2936802 - Error 715 , 707 and signal 11 at dpdb_free_dpm for failed dump - SAP ASE

• ASE and Backup Server logs show a number of interconnected errors
  
  
• ASE errors include 715, 707 and a signal 11 at address dpdb_free_dpm

2020/06/12 01:04:24.81 server Error: 715, Severity: 20, State: 2
2020/06/12 01:04:24.81 server Unable to locate a procedure cache memory control descriptor for memory '0x0x2ad5da4db000' in the global list.

Many more instances of error 715, followed by signal 11 at dpdb_free_dpm

2020/06/12 01:04:42.96 kernel Current process (0x2a310d5f) infected with signal 11 (SIGSEGV)
2020/06/12 01:04:42.96 kernel Address 0x0x0000000000afc3a1 (dpdb_free_dpm+0x1a5), siginfo (code, address) = (1, 0x0x0000000000047290)
...
SQL Text: dump database db1 to "sybackup:: -...SYB01"
kernel lasterror = 715 preverror

Followed by a stack trace including:

dpdb_free_dpm
dpdb_backout
dpdb_handle
dmpld_send_write_ht

• At the same time (01:04) Backup Server shows many instance of this error:

Jun 12 01:04:46 2020: D00: SYBMULTBUF ERROR: Emulator interprocess communication failed with error state = 9, error code=0, system message=Pipe I/O returned 0 bytes.
Jun 12 01:04:46 2020: Open Server Error: 16248.10.0: Error in srv_select() - file descriptor 81 is no longer active

• An hour later a similar pattern but with different error is seen for a dump on the same database. ASE log:

2020/06/12 02:04:41.64 server Error: 707, Severity: 20, State: 11
2020/06/12 02:04:41.64 server System error detected during attempt to free memory at address 0x2ada0cab5000. Please consult the ASE error log for more details.

Which matches to same Backup Server error as above:

Jun 12 02:04:51 2020: D00: SYBMULTBUF ERROR: Emulator interprocess communication failed with error state = 9, error code=0, system message=Pipe I/O returned 0 bytes.
Jun 12 02:04:51 2020: Open Server Error: 16248.10.0: Error in srv_select() - file descriptor 81 is no longer active

SAP Adaptive Server Enterprise (ASE) 16.0

KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Bug Filed