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2879974 - signal 11 in np__connect_cb; maintenance tokens - SAP ASE


  • Connections on the DR secondary server of SAP ASE HADR setup,  assume  status: 'MAINTENANCE TOKEN' cmd and go into a stagnant state.

  • These connections do not clear on their own. They keep on accumulating and acquiring new such connections.

  • ASE runs out of connections as a result. Error 1601 is received in the ASE errorlog:

    Error: 1601, Severity: 17, State: 3 There are not enough 'user connections' available to start a new process. Retry when there are fewer active users, or ask your System Administrator to reconfigure ASE with more user connections

  • Following stacktrace error is reported in the ASE error log:

Current process (0x0) infected with signal 11 (SIGSEGV)
Current Process is running on a Non-Engine Thread
kernel Address 0x0x0000000002434e72 (np__connect_cb+0x22)
Run to completion task 'CtlibController' exiting

Run to completion task 0x0(0) exception 11
kernel  pc: 0x0000000001534691 nthrd_backtrace+0x3b()
kernel  pc: 0x0000000001559353 krtctskException+0xc4()
kernel  pc: 0x000000000156144e kisignal+0xa12()
kernel  pc: 0x00000000024354c2 np__connect_cb+0x22()
kernel  pc: 0x00000000024586d6 sybnet__async_poll+0x346()
Run to completion task 'CtlibController' exiting.

  • Above errors may also occur on the Primary ASE resulting an unplanned failover



  • SAP Adaptive Server Enterprise 16.0 SP03 PL07 (ASE)
  • SAP Adaptive Server Enterprise 16.0 SP03 PL07 for Business Suite
  • SAP Replication Server (SRS) 16.0 SP03 PL07
  • High Availability Disaster Recovery (HADR)


SAP Adaptive Server Enterprise 16.0 ; SAP NetWeaver 7.5


np__connect_cb, "maintenance token", MAINT TOKEN, 1601, user connections, 820657, CR820657, CR#820657, SEGV, sybnet__async_poll, SIGSEGV, fault, segfault, kisignal, stacktrace,  stack, registers, CtlibController, 821749, CR821748, CR#821748, SRS, HADR , KBA , BC-SYB-REP-SAP , Replication with SAP Suite / SAP BW , BC-DB-SYB , Business Suite on Adaptive Server Enterprise , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , BC-SYB-REP , Sybase Replication Server (standalone) , Bug Filed

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