01-03-2018
You have truss output for a failure. Please generate one for success on another machine.
Do you see the point in the truss output where the two diverge? i.e., problem one has an error return from a syscall, the other does not.
This has some assumptions that might be wrong, but it is worth a try.
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LEARN ABOUT FREEBSD
truss
TRUSS(1) BSD General Commands Manual TRUSS(1)
NAME
truss -- trace system calls
SYNOPSIS
truss [-facedDS] [-o file] [-s strsize] -p pid
truss [-facedDS] [-o file] [-s strsize] command [args]
DESCRIPTION
The truss utility traces the system calls called by the specified process or program. Output is to the specified output file, or standard
error by default. It does this by stopping and restarting the process being monitored via ptrace(2).
The options are as follows:
-f Trace descendants of the original traced process created by fork(2), vfork(2), etc.
-a Show the argument strings that are passed in each execve(2) system call.
-c Do not display individual system calls. Instead, before exiting, print a summary containing for each system call: the total system
time used, the number of times the call was invoked, and the number of times the call returned with an error.
-e Show the environment strings that are passed in each execve(2) system call.
-d Include timestamps in the output showing the time elapsed since the trace was started.
-D Include timestamps in the output showing the time elapsed since the last recorded event.
-S Do not display information about signals received by the process. (Normally, truss displays signal as well as system call events.)
-o file
Print the output to the specified file instead of standard error.
-s strsize
Display strings using at most strsize characters. If the buffer is larger, ``...'' will be displayed at the end of the string. The
default strsize is 32.
-p pid Follow the process specified by pid instead of a new command.
command [args]
Execute command and trace the system calls of it. (The -p and command options are mutually exclusive.)
EXAMPLES
# Follow the system calls used in echoing "hello"
$ truss /bin/echo hello
# Do the same, but put the output into a file
$ truss -o /tmp/truss.out /bin/echo hello
# Follow an already-running process
$ truss -p 34
SEE ALSO
kdump(1), ktrace(1), ptrace(2)
HISTORY
The truss command was written by Sean Eric Fagan for FreeBSD. It was modeled after similar commands available for System V Release 4 and
SunOS.
BSD
May 12, 2009 BSD