El respaldo del servidor Sybase a través de NetWorker/NMDA falla con errores de I/O que terminan con el bloqueo del proceso Sybmultbuf

• El respaldo de Sybase del módulo de NetWorker para aplicaciones de base de datos (NMDA) falla
• nsrdasv registró estos errores:

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 cuando la API de NMDA está realizando algún cifrado mediante 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)

Solución alternativa: 

Cargue previamente la biblioteca libcrypto.so.1.0.0 de NMDA en el script RUN del servidor de respaldo de Sybase. Reinicie el servidor de respaldo de Sybase,
 

1. En el cliente Sybase, inicie sesión como usuario de Sybase.
2. Vaya al directorio principal de instalación de Sybase
3. Obtenga el script del entorno Sybase.

$ . ./SYBASE.sh

4. Exporte la variable LD_PRELOAD en el script RUN. Guarde los cambios.

$ 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.  Reinicie el servidor de respaldo de 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