SnappyFile::rawWrite Segfault

[Kain Osterholt]

Hi all,

I have recently encountered an issue both in apitrace 3.0 and the tip of
the source as of last friday.  I get a segmentation fault in the trace
writer in SnappyFile::rawWrite.  From the backtrace it looks like this
originates from a glDrawElements call.  I am attaching the partial stack
here.  I still haven't figured out what the difference in this particular
DrawElements call is to cause the issue.  The same rendering pipeline is
traced fine for another game I am working on so it seems that there is some
specific feature or mesh that isn't playing nicely with the writer.  Can
anyone provide any insight in debugging such an issue?  I'm new to apitrace
so any help in understanding how to report such issues better in the future
would be welcome as well.

Program terminated with signal 11, Segmentation fault.
#0  0x40fd86af in ?? () from /lib/i386-linux-gnu/libc.so.6
(gdb) bt
#0  0x40fd86af in ?? () from /lib/i386-linux-gnu/libc.so.6
#1  0x4018d7a2 in SnappyFile::rawWrite (this=0xacd3e08, buffer=0xbfa98ba0,
length=21960)
    at /usr/include/i386-linux-gnu/bits/string3.h:52
#2  0x40189408 in write (this=<optimized out>, length=21960,
buffer=0xbfa98ba0) at /apitrace/common/trace_file.hpp:119
#3  _write (dwBytesToWrite=21960, sBuffer=0xbfa98ba0, this=<optimized out>)
at /apitrace/common/trace_writer.cpp:82
#4  trace::Writer::writeBlob (this=0x401fdec0, data=0xbfa98ba0, size=21960)
at /apitrace/common/trace_writer.cpp:262
#5  0x40165e4e in _trace_user_arrays (count=2745) at
/apitrace/build/wrappers/glxtrace.cpp:82774
#6  0x4016cc8b in glDrawElements (mode=4, count=3600, type=5123,
indices=0x0)
    at /apitrace/build/wrappers/glxtrace.cpp:2288
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