Il backup del server Sybase tramite NetWorker/NMDA ha esito negativo con errori di I/O che terminano con l'arresto anomalo del processo Sybase sybmultbuf

• Il backup di NetWorker Module for Database Applications (NMDA) Sybase ha esito negativo
• nsrdasv ha registrato questi errori:

24146:nsrdasv: Error from server SL4_BS: Msg 419402, Level 2, State 1
Backup Server: 4.194.2.1: Internal error. The srv_select() function was called to complete an I/O for 2240 bytes. After retrying 2241 times only 0 bytes have been read.24146:nsrdasv: Error from server SL4_BS: Msg 414102, Level 2, State 75
Backup Server: 4.141.2.75: [0] The 'read' call failed for database/archive device while working on stripe device 'nsrsyb::model..3.1./nsr/apps/tmp/sybtmp_1671421.txt::000' with error number 0 (Success). Refer to your operating system documentation for further details.24146:nsrdasv: Error from server SL4_BS: Msg 406203, Level 3, State 1
Backup Server Internal Error: 4.62.3.1: Multibuffering subprocesses died, archive nsrsyb::model..3.1./nsr/apps/tmp/sybtmp_1671421.txt::000.24146:nsrdasv: Error from server SL4_BS: Msg 414102, Level 2, State 66
Backup Server: 4.141.2.66: [0] The 'write' call failed for database/archive device while working on stripe device 'nsrsyb::model..3.1./nsr/apps/tmp/sybtmp_1671421.txt::000' with error number 32 (Broken pipe). Refer to your operating system documentation for further details.24146:nsrdasv: Error from server SL4_BS: Msg 406203, Level 3, State 8
Backup Server Internal Error: 4.62.3.8: Multibuffering subprocesses died, archive nsrsyb::model..3.1./nsr/apps/tmp/sybtmp_1671421.txt::000.24146:nsrdasv: Error from server SL4_BS: Msg 603102, Level 2, State 2
Backup Server: 6.31.2.2: Volume rejected.24146:nsrdasv: Error from server SL4_BS: Msg 101402, Level 2, State 2
Backup Server: 1.14.2.2: Unrecoverable I/O or volume error. This DUMP or LOAD session must exit.24146:nsrdasv: Error from server SL4_BS: Msg 414102, Level 2, State 66

• sybmultbuf quando l'API NMDA esegue la crittografia utilizzando Openssl:

 A00: SYBMULTBUF: bs_trap; process received signal 11
 A00: 0x7fc08ac64b20 : (killpg+0x40) [0x7fc08ac64b20]
 A00: 0x7fc0898fba79 : (EVP_MD_CTX_clear_flags+0x9) [0x7fc0898fba79]
 A00: 0x7fc0898e9461 : (EVP_DigestInit_ex+0x21) [0x7fc0898e9461]
 A00: 0x7fc08990af31 : (HMAC_Init_ex+0x211) [0x7fc08990af31]
 A00: 0x7fc088a1a219 : (comssl_OpenSSL_hmac_init+0x69) [0x7fc088a1a219]
 A00: 0x7fc0889ab8f9 : (cryptoiface_get_hmac+0x89) [0x7fc0889ab8f9]
 A00: 0x7fc0889ac1c5 : (gsslgtov1_export_sec_context+0x285) [0x7fc0889ac1c5]
 A00: 0x7fc0889af5b0 : (gsslgtov1_init_sec_context+0xe20) [0x7fc0889af5b0]
 A00: 0x7fc0889a1dbc : (authgss_create+0x5dc) [0x7fc0889a1dbc]
 A00: 0x7fc0889af6e0 : (gsslgtov1_init_sec_context+0xf50) [0x7fc0889af6e0]
 A00: 0x7fc0889b0553 : (gsslgtov1_acquire_cred+0xad3) [0x7fc0889b0553]
 A00: 0x7fc08898673c : (lgto_parms+0x127c) [0x7fc08898673c]
 A00: 0x7fc088987909 : (acquire_lg_authgen_cred_lsp_host_override+0x299) [0x7fc088987909]
 A00: 0x7fc088987b87 : (acquire_lg_authgen_cred+0x37) [0x7fc088987b87]
 A00: 0x7fc0889822ba : (rap_bind+0x41a) [0x7fc0889822ba]
 A00: 0x7fc088992f71 : (resdb_net_encrypt+0xd1) [0x7fc088992f71]
 A00: 0x7fc0888789d4 : (nsr_ladb_net+0xc4) [0x7fc0888789d4]
 A00: 0x7fc088878379 : (nsr_findserver+0x109) [0x7fc088878379]
 A00: 0x7fc0887ad5b3 : (_nwbsa_open_options_session+0x243) [0x7fc0887ad5b3]
 A00: 0x7fc08879d145 : (BSAInit+0x275) [0x7fc08879d145]
 A00: 0x7fc08879b273 : (init_bsa+0x33) [0x7fc08879b273]
 A00: 0x7fc088797e1e : (syb_open+0xa8e) [0x7fc088797e1e]
 A00: 0x44d691 : (api_open+0x501) [0x44d691]
 A00: 0x42924f : (ctl_job+0x249) [0x42924f]
 A00: 0x425fe8 : (archive_proc+0x593) [0x425fe8]
 A00: 0x42526a : (sybmbuf_main+0x66e) [0x42526a]
 A00: 0x424bfa : (main+0x1b) [0x424bfa]
 A00: 0x7fc08ac50cf3 : (__libc_start_main+0xf3) [0x7fc08ac50cf3]
 A00: 0x424b09 : (_start+0x29) [0x424b09]
 D00: SYBMULTBUF ERROR: Emulator interprocess communication failed with error state = 9, error code=0, system message=Pipe I/O returned 0 bytes.
 Open Server Error: 16248.10.0: Error in srv_select() - file descriptor 12 is no longer active
 Backup Server: 4.194.2.1: Internal error. The srv_select() function was called to complete an I/O for 2240 bytes. After retrying 2241 times only 0 bytes have been read.
 Backup Server: 4.141.2.75: [0] The 'read' call failed for database/archive device while working on stripe device 'nsrsyb::...1::000' with error number 0 (Success). Refer to your operating system documentation for further details.
 Backup Server Internal Error: 4.62.3.1: Multibuffering subprocesses died, archive nsrsyb::...1::000.
 Backup Server: 4.141.2.66: [0] The 'write' call failed for database/archive device while working on stripe device 'nsrsyb::...1::000' with error number 32 (Broken pipe). Refer to your operating system documentation for further details.
 Backup Server Internal Error: 4.62.3.8: Multibuffering subprocesses died, archive nsrsyb::...1::000.
.....
Jul 6 20:23:36 2022: D02: SYBMULTBUF ERROR: Emulator interprocess communication failed with error state = 9, error code=0, system message=Pipe I/O returned 0 bytes.
Jul 6 20:23:36 2022: Open Server Error: 16248.10.0: Error in srv_select() - file descriptor 17 is no longer active
Jul 6 20:23:36 2022: Open Server Error: 16248.10.0: Error in srv_select() - file descriptor 17 is no longer active

