3831746 - Signal 11 (SIGSEGV) in ct__api_async causes RepAgent thread to hang as zombie — SAP ASE HADR

• Primary SAP ASE server error log shows a Signal 11 (SIGSEGV) preceded by a CI Library send failure: 

kernel  (CI-Info) Message: 76053, Severity: 5 Producer of Stream '<db>' failed to send a message with 748-bytes.
server  RepAgent(4): Streaming replication stream CI Library error -1 with severity 2 and message
        'Producer of Stream '<db>' failed to send a message with <>-bytes.'
        Rep Agent detected error 3 with message 'Unknown' at line <> in file ra_ci_scanner.c.
 [...]

kernel  Address 0x0x0000000002076ffe (ct__api_async+0x2e), siginfo (code, address) = (1, 0x0x0000000000000098)
kernel  Current process (0x0) infected with signal 11 (SIGSEGV)
kernel  Current Process is running on a Non-Engine Thread
kernel  pc: nthrd_backtrace+0x39()
kernel  pc: kisignal+0x7d0()
kernel  pc: ct__api_async+0x2e()
kernel  pc: ct_close+0x228()
kernel  pc: _MSProdOCSClose+0x3a()
kernel  pc: MSOCSCloseProdReceiver+0x104()
kernel  pc: MSProdReceiver+0x4c2()
kernel  pc: MSStartProdReceiver+0x2a0()
kernel  end of stack trace
kernel  Streaming replication native thread received signal 11, replication is stopped

• RepAgent CI coordinator then waits indefinitely for a completion signal, leaving the RepAgent in a hung state.

• HADR environment using streaming replication (CI Library / RAT-CI).
• Adaptive Server Enterprise/16.0 SP04
• Replication Server 16.0 SP04

signal 11; SIGSEGV; RepAgent; zombie; ct__api_async; ct_close; , KBA , BC-SYB-REP , Sybase Replication Server (standalone) , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Problem