[Bug 1872118] Re: DHCP Cluster crashes after a few hours

[Jorge Niedbalski]

** Changed in: bind9-libs (Ubuntu Focal)
       Status: New => In Progress

** Changed in: bind9-libs (Ubuntu Groovy)
       Status: New => In Progress

** Changed in: isc-dhcp (Ubuntu Focal)
       Status: New => In Progress

** Changed in: isc-dhcp (Ubuntu Groovy)
       Status: Confirmed => In Progress

** Changed in: bind9-libs (Ubuntu Focal)
     Assignee: (unassigned) => Jorge Niedbalski (niedbalski)

** Changed in: bind9-libs (Ubuntu Groovy)
     Assignee: (unassigned) => Jorge Niedbalski (niedbalski)

** Changed in: isc-dhcp (Ubuntu Focal)
     Assignee: (unassigned) => Jorge Niedbalski (niedbalski)

** Changed in: isc-dhcp (Ubuntu Groovy)
     Assignee: (unassigned) => Jorge Niedbalski (niedbalski)

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https://bugs.launchpad.net/bugs/1872118

Title:
  DHCP Cluster crashes after a few hours

Status in DHCP:
  New
Status in bind9-libs package in Ubuntu:
  In Progress
Status in isc-dhcp package in Ubuntu:
  In Progress
Status in bind9-libs source package in Focal:
  In Progress
Status in isc-dhcp source package in Focal:
  In Progress
Status in bind9-libs source package in Groovy:
  In Progress
Status in isc-dhcp source package in Groovy:
  In Progress

Bug description:
  
  I have a pair of DHCP serevrs running in a cluster on ubuntu 20.04, All worked perfectly until recently, when they started stopping with code=killed, status=6/ABRT.
  This is being fixed by 

  https://bugs.launchpad.net/bugs/1870729

  However now one stops after a few hours with the following errors. One
  can stay on line but not both.


  
  Syslog shows 
  Apr 10 17:20:15 dhcp-primary sh[6828]: ../../../../lib/isc/unix/socket.c:3361: INSIST(!sock->pending_send) failed, back trace
  Apr 10 17:20:15 dhcp-primary sh[6828]: #0 0x7fbe78702a4a in ??
  Apr 10 17:20:15 dhcp-primary sh[6828]: #1 0x7fbe78702980 in ??
  Apr 10 17:20:15 dhcp-primary sh[6828]: #2 0x7fbe7873e7e1 in ??
  Apr 10 17:20:15 dhcp-primary sh[6828]: #3 0x7fbe784e5609 in ??
  Apr 10 17:20:15 dhcp-primary sh[6828]: #4 0x7fbe78621103 in ??

  
  nothing in kern.log

  
  apport.log shows
  ERROR: apport (pid 6850) Fri Apr 10 17:20:15 2020: called for pid 6828, signal 6, core limit 0, dump mode 2
  ERROR: apport (pid 6850) Fri Apr 10 17:20:15 2020: not creating core for pid with dump mode of 2
  ERROR: apport (pid 6850) Fri Apr 10 17:20:15 2020: executable: /usr/sbin/dhcpd (command line "dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf /etc/dhcp/dhcpd.conf")
  ERROR: apport (pid 6850) Fri Apr 10 17:20:15 2020: is_closing_session(): no DBUS_SESSION_BUS_ADDRESS in environment
  ERROR: apport (pid 6850) Fri Apr 10 17:20:15 2020: wrote report /var/crash/_usr_sbin_dhcpd.0.crash


  /var/crash/_usr_sbin_dhcpd.0.crash shows

  ProblemType: Crash
  Architecture: amd64
  CrashCounter: 1
  Date: Fri Apr 10 17:20:15 2020
  DistroRelease: Ubuntu 20.04
  ExecutablePath: /usr/sbin/dhcpd
  ExecutableTimestamp: 1586210315
  ProcCmdline: dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf /etc/dhcp/dhcpd.conf
  ProcEnviron: Error: [Errno 13] Permission denied: 'environ'
  ProcMaps: Error: [Errno 13] Permission denied: 'maps'
  ProcStatus:
   Name:  dhcpd
   Umask: 0022
   State: D (disk sleep)
   Tgid:  6828
   Ngid:  0
   Pid:   6828
   PPid:  1
   TracerPid:     0
   Uid:   113     113     113     113
   Gid:   118     118     118     118
   FDSize:        128
   Groups:
   NStgid:        6828
   NSpid: 6828
   NSpgid:        6828
   NSsid: 6828
   VmPeak:          236244 kB
   VmSize:          170764 kB
   VmLck:        0 kB
   VmPin:        0 kB
   VmHWM:    12064 kB
   VmRSS:    12064 kB
   RssAnon:           5940 kB
   RssFile:           6124 kB
   RssShmem:             0 kB
   VmData:           30792 kB
   VmStk:      132 kB
   VmExe:      592 kB
   VmLib:     5424 kB
   VmPTE:       76 kB
   VmSwap:               0 kB
   HugetlbPages:         0 kB
   CoreDumping:   1
   THP_enabled:   1
   Threads:       4
   SigQ:  0/7609
   SigPnd:        0000000000000000
   ShdPnd:        0000000000000000
   SigBlk:        0000000000000000
   SigIgn:        0000000000001000
   SigCgt:        0000000180000000
   CapInh:        0000000000000000
   CapPrm:        0000000000000000
   CapEff:        0000000000000000
   CapBnd:        0000003fffffffff
   CapAmb:        0000000000000000
   NoNewPrivs:    0
   Seccomp:       0
   Speculation_Store_Bypass:      thread vulnerable
   Cpus_allowed:  3
   Cpus_allowed_list:     0-1
   Mems_allowed:  00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,0000
  0000,00000000,00000000,00000001
   Mems_allowed_list:     0
   voluntary_ctxt_switches:       111
   nonvoluntary_ctxt_switches:    144
  Signal: 6
  Uname: Linux 5.4.0-21-generic x86_64
  UserGroups:

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