$ ldd ./backupserver
        linux-vdso.so.1 (0x00007ffe6d6db000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007faea79ab000)
        librt.so.1 => /lib64/librt.so.1 (0x00007faea77a3000)
        libm.so.6 => /lib64/libm.so.6 (0x00007faea7421000)
        libnsl.so.1 => /lib64/libnsl.so.1 (0x00007faea7207000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007faea6fe7000)
        libc.so.6 => /lib64/libc.so.6 (0x00007faea6c22000)
        /lib64/ld-linux-x86-64.so.2 (0x00007faea7baf000)
        libtirpc.so.3 => /lib64/libtirpc.so.3 (0x00007faea69ef000)
        libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007faea679a000)
        libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007faea64b0000)
        libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007faea6299000)
        libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007faea6095000)
        libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007faea5e84000)
        libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007faea5c80000)
        libcrypto.so.1.1 => /lib64/libcrypto.so.1.1 (0x00007faea5797000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x00007faea5580000)
        libselinux.so.1 => /lib64/libselinux.so.1 (0x00007faea5356000)
        libz.so.1 => /lib64/libz.so.1 (0x00007faea513e000)
        libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007faea4eba000)

Soluzione alternativa: 

Precaricare la libreria NMDA libcrypto.so.1.0.0 nello script RUN del backup server Sybase. Riavviare il backup server Sybase,
 

1. Sul client Sybase, accedere come utente Sybase.
2. Passare alla directory principale di installazione di Sybase
3. Generare lo script dell'ambiente Sybase.

$ . ./SYBASE.sh

4. Esportare la variabile LD_PRELOAD nello script RUN. Salvare le modifiche.

$ cd $SYBASE/$SYBASE_ASE/install
$ vi RUN_<SERVER>_BS
# Multibuf executable path:     /home/sybase16sp4/ASE-16_0/bin/sybmultbuf
# Backup Server name:   DELLSP4_BS
#
LD_PRELOAD=/usr/lib/nsr/apps/lib64/libcrypto.so.1.0.0
export LD_PRELOAD
/home/sybase16sp4/ASE-16_0/bin/backupserver \
-e/home/sybase16sp4/ASE-16_0/install/DELLSP4_BS.log \
-N25 \

5.  Riavviare il backup server Sybase.

$ cd $SYBASE/$SYBASE_OCS/bin
$ Isql -U<user> -P<Password> -S<Sybase Server>
Isql> shutdown SYB_BACKUP
Isql> quit

$ cd $SYBASE/$SYBASE_ASE/install
$ startserver -f RUN_<Sybase server>_BS

$ ./showserver