9.5;tb (traceback), revision 9.5, 87/05/13
TB (TRACEBACK) -- Print traceback after a fault.
usage: tb [process_name | process_uid | unix_pid] [options]
FORMAT
TB [process_id] [options]
TB prints a traceback after a fault. The traceback lists the names of the
routines leading from the fault back to the main program, and includes the
line number at which each routine was called. Up to 32 levels of calls can
appear. If the sequence exceeds 32 calls, the first 16 and last 16 are shown
in the traceback.
NOTE: There is a homonymous DM command: TB -- To bottom of window. Type
HELP TB_DM for details about that command.
ARGUMENTS
process_id
(optional) Specify the ID of the process for which the traceback is
desired. This may be the process name (displayed by the PST
(PROCESS_STATUS) command), the process UID, or the UNIX PID
(from PST -UN).
Default if omitted: perform traceback for the current
process.
OPTIONS
The following options are meaningful only when used for cross-process
tracebacks (i.e., tracing faults in some processes other than the current
one).
-ARGS Print the arguments to each call mentioned in the
traceback. NOTE: At SR9.5, this option functions only for
Pascal and FORTRAN calls. It does not report arguments for
C calls.
-A[LL_FRAMES]
Print all frames back to the root of the stack (i.e.,
through the current program and any calling programs)
rather than stopping at the current program level.
-R[EPEAT] [n]
Repeat the traceback every 'n' seconds. Repeat every 5
seconds if 'n' is omitted.
-T[ASK] Perform traceback for all the tasks running in the
specified process.
EXAMPLES
1. In the following example, an overflow error occurred in a
floating-point multiplication at line 25 of the routine named
EXTRAPOLATE. The routine EXTRAPOLATE was called at line 192 of the
routine REFLECTION, which in turn was called at line 19 of the main
program.
$ tb
overflow in multiply (from library/floating point)
In routine "EXTRAPOLATE" line 25
Called from "REFLECTION" line 192
Called from "$MAIN" line 19
$
2. Trace a fault in the process named 'mail', showing call arguments.
$ tb mail -args
In System Service "ec2_$wait"
Arguments unavailable
Called from "INPAD_$GET" line 152
1. 00938A66 -> 00938ABC ....
2. 00A53A1C -> 00000000 ....
3. 00987664 -> 20750A2D u.-
4. 000125B0 -> 000003E8 ....
5. 0003907C -> 00000000 ....
Called from "STREAM_$GET_REC" line 149
1. 00987AA0 -> 00000001 ....
2. 00987650 -> 00987664 ..vd
3. 000125B0 -> 000003E8 ....
4. 00987A4C -> 00987A70 ..zp
5. 00987A50 -> 000390E8 ....
6. 00987A54 -> 00987638 ..v8
7. 0003907C -> 00000000 ....
Called from "GET_COMMAND" line 1754
1. 00987AA0 -> 00000001 ....
2. 00987AA2 -> 00010002 ....
3. 00039010 -> 3A000000 :...
4. 000397DA -> 00010000 ....
5. 000390E8 -> 0092576E ..Wn
6. 0003907C -> 00000000 ....
Called from "EXEC_STREAM" line 2413
1. 0000
2. 0001
3. 0002
4. 0003
5. 0003907C -> 00000000 ....
Called from "MAIL" line 3146
Arguments unavailable
$
3. Trace a fault in the process named 'mail' as far down the stack as
possible.
$ tb mail -a
In System Service "ec2_$wait"
Called from "INPAD_$GET" line 152
Called from "STREAM_$GET_REC" line 149
Called from "GET_COMMAND" line 1754
Called from "EXEC_STREAM" line 2413
Called from "MAIL" line 3146
Called from "<Invoke Interlude>"
Called from "PGM_$LOAD_RUN" line 451
Called from "PGM_$INVOKE_UID_S" line 634
Called from "PGM_$INVOKE_UID" line 214
Called from "PM_$INIT" line 725
$
4. Trace a fault in a process that is running tasks.
$ tb process_21 -task
"distinguished_task"
(waiting)
In "STACK FILE" offset 469A0
Called from "task_$ec2_wait" line 1172
Called from "EC2_$WAIT_SVC" line 156
Called from "EC2_$WAIT" line 169
Called from "MAIN" line 179
Called from "SERVER" line 10
"reaper_task"
(active)
In System Service "ec2_$wait"
Called from "task_$ec2_wait" line 1172
Called from "EC2_$WAIT_SVC" line 156
Called from "EC2_$WAIT" line 169
Called from "task_$reaper_task" line 1986
Called from "task_$base_proc" line 675
Called from "/sys/node_data/global_readonly" offset 36F06
"TaskA1"
(waiting)
In "STACK FILE" offset 9A528
Called from "task_$ec2_wait" line 1172
Called from "EC2_$WAIT_SVC" line 156
Called from "EC2_$WAIT" line 169
Called from "GLARK" line 65
Called from "task_$base_proc" line 675
Called from "/sys/node_data/global_readonly" offset 36F06
"TaskB22"
(waiting)
In "STACK FILE" offset 9CD90
Called from "task_$ec2_wait" line 1172
Called from "EC2_$WAIT_SVC" line 156
Called from "EC2_$WAIT" line 169
Called from "GLARK" line 65
Called from "task_$base_proc" line 675
Called from "/sys/node_data/global_readonly" offset 36F06
"TaskC333"
(waiting)
In "STACK FILE" offset 9F5FC
Called from "task_$ec2_wait" line 1172
Called from "EC2_$WAIT_SVC" line 156
Called from "EC2_$WAIT" line 169
Called from "GLARK" line 65
Called from "task_$base_proc" line 675
Called from "/sys/node_data/global_readonly" offset 36F06
$