Hi all,

HP C3600 crashes frequently .
HP-UX hp-1 B.10.20 A 9000/785 2000429216 two-user license

What does "vmunix: ISC is NULL" mean? Is it root cause for crash?

Thanks.
Case

OLDsyslog.log shown as below:

Apr 20 13:15:57 hp-1 vmunix: ISC is NULL
Apr 20 13:19:57 hp-1 vmunix: ISC is NULL
Apr 20 13:21:57 hp-1 vmunix: ISC is NULL
Apr 20 13:23:55 hp-1 syslog: su : - 7 test1-root
Apr 20 13:25:19 hp-1 last message repeated 4 times
Apr 20 13:27:57 hp-1 vmunix: ISC is NULL
Apr 20 13:47:57 hp-1 vmunix: ISC is NULL
Apr 20 14:23:57 hp-1 vmunix: ISC is NULL
Apr 20 17:01:58 hp-1 vmunix: ISC is NULL
Apr 20 17:03:58 hp-1 vmunix: ISC is NULL
Apr 20 17:35:58 hp-1 vmunix: ISC is NULL
Apr 20 17:49:58 hp-1 vmunix: ISC is NULL
Apr 20 18:07:58 hp-1 vmunix: ISC is NULL
Apr 21 07:32:02 hp-1 vmunix: ISC is NULL
Apr 21 09:21:19 hp-1 /usr/dt/bin/rpc.ttdbserver[1420]:
_Tt_db_server_db("/"): 4 (/TT_DB/access_table)
Apr 21 09:21:20 hp-1 last message repeated 11 times
Apr 21 09:57:43 hp-1 /usr/dt/bin/rpc.ttdbserver[1420]:
_Tt_db_server_db("/"): 4 (/TT_DB/access_table)
Apr 21 09:57:44 hp-1 last message repeated 11 times
Apr 21 10:10:52 hp-1 syslog: libtt[14565]: _Tt_rpc_client::init():
fcntl(F_SETFD): m
Apr 21 10:10:52 hp-1 syslog: libtt[17511]: _Tt_rpc_client::init():
fcntl(F_SETFD): m
Apr 21 10:10:52 hp-1 syslog: libtt[18998]: _Tt_rpc_client::init():
fcntl(F_SETFD): m
Apr 21 10:10:52 hp-1 syslog: libtt[20920]: _Tt_rpc_client::init():
fcntl(F_SETFD): m
Apr 21 10:10:52 hp-1 syslog: libtt[14565]: ttdt_Xt_input_handler():
tttk_message_receive(): TT_ERR_NOMP^INo ttsession process is running,
probably because tt_open() has not been called yet. If this code is returned
from tt_open() it means ttsession could not be started, which generally
means ToolTalk is not installed on this system.
Apr 21 10:10:52 hp-1 syslog: libtt[17511]: ttdt_Xt_input_handler():
tttk_message_receive(): TT_ERR_NOMP^INo ttsession process is running,
probably because tt_open() has not been called yet. If this code is returned
from tt_open() it means ttsession could not be started, which generally
means ToolTalk is not installed on this system.
Apr 21 10:11:00 hp-1 /usr/dt/bin/rpc.ttdbserver[1420]:
_Tt_db_server_db("/"): 4 (/TT_DB/access_table)
Apr 21 10:11:01 hp-1 last message repeated 11 times
Apr 21 10:12:03 hp-1 vmunix: ISC is NULL
Apr 21 10:42:03 hp-1 vmunix: ISC is NULL
Apr 21 11:17:59 hp-1 syslog: libtt[21639]: _Tt_rpc_client::init():
fcntl(F_SETFD): m
Apr 21 11:17:59 hp-1 syslog: libtt[21639]: ttdt_Xt_input_handler():
tttk_message_receive(): TT_ERR_NOMP^INo ttsession process is running,
probably because tt_open() has not been called yet. If this code is returned
from tt_open() it means ttsession could not be started, which generally
means ToolTalk is not installed on this system.
Apr 21 11:17:59 hp-1 syslog: libtt[21640]: _Tt_rpc_client::init():
fcntl(F_SETFD): m
Apr 21 11:17:59 hp-1 syslog: libtt[21640]: ttdt_Xt_input_handler():
tttk_message_receive(): TT_ERR_NOMP^INo ttsession process is running,
probably because tt_open() has not been called yet. If this code is returned
from tt_open() it means ttsession could not be started, which generally
means ToolTalk is not installed on this system.
Apr 21 11:17:59 hp-1 syslog: libtt[22295]: _Tt_rpc_client::init():
fcntl(F_SETFD): m
Apr 21 11:17:59 hp-1 syslog: libtt[21691]: _Tt_rpc_client::init():
fcntl(F_SETFD): m
Apr 21 11:17:59 hp-1 syslog: libtt[21922]: _Tt_rpc_client::init():
fcntl(F_SETFD): m
Apr 21 11:52:26 hp-1 /usr/dt/bin/rpc.ttdbserver[1420]:
_Tt_db_server_db("/"): 4 (/TT_DB/access_table)
Apr 21 11:52:27 hp-1 last message repeated 11 times
Apr 21 11:54:04 hp-1 vmunix: ISC is NULL
Apr 21 12:58:04 hp-1 vmunix: ISC is NULL
Apr 21 13:00:04 hp-1 vmunix: ISC is NULL
Apr 21 13:04:04 hp-1 vmunix: ISC is NULL
Apr 21 13:15:48 hp-1 syslogd: going down on signal 15