbix ~]# ldd $(which zabbix_server)
        linux-vdso.so.1 =>  (0x00007ffff86f6000)
        libpq.so.5 => /usr/pgsql-11/lib/libpq.so.5 (0x00007f000a4bc000)
        libiksemel.so.3 => /lib64/libiksemel.so.3 (0x00007f000a2ae000)
        libxml2.so.2 => /lib64/libxml2.so.2 (0x00007f0009f44000)
        libodbc.so.2 => /lib64/libodbc.so.2 (0x00007f0009cdc000)
        libnetsnmp.so.31 => /lib64/libnetsnmp.so.31 (0x00007f00099da000)
        libssh2.so.1 => /lib64/libssh2.so.1 (0x00007f00097b0000)
        libOpenIPMI.so.0 => /lib64/libOpenIPMI.so.0 (0x00007f00094a3000)
        libOpenIPMIposix.so.0 => /lib64/libOpenIPMIposix.so.0 (0x00007f000929b000)
        libz.so.1 => /lib64/libz.so.1 (0x00007f0009085000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f0008e69000)
        libevent-2.0.so.5 => /lib64/libevent-2.0.so.5 (0x00007f0008c21000)
        libssl.so.10 => /lib64/libssl.so.10 (0x00007f00089af000)
        libcrypto.so.10 => /lib64/libcrypto.so.10 (0x00007f000854e000)
        libldap-2.4.so.2 => /lib64/libldap-2.4.so.2 (0x00007f00082f9000)
        liblber-2.4.so.2 => /lib64/liblber-2.4.so.2 (0x00007f00080ea000)
        libcurl.so.4 => /lib64/libcurl.so.4 (0x00007f0007e81000)
        libm.so.6 => /lib64/libm.so.6 (0x00007f0007b7f000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007f000797b000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f0007762000)
        libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f0007500000)
        libc.so.6 => /lib64/libc.so.6 (0x00007f0007133000)
        libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007f0006ee6000)
        libldap_r-2.4.so.2 => /lib64/libldap_r-2.4.so.2 (0x00007f0006c87000)
        libgnutls.so.28 => /lib64/libgnutls.so.28 (0x00007f000694d000)
        libgcrypt.so.11 => /lib64/libgcrypt.so.11 (0x00007f00066cc000)
        libgpg-error.so.0 => /lib64/libgpg-error.so.0 (0x00007f00064c7000)
        liblzma.so.5 => /lib64/liblzma.so.5 (0x00007f00062a1000)
        libltdl.so.7 => /lib64/libltdl.so.7 (0x00007f0006097000)
        libOpenIPMIutils.so.0 => /lib64/libOpenIPMIutils.so.0 (0x00007f0005e8d000)
        libgdbm.so.4 => /lib64/libgdbm.so.4 (0x00007f0005c84000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f000ac46000)
        libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007f000599b000)
        libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007f0005797000)
        libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007f0005564000)
        libsasl2.so.3 => /lib64/libsasl2.so.3 (0x00007f0005347000)
        libssl3.so => /lib64/libssl3.so (0x00007f00050f5000)
        libsmime3.so => /lib64/libsmime3.so (0x00007f0004ece000)
        libnss3.so => /lib64/libnss3.so (0x00007f0004ba1000)
        libnssutil3.so => /lib64/libnssutil3.so (0x00007f0004971000)
        libplds4.so => /lib64/libplds4.so (0x00007f000476d000)
        libplc4.so => /lib64/libplc4.so (0x00007f0004568000)
        libnspr4.so => /lib64/libnspr4.so (0x00007f000432a000)
        libidn.so.11 => /lib64/libidn.so.11 (0x00007f00040f7000)
        libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007f0003ee7000)
        libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007f0003ce3000)
        libp11-kit.so.0 => /lib64/libp11-kit.so.0 (0x00007f00039b4000)
        libtasn1.so.6 => /lib64/libtasn1.so.6 (0x00007f00037a1000)
        libnettle.so.4 => /lib64/libnettle.so.4 (0x00007f0003570000)
        libhogweed.so.2 => /lib64/libhogweed.so.2 (0x00007f0003349000)
        libgmp.so.10 => /lib64/libgmp.so.10 (0x00007f00030d1000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f0002e9a000)
        librt.so.1 => /lib64/librt.so.1 (0x00007f0002c92000)
        libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f0002a6b000)
        libffi.so.6 => /lib64/libffi.so.6 (0x00007f0002863000)
        libfreebl3.so => /lib64/libfreebl3.so (0x00007f0002660000)
[root@LCT-MON-Zabbix ~]# objdump -DSswx $(which zabbix_server) > /tmp/zabbix.dmp

