[cairo-bugs] [Bug 73580] cairo-perf-trace failure

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73580

Pekka Paalanen <ppaalanen at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ppaalanen at gmail.com

--- Comment #2 from Pekka Paalanen <ppaalanen at gmail.com> ---
That "invalid value" error is tormenting me too. All tracing attempts of
complicated applications (Midori, netsurf-gtk, epiphany-browser) end up either
in segfault during the tracing, or then the produced trace causes "invalid
value" when trying to replay it.

The only thing I managed to do, is to get a backtrace of when the error happens
during replay:

#0  0x00007ffff7bd0244 in _csi_error () from
/home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#1  0x00007ffff7bc5744 in _csi_ostack_get_context.3734 ()
   from /home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#2  0x00007ffff7bc56de in _do_cairo_op.3739 () from
/home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#3  0x00007ffff7bc0c8d in _reset_clip.3755 () from
/home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#4  0x00007ffff7bd1d58 in csi_object_execute () from
/home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#5  0x00007ffff7bce59c in _scan_execute.5675 () from
/home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#6  0x00007ffff7bc8482 in scan_execute.5474 () from
/home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#7  0x00007ffff7bcac32 in _scan_file.5693 () from
/home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#8  0x00007ffff7bd1eed in _csi_scan_file.2241 ()
   from /home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#9  0x00007ffff7bd1ddd in _csi_file_execute.2233 ()
   from /home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#10 0x00007ffff7bd1d8a in csi_object_execute () from
/home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#11 0x00007ffff7bc517f in cairo_script_interpreter_run ()
   from /home/pq/tmp/pixman-install/lib/libcairo-script-interpreter.so.2
#12 0x00000000004062a0 in cairo_perf_trace (perf=0x7fffffffdb50,
target=0x611cc0 <builtin_targets>, 
    trace=0x7fffffffe06a "./netsurf-load-madoka.trace") at
cairo-perf-trace.c:757
#13 0x0000000000406fbc in main (argc=3, argv=0x7fffffffdcf8) at
cairo-perf-trace.c:1032

And for whatever reason, libcairo-script-interpreter.so seems to never contain
debug information while libcairo.so does, but that's off-topic.

I do run the traces through csi-bind from the Cairo trace repositories, but
that doesn't help.

What can I do to investigate this?

Is there some other tool, that would verbosely tell, what it parses from the
trace, so that I might at least determine whether the trace itself is
corrupted, or if the script interpreter is broken?

I found DEBUG_SCAN in cairo-script-scanner.c, but it does not tell what the
operators are, and I couldn't figure out how to print what they are.

I have been recording and playing back on Raspberry Pi with Cairo 1.12.16. I
have managed to create one working trace from Leafpad. All the traces work or
do not work equally well on both RPi and x86_64.

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