Kopano server fatal error when shutting down

genesis74

Hi there,

once a day I am shutting down kopano-server for a maintenance/backup script. This shutdown happens at 5 a.m. During routine check of server.log I found this entry every now and then (once in november, none in december, three times in january):

Wed Jan 23 05:00:02 2019: [warning] Shutting down
Wed Jan 23 05:00:03 2019: [crit   ] ----------------------------------------------------------------------
Wed Jan 23 05:00:03 2019: [crit   ] Fatal error detected. Please report all following information.
Wed Jan 23 05:00:03 2019: [crit   ] Application kopano-server version: 8.6.9
Wed Jan 23 05:00:03 2019: [crit   ] OS: Linux, release: 4.15.0-43-generic, version: #46-Ubuntu SMP Thu Dec 6 14:45:28 UTC 2018, hardware: x$
Wed Jan 23 05:00:03 2019: [crit   ] Thread name: ECScheduler:wor
Wed Jan 23 05:00:03 2019: [crit   ] Peak RSS: 58828
Wed Jan 23 05:00:03 2019: [crit   ] Pid 1215 caught SIGSEGV (11), traceback:
Wed Jan 23 05:00:03 2019: [crit   ] Backtrace:
Wed Jan 23 05:00:03 2019: [crit   ] #0. /usr/lib/libkcutil.so.0(+0x2a290) [0x7f0ad057e290]
Wed Jan 23 05:00:03 2019: [crit   ] #1. /usr/lib/libkcutil.so.0(+0x22a2d) [0x7f0ad0576a2d]
Wed Jan 23 05:00:03 2019: [crit   ] #2. /usr/lib/libkcutil.so.0(_ZN2KC23generic_sigsegv_handlerEPNS_8ECLoggerEPKcS3_iPK9siginfo_tPKv+0x1a3)$
Wed Jan 23 05:00:03 2019: [crit   ] #3. /lib/x86_64-linux-gnu/libpthread.so.0(+0x12890) [0x7f0ace939890]
Wed Jan 23 05:00:03 2019: [crit   ] #4. /usr/lib/libkcserver.so.0(+0x4d27a) [0x7f0acffd927a]
Wed Jan 23 05:00:03 2019: [crit   ] #5. /usr/lib/libkcserver.so.0(_ZN2KC17ECDatabaseFactory20CreateDatabaseObjectEPPNS_10ECDatabaseERNSt7__$
Wed Jan 23 05:00:03 2019: [crit   ] #6. /usr/lib/libkcserver.so.0(+0x4d4d0) [0x7f0acffd94d0]
Wed Jan 23 05:00:03 2019: [crit   ] #7. /usr/lib/libkcserver.so.0(+0x103df5) [0x7f0ad008fdf5]
Wed Jan 23 05:00:03 2019: [crit   ] #8. /usr/lib/libkcserver.so.0(_ZN2KC17SoftDeleteRemoverEPv+0x175) [0x7f0ad00dd0c5]
Wed Jan 23 05:00:03 2019: [crit   ] #9. /lib/x86_64-linux-gnu/libpthread.so.0(+0x76db) [0x7f0ace92e6db]
Wed Jan 23 05:00:03 2019: [crit   ] #10. /lib/x86_64-linux-gnu/libc.so.6(clone+0x3f) [0x7f0ace0b688f]
Wed Jan 23 05:00:03 2019: [crit   ] Signal errno: Erfolg, signal code: 1
Wed Jan 23 05:00:03 2019: [crit   ] Sender pid: 0, sender uid: 0, si_status: 0
Wed Jan 23 05:00:03 2019: [crit   ] Signal value: 0, faulting address: (nil)
Wed Jan 23 05:00:03 2019: [crit   ] When reporting this traceback, please include Linux distribution name (and version), system architecture and Kopano version.

When this happens, server shutdown needs around 10 sec instead of normally 1 sec (in the quoted example, the maintenance script continues at 5:00:12). Besides that, I did not notice any unexpected behaviour.

I stumbled over the thread Fatal error Kopano Server which is a few months old discussing a quite similar, but not identical log entry. Especially, relation to server shutdown is not mentioned there.

Ubuntu 18.04.1
Kopano Server 8.6.9 (looking back in the logs I found an entry back in november when running 8.6.8)

Log is asking me to report this which I am doing now. Thanks in advance for any advice on this.