Dump and shot are attached.
Password sample: 64@#8125AfBC&

zabbix.rar

Comment by Vladislavs Sokurenko [ 2019 Mar 07 ]

Backtrace for easier searching:

31360:20190307:091558.167 Got signal [signal:11(SIGSEGV),reason:1,refaddr:0x50]. Crashing ...
 31360:20190307:091558.168 === Backtrace: ===
 31360:20190307:091558.168 21: /usr/sbin/zabbix_server: alerter #3 started(zbx_backtrace+0x35) [0x5573d7a0d0d1]
 31360:20190307:091558.168 20: /usr/sbin/zabbix_server: alerter #3 started(zbx_log_fatal_info+0x119) [0x5573d7a0d2ec]
 31360:20190307:091558.168 19: /usr/sbin/zabbix_server: alerter #3 started(+0x18f601) [0x5573d7a0d601]
 31360:20190307:091558.168 18: /lib64/libpthread.so.0(+0xf5d0) [0x7f387b6835d0]
 31360:20190307:091558.168 17: /lib64/libnss3.so(PK11_DigestOp+0x1f) [0x7f38773e486f]
 31360:20190307:091558.168 16: /lib64/libcurl.so.4(+0x43dfa) [0x7f387a6cfdfa]
 31360:20190307:091558.168 15: /lib64/libcurl.so.4(+0x4fca9) [0x7f387a6dbca9]
 31360:20190307:091558.168 14: /lib64/libcurl.so.4(+0x49c38) [0x7f387a6d5c38]
 31360:20190307:091558.168 13: /lib64/libcurl.so.4(+0x4897e) [0x7f387a6d497e]
 31360:20190307:091558.168 12: /lib64/libcurl.so.4(+0x334d8) [0x7f387a6bf4d8]
 31360:20190307:091558.168 11: /lib64/libcurl.so.4(curl_multi_perform+0xd1) [0x7f387a6c03b1]
 31360:20190307:091558.168 10: /lib64/libcurl.so.4(curl_easy_perform+0xf3) [0x7f387a6b7623]
 31360:20190307:091558.168 9: /usr/sbin/zabbix_server: alerter #3 started(+0x19fff1) [0x5573d7a1dff1]
 31360:20190307:091558.168 8: /usr/sbin/zabbix_server: alerter #3 started(send_email+0x252) [0x5573d7a1e38e]
 31360:20190307:091558.168 7: /usr/sbin/zabbix_server: alerter #3 started(+0x4034a) [0x5573d78be34a]
 31360:20190307:091558.168 6: /usr/sbin/zabbix_server: alerter #3 started(alerter_thread+0x377) [0x5573d78bebd7]
 31360:20190307:091558.169 5: /usr/sbin/zabbix_server: alerter #3 started(zbx_thread_start+0x37) [0x5573d7a1a704]
 31360:20190307:091558.169 4: /usr/sbin/zabbix_server: alerter #3 started(MAIN_ZABBIX_ENTRY+0xaba) [0x5573d78bda5d]
 31360:20190307:091558.169 3: /usr/sbin/zabbix_server: alerter #3 started(daemon_start+0x31b) [0x5573d7a0c922]
 31360:20190307:091558.169 2: /usr/sbin/zabbix_server: alerter #3 started(main+0x312) [0x5573d78bcfa1]
 31360:20190307:091558.169 1: /lib64/libc.so.6(__libc_start_main+0xf5) [0x7f38799603d5]
 31360:20190307:091558.169 0: /usr/sbin/zabbix_server: alerter #3 started(+0x3e0a9) [0x5573d78bc0a9]

Looks like a duplicate of ZBX-10461

Comment by Arturs Lontons [ 2019 Mar 08 ]

Hi,

Closing as a duplicate of ZBX-10461. As per the comments in the duplicated ticket - For a potential solution, try using a different SSL backend for libcurl (OpenSSL or GnuTLS).

Comment by SuNova [ 2019 Mar 10 ]

Hi,

Well you are right, but in my personal opinion, this is about exception handling. I believe when alerter encounters such a failure, it should fail the action intended to be performed, not just getting crashed.

Also, even if alterter crashes, I believe parent process (zabbix_server) should not get stopped, especially in a mission critical enterprise level monitoring system like Zabbix. Monitoring a monitoring system is not even an option in my opinion. 

With warmest regards.

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